123 Structure
123 Structure is a French structural engineering firm that delivers execution studies for individual residential houses in concrete, timber frame, and roof systems via an online quote-and-order platform, serving both individual homeowners and construction professionals across France and DOM-TOM.
- Company typePrivate
- Founded2020
- HeadquartersClisson, France
- Headcount11–50
- GTM typeB2B and B2C
- OfferingServices
What 123 Structure does
123 Structure SASU is a French structural engineering firm specializing in execution studies for individual residential construction, founded in 2020 in Clisson (Pays de la Loire) and operating as part of the Quarco collective of building and infrastructure engineering firms. The company produces structural execution studies across three core material lines — concrete/masonry (Étude structure maison individuelle béton/maçonnerie), wood frame (Étude structure maison ossature bois), and timber roof (Étude d'exécution charpente bois) — alongside seismic compliance certification aligned with Eurocode 8 and French zoning. A seismic study module and integration with external geotechnical bureaus extend the technical scope per project.
The commercial layer is a fully dematerialized online platform (app.123structure.fr) where customers complete a technical QCM, receive an instant quote, and place orders; studies are delivered within 15 working days. A separate PRO account serves construction professionals (architects, maîtres d'oeuvre, builders, material suppliers, masons, carpenters) with preferential pricing and order/invoice management. Pricing is per-study, starting from €614 HT (concrete, 90m² ground floor) and €378 HT (timber frame) for professionals, with complexity multipliers applied based on neighboring structures, foundation type, number of floors, total floor area, project type, and complementary roof studies.
The business model is project-based professional services revenue with a transactional digital front end. Distribution is exclusively digital direct across mainland France and DOM-TOM territories. Partnerships include ETIK Assurance (damage obraison insurance referrals), geotechnical engineering firms (G2 AVP/PRO soil studies as inputs), and AXA France (professional liability coverage). François-Xavier Guillard is identified as Director of Publication. The legal entity is a private SASU with €10,000 share capital, and no external funding rounds are disclosed.
123 Structure firmographics
Firmographics- Name
- 123 Structure
- Legal name
- 123 Structure SASU
- Website
- https://123structure.fr
- Company type
- Private
- Founded year
- 2020
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- 123 Structure is a French structural engineering firm that delivers execution studies for individual residential houses in concrete, timber frame, and roof systems via an online quote-and-order platform, serving both individual homeowners and construction professionals across France and DOM-TOM.
- Ownership category
- akta.pro rank
123 Structure industry classification
Industry- Product category
- Structural Engineering Services
- NAICS
- Architectural Services (541310), Architectural Services (54131), Services to Buildings and Dwellings (5617)
- SIC
- General Bldg Contractors - Residential Bldgs (1520)
- akta.pro primary industry
- Structural Expansion (Foundation, Framing & Load-Bearing Modifications) (HSAPADAN)
- akta.pro secondary industries
- Architectural Reconfiguration & Structural Alterations (HSAPAEAB), Load-Bearing Wall Removal & Structural Beam Installation (HSAPAFAB)
Keywords
Where 123 Structure is headquartered
LocationHeadquarters
- HQ city
- Clisson
- HQ country
- France
- HQ region
- Europe
Offices2 records
Markets served
123 Structure business model
Business model- GTM type
- B2B and B2C
- Offering type
- Services
- Cost components
- Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure, Others
Revenue model
- Structural study fees (concrete): One-time professional services fees for structural execution studies on masonry/concrete residential construction. Pricing starts from €614 HT for a ground floor concrete study of 90m² floor area (for registered professionals).
- Structural study fees (timber frame): One-time professional services fees for timber frame structural execution studies. Pricing starts from €378 HT for a ground floor timber frame house of 90m² floor area (for registered professionals).
- Timber roof/charpente structural studies: Dedicated structural execution studies for timber roof systems (charpente), including views, calculations, nomenclature, and detail plans.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Unit Pricing | Pay-as-you-go | Concrete structural study for individual house, starting from €614 HT |
| Unit Pricing | Pay-as-you-go | Timber frame structural study, starting from €378 HT |
| Unit Pricing | Pay-as-you-go | Project-specific pricing based on complexity factors |
Go-to-market motion2 records
Distribution channels2 records
Marketing channels3 records
123 Structure product offering
Product offeringCore offering
123 Structure provides structural execution studies (études d'exécution structure) for individual residential houses in France, covering concrete/masonry, timber frame (ossature bois), and roof/charpente construction. Customers obtain a quote in 3 minutes and place orders through a fully dematerialized online platform (app.123structure.fr), with studies delivered within 15 working days by a network of more than 100 French-qualified engineers. The offering is available both to individual homeowners (particuliers) and to construction professionals (architects, builders, material suppliers) via a dedicated PRO account, with service coverage across metropolitan France and DOM-TOM territories including seismic zones.
Product overview
123 Structure is a structural engineering firm specializing in execution studies for individual houses. The offering consists of a unified platform combined with specialized study services across three core product lines: (1) Étude structure béton/maçonnerie for concrete and masonry houses, (2) Étude structure maison ossature bois for wood frame houses, and (3) Étude charpente bois for wood frame roofs. Each study is paired with a seismic certification module and delivered through an online quotation and order management platform. Studies include technical documentation such as plans, calculations, nomenclature, and 3D views, and are available for new construction, extensions, renovations, and elevations.
Differentiator
Problem solved
Functional benefit
Products and services
- Étude structure maison individuelle (béton/maçonnerie) Structural execution study for individual houses in concrete or masonry, providing reinforced concrete element sizing, steel and concrete quantity calculations, color plan booklets with project elements, execution details, annotated 3D views, standard element details, and seismic certification. Targeted at individual homeowners and construction professionals building or extending single-family homes.
- Étude structure maison ossature bois Structural execution study for wood frame houses, including plan views, sections and details for wood element sizing, structural stability calculations, assembly calculations, seismic notice, load calculations, wood piece nomenclature, hardware nomenclature, and 3D views. Targeted at individual homeowners and construction professionals building timber frame homes.
- Étude d'exécution charpente bois Wood frame roof structural execution study adapting projects to architectural and regulatory constraints, including plan views, wood element calculations, structural stability, assembly calculations, seismic notice, and site consultations. Targeted at individual homeowners and construction professionals planning timber roof systems.
- Plateforme de devis en ligne Online platform for instant quote generation and study ordering. Customers complete a QCM questionnaire about their project characteristics and receive instant pricing, with orders deliverable as PDF studies within 15 working days. Supports both private individuals and professional accounts with order tracking, invoice history, and preferential PRO pricing.
Quantifiable outcome
- Studies delivered within 15 working days after order validation
- +3 more outcomes
Companies that use 123 Structure
Customer profileNamed customers2 records
Segments2 records
Ideal customer profiles2 records
123 Structure technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature3 records
123 Structure partnerships and signals
Strategic signalPartnerships
Four partnerships are on record, tiered minor and core.
- ETIK Assuranceminor123 Structure partnered with ETIK Assurance, a broker specializing in construction insurance, to offer damage obraison insurance (Assurance Dommages-ouvrage) to clients. This partnership simplifies administrative procedures for individual homeowners who need this mandatory insurance for renovation, elevation, or extension projects, and provides 123 Structure with a referral channel for construction clients.
- Collectif Quarcocore123 Structure is part of the Quarco collective, a network of companies specializing in building and infrastructure engineering. The collective includes other structural engineering firms (Abak Ingénierie, Grif Ingénierie) and provides a shared brand, expertise network, and cross-referral ecosystem. The collective represents over 20 years of combined engineering expertise.
- Geotechnical partners (bureaux d'études géotechniques)core123 Structure partners with geotechnical engineering firms (bureaux d'études géotechniques) to deliver soil studies (études de sol/études géotechniques) as an integral part of the structural study process. These partners provide G2 AVP and G2 PRO geotechnical reports that are essential inputs for structural calculations and seismic compliance.
- AXA Franceminor123 Structure declares being insured for the execution of its services with AXA France insurance company located in Couhé, ensuring professional liability coverage for its structural engineering deliverables.
Scale indicators4 records
Recent moves8 records
Expansion highlights5 records
123 Structure competitors and assessment
Company assessmentBroad incumbents
- Egis: Major French engineering firm offering structural, civil, and infrastructure engineering services. Comparable to 123 Structure in providing building engineering but serves a much broader project portfolio including transport, energy, and large-scale developments.
- APAVE: French group specializing in technical risk management, construction inspection, and building engineering services. Overlaps with 123 Structure's structural study and compliance offerings but operates across industrial, energy, and infrastructure sectors.
- Artelia: International engineering and project management group with strong French presence in building, structural, and infrastructure engineering. Comparable to 123 Structure in providing structural engineering services for buildings but at significantly larger scale and broader sector coverage.
- Ginger CEBTP: Large French engineering group specializing in geotechnical, structural, and construction engineering studies. Overlaps with 123 Structure in structural study services for buildings but operates at much greater scale and scope across infrastructure and commercial projects.
- Bureau Veritas: Global testing, inspection, and certification (TIC) giant with extensive French operations including construction and structural compliance services. Comparable to 123 Structure in delivering building-related structural and regulatory services but at vastly greater scale and broader industry coverage.
- Socotec: Major French TIC group providing construction technical control, structural studies, and regulatory compliance services. Directly competes with 123 Structure on building structural engineering while serving commercial, industrial, and infrastructure markets at much larger scale.
Direct peers
- Abak Ingénierie: French structural engineering firm (BET) explicitly named as a member of the Collectif Quarco alongside 123 Structure. Operates in the same building engineering domain, shares the collective's expertise network, and represents the most directly comparable business to 123 Structure.
- Grif Ingénierie: French structural engineering firm (BET) explicitly named as a member of the Collectif Quarco alongside 123 Structure. Closely comparable in scope, target market (French building and infrastructure), and operating model as a sister engineering firm within the same collective.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat5 records
Key risks5 records
Key highlights6 records
Customer concentration
123 Structure social profiles
Digital presence123 Structure financial estimates
Financial estimateRevenue estimate
Valuation estimate
123 Structure leadership team
Management profileNumber of profiles
Profiles1 record
123 Structure funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
123 Structure 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 123 Structure
What does 123 Structure do?
123 Structure provides structural execution studies (études d'exécution structure) for individual residential houses in France, covering concrete/masonry, timber frame (ossature bois), and roof/charpente construction. Customers obtain a quote in 3 minutes and place orders through a fully dematerialized online platform (app.123structure.fr), with studies delivered within 15 working days by a network of more than 100 French-qualified engineers. The offering is available both to individual homeowners (particuliers) and to construction professionals (architects, builders, material suppliers) via a dedicated PRO account, with service coverage across metropolitan France and DOM-TOM territories including seismic zones.
Is 123 Structure a public or private company?
123 Structure is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was 123 Structure founded?
123 Structure was founded in 2020. It employs 11 to 50 people.
Where is 123 Structure based?
123 Structure is headquartered in Clisson, France, in the Europe region.
How does 123 Structure make money?
Three revenue lines are on record. Structural study fees (concrete) is the primary driver. The others are structural study fees (timber frame) and timber roof/charpente structural studies.
Who are 123 Structure's main competitors?
Broad incumbents on record are Egis, APAVE, Artelia, Ginger CEBTP, Bureau Veritas and Socotec. Direct peers are Abak Ingénierie and Grif Ingénierie.
Does 123 Structure have an API?
No public API is recorded for 123 Structure.
What industry is 123 Structure in?
123 Structure's product category is Structural Engineering Services. Its primary akta.pro industry code is HSAPADAN, Structural Expansion (Foundation, Framing & Load-Bearing Modifications), with a secondary code of HSAPAEAB, Architectural Reconfiguration & Structural Alterations. Its NAICS code is 541310 and its SIC code is 1520.