All architects in Boissy-sous-Saint-Yon
5 active architecture establishments in Boissy-sous-Saint-Yon (Essonne, 91), according to INSEE's Sirene register (data of 26 October 2026).
- Practices
- 5
- Per 10,000 residents
- 12.9
- Companies
- 4
- Founded since 2025
- 0
Boissy-sous-Saint-Yon (population 3,882) has 5 architecture practices: 12.9 per 10,000 residents, against 2.7 on average in the department (Essonne). 4 are companies and 1 are architects working as sole practitioners. The oldest company still active, FL Architecture, was founded in 2009.
Planning rules in Boissy-sous-Saint-Yon: see the local plan (PLU) on the Géoportail de l'urbanisme ↗
5 results
| Firm | Town | Phone | Founded | Type |
|---|---|---|---|---|
| Archi Fabrik | Boissy-sous-Saint-Yon 5 Rue de l'Ormeteau, 91790 | 2015 | SARL | |
| FL Architecture | Boissy-sous-Saint-Yon 44 Rue de Chatres, 91790 | 2009 | SAS | |
| Pictural Architectes | Boissy-sous-Saint-Yon 27 Rue de Chatres, 91790 | 2021 | SAS | |
| SARL Fonciere Jofa | Boissy-sous-Saint-Yon 10 Chemin de la Ferte Alais, 91790 | 2009 | SARL | |
| Severine Delamare | Boissy-sous-Saint-Yon 3 Rue du Pont Cage, 91790 | 2021 | Sole trader |
Architects near Boissy-sous-Saint-Yon
All architects – Essonne (91) →Architects in Boissy-sous-Saint-Yon: common questions
How many architects are there in Boissy-sous-Saint-Yon?
The Sirene register lists 5 active architecture practices in Boissy-sous-Saint-Yon: 4 companies and 1 architects working as sole practitioners. All of them are listed on this page, with their address and, where published, their phone number.
Is an architect compulsory to build in Boissy-sous-Saint-Yon?
As everywhere in France, an individual building for themselves must use an architect once the floor area exceeds 150 m², counting the total after works for an extension. A company, including an SCI, always needs one for a building permit. The local rules for Boissy-sous-Saint-Yon (height, position, appearance) are set out in the local plan (PLU).
How much does an architect cost in Boissy-sous-Saint-Yon?
Fees are free and set in the contract. For a full mission, from design to site supervision, pricing guides usually quote 8–12% of the cost of the works excluding VAT for a new house and 10–15% for a renovation or extension. A mission limited to the building permit application is usually a fixed fee of about €1,500–4,000 excluding VAT.
Where can I get free advice before choosing an architect?
In most departments, the CAUE (council for architecture, planning and the environment) sees individuals for free, by appointment, to help them prepare their project. The map of CAUEs is on fncaue.com.