lja architecture
LJA Architecture is a private French architectural partnership in Cesson-Sévigné, Brittany, delivering heritage restoration (Pôle Patrimoine) and contemporary new construction (Pôle Contemporain) for public, residential, commercial, and hospitality clients across the region.
- Company typePrivate
- Founded1985
- HeadquartersCesson-Sévigné, France
- Headcount11–50
- GTM typeB2B
- OfferingServices
What lja architecture does
LJA Architecture is a private French architecture partnership headquartered in Cesson-Sévigné, Brittany, operating under SIREN 852 106 863. Founded in 1985 as SCP Liouville et Jan by Pascal JAN and Christian LIOUVILLE, the practice was reincorporated in 2019 under the current four-associate partnership of Lydie PIVOT-LEMEE, Nicolas BAILLY, Fanja ANDRIAMADY (architects), and Arnaud LEBOUC (construction supervisor), supported by approximately 10 collaborators covering architecture, construction economics, interior design, and administration.
The firm is organized around two specialized service poles. The Pôle Patrimoine handles heritage restoration, including PSMV-regulated historic building renovation, facade and roof restoration, and post-disaster reconstruction (notably the HLM Les Foyers fire-damaged social housing in Vitré and the Palais du Commerce facade restoration). The Pôle Contemporain delivers new construction and rehabilitation across housing (Epicure, Les Timoniers, Les Rives St-Hélier), hospitality (Domaine de la Reposée hotel complex), commercial retail (Uniqlo store), office buildings (C8 at €11.8M, Keiji, Bureau Concept), public facilities (CFAI training center, three Mairie projects), and industrial buildings (Chêne Morand). Project fees vary by scope, with construction values ranging from €100,000 (Mairie de Billé thermal renovation) to €11,800,000 (C8 office building).
LJA Architecture generates revenue through professional architecture fees billed per project on a sales-led basis, serving private developers, social housing providers, municipalities, and commercial clients across the Brittany region. Distribution is via direct client engagement, referrals, and public procurement processes for government projects. There are no disclosed funding rounds, no external investment, no AI/ML capabilities, and no digital product offerings — the firm's value proposition rests entirely on partner expertise, dual-pole specialization, heritage regulatory knowledge, and an established regional portfolio.
lja architecture firmographics
Firmographics- Name
- lja architecture
- Legal name
- LJA Architecture
- Website
- https://lja.bzh
- Company type
- Private
- Founded year
- 1985
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- LJA Architecture is a private French architectural partnership in Cesson-Sévigné, Brittany, delivering heritage restoration (Pôle Patrimoine) and contemporary new construction (Pôle Contemporain) for public, residential, commercial, and hospitality clients across the region.
- Ownership category
- akta.pro rank
lja architecture industry classification
Industry- Product category
- Architectural Services
- NAICS
- Architectural Services (54131), Interior Design Services (541410)
- SIC
- Services-Engineering Services (8711)
- akta.pro primary industry
- Architectural Design Services (BPAHAKAA)
- akta.pro secondary industries
- Historic Preservation & Conservation Planning (BPAHAKAH), Historic Home Renovation & Preservation (HSAPAEAG)
Keywords
Where lja architecture is headquartered
LocationHeadquarters
- HQ city
- Cesson-Sévigné
- HQ country
- France
- HQ region
- Europe
Offices1 record
Markets served
lja architecture business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Operations, Marketing or Sales, Others
Revenue model
- Architecture and design services: Professional architecture services including design, project management, construction supervision, and heritage restoration consulting. Revenue is generated through fees for architectural services on a per-project basis.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Other | — | Professional architecture fees |
Go-to-market motion1 record
Distribution channels2 records
Marketing channels2 records
lja architecture product offering
Product offeringCore offering
LJA Architecture is a professional architecture firm offering design, project management, and construction supervision services through two specialized poles. Pôle Patrimoine handles heritage restoration, facade and roof restoration, post-disaster reconstruction, and adaptive reuse of historic structures. Pôle Contemporain handles new construction and rehabilitation across residential, commercial, hospitality, education, public facility, and industrial building sectors, with each project receiving custom design tailored to its site and program.
Product overview
LJA Architecture operates as an architecture firm organized around two main service poles: the contemporary architecture pole (Pôle Contemporain) handling new construction and rehabilitation across housing, hospitality, offices, and public facilities, and the heritage architecture pole (Pôle Patrimoine) specializing in restoration and renovation of historic buildings. The firm is led by 4 associates including architects and a construction manager, supported by approximately 10 collaborators. Projects span commercial spaces (UNIQLO store, restaurants), office buildings (C8, Keiji, Bureau Concept, CPBM), hospitality (La Reposée hotel complex), residential developments (Epicure, Les Timoniers, Les Rives St-Hélier), public facilities (CFAI training center, schools, community centers), and heritage restoration (Palais du Commerce, HLM Les Foyers, Halle de la Courrouze).
Differentiator
Problem solved
Functional benefit
Brands
- Pôle Patrimoine: Heritage restoration division focusing on historic building renovation, facade restoration, and adaptive reuse of old structures.
- Pôle Contemporain
Companies that use lja architecture
Customer profileNamed customers12 records
Segments3 records
Ideal customer profiles3 records
lja architecture technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
lja architecture partnerships and signals
Strategic signalPartnerships
Eight partnerships are on record, tiered core and minor.
- I2C (BET structure, fluides, thermique, électricité)coreEngineering consultancy providing structural, fluid, thermal, and electrical BET services. Collaborates on EPICURE residential project (38 units + 2 houses + micro-crèche, 2,713 m², 5.5M€).
- ARPAC IngénieriecoreEngineering firm providing DET (direction de l'exécution des travaux) and economic studies. Frequent collaborator on projects including thermal renovation, poly-sport hall, creperie, and various heritage projects.
- SOCOTECcoreTechnical control and inspection organization (CT - Contrôle Technique). Collaborates on EPICURE and Les Rives St-Hélier projects for technical compliance verification.
- IPAC ConseilcoreSPS (Sécurité et Protection de la Santé) coordination consultancy. Provides health and safety coordination services on construction projects.
- CUBE IngénieriecoreEngineering consultancy providing DET and economic studies. Partner on Chêne Morand industrial building and CFAI training center projects.
- Communauté de communes de Moyenne vilaine & de SemnonminorCommunity of communes as client for Bain-de-Bretagne offices project (extension and renovation of 605 m² building, 970,000€).
- BETOM (DET/économie/structure/fluides/thermique)coreFull-service engineering consultancy providing DET, economics, structural, and MEP services. Partner on C8 office building project (7,332 m², 11.8M€).
- TPFI (BET fluides/structure/VRD)coreMulti-discipline engineering (MEP, structural, VRD). Key partner on La Reposée hotel complex project.
Scale indicators3 records
Recent moves5 records
Expansion highlights3 records
lja architecture competitors and assessment
Company assessmentBroad incumbents
- Groupe-6: Larger French architecture firm with broad portfolio across healthcare, education, housing, and urban planning. Competes with LJA for public-sector tenders in France but at a meaningfully larger bench and geographic footprint.
- AIA Life Designers: Multi-disciplinary French architecture firm with healthcare, education, housing, and heritage specializations. Comparable in offering breadth and dual heritage/contemporary capability, but operates at a substantially larger national scale than LJA.
- Architecture-Studio: Major French architecture firm with international practice across cultural, public, and commercial projects. A broader incumbent competing with LJA for high-profile commissions, with substantially greater resources.
Direct peers
- ECDM Architectes: French architecture practice with a comparable mid-sized profile working across residential, commercial, and public projects, including rehabilitation and heritage work. Directly comparable in scale, project mix, and regional French operating model.
- Hamonic+Masson: French architecture firm with strong contemporary residential, hospitality, and mixed-use portfolio. Comparable to LJA's Contemporain pole in project type (housing, hotels, public facilities) and mid-sized French firm scale.
- Atelier d'Architecture Bruno Gaudin: French architecture firm with strong heritage and cultural-building expertise (notably on Louvre and Grand Palais projects). Comparable to LJA in combining contemporary architecture with heritage restoration, though at a higher marquee-project scale.
- DT Architecture: Mid-sized French architecture firm working on housing, heritage, and public equipment — directly comparable in scale and project mix to LJA's Contemporain and Patrimoine poles.
- Barthélémy Griño: French architecture firm specializing in historic monuments and heritage restoration, frequently cited alongside LJA's Patrimoine pole for PSMV and protected-sector work.
- Patriarche: French architecture firm with a strong heritage/restoration specialization, directly comparable to LJA's Pôle Patrimoine. Operates across France on historic restoration, rehabilitation, and adaptive reuse, often competing for similar public and private heritage commissions.
Regional players
- Lemoal Lemoal Architectes: French architecture firm with a strong Breton regional identity and contemporary/housing portfolio. Comparable to LJA as a regional Breton/Western France architecture practice competing for similar local housing and public commissions.
Market position
Strengths4 records
Weaknesses4 records
Competitive moat3 records
Key risks6 records
Key highlights6 records
Customer concentration
lja architecture social profiles
Digital presencelja architecture financial estimates
Financial estimateRevenue estimate
Valuation estimate
lja architecture leadership team
Management profileNumber of profiles
Profiles4 records
lja architecture funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
lja architecture M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about lja architecture
What does lja architecture do?
LJA Architecture is a professional architecture firm offering design, project management, and construction supervision services through two specialized poles. Pôle Patrimoine handles heritage restoration, facade and roof restoration, post-disaster reconstruction, and adaptive reuse of historic structures. Pôle Contemporain handles new construction and rehabilitation across residential, commercial, hospitality, education, public facility, and industrial building sectors, with each project receiving custom design tailored to its site and program.
Is lja architecture a public or private company?
lja architecture is a private company. It is classified as management employee owned and is currently operating.
When was lja architecture founded?
lja architecture was founded in 1985. It employs 11 to 50 people.
Where is lja architecture based?
lja architecture is headquartered in Cesson-Sévigné, France, in the Europe region.
How does lja architecture make money?
One revenue line is on record: architecture and design services.
Who are lja architecture's main competitors?
Broad incumbents on record are Groupe-6, AIA Life Designers and Architecture-Studio. Direct peers are ECDM Architectes, Hamonic+Masson, Atelier d'Architecture Bruno Gaudin, DT Architecture, Barthélémy Griño and Patriarche. Lemoal Lemoal Architectes is listed as a regional player.
Does lja architecture have an API?
No public API is recorded for lja architecture.
What industry is lja architecture in?
lja architecture's product category is Architectural Services. Its primary akta.pro industry code is BPAHAKAA, Architectural Design Services, with a secondary code of BPAHAKAH, Historic Preservation & Conservation Planning. Its NAICS code is 54131 and its SIC code is 8711.