All architects in Montesson
10 active architecture establishments in Montesson (Yvelines, 78), according to INSEE's Sirene register (data of 26 October 2026).
- Practices
- 10
- Per 10,000 residents
- 6.9
- Companies
- 3
- Founded since 2025
- 0
Montesson (population 14,549) has 10 architecture practices: 6.9 per 10,000 residents, against 5.2 on average in the department (Yvelines). 3 are companies and 7 are architects working as sole practitioners.
Planning rules in Montesson: see the local plan (PLU) on the Géoportail de l'urbanisme ↗
10 results
| Firm | Town | Phone | Founded | Type |
|---|---|---|---|---|
| Agence Villebois | Montesson 12 B Rue Martial Marigne, 78360 | 2014 | SARL | |
| Albessard Conception Architecture | Montesson 182 B Rue Rouget de Lisle, 78360 | 2012 | SARL | |
| Guy Hayon | Montesson 5 Rue des Erables, 78360 | 1992 | Sole trader | |
| Jacek Gmerek | Montesson 57 Rue Henri Richaume, 78360 | 1990 | Sole trader | |
| Karine Sibue | Montesson 2 Rue des Marais, 78360 | 2005 | Sole trader | |
| Marlene Levrier de Abreu (de Abreu) (Marlene Lda Architecte) | Montesson 29 Avenue Moliere, 78360 | 2022 | Sole trader | |
| Nicolas Caillat | Montesson 1 Avenue Messager, 78360 | 1997 | Sole trader | |
| Pierre Massieu | Montesson 35 Avenue Gounod, 78360 | Sole trader | ||
| Sandrine Gibourg | Montesson 17 Rue du Clos du Parc, 78360 | 2014 | Sole trader | |
| Stephanie Lefebvre Architecte | Montesson 20 Rue Maurice Berteaux, 78360 | 2020 | SAS |
Architects near Montesson
All architects – Yvelines (78) →Architects in Montesson: common questions
How many architects are there in Montesson?
The Sirene register lists 10 active architecture practices in Montesson: 3 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 Montesson?
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 Montesson (height, position, appearance) are set out in the local plan (PLU).
How much does an architect cost in Montesson?
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.