Studio City Full-Home Renovation — 2,800 sqft HPOZ Gut (22 weeks, $520K–$680K)

The structure was a 2,800 sqft 1927 Colfax Meadows Spanish Colonial Revival — single-story with a 1980s unpermitted rear addition that the owners wanted legalized under the renovation permit. The parcel sat inside the Colfax Meadows HPOZ (Historic Preservation Overlay Zone, established 2007), which covers a defined district between Colfax Avenue and Fair Avenue, Woodbridge Street and the Ventura Freeway.

Any exterior remodel inside an HPOZ requires a Certificate of Appropriateness (COA) reviewed by the HPOZ Board in addition to standard LADBS plan-check. The COA review covers roof pitch and material, exterior wall cladding, window proportions and muntin patterns, front-door style, porch detailing, and any landscape element visible from the public right-of-way. HPOZ review added 4 weeks to the plan-check front-end on this project.

Contract was AIA A102-2017 — Standard Form of Agreement Between Owner and Contractor where basis of payment is cost of the work plus a fee with a Guaranteed Maximum Price. GMP was set at $680,000 with a shared-savings clause at 60/40 owner/contractor below GMP. Design-build delivery meant we carried the architect relationship directly — a licensed California architect we have collaborated with on four previous HPOZ projects, familiar with the Colfax Meadows review standards.

The COA package included: existing exterior photos from four elevations, proposed exterior drawings with material callouts, a historic context statement explaining how the proposed work maintained the character-defining features of the Spanish Colonial Revival style, a window schedule showing maintained sight-line proportions with new Jeld-Wen Siteline wood windows matching the original divided-light pattern, a roof-material spec (clay S-tile from McCloud Steel, matching the 1927 original), and a landscape statement confirming no removal of historic-era street-facing mature trees.

The HPOZ Board met monthly; we caught the third-Thursday-of-the-month meeting cycle by submitting 14 days before the agenda deadline. Board review was uncontested — the project preserved all character-defining features — and the COA issued one week after the hearing. Total HPOZ add from submittal through COA: 4 weeks.

Failing the HPOZ review would have restarted the 4-week cycle and cost 4-8 additional weeks. The safe play on any Studio City HPOZ project is a pre-submittal consultation with HPOZ staff — we did a 45-minute call with the HPOZ planner two weeks before formal filing, which flagged the only two items that would have triggered delay (roof-tile color and front-door hardware) and let us correct them before the package hit the clerk's desk.

A 1927 house carried the full heritage package: knob-and-tube wiring across 60% of the circuit runs, lead-based paint on every pre-1978 exterior and interior surface, and lath-and-plaster walls throughout with trace ACM in the plaster. The demolition scope required coordination across three regulatory frameworks simultaneously — EPA 40 CFR §745 (Lead RRP), SCAQMD Rule 1403 (asbestos), and Cal/OSHA Title 8 §1532.1 (lead in construction).

Our demo subcontractor was a licensed EPA RRP-certified firm with Cal/OSHA lead compliance training. Every room's demo was preceded by plastic containment to floor-to-ceiling, HEPA-filtered negative-air machines, full PPE for crew, and wet-methods demolition. Post-demo cleanup required HEPA vacuuming and a clearance wipe sample verified by an independent industrial hygienist.

Lead-safe RRP protocols added $14,200 to the demo scope. Rule 1403 asbestos survey, notification, and abatement added $9,800. Total regulatory demo compliance: $24,000 — 4.4% of the project total, and non-optional on any pre-1978 LA house. Skipping either framework exposes the owners to EPA penalties starting at $40,000 per violation and AQMD civil penalties starting at $10,000 per day.

Knob-and-tube wiring is a fire-risk relic — it was code-compliant in 1927 and is not code-compliant on a 2025 remodel touching any circuit it carries. Our electrician ran a full rewire: 240 linear feet of 12 AWG copper Romex on 20-amp circuits, 180 linear feet of 14 AWG on 15-amp lighting circuits, and 80 linear feet of 6 AWG for the new 200-amp subpanel feeding the renovated main floor.

Main service jumped from the original 60-amp fuse box (yes, still functional — barely) to a new LADWP-served 200-amp meter, a Square D QO 200-amp main panel in the garage, and a 125-amp subpanel in the interior utility closet. The LADWP application filed at week 1, the service upgrade scheduled for week 8, and the cutover completed in half a day during our planned rough-electrical window.

Full electrical scope including LADWP coordination, new panel and subpanel, complete rewire, code-compliant GFCI and AFCI protection throughout, whole-home surge protection, and a 240V Level 2 EV charger circuit to the garage: $48,600. On any 1920s-1940s LA renovation, this is the line item that surprises owners who think they are remodeling a bathroom. Rewires are not optional on any permit that touches an existing circuit.

At week 12 the owners asked about adding a 600 sqft detached ADU to the rear yard. The timing was aggressive — we were mid-framing on the main house — but the permit path was workable because §65852.2 ministerial ADU review runs on its own clock independent of the main renovation permit.

We carved the ADU into a separate Phase 2 permit filing, kept our Van Nuys plan-checker briefed on the overall project, and filed the ADU package at week 14. Plan-check cleared at week 18 (just inside the 60-day §65852.2 window). ADU ground-break happened at week 18 and completed alongside the main renovation's finish phase at week 22.

ADU scope cost: $165,000 incremental to the base renovation GMP. Delivered on a parallel schedule that used our existing crew utilization efficiently — we had already absorbed the LADWP service upgrade (ADU shared the new 200A main), already amortized the PM and general conditions, and already had material accounts open with every relevant vendor. Net effect: the ADU came in at roughly 15% below a freestanding equivalent would have cost, which is the architectural argument for folding an ADU into an active renovation rather than a separate project.

Whole-house renovations of over 50% of the floor area trigger Title 24 2025 alteration compliance (CF1R-ALT). Our envelope scope: R-38 blown cellulose across all new and existing attic areas, R-21 batt in 2x6 exterior walls where framing was opened, new Milgard Tuscany dual-pane low-E windows throughout (U=0.27), continuous air-sealing at every wall-to-ceiling transition verified with a blower-door test at HERS final.

HVAC replacement was a 4-ton Mitsubishi hyper-heat multi-zone system serving six zones in the main house (master, three secondary bedrooms, great room, kitchen/dining), plus a 1.5-ton mini-split serving the ADU. Ducting redesigned from the original 1927 gravity system to a fully ducted forced-air layout with every run in conditioned space (not the attic) for energy-performance credit under CF1R-ALT.

Total Title 24 envelope and systems package including HERS rater verification: $78,400. Blower-door tested at 2.4 ACH50 — well inside the 5.0 ACH50 Title 24 alteration target. CF3R-ALT signed off at week 21, one week before final inspection.

Weeks 1-4: pre-construction, HPOZ COA submittal, LADBS plan-check submittal, LADWP application. Weeks 5-6: permits issued (HPOZ COA week 5, LADBS standard plan-check week 6). Weeks 7-9: demolition under EPA RRP and Rule 1403 protocols. Weeks 10-12: framing, rough structural modifications, sister-framing at rot-compromised rim joists. Weeks 13-14: ADU Phase 2 permit filing (ADU plan-check running in parallel). Weeks 13-16: full rewire, new plumbing PEX-A, gas-line re-rough, Mitsubishi line-set install across six zones. Weeks 17-18: LADWP service upgrade cutover, insulation, air-sealing, drywall hang. Weeks 19-20: tile, flooring (site-finished white oak 5-inch plank), cabinetry, millwork. Weeks 21-22: interior paint, fixtures, appliances, HERS verification, LADBS final inspection, HPOZ final compliance walkthrough, Certificate of Occupancy.

The 22-week build came in exactly on the original GMP schedule baseline. The ADU change order at week 12 did not slip the main-house completion because the ADU ran on its own parallel crew (a 3-person framing-through-finish team separate from the main-house crew). Cost-plus-GMP contract structure made the change order mechanically trivial — we issued a GMP amendment with a revised ceiling at $845,000 and shared-savings terms renegotiated for the expanded scope.

Final delivered cost: $628,400 main house + $165,000 ADU = $793,400 total. Main house cost came in $51,600 under the original $680K GMP, triggering the 60/40 shared-savings clause — owners received $30,960 rebate, contractor retained $20,640 incentive fee. Total owner out-of-pocket: $597,440 on main house + $165,000 on ADU = $762,440 all-in.

Baseline Mansionization Ordinance (BMO, LAMC 12.22.A.32) came up early in design review because the owners initially proposed a 450 sqft second-story addition above the rear bedrooms. BMO limits residential floor area ratio (RAR) in single-family zones to a tiered formula based on lot size; the 8,200 sqft Colfax Meadows lot capped out at 3,100 sqft of conditioned residential floor area. Adding a 450 sqft second story would have blown through the BMO cap and required a variance — a 16-week delay we refused to absorb.

We pivoted: kept the main house at 2,800 sqft (inside BMO cap), absorbed the 450 sqft of programmatic square footage through a combination of a reconfigured interior layout (opening up the great room) and the new 600 sqft ADU (which does not count toward the BMO cap under LAMC 12.22.A.32(c) exemptions). Owners got the usable square footage they wanted without fighting a BMO variance.

Related: see the full pillar on [full-home renovation in Studio City](/full-home-renovation-studio-city) and the detailed regulatory guide on [mansionization and the BMO/BHO ordinance](/guides/mansionization-bmo-bho) for the floor-area-ratio mechanics that shape every Studio City and Sherman Oaks renovation.