Data from the official company registers of 12 countries. Not an official register.

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BY CONSTRUCTIONS

ActiveSIREN number 850 114 802Simplified joint-stock company (SAS)Est. 201991.30 · Conservation, restoration and other support activities for cultural heritageMagnanville, Île-de-France
Official record (Annuaire des entreprises) ↗
Age7 years
older than 7% of its sector
Same activity, France12,022live companies · 11203rd oldest
In Magnanville521live companies · 5 in the same activity
At this address132live companies incl. this one

In brief

BY CONSTRUCTIONS is a simplified joint-stock company (SAS) registered in France on 1 May 2019. It is 7 years old; 93% of the 12,022 live companies whose main activity is conservation, restoration and other support activities for cultural heritage are older. Its registered office is in Magnanville, Yvelines, Île-de-France, at an address shared with 131 other live companies. 5 live companies in Magnanville share the same main activity.

Register details

Registered nameBY CONSTRUCTIONS
SIREN number850 114 802
Company typeSimplified joint-stock company (SAS)
Registered office15 Rue Des Mongazons, 78200 Magnanville
Nature of business (NACE Rev. 2.1 (French NAF 2025))91.30 Conservation, restoration and other support activities for cultural heritage
International sector (ISIC Rev.4)F · 41 Construction of buildings

Timeline

Register events, newest first.

  • Incorporated

Register entries

From the register.

Incorporated1 May 2019

Conservation, restoration and other support activities for cultural heritage in France

Live companies whose main activity is 91.30: 12,022 in total, median age 19 years, 14 incorporated in the past 12 months.

All 12,022 companies
This company's decadeOther decades
02,5005,0007,50010,0001900s: 441900s1950s: 111950s1960s: 11111960s1970s: 30301970s1980s: 1041041980s1990s: 6946941990s2000s: 7,8397,8392000s2010s: 2,6032,6032010s2020s: 7367362020s
Incorporated per year, still live
02004006008002011: 45020112012: 3492013: 29420132014: 2182015: 16120152016: 1822017: 15020172018: 1302019: 11720192020: 1402021: 16720212022: 2042023: 11820232024: 772025: 1720252026: 13

Location

Registered office in Magnanville, Yvelines, Île-de-France.

Live companies in Magnanville521
Same activity in Magnanville5
Live companies in Yvelines151,787
New in Magnanville, past 12 months33

Also registered at this address

131 other live companies share this registered office; shown are those incorporated closest in time to this one.

Similar companies

Live companies with the same main activity, nearest first.

Compare all
SR
SAS ROBLES CREATEURSViroflay, Île-de-France
Number 851 198 317Est. 2019
D
DELPAMPoissy, Île-de-France
Number 850 133 968Est. 2019
BR
B2L REALISATIONLe Pecq, Île-de-France
Number 851 380 162Est. 2019
YR
YVELINES RENOVATIONSartrouville, Île-de-France
Number 843 437 591Est. 2018
R
RENOVATION.COMChanteloup-les-Vignes, Île-de-France
Number 842 537 417Est. 2018
ES
EXOD STUDIOGuyancourt, Île-de-France
Number 882 252 844Est. 2020

Sources

Register data: Insee, Sirene database of companies and establishments (Licence Ouverte / Open Licence 2.0), delivery of 21 October 2026. Territories: Insee, Code officiel géographique 2026. Industry names: European Union, EU Vocabularies (NACE Rev. 2.1). Context figures are computed by FirmsDB from these sources. This page is not an official register; check the company's entry in the French government business directory before relying on it.