alt - architecture lien territoire

What alt - architecture lien territoire does

alt - architecture lien territoire is a Paris-based architecture and urban planning firm founded in 2018 by Frédéric Blaise and Guillaume Duranel (Julia Lenoir departed in 2023). The firm operates at three interconnected scales — architectural construction, participatory programming, and urban planning — and serves primarily French municipalities, inter-municipal authorities, and social housing operators, with selective work for private developers and individual clients. Its core offering combines conventional architecture and urban studies (over 50 completed and ongoing projects) with a distinctive participatory methodology that embeds residents and local stakeholders in co-design through workshops, mapping, and interviews.

The firm's most differentiated technology is the Toits Temporaires Urbains (TTU) system — a proprietary 3D modular wood construction system on a 3m × 6m grid, fully demountable and designed for three recompositions over a 21-year lifecycle. TTU was co-developed through an innovation partnership with Banque des Territoires, SNCF Immobilier, and Conseil Départemental de Seine-Saint-Denis, and was awarded under the 2024 AMI 'Engagé pour la qualité du logement demain'. The firm also developed Air des Carrières, an urban cooling bench that channels fresh air from Parisian quarries (FAIRE lauréat 2021).

Revenue is generated entirely through professional service fees on a project basis, with engagements ranging from approximately €10K (small participatory mandates) to €5.2M (large-scale social housing construction). Go-to-market is sales-led via French public procurement — competitive tenders, design competitions (Europan 13/14 wins), framework agreements (Batigère 'Construire Autrement'), and direct commissions. Pricing is quote-based, not standardised, with no digital marketing channel beyond a corporate website, Instagram, and LinkedIn. The firm's six permanent employees and ~13 collaborators operate from a single Paris 19th arrondissement headquarters.

Name

alt - architecture lien territoire

Legal name

alt - architecture lien territoire

Website

https://alt-au.com

Company type

Private

Founded year

2018

Operating status

Operating

Headcount range

1–10 employees

Short description

alt is a Paris-based architecture and urban planning firm founded in 2018 that delivers participatory architecture, urban studies, and off-site modular wood construction (TTU system) primarily to French municipalities, social housing operators, and public institutions across Île-de-France and select national locations.

Ownership category

akta.pro rank

Product category

Architectural and Urban Planning Services

NAICS

Architectural Services (541310)

SIC

Services-To Dwellings & Other Buildings (7340)

akta.pro primary industry

ADU Design, Architecture & Engineering (HSAPAMAF)

Keywords

• Architectural design services
• Urban planning services
• Participatory programming
• Modular wood construction
• Social housing architecture

Headquarters

HQ city

Paris

HQ country

France

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Architecture and urban planning professional services: The firm generates revenue by providing architecture, urban planning, and participatory programming services to public and institutional clients on a project-fee basis. Revenue is project-based, one-time, and tied to public procurement contracts and design competitions. Services span full architectural missions (conception-réalisation), partial missions (diagnostic, scenario, plan guide), and participatory programming mandates.

Pricing tiers

Go-to-market motion1 record

Distribution channels5 records

Marketing channels7 records

Core offering

alt is an architecture and urban planning firm offering three integrated service lines: architectural projects (new construction and rehabilitation of housing, schools, emergency shelters, health facilities and public buildings), participatory projects (co-design workshops and programming with inhabitants), and urban planning projects (diagnostic studies, scenario planning, master plans and consultations for municipalities and inter-municipal authorities). The firm also develops the proprietary TTU (Toits Temporaires Urbains) modular off-site wood construction system and the Air des Carrières urban cooling bench through innovation partnerships.

Product overview

Alt is an architecture and urban planning firm offering three integrated service areas: architecture projects (Projets d'architecture), participatory projects (Projets participatifs), and urban planning projects (Projets d'urbanisme). The firm operates at the intersection of multiple scales, developing multiscalar strategies with localized action strategies. Their portfolio includes residential housing (both new construction and rehabilitation), educational facilities (schools, daycare centers), public spaces (parks, squares, street furniture), emergency shelter facilities, healthcare centers, and urban studies/planning guides. A distinctive approach involves participatory programming methods where inhabitants are involved in co-designing their living spaces. The firm also specializes in modular/off-site construction (Toits Temporaires Urbains - TTU), delivering temporary buildings in wood that can be relocated and recomposed.

Differentiator

Problem solved

Functional benefit

Products and services

• Projets d'architecture (Architecture Projects) Architecture design services including new construction and rehabilitation of residential buildings, educational facilities, emergency shelters, healthcare centres, and mixed-use buildings, often delivered through modular and off-site construction methods. Targeted at municipalities, social housing operators, and public institutions in France.
• Projets participatifs (Participatory Projects) Participatory programming and co-design services that involve inhabitants, users, and local stakeholders through workshops, mapping exercises, interviews, and collaborative design sessions. Used across urban studies, public space projects, housing rehabilitations, and landscape master plans for municipalities and social housing operators.
• Projets d'urbanisme (Urban Planning Projects) Urban planning services including diagnostic analysis, scenario development, master planning guides (plan guide), and consultation processes for neighbourhoods, city centres, agglomeration entries, and economic zones. Delivered for municipalities, inter-municipal authorities, and social housing operators in France.
• Toits Temporaires Urbains (TTU) — Temporary Urban Roofs System An innovative modular off-site construction system deploying mobile, fully-wood buildings on a 3m × 6m grid designed to be entirely demountable, relocatable, and reconfigurable. Buildings can be moved every ~7 years and recomposed up to 3 times over a 21-year lifecycle, accommodating housing, shelter, activities and small ERP facilities. Developed in innovation partnership with Banque des Territoires, SNCF Immobilier, and Conseil Départemental de Seine-Saint-Denis.

Quantifiable outcome

• TTU modular buildings designed for 3 full relocations over 21 years, RE 2020 threshold compliant
• +4 more outcomes

Named customers14 records

Segments5 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Twelve partnerships are on record, tiered core, major and minor.

• Banque Publique d'Investissement (BPI France)coreStrategic or Co-development Partner · 1 January 2025Alt joined the BPI 'Architecture de demain' accelerator programme (2025 promotion), receiving personalised strategic support to develop its activity and prepare for future growth since December 2025.
• Batigère — Accord cadre 'Construire Autrement'coreStrategic or Co-development Partner · 1 January 2024Alt has been retained in Batigère's framework agreement 'Construire autrement' for innovative housing using off-site construction. The team is led by Edil Construction and includes Virtuel architecture, Ossabois, Ethic, and GERA'nium. This framework aims to develop innovative modular housing solutions leveraging off-site construction supply chains.
• Banque des Territoires (Caisse des Dépôts)coreStrategic or Co-development Partner · 1 January 2021Banque des Territoires is a core strategic partner and the parent entity of TTU (Toits Temporaires Urbains), a subsidiary of Caisse des Dépôts. The firm co-developed the TTU 3D modular wood construction system with Banque des Territoires, SNCF Immobilier, and Conseil Départemental de Seine-Saint-Denis. This innovation partnership aims to deploy mobile, modular, fully demountable wooden buildings for temporary uses (housing, hosting, activities, small ERP) that can be relocated every ~7 years and recomposed up to 3 times over 21 years.
• SNCF ImmobiliercoreStrategic or Co-development Partner · 1 January 2021SNCF Immobilier is a co-development partner in the TTU (Toits Temporaires Urbains) innovation partnership, providing real estate assets and use cases (e.g., Dunkerque railway station mixed-use building) for the TTU modular construction system. Together with Banque des Territoires and the firm, it is developing relocatable buildings on SNCF land.
• Conseil Départemental de Seine-Saint-DeniscoreStrategic or Co-development Partner · 1 January 2021The Conseil Départemental de Seine-Saint-Denis is a co-development partner in the TTU innovation partnership, providing public use cases and political backing for the modular construction system. The first TTU project (90-place emergency shelter at Stains) is located in Seine-Saint-Denis and supported by the department.
• Virtuel ArchitecturecoreImplementation/ SI/ Consulting PartnerVirtuel Architecture serves as co-architect and mandataire on multiple projects with alt, including the Gien social housing project (mandataire), Limay Village rehabilitation, and the Batigère framework. Virtuel Architecture is a long-standing operational partner in participatory architecture and modular construction.
• Toits Temporaires Urbains (TTU)coreStrategic or Co-development PartnerTTU is a subsidiary of Banque des Territoires (Caisse des Dépôts) created to deploy the TTU modular construction system. Alt serves as the architectural partner in the TTU consortium, designing buildings using the TTU system. First project: 90-place emergency shelter in Stains (under construction). Second project: Dunkerque railway station building (permit filed).
• Graal (groupement)majorStrategic or Co-development PartnerAlt participates in a groupement led by Graal for the urban study of the Sorbier slab (Elogie-Siemp, La Celle-Saint-Cloud). Alt provides participatory programming and mediation services within this consortium.
• ENSA Paris La Villette — Incubateur Banc d'Essai(s)minorStrategic or Co-development PartnerAlt participates as a tutoring agency in the ENSA Paris La Villette's 'Banc d'Essai(s)' incubator, accompanying three emerging businesses in 2025–2026: Ankr, Emilien Cristia, and 9000 Lieux. This is a knowledge-sharing and mentorship role.
• Filière Hors-site FranceminorStrategic or Co-development PartnerAlt became a member of Filière Hors-site France association in February 2025, which aims to raise awareness, provide training, and support skills development among off-site construction sector actors.
• 22°paysage, ETC (mobilité), Nicolas Associés SARL (VRD)majorStrategic or Co-development PartnerAlt is mandataire of the groupement for the Lorient Agglomération entry of agglomeration study. The consortium includes 22°paysage (landscape), ETC (mobility), and Nicolas Associés SARL (VRD infrastructure). Alt leads the multidisciplinary team delivering the master plan for Lanester entry.
• Edil Construction, Ossabois, Ethic, GERA'niummajorImplementation/ SI/ Consulting PartnerWithin the Batigère 'Construire Autrement' framework agreement, the team is led by Edil Construction and integrates Ossabois (off-site construction manufacturer), Ethic, and GERA'nium alongside alt and Virtuel Architecture. This is an off-site construction supply chain partnership.

Scale indicators4 records

Recent moves6 records

Expansion highlights5 records

Others

• Filiere Hors-site France: French industry association promoting off-site construction skills, training, and supply-chain development. Relevant as an ecosystem participant rather than a competitor: alt is a member and the TTU system fits directly into the off-site construction category the association advances.

Broad incumbents

• Wilmotte & Associés: Established French architecture and urban planning firm with deep experience in mixed-use, cultural, and urban regeneration projects. Comparable on the urban planning + architecture integration and French-market focus, but operating at much larger scale and broader scope.
• Architecture-Studio: Major French architecture firm with international reach, working across cultural, urban, and residential programs. Comparable as a French architectural practice operating at the architecture-urbanism intersection, but with significantly larger scale and broader portfolio than alt.

Emerging players

• Bond Society: Young French architecture and research practice working on urban transitions, reuse, and climate adaptation. Comparable to alt on the research-led, sustainability-focused practice profile, though with a stronger emphasis on reuse / adaptive transformation.

Regional players

• DGT Architects: Amsterdam- and Paris-based architecture firm focused on sustainable and community-led projects, with growing French footprint. Comparable on the participatory, sustainability-driven architecture approach, though operating primarily from the Netherlands rather than France.

Direct peers

• TVK: Paris-based architecture and urban planning firm working at metropolitan and territorial scales with a research-led approach. Directly comparable to alt on the urbanism / architecture axis, multiscalar methodology, and public-sector commissions in France.
• Fabrique Architectures Urbaines: Paris-based architecture and urban planning practice combining architectural design with strategic urban thinking, often for public-sector clients. Closely comparable to alt's multiscalar (architecture ↔ urbanism ↔ territory) positioning and French public-sector portfolio.
• ECDM Architectes: French architecture firm with parallel practices in architecture, urban planning, and research, including teaching at ENSA Paris-Belleville. Comparable to alt on the practice-research dual model, mid-sized French studio structure, and social-housing portfolio.
• Encore Heureux: Paris-based architecture studio focused on social, ecological, and low-cost construction with strong participatory practice. Closely comparable to alt in scale, mission (architecture serving the common good), emphasis on biosourced and reversible materials, and French public-sector client base.
• Atelier Architecture & Ingénierie (AAI): French architecture practice with active engagement in social housing, public facilities, and modular construction in Île-de-France. Comparable to alt in scale, geography, client mix, and exposure to French social-housing procurement.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/alt-architecture-lien-territoire
• Instagraminstagram.com/alt_au

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 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 alt - architecture lien territoire