The companies listed are mid-sized and large firms in the construction sector, based in the Haute-Garonne department. They cover a range of specialized services within construction. For example, SEAC focuses on structural solutions and floor techniques, while DODIN CAMPENON BERNARD designs and manages complex infrastructure projects. AGTHERM specializes in climate engineering and energy performance, and SCAM TP provides water services.
A notable pattern is the concentration of headquarters in Toulouse, with companies like SEAC, DODIN CAMPENON BERNARD, OTCE, and BOURDARIOS located there. Other firms, such as GIRAUD and socotrap, are based in Ramonville-Saint-Agne. The companies generally have established histories, with many founded between the 1960s and 1990s.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
SEACseac-gf.fr
Specializing in structural solutions for buildings, focusing on floor techniques to meet RT2012 regulations Providing thermal, acoustic, and environmental benefits for various construction projects |
494 | |||
| 2 |
DODIN CAMPENON BERNARDdodincampenonbernard.fr
Designs, builds, and manages complex infrastructure projects: transport, hydraulic, environmental, energy, and functional structures, globally and locally. |
381 | |||
| 3 |
GIRAUDgiraudbtp.com
Construction company providing building and construction services based in Ramonville-Saint-Agne, Midi-Pyrénées, France region. |
271 | |||
| 4 | 203 | ||||
| 5 |
AGTHERMagtherm.com
Independent small-medium enterprise specializing in climate engineering and energy performance, offering work and maintenance services in tertiary, industrial, pharmaceutical, and hospital sectors. |
188 | |||
| 6 |
SCAM TPscam-tp.com
SCAM TP is an independent SME specialized in water services, including network construction, maintenance, and operation, with a focus on quality, safety, and sustainability |
164 | |||
| 7 |
GBMP Bâtimentgroupe-gb.fr
Provides general contracting, structural masonry, turnkey design-build services, building rehabilitation, and energy performance maintenance for residential, industrial, and tertiary sectors in the Occitanie region. |
142 | |||
| 8 |
BOURDARIOSfrance.vinci-construction.com
Building construction, renovation, and maintenance of various structures like offices, housing, hotels, and historic monuments, including asbestos removal and interior fit-outs. |
133 | |||
| 9 |
socotrapsocotrap.com
Regional SME with 60 years of experience in construction specializing in industrial buildings, housing, and public projects in Toulouse and surrounding region |
120 | |||
| 10 |
GIESPERgiesper.fr
GIESPER specializes in construction and real estate, with activities in public works, building, and real estate development |
114 | |||
| 11 |
Gregori Internationalgregori-international.com
A family-owned company with over 40 years experience in constructing high quality landscaping, sports fields, stadiums, equestrian grounds, and golf courses worldwide |
105 | |||
| 12 |
Groupe CLIMATERgroupe-climater.com
Design, maintain, and operate climate engineering installations for industry, healthcare, housing, commerce, offices, and public facilities with local autonomy. |
101 | |||
| 13 |
C2F Travaux ferroviaires
Specialists in railway catenary works and safety, prioritizing human values like trust, responsibility, and teamwork, for a strong company culture |
101 | |||
| 14 |
MATEOS ELECTRICITEmateos-elec.fr
A family-owned company in Toulouse and Bordeaux, providing tailored solutions for energy infrastructure, buildings, and commercial properties through a range of technical services |
91 | |||
| 15 |
Groupe GBgroupe-gb.fr
This company is an independent leader in construction and real estate in Occitania, providing comprehensive building services, interior design, and environmental solutions. |
85 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 16 |
Stibat Groupestibat.fr
Group of specialized construction entities focusing on building works, small renovations, deep foundations, and private housing renovations with strong team values. |
77 | |||
| 17 |
SOPRECO - Groupe Quatre +sopreco.fr
General building company specializing in construction, rehabilitation, and civil engineering with strong focus on quality, ethics, and client respect. |
73 | |||
| 18 |
Cegelec Occitanie Tertiairecegelec-occitanie-tertiaire.fr
Design and installation of electrical systems for buildings, supported by an in-house engineering office and experienced field teams. |
70 | |||
| 19 |
ROUZÈS GROUPErouzes.com
Designing and manufacturing adaptable partitions for office spaces, enhancing comfort, confidentiality, and modularity for evolving work environments. |
65 | |||
| 20 |
DEMATHIEU BARD CONSTRUCTION SUD-OUESTdemathieu-bard.fr
Conception, construction, and rehabilitation of residential, functional, and industrial buildings Implements innovative construction techniques and supports local resources Operates in Nouvelle Aquitaine and Occitanie |
62 | |||
| 21 |
SOCAT
A Toulouse-based independent company specializing in water and environmental construction, trusted by public and private clients for water infrastructure projects |
61 | |||
| 22 |
Tunzini Sud-Ouesttunzini-sudouest.fr
Design, implementation, and technical management of heating, ventilation, air treatment, energy production, plumbing, automation, and energy audits for various sectors. |
60 | |||
| 23 |
EXECOexe-eco.fr
Since 2013, we provide effective collaboration and professional support to architects and public/private clients in both project design and construction |
44 | |||
| 24 |
SCLE SYSTEMES POUR LE FERROVIAIRE ET L'ENERGIE, PAR ABREVIATION SCLE SFE
Construction company specializing in systems for railway and energy sectors located in Toulouse, France |
36 | |||
| 25 | 35 | ||||
| 26 |
Groupe CARRÉcarre-sa.com
The company specializes in metalwork, aluminum joinery, and locksmithing, offering a range of services including design, production, and maintenance for various projects |
29 | |||
| 27 |
Soconersoconer.fr
Since 2011, we help clients design energy solutions for buildings, focusing on efficiency, sustainability, comfort, and overall project success |
27 | |||
| 28 |
CONSTRUCTIONS SAINT-ELOI - Entreprise de Génie Métalliquesaint-eloi.eu
A company with 40 years of experience in tubular and three-dimensional metal construction, metalworking, and metal-textile structures with multiple locations across France |
25 | |||
| 29 |
Global Expertisesglobal-expertises.fr
A building and construction expert firm offering technical analysis of building issues, dispute resolution, renovation advice, and legal procedure support |
25 | |||
| 30 |
Les Couvreurs Occitanscouvreurs-occitans.fr
A team of roofers and solar panel installers in Toulouse dedicated to satisfying customers by doing what they love with an ethical approach |
24 | |||
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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.
More company lists in the Haute-Garonne department
- The largest companies in the Haute-Garonne department 2,406
- Companies with in-house R&D in the Haute-Garonne department 323
- Multinational companies in the Haute-Garonne department 246
- Retail chains in the Haute-Garonne department 222
- Professional services firms in the Haute-Garonne department 208
- Aerospace and defence companies in the Haute-Garonne department 186
- Manufacturers in the Haute-Garonne department 159
- IT services companies in the Haute-Garonne department 158
- IT Services and IT Consulting companies in the Haute-Garonne department 152
- SaaS companies in the Haute-Garonne department 147
- Consulting firms in the Haute-Garonne department 145
- Software Development companies in the Haute-Garonne department 140
- Hardware manufacturers in the Haute-Garonne department 137
- Public sector organisations in the Haute-Garonne department 111
- Business Consulting and Services companies in the Haute-Garonne department 104
- Real Estate companies in the Haute-Garonne department 104
- Aviation and Aerospace Component Manufacturing companies in the Haute-Garonne department 102
- Distributors and wholesalers in the Haute-Garonne department 98
- Education providers in the Haute-Garonne department 94
- Family-owned companies in the Haute-Garonne department 72
- Financial services firms in the Haute-Garonne department 70
- Higher Education companies in the Haute-Garonne department 66
- Critical infrastructure operators in the Haute-Garonne department 64
- Retail companies in the Haute-Garonne department 63
The same list elsewhere in France
- Construction companies in France 2,209
- Construction companies in Île-de-France 556
- Construction companies in Auvergne-Rhône-Alpes 372
- Construction companies in Provence-Alpes-Côte d'Azur 202
- Construction companies in Grand Est 196
- Construction companies in Nouvelle-Aquitaine 177
- Construction companies in Pays de la Loire 141
- Construction companies in the Rhône department 140
- Construction companies in Occitanie 133
- Construction companies in the Hauts-de-Seine department 113
- Construction companies in Hauts-de-France 108
- Construction companies in Brittany 92
- Construction companies in Normandy 92
- Construction companies in the Bouches-du-Rhône department 91
- Construction companies in the Gironde department 67
- Construction companies in the Val-de-Marne department 63
- Construction companies in the Loire-Atlantique department 57
- Construction companies in the Seine-et-Marne department 57
- Construction companies in the Essonne department 56
- Construction companies in the Isère department 52
- Construction companies in Bourgogne-Franche-Comté 50
- Construction companies in the Yvelines department 50
- Construction companies in the Bas-Rhin department 49
- Construction companies in Paris 112