Colboc Sachet Architectures

What Colboc Sachet Architectures does

Colboc Sachet Architectures (COSA) is a privately-held French architecture firm founded in 2005 by partners Benjamin Colboc and Arnaud Sachet, operating from a Paris headquarters at 10 rue Bisson (75020) with a secondary office in Bordeaux. The firm offers full-lifecycle architectural design, landscape design and construction-supervision services across residential, social housing, hotel, office, educational and mixed-use typologies. Its portfolio spans 4,000–20,000+ sqm commissions including the 20,790 sqm N°150 Paris flagship on the Champs-Élysées, the 14,000 sqm Casden Banque Populaire headquarters, the 17,659 sqm Bordeaux Bassins à Flot hotel programme, the Tours de logements in Grenoble and Collège Les Sept Iles in Perros-Guirec.

The firm's technical foundation is a BIM (Building Information Modeling) methodology, in which 2D documents are extracted from virtual 3D models and a dedicated BIM manager mediates between designers, contractors and users. This is complemented by a documented "No-Design" architectural philosophy articulated around programme, structure and site, and consistent achievement of French environmental certifications (NF HQE, BREEAM excellent, Effinergie+, E+C-, RT2012). COSA also operates a Paris-based R&D platform, L'Annexe at 150 Champs-Élysées, functioning as a modelling studio, materials library, testing laboratory and exhibition gallery.

The business model is a traditional fee-based professional services model. Revenue is generated through design fees, project management fees and consultation services for public and private commissions. Projects are obtained predominantly via French architectural competitions, direct invitations from institutional and corporate clients, and professional referrals. There is no productised offering, subscription revenue or external capital. Clients span social housing operators (RIVP, Société d'Habitation des Alpes-Pluralis), real estate developers (Groupama Immobilier, Icade Promotion, Legendre Immobilier), financial institutions (Casden Banque Populaire, Axa) and public administrations (Conseil Départemental des Côtes d'Armor). The firm operates entirely within France.

Name

Colboc Sachet Architectures

Legal name

Colboc Sachet architectures

Website

https://cosa-paris.com

Company type

Private

Founded year

2005

Operating status

Operating

Headcount range

11–50 employees

Short description

Colboc Sachet Architectures (COSA) is a privately-held French architecture firm founded in 2005 that provides BIM-based architectural design, landscape and construction supervision services for residential, social housing, hotel, office, educational and mixed-use projects for public administrations and institutional real-estate developers.

Ownership category

akta.pro rank

Product category

Architecture Services

NAICS

Architectural Services (541310), Other Specialized Design Services (54149)

akta.pro primary industry

Building Information Modeling (BIM) & Digital Design Services (BPAHAKAK)

akta.pro secondary industry

Landscape Architecture & Site Design (BPAHAKAC)

Keywords

• Architectural design services
• BIM project management
• Sustainable building design
• Urban planning services
• Construction project oversight

Headquarters

HQ city

Paris

HQ country

France

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Architectural Design Services: Professional architectural services for residential, commercial, hospitality, educational, and institutional projects. Revenue is generated through design fees, project management fees, and consultation services for new construction and renovation projects.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels6 records

Core offering

Colboc Sachet Architectures is a French architectural firm providing full-lifecycle architectural design and project management services across residential, commercial, hospitality, educational, and institutional project typologies. The firm delivers planning, landscape design, urban design, and construction oversight, executed through BIM methodology with an emphasis on sustainable, environmentally certified buildings and systematic 'No-Design' architectural engineering.

Product overview

COSA Colboc Sachet Architectures is an architecture firm offering comprehensive architectural design and project management services. The firm operates as a unified studio practice with offices in Paris and Bordeaux, delivering architectural projects across multiple typologies including residential housing, hotels, office buildings, schools, and mixed-use developments. The firm's approach is grounded in BIM (Building Information Modeling) methodology, sustainable design principles (environmental certifications), and systematic architectural thinking. Services encompass the full project lifecycle from feasibility studies through construction oversight, with a focus on technical execution and material quality. No discrete software products, SaaS offerings, or modular product suites are offered.

Differentiator

Problem solved

Functional benefit

Products and services

• Architectural Design Services Full-lifecycle architectural design services for residential, commercial, hospitality, educational, and institutional projects in France, executed through BIM methodology. Delivered by partners Benjamin Colboc and Arnaud Sachet with project managers and project assistants, targeting developers, public institutions, and corporations.
• Heritage Building Redevelopment and Mixed-Use Architectural Services Architectural design for the redevelopment of historic or underutilized buildings into hotel, retail, and mixed-use programs. Prime example is the N°150 Paris project (100-room five-star hotel, shops, and cinema on the Champs-Élysées, 20,790 sqm) for Groupama Immobilier, with Perrot & Richard Architectes as associated architects.
• Hotel and Para-Hotel Architectural Design Architectural design services for hotel and para-hotel developments, combining 4-star and 3-star hotels with serviced apartments and communal facilities. Delivered for Legendre Immobilier in Bordeaux Bassins à Flot (283 hotel keys, 159 para-hotel apartments, 17,659 sqm), awarded Pyramides Nouvelle Aquitaine 2020 for urban mixity.
• Office Building Renovation and Restructuring Services Architectural design for office renovation and restructuring projects targeting corporate and financial clients. Includes the L'Amiral office restructuring in Paris XVI (16,300 sqm) for Axa, with Vinci Immobilier as delegated master contractor and EGIS as all-trades consultant. Delivered with CERTIVEA HQE excellent and BREEAM excellent certifications.
• Residential Housing and Social Housing Architectural Services Architectural design for residential housing developments, often combined with social or childcare facilities. Includes 58 housing units plus 25-crib crèche at 42 rue Docteur Blanche, Paris XVI, for RIVP, executed as a BIM Level 2 project with NF Habitat HQE v3.2 and Effinergie+ certifications.
• Mixed-Use Urban Development Architectural Services Architectural services for mixed-use urban programmes combining housing, parking, and ancillary functions. Delivered for Icade Promotion in Bordeaux Saint Jean Belcier (Armagnac programme, 5,881 sqm, 70 dwellings, 450 parking spaces), with EPA Bordeaux Euratlantique as public developer and three bio-sourced wooden-structure buildings.
• Eco-District Social Housing Architectural Services Architectural design for social housing developments within eco-districts, focused on environmental performance. Includes 75 social housing units in Grenoble eco-quartier Cambridge for Société d'Habitation des Alpes (Pluralis), delivered with RT2012 and BBC-Effinergie Promotelec -30% labels in two wooden towers.
• Corporate Headquarters Architectural Services Architectural design of corporate headquarters buildings with high environmental performance targets. Includes the 14,000 sqm Casden Banque Populaire headquarters in Champs-sur-Marne, developed with Les Nouveaux Constructeurs and EPAMARNE, delivered in 2018 with NF-HQE Bâtiments Tertiaires, Effinergie+, and HQE Passeport excellent certifications.
• Public Educational Facility Architectural Services Architectural design and supervision for public educational facilities, delivered in compliance with public procurement frameworks and environmental standards. Includes the Collège Les Sept Iles demolition and reconstruction in Perros-Guirec for the Conseil Départemental des Côtes d'Armor (3,827 sqm), with B.Houssais architecture as co-architects and certifications under Plan Climat Energie Territorial, Démarche HQE, and Label E+C-.
• BIM Project Design and Monitoring Services Building Information Modeling (BIM) methodology services that synthesize project information into a virtual 3D model from which 2D documents are extracted, enabling better control over design and technical execution. Includes a dedicated BIM manager role acting as mediator between designers, contractors, and users.
• Landscape and Urban Design Services Landscape architecture and urban design services integrated with building projects, covering ecological corridors, bio-sourced materials, and site-specific environmental design. Delivered with landscape partners including Neveux Rouyer paysagistes (Bordeaux hotel and N°150 Paris), D Paysage (Casden headquarters), and others.
• Operational and Construction Project Management Services Operational project management and construction works supervision services, supporting projects from feasibility studies through construction oversight. Delivered by the operational project management team under the leadership of Géraud Pin-Barras, with on-site supervision across the firm's portfolio.
• Sustainable and Environmental Design Consulting Environmental architectural consulting across multiple certification frameworks (NF HQE, BREEAM, Effinergie+, RT2012, E+C-, HQE Passeport). Embeds energy self-sufficiency, water recovery and recycling, biodiversity protection, and short food supply chains into building design.

Quantifiable outcome

• NF HQE 9* Cerqual Certification achieved for Armagnac Bordeaux project
• +6 more outcomes

Named customers9 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

17 partnerships are on record, tiered core and minor.

• Perrot & Richard ArchitectescoreStrategic or Co-development PartnerJoint architecture team with Perrot & Richard Architectes for the N°150 Paris project - redevelopment of buildings on Champs-Élysées into five-star hotel, shops, and cinema. COSA leads with Perrot & Richard as associated architects.
• JLL (Jones Lang LaSalle)minorOthersAssistant to the Contracting Authority for the N°150 Paris project, providing project management and advisory services.
• ANMA (Agence Nationale pour la Maîtrise d'Ouvrage)coreStrategic or Co-development PartnerANMA is the urban planner for the Bassins à Flot district in Bordeaux. COSA was invited by Legendre Groupe to present their hotel project as part of the 'negotiated urbanism' process led by ANMA, the city of Bordeaux, and Bordeaux Métropole.
• Les Nouveaux ConstructeursminorImplementation/ SI/ Consulting PartnerDeveloper for the Casden Banque Populaire headquarters project in Champs-sur-Marne.
• EPAMARNEcoreStrategic or Co-development PartnerPublic developer/aménageur for the Champs-sur-Marne development zone where Casden headquarters is located.
• Ateliers Lion AssociésminorStrategic or Co-development PartnerUrban planner for the Casden/EPAMARNE project, responsible for the overall district planning.
• Vinci ImmobilierminorImplementation/ SI/ Consulting PartnerMaster contracting authority delegated for the L'Amiral office restructuring project in Paris.
• Suitcase HospitalityminorImplementation/ SI/ Consulting PartnerAMO (Assistant à Maîtrise d'Ouvrage) for the Bordeaux hotel project.
• EPA Bordeaux EuratlantiquecoreStrategic or Co-development PartnerPublic developer for the Bordeaux Euratlantique zone. Developer for the Armagnac mixed-use programme.
• B.Houssais architecturecoreStrategic or Co-development PartnerCo-architects for the Collège Les Sept Iles project in Perros-Guirec.
• Builders & PartnersminorImplementation/ SI/ Consulting PartnerOperational project management (MOEX) for N°150 Paris and Casden projects.
• BTP consultantminorImplementation/ SI/ Consulting PartnerControl office for L'Amiral project.
• DVVD Architectes IngénieursminorStrategic or Co-development PartnerCOSA presents at DVVD's 'Causeries' - an architectural lecture series where COSA presents their 'No-Design' approach.
• Pourquoi pas! architectescoreStrategic or Co-development PartnerDesign partners with COSA for the 156 housing units project in Saint-Ouen, commissioned by RATP Group.
• OVHminorOthersWebsite hosting provider for cosa-paris.com.
• deValenceminorOthersGraphic identity services for COSA. Located at 80, rue du Faubourg Saint-Denis, 75010 Paris.
• John CrispminorOthersTranslation services for website content (French/English).

Scale indicators15 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Christian de Portzamparc: Award-winning French architect with Pritzker pedigree working on housing, cultural, and urban projects of comparable typology. Direct competitor for marquee French developer and public commissions.
• Dominique Perrault Architecture: Paris-based architecture firm with strong academic credentials and a comparable mix of French residential, cultural, and urban design projects. Direct competitor for high-prestige public and developer commissions in France.
• Architecture-Studio: Major French architecture practice with broad portfolio in housing, mixed-use, and public facilities across France and internationally. Comparable in typology and competition-led business model, though at significantly larger scale.
• Ateliers Jean Nouvel: Iconic French architecture practice with comparable typology range (housing, cultural, mixed-use, hospitality) and similar design-led positioning. Operates at larger scale internationally but competes for the same high-prestige French commissions.
• DVVD Architectes Ingénieurs: French architecture-engineering firm that hosts COSA's 'Causeries' lecture series. Comparable typology (residential, public, developer commissions) and French geographic focus, with established BIM/integrated design practice.
• Pourquoi pas! architectes: Listed as COSA's design partner on the 156-unit Saint-Ouen housing project for RATP. Comparable French mid-sized architecture practice with social housing and mixed-use focus, representing COSA's typical project-team peer level.
• Wilmotte & Associés: Paris-based architecture firm of comparable scale (60+ staff) working across French cultural, residential, and mixed-use commissions with strong design philosophy and academic ties. Closely comparable to COSA on typology, geography, and design-led positioning.

Broad incumbents

• BIG (Bjarke Ingels Group): International architecture firm with strong sustainability and BIM positioning on mixed-use and residential typologies overlapping COSA's portfolio. Operates at much larger scale and serves as a comparable reference for BIM/sustainability-led design approach.
• Herzog & de Meuron: Globally renowned architecture practice with comparable material-driven, sustainability-focused design philosophy. Represents the upper benchmark COSA's 'systematic/environmental' positioning aspires to in terms of design recognition.

Emerging players

• Studio Gang: Design-led architecture firm with comparable sustainability-first, BIM-engaged approach to housing, mixed-use, and civic projects. Comparable practice model and academic ties, though operating in the US market.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks5 records

Key highlights7 records

Customer concentration

• Xx.com/COSAarchi
• Facebookfacebook.com/COSAarchitectures
• Instagraminstagram.com/cosaarchi/?hl=fr
• Pinterestfr.pinterest.com/cosaarchi

Compliance14 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles17 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Colboc Sachet Architectures