What OMNIA - Ingénierie & Numérique does

ALTEREA, operating under the corporate identifier OMNIA - Ingénierie & Numérique, is a France-based energy performance and environmental engineering consultancy headquartered in Nantes. The firm delivers two core service lines — Assistance à Maîtrise d'Ouvrage (AMO, project advisory) and Maîtrise d'Œuvre (MOE, full engineering design and construction supervision) — covering the building lifecycle from audit and feasibility through to construction monitoring, acceptance and performance guarantees. Specialist expertise includes Décret Tertiaire compliance, energy audits, energy management, Environmental Performance Contracts (Contrat de Performance Energétique), environmental engineering, Schéma Directeur Energie and Garantie de Performance Energétique. The firm is part of the broader ALTYN group, which encompasses sister entities ALTYN (energy management), A2MO (project assistance), BECIA, DUJARDIN, ALTERESCO, AVELTYS and CYRISEA (cybersecurity/digital trust).

The company serves five primary segments: social housing providers (bailleurs sociaux), residential co-ownerships, public tertiary institutions, private tertiary building owners and operators (offices, retail, hotels, industrial, logistics, education), and healthcare facilities subject to stringent 24/7 operational requirements. Engagement is delivered through direct consulting mandates and via awarded public procurement framework agreements with UGAP (the central French public procurement body) and SIPPEREC (a local-authority procurement cooperative), providing structured access to public-sector capex.

Go-to-market is enterprise field sales backed by thought-leadership content on regulatory compliance and newsletter-driven nurture. Revenue mechanics are project-based professional services billed against framework agreements and direct quotations; pricing is not publicly disclosed. Per the input, 25 employees are attributed to the entity, the operating footprint is single-country (France), and no revenue, funding, M&A or leadership data has been disclosed.

Name

OMNIA - Ingénierie & Numérique

Legal name

ALTEREA

Website

https://omnia.xyz

Company type

Private

Operating status

Operating

Headcount range

11–50 employees

Short description

ALTEREA is a Nantes-based French energy performance and environmental engineering consultancy delivering AMO and MOE services across audit, design, construction monitoring and performance guarantees for social housing, public and private tertiary buildings, residential co-ownerships and healthcare facilities, primarily via direct consulting and public procurement framework agreements.

Ownership category

akta.pro rank

Product category

Energy Engineering Consulting

NAICS

Engineering Services (54133), Environmental Consulting Services (541620), Environmental Consulting Services (54162), Architectural, Engineering, and Related Services (5413)

SIC

Services-Engineering Services (8711), Services-Engineering, Accounting, Research, Management (8700), Services-Management Consulting Services (8742)

akta.pro primary industry

Energy & Sustainability Management (Energy Audits/Optimization/Carbon & ESG Programs) (IMAIAAAM)

akta.pro secondary industries

Asset Management & Owner’s Engineering (Lifecycle Strategy, Budgeting, Technical Due Diligence) (EUAMAGAJ), Environmental Impact Assessment (EIA) & Due Diligence (BPAHAJAB), Warranty, Service Contracts & OEM Relationship Management (Claims, SLAs, Performance Guarantees) (EUAMAGAO), Operational Controls, SOPs & Environmental Work Instructions (EUAHAIAJ)

Keywords

• Energy performance engineering
• Environmental consulting services
• Building energy audits
• Energy performance contracts
• Energy management consulting

Headquarters

HQ city

Nantes

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

Revenue model

1. Assistance à Maîtrise d'Ouvrage (AMO): Project management and technical advisory services for construction and renovation projects, supporting clients through the full project lifecycle from audit to completion
2. Maîtrise d'Œuvre (MOE): Complete engineering and design services for constructing and rehabilitating buildings with guaranteed energy performance
3. Accord-cadre public: Public procurement framework agreements with institutional clients (UGAP, SIPPEREC) for ongoing engineering services

Go-to-market motion1 record

Distribution channels3 records

Marketing channels3 records

Core offering

OMNIA - Ingénierie & Numérique (operating under the ALTEREA brand) provides energy performance engineering and environmental consulting services for buildings, cities, and territories. The offering is built around two core service lines: Assistance à Maîtrise d'Ouvrage (AMO) for project support from audit through delivery, and Maîtrise d'Œuvre (MOE) for complete engineering and design of construction and rehabilitation projects with guaranteed energy performance. Services include energy audits, Décret Tertiaire compliance, Energy Performance Contracts (CPE), environmental engineering, master energy planning, and energy performance guarantees, delivered to social housing, residential co-ownership, public/private tertiary, and healthcare sector clients in France.

Product overview

ALTEREA is a multi-disciplinary engineering group organized around two core service lines — Assistance à Maîtrise d'Ouvrage (AMO) and Maîtrise d'Œuvre (MOE) — supported by a portfolio of specialized subsidiaries and brands including ALTYN (energy management), A2MO (project assistance), BECIA, DUJARDIN, ALTERESCO, AVELTYS, and CYRISEA. The group serves social housing providers, residential co-ownerships, public and private tertiary buildings, and healthcare facilities, delivering expertise across energy audits, energy performance contracts, environmental engineering, energy master planning, and digital/cybersecurity services. The company operates under the broader ALTYN group umbrella and holds public procurement framework agreements such as UGAP and SIPPEREC.

Differentiator

Problem solved

Functional benefit

Products and services

• Assistance à Maîtrise d'Ouvrage (AMO) Project support service helping clients carry out rehabilitation and construction projects to the highest level of energy and environmental performance, from audit and design through to work supervision and acceptance. Targeted at social housing providers, residential co-ownerships, public and private tertiary building owners, and healthcare facilities.
• Maîtrise d'Œuvre (MOE) Complete and innovative engineering service for designing and rehabilitating buildings while guaranteeing their performance, covering the full project lifecycle from conception to delivery. Targeted at building owners and operators across social housing, residential, public/private tertiary, and healthcare sectors.

Named customers2 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

Feature7 records

Partnerships

Nine partnerships are on record, tiered core and minor.

• UGAPcoreChannel Partner/ Reseller/ DistributorALTEREA is an attributaire (awarded holder) of framework agreements with UGAP, the French central public procurement body, enabling access to public sector contracts for engineering services.
• SIPPERECcoreChannel Partner/ Reseller/ DistributorALTEREA is an attributaire (awarded holder) of framework agreements with SIPPEREC, a public procurement cooperative for local authorities, enabling access to regional public sector engineering contracts.
• ALTYN GroupcoreStrategic or Co-development PartnerALTEREA is part of the ALTYN Group, a multidisciplinary engineering group providing comprehensive services in energy performance, environmental engineering, and digital solutions for buildings and territories.
• A2MOminorOthersSubsidiary company of ALTYN Group, part of the broader service offering ecosystem.
• BECIAminorOthersSubsidiary company of ALTYN Group, part of the broader service offering ecosystem.
• DUJARDINminorOthersSubsidiary company of ALTYN Group, part of the broader service offering ecosystem.
• ALTERESCOminorOthersSubsidiary company of ALTYN Group, part of the broader service offering ecosystem.
• AVELTYSminorOthersSubsidiary company of ALTYN Group, part of the broader service offering ecosystem.
• CYRISEAminorOthersSubsidiary company of ALTYN Group, part of the broader service offering ecosystem.

Scale indicators1 record

Recent moves5 records

Expansion highlights4 records

Broad incumbents

• Egis: Large French engineering firm with energy, environmental and building performance services for public infrastructure and tertiary clients, comparable scope but at much greater scale.
• Bureau Veritas: Global testing, inspection and certification giant with a sizeable French building energy/environmental compliance practice serving similar regulatory-driven mandates.
• ENGIE Solutions: Large French energy services arm of ENGIE providing facility energy management, CPE contracts and HVAC optimization for tertiary and public buildings.
• Dalkia: Major French energy services provider delivering HVAC, energy performance contracts and facility optimization for public and private tertiary buildings.
• ARTELIA: Major French engineering group providing multi-disciplinary building, energy and environmental consulting to public and private clients, overlapping in MOE and energy performance work.

Emerging players

• EnerBIM: French energy and environmental engineering firm focused on building energy performance, audits and carbon strategies for real estate clients.

Direct peers

• Oteis: French engineering consultancy providing AMO/MOE, environmental and energy services for buildings, directly comparable in MOE and Décret Tertiaire advisory.
• Ginger Group (Burgeap): French engineering consultancy specializing in environmental, geotechnical and energy performance services, directly comparable in environmental consulting and EIA work.
• I Care & Consult: French environmental and energy consulting boutique focused on building energy efficiency, carbon strategy and ESG advisory for property owners and operators.
• Socotec: French engineering and compliance group offering energy audits, building performance, and environmental consulting services to public and private sector clients across similar verticals.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/omnia-ing%C3%A9nierie-et-num%C3%A9rique

Revenue estimate

Valuation estimate

Number of profiles

Subsidiaries7 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 OMNIA - Ingénierie & Numérique