B3I

What B3I does

B3I is a privately held French engineering consultancy (bureau d'études) specializing in VRD — Voirie et Réseaux Divers — the design and construction supervision of road infrastructure, utility networks (water, sanitation, electricity, telecom, gas), and associated public works. Founded around 1998 and headquartered at 105 Rue de Siam in Brest with a secondary office in Rennes, the firm operates across four competency poles: urbanisme (urban planner plus VRD/topographer draughtsman), transport (VRD engineer), numérique & reprographie (draughtsman/projeteur), and travaux (two works supervisors), totaling roughly six to seven staff. Its service portfolio covers the full project lifecycle — preliminary and detailed studies (ESQ, APS, APD, Pro GHB), hydraulic notices, procurement dossiers, contract assistance (ACT/DET), construction-phase management, and infrastructure diagnostics for roads, sanitation, and dry networks.

B3I's revenue model is professional-services fees on public-sector mandates, with disclosed project values ranging from €150,000 (parking at Lycée Henri Avril, Lamballe) to €626,000 (sanitation and potable-water network renewal at Brasparts). Customers are exclusively French public entities — municipalities, communauté de communes, and the Région Bretagne — and mandates are won via public procurement processes (Maîtrise d'oeuvre VRD). Construction-supervision work is concentrated in northwest France, while engineering studies are offered nationwide. The firm is one of five engineering offices within the Building Management Group, which bundles complementary disciplines (project management, construction economics, architecture, general contracting, coordination and safety) under a shared commercial front. No funding rounds, acquisitions, AI capabilities, patents, or management-team disclosures are recorded in the available sources; the legal publisher of the website is listed as LECLERC Gary (Association) based in Beauvais, though ownership percentages and investor structure are not disclosed.

Name

B3I

Legal name

LECLERC Gary (Association)

Website

https://b3i.fr

Company type

Private

Founded year

1998

Operating status

Operating

Headcount range

1–10 employees

Short description

B3I is a small French VRD engineering consultancy based in Brest (with a Rennes office), specializing in road, utility-network, and public-infrastructure design plus construction supervision for municipalities and the Région Bretagne. It operates as one of five bureaux d'études within the Building Management Group.

Ownership category

akta.pro rank

Headquarters

HQ city

Brest

HQ country

France

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Engineering Studies & Project Management: Professional services fees for VRD engineering studies, master planning, hydraulic studies, and construction supervision. Project-based fees ranging from 150,000€ to 626,000€ per project based on disclosed works.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels1 record

Core offering

B3I is a civil engineering consultancy specializing in VRD (Voirie et Réseaux Divers) — road works and diverse networks. It delivers end-to-end infrastructure services for public-sector clients, from preliminary and detailed project studies (ESQ, APS, APD, Pro GHB) through hydraulic analyses, procurement documentation, contract assistance, and on-site construction supervision for road, sanitation, water, electricity, gas, and drainage networks.

Product overview

B3I is a civil engineering consultancy offering a unified portfolio of infrastructure services centered on VRD (roadwork and utility networks). The core offering combines technical studies (ESQ, APS, APD phases), contract assistance, and construction phase management. The company operates through four specialized poles: urban planning, transport engineering, digital/reprography, and construction works, providing integrated project support from initial studies through to site completion. Recent projects include sewage pumping stations, network renewal, and cycling infrastructure across Brittany.

Differentiator

Problem solved

Functional benefit

Products and services

• VRD Engineering Consultancy (Voirie et Réseaux Divers) Full-lifecycle VRD engineering services for public-sector clients covering civil engineering of road infrastructure and utility networks (water, electricity, gas, sanitation, drainage), delivered through four specialized competency poles: urban planning, transport, digital/reprography, and construction works.
• Engineering Studies (Études ESQ, APS, APD, Pro GHB) and Hydraulic Notices Preliminary and detailed project design studies for VRD construction projects, including ESQ (schematic), APS (preliminary design), APD (detailed design), Pro GHB (project specification for building permits equivalent), and hydraulic notices required before construction.
• Public Procurement Documentation and Contract Assistance (ACT, DET) Preparation of consultation dossiers for enterprises (DCE) and assistance during contract tendering and technical supervision of construction contracts, including ACT (assistance for contract award) and DET (technical direction of works) phases.
• Construction Phase Management (Maîtrise d'oeuvre, site coordination, works supervision) Full project management, site supervision (OPC - Ordonnancement, Pilotage et Coordination), and works coordination from conception through completion, delivered through the Pôle travaux by two works supervisors for site direction and quality control.
• Infrastructure Diagnostics for Roads, Sanitation and Dry Networks Diagnostic assessment services for road conditions, sanitation systems (eaux usées, eaux pluviales), and dry utility networks (réseaux secs) including electricity and telecom infrastructure.

Quantifiable outcome

• Projects completed across Brittany region including municipalities: Milizac, Brasparts, Crozon, Lamballe with values ranging from 150,000€ to 626,000€.

Named customers4 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

Feature3 records

Partnerships

One partnership is on record.

• Building Management GroupcoreStrategic or Co-development PartnerB3I is one of five engineering offices within the Building Management Group. The group comprises complementary poles: Maîtrise d'oeuvre (project management), Économie de la construction (construction economics), Architecture, Contractant Général (general contracting), and Coordination & Sécurité (coordination & safety). This structure enables B3I to access comprehensive infrastructure development services while maintaining independent operations.

Scale indicators4 records

Recent moves4 records

Expansion highlights4 records

Broad incumbents

• Egis: Egis is a major French engineering group with infrastructure, transport, water, and urban planning practices — competes for many of the same municipal mandates as B3I but at substantially larger scale.
• Artelia: Artelia is a leading French engineering consultancy covering infrastructure, water, environment, and urban development — competes in the same VRD/maîtrise d'œuvre space but as a much larger, multi-region player.
• Setec Group: Setec is a major French multi-disciplinary engineering group active in infrastructure, water, and urban projects — broader and larger than B3I but operating in the same VRD/maîtrise d'œuvre municipal market.
• Safege (Suez Consulting): Safege, the engineering consulting arm of Suez, is a French infrastructure and environmental engineering player active in water, sanitation, and urban infrastructure projects comparable to B3I's core scope.

Direct peers

• Oteis: Oteis is a French engineering group offering VRD, infrastructure, environment, and project management services — comparable in size and customer segments to B3I's Breton practice.
• Even Conseil: Even Conseil is a French bureau d'études specialising in VRD, hydraulics, and infrastructure engineering for local authorities — virtually identical service offering, customer base, and project scale to B3I.
• Altereo: Altereo is a French engineering firm specialising in water cycle, sanitation, and VRD infrastructure for local authorities — directly comparable to B3I's sanitation network and public-procurement focus.
• SCE (Groupe Keran): SCE is a French engineering consultancy specialising in water, environment, and urban infrastructure — overlapping with B3I's sanitation network, hydraulic, and urbanisme poles.
• Ingérop: Ingérop is a mid-sized French engineering group covering infrastructure, transport, water, and urban development — directly competitive with B3I on maîtrise d'œuvre VRD and transport pole engagements.
• Verdi Ingénierie: Verdi is a French engineering consultancy focused on VRD, environmental studies, and sustainable urban development for municipalities — same regulatory-adjacent VRD niche as B3I.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks5 records

Key highlights6 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

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 B3I