Alterea Group

What Alterea Group does

ALTEREA is a France-based energy engineering and consulting firm founded in 2004 by Alban LAPIERRE and headquartered in Nantes, operating across 8 agencies (Paris, Lille, Bordeaux, Lyon, Strasbourg, Marseille, Toulouse) organized into three regional directions (Grand-Ouest, Île-de-France, Nord-Est/Sud-Est/Sud-Ouest). The firm delivers Assistance à Maîtrise d'Ouvrage (AMO) and Maîtrise d'Œuvre (MOE) services across the full building lifecycle, covering energy rehabilitation, regulatory compliance (Décret Tertiaire, Décret BACS, RE2020), energy audits, BEGES carbon assessments, PCAET territorial climate plans, Schéma Directeur Énergie (SDE) master planning, and a distinctive Garantie de Performance Énergétique Réelle (GPE-R) warranty product that guarantees measured real-world performance outcomes over multi-decade horizons. A sub-brand, OMNIA Numérique, provides dedicated BIM/CIM digital engineering services (strategy consulting, AMO, management, synthesis) for clients digitalizing building and territorial data.

The firm's customer base spans five activity domains — social housing (bailleurs sociaux including Tarn Habitat, ICF Habitat), residential co-ownerships, public tertiary (Mairie de Toulouse, Ville de Laval, Ville de Bourges, Guingamp-Paimpol Agglomération, Nantes Université, IMT), private tertiary (Crédit Agricole, E.Leclerc, ARGAN, IBM, Hermès, Accor, HSBC), and healthcare (CHU de Nantes, CPAM 93). Access to French public-sector contracts is structurally enabled through attributaire status on UGAP and SIPPEREC framework agreements. Since joining the ALTYN group in 2019 as its flagship subsidiary alongside six other entities (A2MO, BECIA, DUJARDIN, CYRISEA, AVELTYS, ALTERESCO), ALTEREA has been positioned to deliver integrated engineering-to-contracting services across the building value chain.

Revenue is generated through project-based engineering and consulting engagements — negotiated contracts and competitive tenders on public procurement frameworks — with pricing determined per project. In 2022 ALTEREA became a société à mission with four ESG commitments aligned to France's National Low-Carbon Strategy and the UN SDGs, and holds LUCIE 26000 certification (864/1000). In November 2024 the firm relocated to the new AURORE headquarters in Nantes, and in January 2026 appointed Cyril VILLEMAIN as Directeur Général alongside a stated strategic reorganization for 2026.

Name

Alterea Group

Legal name

ALTEREA

Website

https://alterea.fr

Company type

Private

Founded year

2004

Operating status

Operating

Headcount range

251–500 employees

Short description

ALTEREA is a French energy engineering and consulting firm founded in 2004, delivering AMO/MOE services, regulatory compliance (Décret Tertiaire, BACS, RE2020), energy audits, BEGES carbon assessments, BIM/CIM digital engineering, and GPE-R performance guarantees to public and private property owners across 8 French agencies.

Ownership category

akta.pro rank

Product category

Energy Engineering and Building Performance Consulting

NAICS

Architectural, Engineering, and Related Services (5413), Environmental Consulting Services (54162), Environmental Consulting Services (541620)

SIC

Services-Engineering Services (8711)

akta.pro primary industry

Energy Systems & Power Engineering Consulting (BPAHAIAG)

akta.pro secondary industries

Asset Management & Owner’s Engineering (Lifecycle Strategy, Budgeting, Technical Due Diligence) (EUAMAGAJ), Construction Management & General Contracting (EPCM, Scheduling, QA/QC, HSE) (EUAMAFAJ), EMS Integration (ISO 9001/45001/50001) & Integrated Management Systems (EUAHAIAC), Climate Change Mitigation/Adaptation & Natural Resource Management Technical Assistance (BPADAEAJ)

Keywords

• Energy engineering services
• Building rehabilitation consulting
• Energy performance audits
• BIM CIM digital engineering
• Environmental engineering planning

Headquarters

HQ city

Nantes

HQ country

France

HQ region

Europe

Offices8 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Engineering and Consulting Services: ALTEREA generates revenue through project-based engineering and consulting engagements. Services include Assistance à Maîtrise d'Ouvrage (AMO), Maîtrise d'Œuvre (MOE), energy audits, BEGES, PCAET, SDE, BIM/CIM management, and environmental engineering. Revenue is generated through negotiated contracts and public procurement framework agreements (UGAP, SIPPEREC).

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels6 records

Core offering

ALTEREA is a French energy engineering and consulting firm offering Assistance à Maîtrise d'Ouvrage (AMO) and Maîtrise d'Œuvre (MOE) services for the energy rehabilitation and sustainable construction of buildings. The firm delivers energy audits, environmental engineering (BEGES, PCAET, SDE), regulatory compliance (Décret Tertiaire, RE2020, BACS), and a Guaranteed Real Performance Energy (GPE-R) warranty on its projects. Its OMNIA Numérique sub-brand provides BIM/CIM digital engineering services across the building lifecycle.

Product overview

ALTEREA is an energy engineering firm that offers a portfolio of consulting and engineering services organized around two core métiers: Assistance à Maîtrise d'Ouvrage (AMO) and Maîtrise d'Œuvre (MOE). The company provides specialized services including energy management, regulatory audits (Décret tertiaire, audit énergétique réglementaire), environmental engineering (BEGES, PCAET), and energy rehabilitation. A distinct sub-brand, OMNIA Numérique, provides BIM/CIM digital engineering services including consulting, AMO, management, and synthesis modules. The GPE-R (Garantie de Performance Énergétique Réelle) offers guaranteed energy savings. ALTEREA operates across five activity domains: social housing, residential housing, public tertiary, private tertiary, and healthcare.

Differentiator

Problem solved

Functional benefit

Products and services

• Assistance à Maîtrise d'Ouvrage (AMO) Project support service for rehabilitation and construction projects, targeting the best level of energy and environmental performance for clients. Used by social landlords, public entities, and private property owners.
• Maîtrise d'Œuvre (MOE) Complete and innovative engineering services to design and rehabilitate buildings while guaranteeing performance. Covers all phases from design to works supervision for energy rehabilitation and new construction.
• Management de l'énergie Energy management services to improve energy performance and reduce consumption in buildings and property portfolios.
• Audit énergétique réglementaire (entreprises) Regulatory energy audits for large enterprises required by French law DDAUE (Directive 2012/27/EU), analyzing energy consumption across buildings, industrial processes, equipment (lifts, lighting, security), and vehicle fleets per ADEME specifications.
• Audit énergétique réglementaire (copropriétés) Regulatory energy audit for residential co-ownerships required when selling properties rated E, F, or G, providing a comprehensive analysis of the building's energy performance and improvement pathways.
• Décret tertiaire compliance services Compliance services for the French Tertiary Decree requiring energy consumption reduction in tertiary sector buildings, supporting owners and operators in achieving regulatory targets.
• Schéma Directeur Énergie (SDE) Energy master plan services for buildings and territories establishing long-term energy strategy, efficiency priorities, renewable production targets, and implementation mechanisms.
• Contrat de Performance Énergétique (CPE) Energy performance contracts guaranteeing measurable energy savings over a defined period for client buildings and facilities.
• Réhabilitation énergétique Energy rehabilitation services for existing buildings to improve performance, reduce consumption, and decrease environmental footprint through heating, ventilation, air conditioning, lighting, and envelope improvements.
• Garantie de Performance Énergétique Réelle (GPE-R) Real energy performance guarantee service ensuring measurable energy savings over 30 years, backed by guaranteed measured outcomes rather than theoretical projections.
• Ingénierie Environnementale (BEGES, PCAET) Environmental engineering services including BEGES carbon balance assessments (Scopes 1, 2, 3), PCAET Territorial Climate-Air-Energy Plans, and territorial energy master plans.
• OMNIA Numérique (BIM/CIM Services) Specialized brand for BIM (Building Information Modeling) and CIM (City Information Modeling) services including strategy consulting, AMO, BIM/CIM management, and synthesis for collaborative 3D digital modeling across the building lifecycle.

Quantifiable outcome

• 93% client satisfaction index (2024)
• +3 more outcomes

Named customers18 records

Segments5 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

Eight partnerships are on record, tiered core and minor.

• UGAP (Union des Groupements d'Achats Publics)coreChannel Partner/ Reseller/ DistributorALTEREA is attributaire (awarded holder) of UGAP framework agreements, enabling the French government's central purchasing body to provide ALTEREA's engineering and consulting services to public sector clients nationwide.
• SIPPEREC (Syndicat Intercommunal de la Périphérie de Paris pour l'Énergie et les Communications)coreChannel Partner/ Reseller/ DistributorALTEREA is attributaire of SIPPEREC framework agreements, providing preferential access to public procurement contracts for municipalities and public institutions in the Île-de-France region. ALTEREA co-organized the Challenge Décret Tertiaire with SIPPEREC.
• ALTYN GroupcoreStrategic or Co-development PartnerALTEREA joined ALTYN in 2019. ALTYN is an independent group engaged in consulting, engineering, services, and works related to energy, environmental, and digital transition. The group comprises 7 subsidiaries covering the entire building value chain: ALTEREA, A2MO, BECIA, DUJARDIN, CYRISEA, AVELTYS, and ALTERESCO. ALTEREA is the flagship entity of the group.
• A2MOminorOthersA2MO is a subsidiary of ALTYN group, operating alongside ALTEREA. The nature of the A2MO relationship is group-internal collaboration within the ALTYN ecosystem.
• ALTERESCOminorOthersALTERESCO is a subsidiary of ALTYN group. ALTEREA's GPE-R warranty product is also delivered through ALTERESCO contracting capabilities. The nature of the relationship is group-internal collaboration within the ALTYN ecosystem.
• OMNIA NumériqueminorOthersOMNIA Numérique is ALTEREA's specialized internal brand for BIM/CIM services. It operates as an integrated offering within ALTEREA's service portfolio rather than a separate entity.
• Fresque du ClimatminorStrategic or Co-development PartnerALTEREA's environmental engineering team includes certified facilitators of the Fresque du Climat (Climate Fresk) workshop, a collaborative climate education tool. This partnership supports ALTEREA's awareness and training activities for clients.
• Atelier 2tonnesminorStrategic or Co-development PartnerALTEREA's environmental engineering team includes certified facilitators of the Atelier 2tonnes, a climate awareness tool complementary to the Fresque du Climat. Used during BEGES, PCAET, and sensitization missions.

Scale indicators6 records

Recent moves7 records

Expansion highlights6 records

Direct peers

• Artelia: France-headquartered independent engineering group offering energy, building, and environmental consulting across construction and rehabilitation. Closely comparable to Alterea in service scope (AMO/MOE, energy audits, environmental studies) and customer base in French social housing and public tertiary, but at significantly larger scale with international presence.
• Egis: Major French engineering and consulting firm with deep building, energy, and environmental practices. Competes directly with Alterea for public-sector framework agreements and AMO/MOE engagements in social housing and tertiary, with broader infrastructure reach across transport and urban development.
• setec: Independent French engineering consultancy with strong building, energy, and environmental divisions. Comparable to Alterea in technical AMO/MOE services, BIM expertise, and focus on complex rehabilitation and energy performance projects for public and private clients.
• Manergy: French pure-play energy and environmental engineering consultancy focused on building performance, decarbonization, and AMO/MOE for real estate. Closely comparable to Alterea in service portfolio, customer types (social landlords, tertiaire), and mid-sized national footprint.
• Greenflex: French consultancy specialized in energy transition, carbon strategy, and sustainable building advisory. Directly comparable to Alterea's environmental engineering (BEGES, PCAET) and energy performance offerings, with overlap in CSR-driven public and private client engagements.
• Elan: French engineering consultancy providing energy, environmental, and technical building services. Comparable to Alterea across regulatory audits, PCAET, and rehabilitation engineering for social housing and public-sector clients in France.
• Ingénierie et Conseil (IC) Group / Naldeo: French independent engineering group with strong building, energy, and infrastructure practices. Comparable to Alterea in AMO/MOE, energy audits, and territorial energy planning, with similar mid-size positioning and public-sector exposure.

Broad incumbents

• Bureau Veritas: Global testing, inspection, and certification leader that also delivers building energy audits, ESG, and asset integrity services. Comparable to Alterea in regulatory energy audits (Décret Tertiaire) and ESG advisory, but operates at much larger scale across diversified TIC services rather than pure-play energy engineering.
• Socotec: Major French TIC firm with energy, environmental, and building performance practices. Comparable to Alterea in regulatory audits, BEGES/carbon, and energy compliance work, but with broader risk-management and infrastructure services beyond pure consulting.
• Afry (formerly Pöyry): European engineering and design consultancy with energy, building, and sustainability practices. Comparable to Alterea in energy transition consulting and rehabilitation engineering, but at significantly larger scale with international footprint.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/channel/UCnGXjz9VzVjMqqD6GvLRjKw
• Xx.com/alterea_
• LinkedInlinkedin.com/company/alterea

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 records

Subsidiaries1 record

Funding overview

Funding rounds1 record

Investors1 record

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 Alterea Group