What Stéphane Thouin Architecture does

Stéphane Thouin Architecture is a French heritage architecture firm founded in 1989 by Stéphane Thouin, an Architecte du Patrimoine graduate of the École de Chaillot who passed the prestigious Architecte en Chef des Monuments Historiques (ACMH) competition in 1991. The firm specializes in the restoration and valorization of classified historic monuments, encompassing religious buildings (cathedrals, abbeys, churches), military and civil structures (castles, bastions, bridges, canals), and archaeological sites, with a documented portfolio of 35+ projects across the Nouvelle Aquitaine and Occitanie regions, plus selected commissions in the Paris region including the Hôtel Salé for the Musée National Picasso.

The firm operates as a SARL (Société à responsabilité limitée) with declared social capital of €16,800, headquartered at 54 Rue des Augustins in Agen (since 1997), with a regional antenna in Montauban (since 2012) co-directed by Nicolas Calandre. Total headcount is 8 professionals across both offices, including the founder, co-director, architects, and an administrative-financial manager. The firm's core technology is specialist heritage expertise: ancient building pathology analysis, classified-monument compliance, and heritage valorization — supported by a network of recurring engineering, structural, lighting, and archaeology partners (AC2I BET, BETEM, Ingénierie 47, AIA Ingénierie, among others).

Revenue is generated exclusively through project-based professional services fees for heritage restoration and rehabilitation projects, sourced primarily through French public procurement (DRAC, municipalities, departmental councils) and direct private commissions. The firm does not disclose pricing publicly, and there is no evidence of consumer-facing digital products, subscription offerings, or recurring revenue streams. Customer acquisition is driven by institutional reputation, DRAC referrals, and the ACMH credential rather than active marketing.

Name

Stéphane Thouin Architecture

Legal name

Stéphane THOUIN Architecture

Website

https://s-thouin-architecture.fr

Company type

Private

Founded year

1989

Operating status

Operating

Headcount range

1–10 employees

Short description

Stéphane Thouin Architecture is a French heritage architecture firm founded in 1989, specializing in restoration and valorization of classified historic monuments. With 8 staff across Agen and Montauban offices, it serves public-sector clients (DRAC, municipalities, departmental councils) and selected private commissions across Nouvelle Aquitaine, Occitanie, and Paris.

Ownership category

akta.pro rank

Product category

Heritage Architecture Services

NAICS

Architectural Services (541310)

akta.pro primary industry

Historic Preservation & Conservation Planning (BPAHAKAH)

akta.pro secondary industry

Landscape Architecture & Site Design (BPAHAKAC)

Keywords

• Heritage restoration
• Monument rehabilitation
• Historic building analysis
• Architecte en chef
• Heritage valorization

Headquarters

HQ city

Agen

HQ country

France

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Infrastructure, Others

Revenue model

1. Heritage Restoration Architecture Services: Project-based professional fees for architectural services including restoration studies, heritage building analysis, monument rehabilitation, and public space interventions. Revenue is derived from public and private clients commissioning specific monument projects, typically through competitive tendering for public sector work.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels2 records

Core offering

Stéphane Thouin Architecture is a heritage architecture firm offering specialist professional services in the restoration and enhancement of historic monuments. Its core work covers restoration studies, ancient building analysis and pathology assessment, heritage valorization, and public space development in historic centers, delivered to public and private clients commissioning classified monument projects.

Product overview

Stéphane Thouin Architecture is a heritage architecture firm offering specialist services in the restoration and valorization of historical monuments. The firm's core offering encompasses building analysis, pathology assessment for ancient structures, heritage valorization, public space projects in historic centers, and renovation/rehabilitation of monumental ensembles. Their portfolio spans religious and military heritage buildings, bridges, mills, canals, gardens, and civil architecture spanning from ancient sites through 19th-century and early 20th-century monuments. Services are delivered across two offices (Agen and Montauban) in the Nouvelle Aquitaine and Occitanie regions of France, with project management and restoration services provided for public and private clients.

Differentiator

Problem solved

Functional benefit

Products and services

• Heritage Restoration and Monument Rehabilitation Services Full architectural restoration and rehabilitation services for classified historic monuments, including studies, project management, and on-site restoration supervision for public and private clients.
• Ancient Building Analysis and Pathology Assessment Diagnostic studies of old building fabric, pathology assessment of ancient structures, and heritage building analysis to guide restoration strategy.
• Heritage Valorization and Public Space Development Public space projects in historic centers and valorization of heritage assets, including museum and cultural site development for public sector clients.
• Pre-Study and AMO (Assistance à Maîtrise d'Ouvrage) Services Pre-project studies and project owner assistance (assistance à maîtrise d'ouvrage) for heritage owners planning major restoration, modernization, or restructuring works.

Quantifiable outcome

• 35 heritage restoration projects documented across religious (cathedrals, abbeys, churches), military (bastions, castles), civil (bridges, mills, canals, houses) and archaeological monuments
• +1 more outcomes

Named customers23 records

Segments2 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Ten partnerships are on record, tiered core and minor.

• AC2I BETcoreImplementation/ SI/ Consulting PartnerIngénierie et bureau d'études infrastructure. Provides complementary engineering expertise for infrastructure aspects of heritage projects. Located at 24 bis boulevard Édouard Lacour. Regular collaboration with the agency on structural and infrastructure analysis.
• BETEMcoreImplementation/ SI/ Consulting PartnerBureau d'études techniques based in Toulouse (ZAC de Montblanc). Provides technical engineering studies for building projects, supporting the agency's structural and technical design work on heritage restoration projects.
• Ingénierie 47coreImplementation/ SI/ Consulting PartnerGénie électrique, électronique, automatisme industriel based in Agen (65 Boulevard Scaliger). Provides electrical, electronic and industrial automation engineering for heritage building systems upgrades.
• Laurent TaillandiercoreImplementation/ SI/ Consulting PartnerÉconomiste de la construction based in Quint Fonsegrives. Provides construction economics and quantity surveying expertise for project cost estimation and budget management on heritage projects.
• Hélène SirieyscoreImplementation/ SI/ Consulting PartnerPaysagiste DPLG (landscape architect). Provides landscape architecture services for heritage site development and public space projects. Collaborated on Bastion Royal project in Bayonne.
• Yon Anton-OlanocoreImplementation/ SI/ Consulting PartnerIngénieur conseil en éclairage, concepteur de lumière based in Bordeaux. Specializes in lighting design for heritage monuments, providing specialist illumination expertise for heritage enhancement projects. Collaborated on Abbaye de Saint-Sever.
• AIA IngénieriecoreImplementation/ SI/ Consulting PartnerStructure des bâtiments et génie civil based in Mérignac. Provides structural engineering and civil engineering services for building structure analysis and reinforcement on heritage restoration projects. Collaborated on Église Saint-Jean-Baptiste de Cornac emergency works.
• Gilles SéraphincoreImplementation/ SI/ Consulting PartnerArchitecte du patrimoine and archéologue du bâtiment based in Cahors. Provides specialist heritage architecture and building archaeology expertise for heritage analysis and documentation.
• Cabinet ThemisminorOthersProfessional partner referenced in the firm's partner network. Details of specialization not specified on the website.
• Christian CorvisiercoreImplementation/ SI/ Consulting PartnerHistorien de l'architecture (architectural historian) based in Bruyère-sur-Fère. Provides specialist architectural history expertise for heritage documentation and historical analysis of monuments.

Scale indicators3 records

Recent moves7 records

Expansion highlights4 records

Direct peers

• Atelier Bony: French heritage architecture practice with restoration work on classified monuments, particularly in central and southern France. Comparable as a similarly sized ACMH-styled firm competing for the same regional DRAC and commune-led restoration tenders.
• Pierre-André Lablaude: ACMH architect in Paris known for Notre-Dame cathedral restoration leadership and major classified-monument projects. Closely comparable specialty (classified historic monument restoration under DRAC oversight) and ACMH credentialing to Stéphane Thouin Architecture.
• Frédéric Didier: Architecte du patrimoine and ACMH based in Lyon, operating across French regions with a similar portfolio of religious and civic monument restorations. Comparable as a regional heritage architect with equivalent accreditation and customer base (DRAC, communes, departmental councils).
• Atelier Roland Schweitzer: Paris-based heritage architecture firm led by ACMH Roland Schweitzer, specializing in restoration of historic monuments. Directly comparable in scope and regulatory accreditation (ACMH title) to Stéphane Thouin Architecture, and competes for similar DRAC-led classified-monument tenders.

Emerging players

• Mathieu Lours: Architecte du patrimoine and researcher specializing in historic monument analysis and restoration, with academic and project work in southern France. Comparable in specialty focus (ancient building analysis, heritage architecture) though smaller and more research-oriented than the subject firm.

Broad incumbents

• ARTE Charpentier Architectes: Paris-based architecture firm active in cultural, institutional and heritage-related building projects. Comparable as a competitor for cultural-heritage and museum commissions but operating at significantly larger scale and broader typology.
• Wilmotte & Associés: Established French architecture practice with significant cultural-heritage and museum restoration projects (e.g., Villa Cavrois, Louvre-Lens vicinity works). Comparable at the heritage-museum intersection though with a much broader portfolio than the subject firm.
• Architecture-Studio: Major French architecture firm with heritage and cultural-building work alongside broader urban and institutional projects. Larger incumbent with overlapping capabilities in museum and monument design but broader portfolio; relevant for public heritage tenders where scale matters.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/stephane-thouin-architecture

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles8 records

Funding overview

Funding rounds

Investors

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M&A

Investments

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