All architects in Guyancourt
12 active architecture establishments in Guyancourt (Yvelines, 78), according to INSEE's Sirene register (data of 26 October 2026).
- Practices
- 12
- Per 10,000 residents
- 4.0
- Companies
- 5
- Founded since 2025
- 0
Guyancourt (population 29,778) has 12 architecture practices: 4.0 per 10,000 residents, against 5.2 on average in the department (Yvelines). 5 are companies and 7 are architects working as sole practitioners. The oldest company still active, Ebsg, was founded in 1980.
Planning rules in Guyancourt: see the local plan (PLU) on the Géoportail de l'urbanisme ↗
12 results
| Firm | Town | Phone | Founded | Type |
|---|---|---|---|---|
| Alternance Gonin et Poignonec | Guyancourt 3 Rue Jean Wiener, 78280 | 1993 | ||
| Andre Choldzynski | Guyancourt 2 Rue Helene Boucher, 78280 | 1993 | Sole trader | |
| Atia Architecture | Guyancourt 41 Boulevard Vauban, 78280 | 2021 | SARL | |
| Bureau d'Architecture | Guyancourt 6 Clos Francois Coli, 78280 | 2018 | SARL | |
| Ebsg | Guyancourt 2 Rue Helene Boucher, 78280 | 1980 | SAS | |
| Florence Collard (Bailly) | Guyancourt Petite Ferme de Villaroy Rte de Villaroy, 78280 | 2010 | Sole trader | |
| Jean Bartoli | Guyancourt 11 Rue Henri Ferchal, 78280 | 1981 | Sole trader | |
| Laurent Degrain | Guyancourt Chez Mme Scagliola 10 Rue Saint-Pol Roux, 78280 | 1992 | Sole trader | |
| MBZ Architecture | Guyancourt 28 Rue Johannes Gutenberg, 78280 | 2023 | SARL | |
| Nathalie Piot | Guyancourt 11 Rue Henri Ferchal, 78280 | 1998 | Sole trader | |
| Patrice Antoine | Guyancourt 2 Square Marat, 78280 | 1991 | Sole trader | |
| Vincent Devez | Guyancourt 3 Place Cendrillon, 78280 | 2009 | Sole trader |
Architects near Guyancourt
All architects – Yvelines (78) →Architects in Guyancourt: common questions
How many architects are there in Guyancourt?
The Sirene register lists 12 active architecture practices in Guyancourt: 5 companies and 7 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 Guyancourt?
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 Guyancourt (height, position, appearance) are set out in the local plan (PLU).
How much does an architect cost in Guyancourt?
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.