What DUMAS SA does

Dumas SA is a privately held Swiss general construction company headquartered in Sion, Valais, founded in 1980 by Jean-Bernard Dumas and currently led by General Director Vincent Detournay. The company operates across three service verticals: Building Construction (residential, commercial, industrial, and public buildings), Civil Engineering (roads, galleries, collectors, bridges, avalanche barriers, urban development, foundations, and demolition with material recovery), and General Contracting (end-to-end project management from conception to delivery). Its customers are private developers, commercial enterprises, real estate developers, and government/municipal entities across the Valais canton, with project sizes ranging from approximately CHF 330,000 to CHF 37 million.

Dumas operates from a single headquarters in Sion and executes projects using an owned fleet of specialized equipment including Liebherr 34K and 65K.1 cranes, Liebherr R 914 Compact and Menzi Muck 55 SA excavators, Bomag BMP 8500 compaction equipment, and a Mercedes-Benz vehicle fleet. All projects are executed under a validated integrated QSE (Quality, Safety, Environment) management system, supported by ISO 9001 and ISO 14001 certifications held since 1994. The company also operates material recovery and demolition valorization across four sites in central Valais.

The company has been part of the Belgian Thomas & Piron Group since 2008, with full integration completed by 2020. Thomas & Piron is an international construction group operating in 8 countries with 2,550 employees and CHF 620 million in annual revenue. Dumas SA retains operational autonomy in Valais while accessing the parent group's technical expertise, capital, and procurement leverage. The company employs approximately 150 qualified collaborators and generates revenue through project-based contracts with custom quotations; it is not publicly listed and does not disclose revenue.

Name

DUMAS SA

Legal name

Dumas SA

Website

https://dumas-construction.ch

Company type

Private

Founded year

1980

Operating status

Operating

Headcount range

11–50 employees

Short description

Dumas SA is a privately held Swiss general construction company based in Sion, Valais, founded in 1980. It delivers building construction, civil engineering, and general contracting services across the Valais canton, primarily to private developers, municipalities, and government entities, and is a wholly owned subsidiary of the Belgian Thomas & Piron Group.

Ownership category

akta.pro rank

Product category

Construction Services

NAICS

Nonresidential Building Construction (2362), Utility System Construction (2371), New Multifamily Housing Construction (except For-Sale Builders) (236116)

SIC

General Bldg Contractors - Nonresidential Bldgs (1540), Heavy Construction Other Than Bldg Const - Contractors (1600), Water, Sewer, Pipeline, Comm & Power Line Construction (1623), General Bldg Contractors - Residential Bldgs (1520)

akta.pro primary industry

Commercial General Contracting (New Build) (IMAFAAAA)

akta.pro secondary industries

Residential General Contracting (New Build) (IMAFAAAB), Construction Management & Delivery (EPCM/CMAR/Design-Build Oversight) (EUANALAE)

Keywords

• General construction services
• Civil engineering works
• Building construction
• General contracting
• Infrastructure construction

Headquarters

HQ city

Sion

HQ country

Switzerland

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Construction Services: One-time project-based construction services including building construction (residential, commercial, industrial, public buildings), civil engineering (road construction, galleries, collectors, networks), and general contracting. Revenue is generated through project contracts with clients including private developers, municipalities, and government entities.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

DUMAS SA is a general construction company based in Sion, Valais, Switzerland, offering three main service lines: Building Construction (residential, commercial, industrial, and public buildings), Civil Engineering (roads, galleries, collectors, bridges, urban development, foundations, demolition with material recovery), and General Contracting (full project management from conception to delivery). The company delivers these services across the Valais canton using an integrated QSE management system and a workforce of approximately 150 qualified collaborators.

Product overview

DUMAS SA is a general construction company organized around three main service sectors: Building Construction (Bâtiment), Civil Engineering (Génie civil), and General Contractor services (Entreprise générale). The company operates as a unified construction services provider rather than a platform-based software product, offering specialized expertise in residential, commercial, and industrial construction, as well as infrastructure projects including roads, galleries, bridges, and environmental installations. All services are delivered with an integrated Quality, Safety, and Environment (QSE) management system, supported by a workforce of approximately 150 qualified collaborators.

Differentiator

Problem solved

Functional benefit

Products and services

• Bâtiment (Building Construction) Building construction services covering individual and collective residential housing, commercial centers, industrial buildings, public edifices, villas, and chalets. Each project is executed with expertise across multiple technical domains and adaptability to current technologies, norms, and requirements. Targeted at private developers, real estate companies, and commercial clients in the Valais region.
• Génie civil (Civil Engineering) Civil engineering services including road construction and public works, gallery construction, collectors and networks, bridges and avalanche barriers, earthwork, urban development, foundations, and demolition with material recovery. Targeted at municipalities, government entities, and private developers requiring infrastructure and public works in natural or urban environments.
• Entreprise générale (General Contractor) General contractor services providing end-to-end project management from conception to delivery, coordinating all trade disciplines while maintaining budget control and quality assurance through an integrated QSE system. Targets clients who need a single point of accountability for their construction projects, including private developers, real estate investors, and public entities.

Quantifiable outcome

• Projects completed ranging from 330,000 CHF to 37,000,000 CHF, demonstrating capacity for projects of varying scales
• +1 more outcomes

Named customers11 records

Segments3 records

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature1 record

Partnerships

Four partnerships are on record, tiered flagship/parent company, core and minor.

• Thomas & Piron Groupflagship/parent companyStrategic or Co-development Partner · 1 January 2020Since 2020, Dumas SA is fully integrated into the Thomas & Piron Group, a Belgian international construction reference present in 8 countries with 2,550 collaborators. This integration has developed Dumas's capabilities and provided international opening while maintaining regional roots in Valais. Thomas & Piron has been designated 'Best Managed Company' multiple times and generates annual revenue of 620 million francs.
• Conforti SAcoreStrategic or Co-development PartnerConforti SA is mentioned as part of the Swiss entities within the Thomas & Piron Group, operating alongside Dumas. The group organized joint team building events including the Thomas & Piron Team Meeting 2024 in Belgium.
• Groupe Emery EpineycoreStrategic or Co-development PartnerGroupe Emery Epiney is another Swiss entity within the Thomas & Piron Group that participated in joint team building activities with Dumas SA, strengthening group ties.
• Material Recovery PartnersminorOthersMaterial recovery operations are handled across 4 sites in central Valais in collaboration with partners, managing valorization costs and transport.

Scale indicators5 records

Recent moves6 records

Expansion highlights4 records

Broad incumbents

• Implenia AG: Implenia is Switzerland's largest construction services provider, listed on the SIX, with offerings across building construction, civil engineering, and real estate development. Operates as a broad incumbent in the same categories as Dumas, though at substantially larger scale and national footprint.
• Frutiger AG: Frutiger AG is a Swiss construction group providing building construction, civil engineering, and infrastructure services. Comparable mid-to-large scale competitor in the same general contracting category with Swiss-wide operations across German and French-speaking regions.
• Losinger Marazzi AG: Losinger Marazzi is a major Swiss general contractor and real estate developer, subsidiary of Bouygues Construction. Provides total contractor services for residential, commercial, and mixed-use projects, with a French-Switzerland overlap comparable to Dumas's market.
• Marti AG: Marti Group is one of Switzerland's largest construction companies with operations in building, civil engineering, tunneling, and specialized construction. A broad incumbent competing across the same service categories as Dumas, particularly in civil engineering infrastructure.
• Walo Bertschinger AG: Walo Bertschinger is a long-established Swiss construction group operating across civil engineering, road construction, and building construction nationwide. Comparable service mix to Dumas with strong civil engineering presence, though operating at substantially larger scale and broader geographic footprint.

Direct peers

• Steiner AG: Steiner AG is a Swiss total contractor (general contractor and developer) operating across building construction and complex real estate projects. Although named as a Dumas customer on Les Rives de Bramois, Steiner is also a direct competitor in enterprise-grade general contracting for residential and commercial developments in French-speaking Switzerland.
• Evéquoz SA: Evéquoz SA is a Valais-based general construction company offering building, civil engineering, and general contracting services of comparable size and scope. Direct competitor in the same regional market with overlapping customer base of private developers, municipalities, and tourism/resort clients in the canton of Valais.
• INDUNI & Cie SA: Geneva-headquartered Swiss general contractor and civil engineering firm of similar mid-market scale, delivering building construction, civil works, and general contracting across French-speaking Switzerland. Comparable service portfolio and customer segments to Dumas, with overlapping regional presence in Western Switzerland.
• HRS Real Estate AG: HRS Real Estate AG is a Swiss general contractor specializing in complex building construction, real estate development, and total contracting services. Comparable in scope of general contracting and project management services for institutional, commercial, and residential clients across Switzerland.

Others

• Conforti SA: Conforti SA is a Martigny-based construction company acquired by the Dumas-led group in 2000 and now part of the Thomas & Piron Swiss entities. Sister company within the same parent group, operating adjacent territory in Valais with overlapping capabilities and shared group-level resources.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Customer concentration

• Facebookfacebook.com/DUMASentreprise
• LinkedInlinkedin.com/company/dumas-sa

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles9 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 DUMAS SA