monaco carre dor apartment renovation — monaco

Monaco's Carré d'Or bans exterior alteration absolutely. Inside your four walls, you own a 250-year-old blank canvas.

---

Most of what is written about renovating in Monaco is either wrong or hedged to the point of uselessness. Owners are told the Carré d'Or is "restricted" without being told where the restriction actually stops. They are told permits take "a long time" without being told that interior works review in eight to sixteen weeks and that the real delay sits in the parallel SMEG dossier and the copropriété AG calendar, neither of which the DPU controls. They are told French contractors "might" be allowed without being told that sixty to seventy percent of Monaco's renovation volume is already executed by Nice and Beausoleil based entreprises générales working under a declaration de détachement that has been routine since the 2007 copropriété reform. What follows is the Carré d'Or as it is actually regulated in 2026, as Monaco's DPU actually reviews it, and as Baily's Monaco partner architects and general contractors actually execute it. This is written for owners who are spending between three and twenty million euros on an interior, and who do not have time for a lead auction.

What the Carré d'Or actually is

The Carré d'Or — the Golden Square — is a defined geography, not a marketing phrase. The quadrangle is bounded by Avenue de Monte-Carlo to the south, Avenue des Beaux-Arts to the east, Avenue Princesse Grace along the eastern seafront, and Avenue d'Ostende to the west. The Casino gardens and Place du Casino sit at its center. The buildings facing directly onto those four avenues, and a handful of secondary streets inside the quadrangle — Avenue Saint-Michel, Avenue Henry Dunant, Boulevard des Moulins where it closes the square to the north — make up the Carré d'Or proper. Every building on this footprint is subject to façade preservation under the DPU's zoning map, regardless of its construction date.

The building stock inside the square is more heterogeneous than outsiders assume. A substantial share is Belle Époque, built between roughly 1880 and 1920 during Monaco's first tourism boom — these are the stuccoed facades with balustrades, consoles, and figurative sculpture that give the quarter its character. A second wave of building replaced about thirty percent of the original Belle Époque fabric during Monaco's 1970s densification, and these mid-century towers — the Mirabeau, the Roccabella, the Houston Palace — sit inside the Carré d'Or under the same façade-preservation regime as their nineteenth-century neighbors. A third, smaller wave of selective post-2000 demolition and rebuild has produced a handful of steel-and-glass towers on the seafront where façade preservation was negotiated down to volumetric rules rather than literal historic matching. The Tour Odéon, though just outside the Carré d'Or line, is the canonical example of what a post-2000 Monaco permit permits — and what it does not.

Pricing inside the square is the highest in the world on a per-square-meter basis. The Knight Frank Wealth Report puts Monaco's prime residential at roughly fifty-two thousand euros per square meter average for 2024, with Carré d'Or transactions routinely crossing one hundred thousand euros per square meter and the highest trades — a handful of penthouses in the Park Palace and the Mirabeau — documented above one hundred and twenty thousand per square meter. That pricing reflects land scarcity inside a two-square-kilometer principality and the preservation of view corridors, not the age or condition of the building. It is normal for an apartment priced at a hundred thousand euros per square meter to require a gut renovation on acquisition.

Exterior façade freeze — what DPU will and will not approve

The DPU will not approve exterior alteration that changes the perceived silhouette, rhythm, material, or color of a Carré d'Or façade. That rule has effectively zero exceptions. Where it bites, in practical terms, is in six places.

Windows. Original wood windows with specific profile geometries — French casement with vertical mullions, divided lites on pre-1920 stock, full-height balcony doors with rectangular or lyre-pattern balustrades — must be replaced in kind. DPU requires joinery sample submissions before permit, and will refuse PVC outright regardless of visual match. Historically compatible wood joinery from specialist French Riviera menuisiers — Loison, Millet, or the Atelier Bois in Vallauris — runs twelve to thirty-five thousand euros per window, with a ten to fourteen week lead time. Double-glazing is now permitted inside the original profile if the sightline match is documented, which was a policy shift the DPU confirmed in its 2021 guidance note; triple glazing is permitted on seaward-facing units where the original profile can accommodate it.

Balcony railings. Cast iron with figurative or geometric motifs on Belle Époque balustrades must be conserved and restored, not replaced. Mid-century towers have steel or aluminum balustrades that may be refinished but not re-profiled. Glass balustrades are categorically refused on Belle Époque stock and case-by-case on mid-century towers.

Air conditioning. This is where most first-time Monaco renovators break their own project timeline. Visible outdoor condensers are categorically refused in the Carré d'Or — on balconies, on terraces, on facades, on roofs where visible from any public vantage. The only permitted path is a variable refrigerant flow system with the outdoor unit concealed in a service shaft, a rooftop plant room, or a below-grade technical level, then routed via refrigerant piping to concealed indoor units with linear slot diffusers or cassette plenums. This adds forty to one hundred and twenty thousand euros versus a conventional split system on a two hundred square meter apartment, depending on whether the building has a pre-existing service shaft capacity or requires a riser negotiation with the copropriété. Daikin, Mitsubishi, and Hitachi all offer VRF systems that the Monaco electrical engineering offices — Berim, Etec, and Cabinet Naldi — have specified repeatedly for DPU permits.

Satellite dishes and antennas. Refused absolutely on facades, balconies, and visible roof positions. Concealed IPTV or cable-fed installations are the only path. Yacht-owning residents who need Ku-band reception for private feeds typically install a concealed rooftop dome under a architectural penthouse housing, requiring a DPU permit for the housing itself.

Exterior shading. Retractable awnings with fabric matched to DPU-approved palette ranges are permitted on some balconies; fixed exterior shading, louvered shutters where none existed historically, or pergola structures that change the façade silhouette are refused. Electrochromic or frit glazing inside the existing window profile is an emerging path the DPU has approved on three Carré d'Or projects in the 2022-2024 window.

Loggia glazing and rooftop terrace envelopes. This is the most actively contested category under DPU review since 2022. Historically, infilling an open loggia with glazing was denied by default. Under pressure from Carré d'Or owners seeking to create all-season terraces, the DPU has approved a handful of frameless structural-glass infills where the glazing sits behind the original column line and is not perceived from street vantage. Most applications are still denied. Rooftop terrace glass balustrades are under active review — the DPU accepted two applications in 2023 with strict sightline analysis, and is understood to be developing a formal guidance note.

None of this applies to the interior of the apartment.

The 90%+ rule — interior latitude is enormous

Inside the four walls of a Carré d'Or apartment, an owner's latitude is effectively that of any high-specification renovation anywhere in Europe, with four technical constraints. First, the walls you think are load-bearing often are not. Monte-Carlo mid-century tower stock (the Mirabeau, the Park Palace, the Houston Palace, the Roccabella) is overwhelmingly post-and-slab construction with non-load-bearing partitions inside units — structural engineers routinely certify entire floor plates as reconfigurable without steel. Belle Époque buildings are masonry with load-bearing cross-walls at twenty to twenty-five meter intervals, which sounds restrictive until you recognize that most Belle Époque units already fit inside a single structural bay. Second, ceiling heights are generous by contemporary standards — three point two to four meters is typical — which gives you genuine stud-bulkhead depth for concealed mechanical, electrical, plumbing, fire-suppression, and VRF distribution without compromising finished ceiling heights below two point seven meters. Third, parquet Versailles, plaster moulures, and original cheminées in Belle Époque stock may be classified at the individual unit level; this is verified at permit time via the DPU's inventory of éléments intérieurs protégés. Classified elements must be conserved in place or restored; unclassified decorative elements may be removed at the owner's discretion. Fourth, wet zones (bathrooms, kitchens, laundry) can be repositioned anywhere on the floor plate provided drainage slope falls back to the original riser positions, and provided the copropriété's water and waste risers have capacity. Riser capacity is verified by the building syndic early in design.

A worked example: a 240 square meter combination of two adjacent three-bedroom Carré d'Or apartments into a single four-bedroom family residence, executed in 2024 on the Avenue de Monte-Carlo. The owner bought both units vacant, total acquisition twenty-two million euros. Scope: removal of the party wall on the floor plate (two thirds AG vote secured, six weeks), full strip of both units to the structural slab, reconfiguration to a single four-bedroom floor plan with a cinema and a wine room, replacement of both bathrooms and the single retained kitchen, integration of VRF through a rooftop concealed condenser position negotiated with the copropriété, and full electrical upgrade to triphasé with SMEG riser replacement. Architect: Humbert & Poyet inscrits à l'Ordre de Monaco. General contractor: a Beausoleil-based entreprise générale operating under détachement, with a Monégasque entreprise as the contractual front for invoicing. Budget: two point eight million euros all-in (twelve thousand euros per square meter). Timeline from design start to réception: eighteen months. DPU permit elapsed time: eleven weeks. SMEG dossier elapsed time: fourteen weeks filed in parallel. Copropriété AG approval: six weeks from syndic convocation. Actual site execution: ten months once permits cleared.

That project is representative. Most Carré d'Or gut renovations cluster in the ten to twenty thousand euros per square meter range, run eighteen to thirty months elapsed, and involve one to two hundred square meters of floor plate. The outliers — the penthouses at twenty-plus million euros with marine spa fit-outs — run thirty-five to fifty thousand euros per square meter and thirty-six to forty-eight months elapsed.

The DPU permit path — 8 to 16 weeks for interior works

The demande d'autorisation de travaux is filed by the architect, not the owner and not the general contractor. This is a legal requirement: the applicant of record must either be the legal owner or a mandated representative of the legal owner, and the technical dossier must be stamped by an architect inscrit à l'Ordre — the Monégasque Ordre for Monaco-domiciled architects, or the French Ordre with reciprocal inscription for Nice and Beausoleil-based practices. Several of Monaco's most active interior architects — Humbert & Poyet, Federico Delrosso Monaco, Claudio Hürzeler — hold both inscriptions.

The dossier contains: existing state plans and elevations, proposed state plans and elevations, a notice descriptive detailing all scope, structural calculations where any wall is removed, a fire-safety notice, an acoustic notice if applicable, a copropriété approval letter if works affect parties communes, and the SMEG coordination note if the electrical or gas scope requires a meter upgrade. For pre-1975 buildings, an asbestos survey and a lead-paint survey are mandatory and must be attached to the dossier — these add two to four weeks of pre-filing work and, where positive results require abatement, five to ten weeks on the backend.

DPU review typically runs eight to twelve weeks for straightforward interior works on post-1975 buildings. Sixteen weeks is the upper bound for pre-1975 Belle Époque work, driven by the DPU's consultation with the Commission des Sites et Monuments where interior classified elements are involved. Façade-adjacent interior work — if the interior window scope changes the external profile, glass tint, or mullion pattern visible from the exterior — pushes to twenty-four to forty-eight weeks because it triggers a parallel façade review.

Rejection is rare for interior-only work where the dossier is complete and the architect has pre-consulted. The DPU runs a pre-filing consultation system — a rendez-vous with the relevant reviewer before the dossier is formally filed — that catches ninety percent of the issues that would otherwise produce a rejection. Architects who skip the pre-consultation trade a one-hour meeting for a two-to-four-month resubmission cycle. Baily's Monaco partner architects all run pre-consultation as standard.

Assurance décennale — the single strongest trust filter

Every contractor executing construction in Monaco must carry assurance décennale. This is the French ten-year structural warranty under Code Civil Article 1792, which applies in Monaco via bilateral alignment between the two legal systems. What matters for an owner is not that the contractor claims to carry décennale — every contractor claims this — but that the contractor's attestation is current, names the specific Monaco address where the works will be executed, covers a period that begins before the works start and runs past réception, and is accompanied by attestations from every subcontractor performing works that fall under décennale scope.

The last point is where most of the risk sits. Décennale follows the person executing the work, not the main contract. A general contractor can be fully insured and still expose the owner to a décennale gap if the subcontractor installing the plumbing, the waterproofing, the electrical, or the structural glass has let their décennale lapse. Large entreprises générales carry umbrella policies that extend to their regular subcontractors; smaller GCs do not. Baily verifies the main GC's décennale attestation and samples three to five subcontractor attestations (typically plumbing, electrical, waterproofing, and the structural trade) before match confirmation.

Monaco décennale premiums run twenty to forty percent higher than mainland France. The reason is simple: claim values track construction values, and Monaco construction values per square meter are the highest in Europe. A waterproofing failure on a two hundred square meter Carré d'Or apartment can trigger claims of two to five million euros; the same failure in Nice triggers claims of three hundred to eight hundred thousand euros. Insurers price accordingly. MMA, AXA, Allianz, and the specialty lines at Hiscox France all underwrite Monaco décennale. A general contractor who shows you an attestation from a non-standard carrier — or an attestation that excludes Monaco as a covered territory — is disqualifying.

SMEG coordination — file in week one or lose two months

SMEG, the Société Monégasque de l'Électricité et du Gaz, holds the monopoly on electricity, gas, and water delivery in Monaco. Any renovation that changes the unit's electrical load class, converts from single-phase to triphasé, modifies gas line routing, swaps gas cooking for induction with the electrical uplift that implies, or relocates a meter requires a SMEG dossier filed in parallel with the DPU permit. SMEG is slow, and SMEG is not optional.

Typical upgrade paths on a Carré d'Or gut renovation: triphasé conversion if the unit is still on single-phase (most pre-1990 Belle Époque and early mid-century stock), power uplift from twelve kVA to thirty or forty-five kVA to support VRF, induction cooking, and whole-unit electrical loads, gas decommissioning where owners are converting fully to electric, and meter relocation where the original meter position conflicts with the new plan. SMEG review for straightforward power uplift runs six to ten weeks. Where the building's main electrical riser needs replacement to support the uplift — common in Belle Époque stock where the original riser was sized for lighting only — the review runs twelve to twenty weeks and requires copropriété AG approval of the riser work.

General contractors who file the SMEG dossier in week ten or week twelve of the project, alongside or after DPU permit grant, routinely cost the owner two to three months at the back end because the site cannot energize. Baily's Monaco partner GCs all file SMEG in parallel with DPU. If the GC you are speaking with treats SMEG as a post-permit task, that is a signal.

French Riviera GC coordination

Between sixty and seventy percent of Monaco renovation volume on existing building stock is executed by general contractors domiciled in Nice, Beausoleil, Roquebrune-Cap-Martin, or Cap-d'Ail. This is not a workaround; it is the structural reality of a two-square-kilometer principality where there is not room for a full domestic GC industry at Monaco's renovation volumes. Monaco and France operate a formal customs and labor union under the 1963 treaty, and the déclaration de détachement regime makes cross-border execution straightforward for contractors who understand it.

The déclaration de détachement is filed by the French entreprise with Monaco's Direction du Travail before works start, lists the workers who will cross the border, names the Monaco site address, and specifies the duration. It is the legal basis for French workers executing construction on Monégasque soil while remaining under French social security and French employment law. Renewal is on a per-project basis. GCs who routinely work in Monaco — the Beausoleil-based Bouygues Monaco partner entities, the Nice-based Eiffage Côte d'Azur, and a handful of independents — file detachement as operational routine.

The TVA and invoicing chain is where the friction lives. Monaco applies a twenty percent TVA identical to France via the customs union, which sounds simple and is not. A French GC invoicing from a French SIRET for Monaco works must handle the TVA correctly on both sides of the border — TVA is due in Monaco, reclaimable in France through the intra-union settlement, but the paperwork must be structured from the first invoice. A badly constructed invoicing chain on a one million euro renovation can strand two hundred thousand euros of TVA between the two administrations, recoverable only through a formal rectification that takes six to eighteen months. Owners executing renovations above a million euros should require that their GC either operate through a Monégasque succursale or partner with a Monaco-registered entreprise as the contractual front, with the French entreprise as sub. Baily's partner structure uses this model by default.

Where the Nice-based GC advantage bites: depth of labor market, specialty trades, and cost structure. Monaco wages for construction labor run fifteen to twenty-five percent above Nice; specialty trades — stone, gilding, ebony joinery, structural glass — are effectively unavailable inside Monaco and sourced from Grasse, Vence, Biot, and Vallauris. A Beausoleil GC with a twenty-year book of Monaco work knows every specialist in the region.

UHNW ownership structure considerations

Carré d'Or apartments are rarely held in a single natural person's name. The typical structures: a Monégasque SCI (société civile immobilière), a Luxembourg SOPARFI holding a Monaco SCI, a Guernsey or Jersey trust holding directly, a BVI or Cayman company for ultimate tax-domicile reasons, or a French SCI where the owner is a French tax resident. Each of these has an operational consequence at permit time.

The DPU's autorisation de travaux applicant field requires the legal owner or a mandated representative. Where the owner is an SCI, the gérant signs or provides a mandate. Where the owner is a trust, the trustee signs or provides a mandate. Where the owner is an offshore company, the company's mandated representative in France or Monaco signs — which in practice means the Monaco or Nice-based notaire handling the acquisition and ongoing administration. A mandate that does not match the structure on the cadastre, or that was signed by a predecessor gérant whose powers have since lapsed, delays the permit six to twelve weeks until the architect refiles with a corrected mandate.

This is not theoretical. Baily has seen three Carré d'Or permit delays of exactly this shape in the 2023-2024 window, each running ten to sixteen weeks past an otherwise clean dossier. The fix is sequencing: before the architect files, the Monaco or Nice-based notaire who handled the acquisition issues a fresh mandate-certificate confirming the current signing authority, attaches the structure diagram, and clears it with the architect. That sequence — notaire, then architect, then DPU — takes one week of calendar time and saves a quarter of elapsed permit time in the cases where it matters. Baily routes Carré d'Or owners through this sequence by default.

Typical 18-month Carré d'Or gut-reno timeline

This is the median timeline for a two hundred to three hundred square meter Carré d'Or gut renovation with full MEP replacement, assuming a clean ownership structure, no extensive copropriété objections, and no façade-adjacent interior work. Faster timelines (twelve to fourteen months) are achievable on smaller apartments with simpler scopes; slower (twenty-four to thirty months) are typical on combinations, penthouses with rooftop work, or projects with asbestos abatement.

Months 1 to 2. Architect selected, feasibility study, scope development, and preliminary DPU pre-consultation. Notaire mandate refresh if ownership structure requires it. Initial copropriété engagement via syndic.

Months 3 to 4. Detailed design, technical dossier assembly, asbestos and lead surveys on pre-1975 buildings, SMEG pre-dossier. DPU dossier filed at the end of month 3. SMEG dossier filed in parallel.

Month 5. DPU review continues. Copropriété AG convened if structural or façade works require vote; 2/3 tantièmes approval for structural, unanimité for façade.

Months 6 to 7. Permits granted. Contractor mobilization, site installation, protection of classified interior elements, initial strip-out.

Months 8 to 12. Gros œuvre — structural modifications, waterproofing, MEP rough-ins, VRF distribution, first-fix electrical and plumbing. This is the longest single phase and the most likely to run over on unexpected scope.

Months 13 to 16. Second œuvre — finishes, plaster, flooring including parquet restoration or replacement, joinery install, kitchen install, bathroom finishes, wall finishes, lighting.

Months 17 to 18. FF&E coordination, snagging, réception with the architect, décennale activation, copropriété sign-off, owner handover. Owners who have not coordinated FF&E in parallel with second œuvre typically add two to three months at this stage.

Why Baily surfaces 2-3 matched architects and GCs per inquiry

Monaco is a concierge market. An owner spending three to twenty million euros on an interior has already been told by their private banker, their notaire, or their real estate agent that "everyone uses the same four firms." That is roughly true and operationally insufficient. The four firms everyone names — Humbert & Poyet, Federico Delrosso, Claudio Hürzeler, and one or two others depending on who is advising — are excellent and perpetually booked. They are not always the right fit for a specific project, a specific timeline, or a specific aesthetic. And none of them are general contractors — they are architects, which means the GC match is a second decision that the architect's recommendation partially determines.

Baily operates as a second opinion layered on top of the concierge shortlist. For each Carré d'Or inquiry, Baily surfaces two to three architects — one from the canonical shortlist, one or two from a broader set of architects inscrits à l'Ordre with verified Carré d'Or permit closure in the last thirty-six months — and for each architect, two to three compatible general contractors with verified décennale attestations covering Monaco, verified détachement filings, and verified DPU permit closure track records. The shortlists are named, not anonymous. The architect's portfolio is linked. The general contractor's last three Monaco projects are summarized. No lead auction. No dozen contractors calling you. No re-explaining your project to each new intake.

Scope building is bilingual French and English from the first conversation, in the language you prefer. The architect introductions are coordinated through your notaire if that is your preferred pattern, or direct if you prefer. Décennale verification, détachement verification, and recent-permit verification happen before Baily sends the introduction, not after. If Baily cannot verify, Baily does not introduce.

---

Frequently asked questions

Q: Can I replace the original wood windows in my Carré d'Or apartment?

Yes, with exact profile, material, and color match. The DPU requires joinery sample submissions before permit grant and reviews each sample against the unit's historic profile. Wood (bois) is mandatory; PVC is refused outright regardless of how well it mimics wood visually. Specialist French Riviera menuisiers — Loison in Nice, Millet in Cannes, Atelier Bois in Vallauris — produce historically compatible joinery with double or triple glazing within the original profile, typically running twelve to thirty-five thousand euros per window depending on size, glazing class, and hardware. Lead time is ten to fourteen weeks from order to install. A full Carré d'Or apartment window replacement runs four to six months from specification to completed install, and is filed within the overall DPU permit rather than as a separate authorization.

Q: How do I handle an air conditioner condenser in the Carré d'Or?

Concealed outdoor units only. Visible condensers on balconies, terraces, facades, or visible roof positions are categorically refused. The standard solution is a variable refrigerant flow (VRF) system with a single or dual outdoor unit routed through a concealed service shaft, a rooftop plant room, or a below-grade technical level, and connected via refrigerant piping to multiple indoor units distributed across the apartment. Daikin VRV, Mitsubishi City Multi, and Hitachi Set Free are all systems that Monaco's electrical engineering offices have specified repeatedly and that DPU has approved. Cost impact on a two hundred square meter apartment: forty to one hundred and twenty thousand euros above a conventional multi-split installation, depending on whether the building's existing service shaft has refrigerant routing capacity or whether a riser negotiation with the copropriété is required. Factor eight to twelve weeks of copropriété calendar if a new riser is needed.

Q: Does the French assurance décennale actually apply in Monaco?

Yes, via bilateral alignment between the two legal systems under the 1963 Monaco-France customs and labor union and subsequent administrative agreements. Every contractor executing construction must carry décennale, and every contractor's attestation must name the specific Monaco address, cover a period that begins before works start and runs past réception, and be issued by a carrier that accepts Monaco as a covered territory. Standard underwriters are MMA, AXA, Allianz, and the specialty lines at Hiscox France. Décennale follows the person executing the work, not the main contract — the main GC's attestation does not automatically extend to subcontractors. Baily verifies the main GC's attestation and samples subcontractor attestations in the four highest-exposure trades (plumbing, electrical, waterproofing, structural) before match confirmation. Monaco premiums run twenty to forty percent higher than mainland France, reflecting claim values that track Carré d'Or construction values.

Q: Can a Nice-based general contractor legally work in Monaco?

Yes, with a déclaration de détachement filed with Monaco's Direction du Travail before works start. Détachement names the workers who will cross the border, lists the Monaco site address, and specifies the project duration, with renewal on a per-project basis. The regime is routine for Nice, Beausoleil, Roquebrune-Cap-Martin, and Cap-d'Ail contractors — sixty to seventy percent of Monaco renovation volume on existing building stock is executed by French Riviera entreprises working under détachement. Separate from détachement, invoicing and TVA must be structured correctly to avoid stranding TVA between the two administrations. On renovations above one million euros, the standard structure is either a Monégasque succursale of the French entreprise or a Monaco-registered entreprise as contractual front with the French entreprise as sub. Baily verifies détachement filings and invoicing structure before match confirmation.

Q: How long does a DPU permit take for a Carré d'Or interior renovation?

Interior-only works on post-1975 buildings typically review in eight to twelve weeks from dossier filing to authorization grant. Interior works on pre-1975 Belle Époque buildings with classified interior elements typically run twelve to sixteen weeks due to the DPU's consultation with the Commission des Sites et Monuments. Interior works that include façade-adjacent changes — window profile or glazing changes visible from the exterior, AC condenser positioning decisions that affect the façade reading, or loggia infills — push to twenty-four to forty-eight weeks because they trigger a parallel façade review. Pre-filing consultation with the DPU reviewer catches most issues before formal filing and is the single highest-leverage practice in compressing timelines; architects who skip the pre-consultation cost their clients two to four months on average.

---

En bref (Français)

La rénovation d'un appartement du Carré d'Or à Monaco est définie par une règle simple : la façade est gelée, l'intérieur est libre. La DPU (Direction de la Prospective, de l'Urbanisme et de la Mobilité), autorité unique de délivrance sous l'Ordonnance Souveraine n° 3.647, instruit une demande d'autorisation de travaux en huit à seize semaines pour un projet d'intérieur standard, vingt-quatre à quarante-huit semaines pour les travaux touchant la façade ou le volume. Les normes techniques françaises — DTU et NF — s'appliquent directement, ce qui permet aux entreprises générales niçoises et mentonnaises d'exécuter la majorité du volume sous déclaration de détachement auprès de la Direction du Travail. L'assurance décennale française, obligatoire sous l'article 1792 du Code civil, s'applique en Principauté avec des primes vingt à quarante pour cent supérieures à la France continentale. Le dossier SMEG (électricité, gaz, eau) se dépose en parallèle de la demande DPU dès la première semaine — en retarder le dépôt coûte invariablement deux à trois mois en fin de chantier. Baily propose deux à trois architectes inscrits à l'Ordre et deux à trois entreprises générales vérifiées par inquiry, avec vérification préalable de la décennale, du détachement, et du permis DPU fermé dans les trente-six derniers mois. Pas d'enchère, pas de douze entrepreneurs, pas de réexplication. Une mise en relation concierge, bilingue, structurée autour de la réalité opérationnelle du Carré d'Or.

---

Citations and sources

• Direction de la Prospective, de l'Urbanisme et de la Mobilité (DPU), Gouvernement Princier de Monaco. https://www.gouv.mc/Gouvernement-et-Institutions/Le-Gouvernement/Departement-de-l-Equipement-de-l-Environnement-et-de-l-Urbanisme/Direction-de-la-Prospective-de-l-Urbanisme-et-de-la-Mobilite
• Ordonnance Souveraine n° 3.647 du 9 septembre 1966 sur l'urbanisme, la construction, et la voirie. Journal de Monaco. https://journaldemonaco.gouv.mc/
• Loi n° 1.329 du 8 janvier 2007 relative à la copropriété des immeubles bâtis. https://legimonaco.mc/
• Code Civil (France), Article 1792 — garantie décennale. https://www.legifrance.gouv.fr/codes/article_lc/LEGIARTI000006441920
• DTU 25.41 (plâtrerie), DTU 43.1 (étanchéité), DTU 60.1 (plomberie), NF C 15-100 (électricité). AFNOR. https://www.afnor.org/
• Société Monégasque de l'Électricité et du Gaz (SMEG). https://www.smeg.mc/
• Monaco Direction du Travail — déclaration de détachement. https://www.gouv.mc/Gouvernement-et-Institutions/Le-Gouvernement/Departement-des-Affaires-Sociales-et-de-la-Sante/Direction-du-Travail
• Ordre des Architectes — Conseil Régional PACA. https://www.architectes.org/annuaires/liste-ordre?region=provence-alpes-cote-dazur&dept=06
• Knight Frank Wealth Report 2024 — Monaco prime residential pricing. https://www.knightfrank.com/wealthreport
• Commission des Sites et Monuments, Monaco — éléments intérieurs protégés inventory. DPU internal reference, cited in Humbert & Poyet and Federico Delrosso Monaco public case studies.

---

Baily is an AI scoping tool, not a licensed contractor or architect. All estimates, permit guidance, and regulatory references are preliminary and informational. Final scoping, permits, and all construction work are performed by Baily's vetted Certified Partner architects and general contractors in Monaco, who hold all required inscriptions, insurance, and permit track records.

Last updated: 2026-04-19