Room additions & extensions in 19e Arrondissement (Buttes-Chaumont / La Villette)
19e Arrondissement (Buttes-Chaumont / La Villette) is 19e arr. — Buttes-Chaumont's late-19th c. industriel + 1920s hbm + late-20th c. zac submarket. The 19e contains the largest cohort of 1920s HBM (Habitations Bon Marché) in Paris — these blocks share a uniform structural language (load-bearing brick + steel I-beams + concrete slab) that means restoration specifications developed on one block frequently transfer to others, but the cooperative governance of HBM co-propriétés can stretch any AG vote to 14-22 months.
What a room additions & extensions project looks like here
The 19e contains the largest cohort of 1920s HBM (Habitations Bon Marché) in Paris — these blocks share a uniform structural language (load-bearing brick + steel I-beams + concrete slab) that means restoration specifications developed on one block frequently transfer to others, but the cooperative governance of HBM co-propriétés can stretch any AG vote to 14-22 months.
Bassin de la Villette Site Inscrit (1972) extends ~200 m landside — buildings facing the canal are subject to landscape-impact review on any window enlargement or balcony addition, even where PLU otherwise permits them.
Paris extensions are rare in the historic core — typically attic / combles conversion or rooftop addition (surélévation). PLU governs maximum hauteur plafond, Permis de Construire required, ABF veto on PSMV-listed faubourgs. In 19e Arrondissement (Buttes-Chaumont / La Villette) specifically, late-19th c. industriel + 1920s hbm + late-20th c. zac stock means room additions & extensions scope is shaped by the neighborhood's dominant construction typology. Baily's Paris scoping flow factors buttes-chaumont site inscrit and bassin de la villette + canal de l'ourcq site inscrit into the estimate before a contractor is involved.
Start your 19e Arrondissement (Buttes-Chaumont / La Villette) scope — Baily asks the right questions.
Pre-seeded for room additions & extensions in 19e Arrondissement (Buttes-Chaumont / La Villette). Mention your 40-130 m² appartements, your timeline, and any known constraints — Baily factors the mairie du 19e + mairie de paris (du) 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
19e Arrondissement (Buttes-Chaumont / La Villette) room additions & extensions projects typically run $75K–$385K. 19e Arrondissement (Buttes-Chaumont / La Villette)'s late-19th c. industriel + 1920s hbm + late-20th c. zac stock, combined with buttes-chaumont site inscrit — park edge buffer, puts most mid-complexity projects in the $230K range. Baily scopes the exact band once you describe the work.
Nearest neighborhoods
Same service, adjacent Paris submarkets.