# The 30 largest Construction companies in the Loire-Atlantique department

Tamtam tracks 57 Construction companies headquartered in the Loire-Atlantique department. This list ranks the 30 largest by number of employees on LinkedIn, led by GH | GIRARD HERVOUET Constructeur exigeant et bienveillant, CMF GROUPE and Bouygues Bâtiment Grand Ouest. Their median headcount is 137. Half of them were founded in 1991 or later. The most common headquarters are Nantes (7), Saint-Herblain (4) and Bouguenais (2).

These construction companies in Loire-Atlantique include both general contractors and specialized firms. They range from large groups like GH | GIRARD HERVOUET, which handles metal framework and roofing, and CMF GROUPE, a specialist in greenhouses, to mid-sized companies. Bouygues Bâtiment Grand Ouest focuses on sustainable building and renovation, while Anvolia designs and maintains HVAC systems. BTP CFA Pays de la Loire is a training organization for building trades.

The companies are primarily based in and around Nantes, including Saint-Herblain and La Chapelle-sur-Erdre. Many of these firms, such as Groupe ETPO, founded in 1913, and CMF GROUPE, founded in 1962, have a long history, indicating an established construction sector in the region.

🇫🇷 Loire-Atlantique · 30 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [GH \| GIRARD HERVOUET Constructeur exigeant et bienveillant](https://www.tamtam.ai/c/gh-girard-hervouet-constructeur-exigeant-et-bienveillant) (g-h.fr)<br>Specializes in metal framework, roofing, aluminum joinery, and cladding for new builds and renovations across western France. | Construction | 🇫🇷 Clisson | 1,278 | 1966 |
| 2 | [CMF GROUPE](https://www.tamtam.ai/c/cmf-groupe) (cmf-groupe.com)<br>A leading industrial group specializing in constructing greenhouses, bioclimatic glass buildings for agriculture, research, retail, and international markets | Construction | 🇫🇷 Loireauxence | 651 | 1962 |
| 3 | [Bouygues Bâtiment Grand Ouest](https://www.tamtam.ai/c/bouygues-batiment-grand-ouest) (bouygues-batiment-grand-ouest.fr)<br>Construction and renovation of buildings and neighborhoods in Western France, focusing on sustainability, resource efficiency, and social responsibility. | Construction | 🇫🇷 Nantes | 642 |  |
| 4 | [Anvolia](https://www.tamtam.ai/c/anvolia) (anvolia.com)<br>Designs, installs, and maintains heating, air conditioning, and air treatment systems, managing energy for buildings across their entire lifecycle. | Construction | 🇫🇷 La Chapelle-sur-Erdre | 392 | 1991 |
| 5 | [BTP CFA Pays de la Loire](https://www.tamtam.ai/c/btp-cfa-pays-de-la-loire) (btpcfa-pdl.com)<br>A leading training organization in the building trades in Pays de la Loire, training over 5000 apprentices and continuing education students on 5 sites | Construction | 🇫🇷 Nantes | 343 | 2012 |
| 6 | [ALTEREA](https://www.tamtam.ai/c/alterea) (alterea.fr)<br>An all-trade and energy engineering company specializing in renovation, construction, and energy optimization projects across various sectors for over 10 years | Construction | 🇫🇷 Nantes | 318 | 2004 |
| 7 | [CHRONO Flex France](https://www.tamtam.ai/c/chrono-flex-france) (chronoflex.fr)<br>Providing on-site hydraulic emergency repairs, preventive maintenance, parts sales, centralized lubrication, filtration, fluid transfer, and component sales across France. | Construction | 🇫🇷 Saint-Herblain | 294 | 1995 |
| 8 | [Groupe ETPO](https://www.tamtam.ai/c/groupe-etpo) (groupe-etpo.fr)<br>Company specializing in maritime, river, civil engineering, building construction, and special repair works across France and internationally. | Construction | 🇫🇷 Saint-Herblain | 248 | 1913 |
| 9 | [Prolians Vama Docks](https://www.tamtam.ai/c/prolians-vama-docks) (prolians.fr)<br>Specializing in all construction trades, this company offers a wide range of supplies and services to support building professionals Their goal is to uphold industry expertise | Construction | 🇫🇷 Rezé | 207 |  |
| 10 | [SOFRADI - Société Française d'Isolation - Créateur de Solutions Isolantes](https://www.tamtam.ai/c/sofradi-societe-francaise-d-isolation-createur-de-solutions-isolantes) (sofradi.fr)<br>A French company specializing in insulation for refrigeration, industry, facades, aluminum windows, and modular partitions, with a team of 220 professionals | Construction | 🇫🇷 Treillières | 206 | 1977 |
| 11 | [AGH Étaiement - Coffrage](https://www.tamtam.ai/c/agh-etaiement-coffrage) (agh-coffrage.fr)<br>Provides comprehensive horizontal formwork solutions for construction projects including housing, offices, industrial buildings, with expert teams and tailored logistics support. | Construction | 🇫🇷 Puceul | 184 | 2004 |
| 12 | [IBA - Ingénierie du bâtiment](https://www.tamtam.ai/c/iba-ingenierie-du-batiment) (iba-nantes.fr)<br>Specialized engineering firm offering building structural, fluid, and thermal design services, catering to regulations like seismic, fire safety, and energy efficiency | Construction | 🇫🇷 Vertou | 148 | 1984 |
| 13 | [ALTYN](https://www.tamtam.ai/c/altyn-nantes) (altyn-groupe.com)<br>Design, finance, and operate energy efficiency and decarbonization solutions for residential, commercial, and public building assets through specialized subsidiaries. | Construction | 🇫🇷 Nantes | 148 | 2022 |
| 14 | [GTM OUEST](https://www.tamtam.ai/c/gtm-ouest) (gtm-ouest.fr)<br>Local general contractor civil engineering industrial works Brittany Loire Pays. Design-build teams involved project upstream. Public or private tenders, general contractor or separate lots. | Construction | 🇫🇷 Saint-Herblain | 137 |  |
| 15 | [ATLANTIQUE OUVERTURES](https://www.tamtam.ai/c/atlantique-ouvertures) (atlantiqueouvertures.com)<br>Specializing in manufacturing and installing PVC and aluminum exterior joinery, this local company offers a range of quality products and services | Construction | 🇫🇷 Vigneux-de-Bretagne | 137 | 1986 |
| 16 | [ANDRE BTP](https://www.tamtam.ai/c/andre-btp) (andre-btp.com)<br>A construction company specializing in new construction, renovations, general contracting, and structural rehabilitation, focused on local subcontracting and economic development | Construction | 🇫🇷 Nantes | 109 | 1836 |
| 17 | [Monnier](https://www.tamtam.ai/c/monnier) (monnier-energies.com)<br>Specializing in electrical installations, automation projects, and energy efficiency solutions with over 90 years of experience in various sectors including high and low voltage distribution | Construction | 🇫🇷 Ancenis-Saint-Géréon | 106 | 1923 |
| 18 | [Macoretz scop](https://www.tamtam.ai/c/macoretz-scop) (macoretz.fr)<br>General building company specializing in custom projects, housing improvements, real estate offers, and individual home construction with sustainable solutions. | Construction | 🇫🇷 Saint-Père-en-Retz | 103 | 1986 |
| 19 | [CETIH Renov](https://www.tamtam.ai/c/cetih-renov) (cetih-renov.fr)<br>Specializes in residential home improvement and renovation through three brands, serving customers across western France with 200 employees. | Construction | 🇫🇷 Bouguenais | 94 | 1997 |
| 20 | [ACTIV TRAVAUX France](https://www.tamtam.ai/c/activ-travaux-france) (activ-travaux.com)<br>National leader in renovation services, offering a comprehensive, streamlined process from project conception to completion Franchise opportunities available for entrepreneurs in France | Construction | 🇫🇷 Carquefou | 84 | 2005 |
| 21 | [GROUPE LE FEUNTEUN](https://www.tamtam.ai/c/groupe-le-feunteun) (groupe-lefeunteun.com)<br>A construction group specializing in residential and public infrastructure projects, providing design, construction, and general contracting services with in-house resources and expertise | Construction | 🇫🇷 Malville | 82 |  |
| 22 | [ATIB](https://www.tamtam.ai/c/atib) (atib.fr)<br>Specialized supplier of ventilation and air treatment equipment, providing innovative products focused on energy savings, air quality, and comfort. | Construction | 🇫🇷 Sainte-Luce-sur-Loire | 77 | 1973 |
| 23 | [Groupe Landais](https://www.tamtam.ai/c/groupe-landais) (groupelandais.com)<br>A company specializing in comprehensive public works services, including road construction, urban development, landscaping, and environmental impact management in western France | Construction | 🇫🇷 Mésanger | 67 | 1958 |
| 24 | [L2A Agencement](https://www.tamtam.ai/c/l2a-agencement) (l2a-agencement.com)<br>General contracting and bespoke furniture manufacturing for luxury, retail, corporate, hospitality, childcare, banking, healthcare sectors with French craftsmanship. | Construction | 🇫🇷 Basse-Goulaine | 61 | 2007 |
| 25 | [Neovivo](https://www.tamtam.ai/c/neovivo) (neovivo.fr)<br>Specializing in overall home improvement, Neovivo offers innovative solutions to enhance air, water, heating, and insulation quality for a healthier and safer living environment | Construction | 🇫🇷 Bouguenais | 58 |  |
| 26 | [CEGELEC Nantes Tertiaire](https://www.tamtam.ai/c/cegelec-nantes-tertiaire) (cegelec-pays-de-la-loire.fr)<br>Expert in electrical installations in Nantes, offering tailored solutions for large and small-scale projects, focusing on energy efficiency in various sectors | Construction | 🇫🇷 Carquefou | 51 |  |
| 27 | [GROUPE ASCIA](https://www.tamtam.ai/c/groupe-ascia) (groupeascia.fr)<br>ASCIA Group consists of 4 local engineering companies specializing in architectural engineering, construction economics, and renovation using advanced equipment | Construction | 🇫🇷 Haute-Goulaine | 48 | 2009 |
| 28 | [ED Ouest Couverture](https://www.tamtam.ai/c/ed-ouest-couverture) (ed-ouest.fr)<br>Providing professional roofing renovation services with personalized diagnostics, quality commitments, and local presence in the Grand-Ouest region. | Construction | 🇫🇷 Nantes | 48 | 2014 |
| 29 | [Emenda!](https://www.tamtam.ai/c/emenda) (emenda.fr)<br>EMENDA is an engineering company specializing in thermal and fluid dynamics applied to various sectors, offering energy efficiency solutions and environmental services internationally | Construction | 🇫🇷 Saint-Herblain | 47 | 2012 |
| 30 | [ANDRE BTP](https://www.tamtam.ai/c/andre-btp-nantes) (andre-btp.com)<br>Construction company based in Nantes, France, specializing in various construction services such as building, renovation, and infrastructure development | Construction | 🇫🇷 Nantes | 45 |  |

## How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 11, 2026.

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Source: https://www.tamtam.ai/l/construction-companies-loire-atlantique