Window & door replacement in Montmartre
Montmartre is 18e arr.'s pre-haussmann village + late-19th c. ouvriers submarket. Montmartre's 1860 annexation to Paris froze the pre-existing village lot pattern — many lots are 4-7 m wide rather than the Haussmann 8-12 m minimum, which means any modern code-compliant new build needs a derogation that takes 12-18 months to negotiate.
What a window & door replacement project looks like here
Montmartre's 1860 annexation to Paris froze the pre-existing village lot pattern — many lots are 4-7 m wide rather than the Haussmann 8-12 m minimum, which means any modern code-compliant new build needs a derogation that takes 12-18 months to negotiate.
The IGC (carrière) report on Montmartre dossiers regularly finds 17-18th century mining voids 12-18 m below grade — pile foundations are the norm, adding €40K-80K to small-build budgets before above-grade scope begins.
ABF + PSMV specification — slim-profile double-glazed fenêtres bois, RGE-certified installs, Déclaration Préalable on any visible swap in a Bâtiment de France perimeter. In Montmartre specifically, pre-haussmann village + late-19th c. ouvriers stock means window & door replacement scope is shaped by the neighborhood's dominant construction typology. Baily's Paris scoping flow factors spr montmartre and abf avis conforme into the estimate before a contractor is involved.
Start your Montmartre scope — Baily asks the right questions.
Pre-seeded for window & door replacement in Montmartre. Mention your 30-130 m² + maisons, your timeline, and any known constraints — Baily factors the mairie du 18e + du + abf + spr montmartre review queue into the scope.
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Who is Baily?
Baily is named after Francis Baily — an English stockbroker who retired at 51, became an astronomer, and in 1836 described something on the edge of a solar eclipse that nobody had properly articulated before: a string of bright beads of sunlight breaking through the valleys along the moon’s rim.
He wasn’t the first to see them. Edmond Halley saw them in 1715 and barely noticed. Baily’s contribution was clarity — describing exactly what was happening, in plain language, so vividly that the whole field of astronomy paid attention. The phenomenon is still called Baily’s beads.
That’s what we wanted our AI to do. Every inbound call and text has signal in it — a homeowner’s real question, a timeline, a budget, a hesitation that means “yes but.” Baily listens to every one, 24/7, and finds the beads of light.
Baily was a businessman before he was a scientist. That’s our vibe too.
Questions LA homeowners actually ask
Montmartre window & door replacement projects typically run $14K–$145K. Montmartre's pre-haussmann village + late-19th c. ouvriers stock, combined with spr montmartre — full hilltop coverage, puts most mid-complexity projects in the $80K range. Baily scopes the exact band once you describe the work.
Nearest neighborhoods
Same service, adjacent Paris submarkets.