What Myrium does

Myrium (legal entity Gestionova, SAS registered in Versailles) is a privately held French collective of 31 independent, human-sized building-services companies operating under a unified brand, headquartered in Vélizy-Villacoublay with a workforce of 1,600+ collaborators. Originally founded in 1921 as Rougnon Frères and rebranded to Myrium in 2023, the group provides end-to-end multi-technical services for existing buildings — covering HVAC, electrical (strong and weak currents), plumbing, roofing, waterproofing, facade work and ITE, carpentry, metalwork, automated closures, access control, photovoltaic installation, urban greening, and workspace design-and-build. The company positions itself as the "independent operator of reference for the sustainable performance of buildings," addressing a French building stock responsible for 43% of national energy consumption and 23% of GHG emissions.

Name

Myrium

Legal name

Gestionova

Website

https://myrium.fr

Company type

Private

Founded year

1920

Operating status

Operating

Short description

Myrium is a French collective of 31 independent building-services companies providing multi-technical maintenance, renovation, and energy-performance services across HVAC, electrical, plumbing, roofing, and related trades to social housing operators, commercial real estate, healthcare, hospitality, infrastructure, and data-center clients, primarily in Île-de-France with growing regional presence.

Ownership category

akta.pro rank

Product category

Building Maintenance Services

NAICS

Plumbing, Heating, and Air-Conditioning Contractors (23822), Specialty Trade Contractors (238), Residential Remodelers (236118), Foundation, Structure, and Building Exterior Contractors (2381)

SIC

Construction - Special Trade Contractors (1700), Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip (3585)

akta.pro primary industry

Hard Services (MEP/HVAC, Electrical, Plumbing) (BPABAAAA)

akta.pro secondary industries

HVAC & Refrigeration Contracting (IMAFALAB), Renovation, Remodeling & Tenant Improvements (General Contracting) (IMAFAAAE), Grounds, Landscaping & Exterior Services (BPABAAAD)

Keywords

• Multitechnical building maintenance
• Facility management services
• Energy renovation contracting
• Commercial HVAC services
• Building envelope works

Headquarters

HQ city

Vélizy Villacoublay

HQ country

France

HQ region

Europe

Offices18 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Maintenance and Facility Management Contracts: Recurring multi-technical maintenance and facility management contracts (P1-P4 exploitation contracts) with public and private clients across residential, tertiary, healthcare, and industrial sectors. These contracts generate predictable recurring revenue with performance commitments.
2. Construction and Renovation Works: One-time and project-based works contracts covering all building trades: electrical, HVAC, plumbing, roofing, waterproofing, facade work, landscaping, and full-scope (TCE) renovations. Revenue is project-driven with variable contract sizes from small repairs to large-scale renovations.
3. Deployment Services for Diffuse Sites: Nationwide deployment of installations and services for clients with distributed networks (retail chains, bank branches, gas stations), providing coordinated maintenance and works across multiple small sites.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels5 records

Core offering

Myrium is a French collective of 31 independent building-services companies that delivers multi-technical maintenance, renovation, and works for existing buildings. Its core offerings cover the full spectrum of building trades — HVAC (chauffage, ventilation, climatisation), electrical, plumbing, roofing, waterproofing, facades, carpentry, metalwork, automated closures, access control, photovoltaic, and urban greening — sold through recurring P1–P4 exploitation contracts, Contrats de Performance Énergétique (CPE), and one-off works or full-scope (TCE) renovation projects with performance guarantees.

Product overview

Myrium is a collective of 31 independent building maintenance, renovation, and services companies operating primarily in Ile-de-France and expanding to French regions. The company offers a comprehensive portfolio organized as a platform of complementary services rather than a single unified product. Core offerings include multitechnical maintenance and facility management, all building trades (HVAC, electrical, plumbing, roofing, waterproofing, facade work), energy renovation with performance commitment, and specialized services for data centers, urban greening, and workspace design. The portfolio is structured around key subsidiaries and sub-brands including Myrieca (energy renovation specialist), Eddia (climate/electrical engineering), Reolian Multitec (multi-technical services), Serenitys Workplace (workspace design), and Merci Raymond (urban greening). Services range from single-trade interventions to comprehensive all-trades (TCE) renovation projects, with the Ensemblier offering providing integrated project management from design through operation with guaranteed energy performance outcomes.

Differentiator

Problem solved

Functional benefit

Brands

• Myrieca: Filiale dediee a la renovation energetique et environnementale des batiments existants
• Merci Raymond
• Reolian Multitec
• L'Ecole Myrium

Products and services

• Maintenance Multitechnique & Facility Management Comprehensive maintenance of technical building installations with monotechnical or multitechnical contracts, including facility management services for building operations and occupant services.
• Chauffage / Ventilation / Climatisation (CVC) Design, installation, and maintenance of heating, ventilation, and air conditioning systems for industrial, commercial, and residential buildings.
• Électricité Générale (Courants Forts & Courants Faibles) Design, installation, maintenance, and repair of electrical installations including power distribution, energy management, IT networks, fire safety, and security systems.
• Plomberie Design, construction, renovation, maintenance, and repair of all sanitary installations in residential and commercial buildings.
• Travaux Tous Corps d'État (TCE) Comprehensive renovation and rehabilitation services covering all building trades for housing, commercial, and public facilities.
• Ensemblier de la Rénovation Énergétique du Bâtiment Integrated energy renovation services with performance commitment, providing single-point-of-contact project management from design through execution and operation.
• Photovoltaïque Installation and maintenance of photovoltaic systems (5kWc to 500kWc) on various roof types including historical monuments.
• Gestion Technique du Bâtiment (GTB) - Building Management Systems Building management systems combining electrical and climate engineering to optimize facility operations, comfort, and energy performance.
• Groupes Électrogènes / Réseaux Secourus Installation, rental, and maintenance of generator sets and uninterruptible power supplies with studies, installation, maintenance, load bank testing, and energy management.
• Couverture Roofing services including traditional coverings (zinc, copper, lead, slate, tile), traditional Parisian roof expertise, and maintenance/repair contracts.
• Étanchéité Waterproofing services for terraces with thermal insulation, membrane systems, and specialized applications including parking waterproofing.
• Ravalement - Isolation Thermique par l'Extérieur (ITE) Facade renovation and exterior thermal insulation services combining traditional restoration with modern energy-efficient solutions.
• Menuiserie & Agencements

Quantifiable outcome

• 410-430M€ annual revenue growing at >10%/year average over 10 years
• +4 more outcomes

Named customers15 records

Segments8 records

Ideal customer profiles6 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Six partnerships are on record, tiered core and minor.

• EddiacoreStrategic or Co-development Partner · 16 September 2025Eddia, a specialist in climate and electrical engineering (genie climatique et electrique) with 25 years of experience and 105 employees, joined Myrium in September 2025. This represents Myrium's first expansion beyond Île-de-France, covering Centre-Val de Loire, Pays de la Loire, and Nouvelle-Aquitaine.
• MyriecacoreStrategic or Co-development Partner · 23 April 2024Myrieca is a subsidiary of Myrium, founded in September 2023, dedicated to energy and environmental renovation of existing buildings as a main contractor (ensemblier travaux) with performance guarantees. It aggregates the Group's technical expertise for comprehensive whole-building energy renovations.
• Auxigène & Gesclim (Pérennité Partners)coreStrategic or Co-development Partner · 1 January 2024Auxigène and Gesclim, both from Pérennité Partners, joined Myrium in 2024. Auxigène (founded 1991, 79 employees) specializes in multitechnical maintenance for Parisian office buildings and hotels. Gesclim (founded 1978, 24 employees) specializes in air conditioning maintenance and installation for tertiary and data center clients.
• Merci RaymondcoreStrategic or Co-development Partner · 1 January 2023Merci Raymond joined the Myrium collective in 2023 as a specialist in urban greening, urban agriculture, and landscape design. The two companies co-authored the book 'Le Quartier du Futur' and were jointly awarded by the Palladio Foundation for their urban (re)vegetalization project.
• AGS - Air & Gen ServicesminorStrategic or Co-development Partner · 1 January 2019AGS joined Myrium in 2019, specializing in generator sets and air compressors installation and maintenance, complementing Myrium's electrical and climate engineering capabilities.
• RougnoncoreStrategic or Co-development Partner · 1 January 2016Rougnon, founded in 1921, is the origin company of what would become Myrium. It contributed its thermal engineering expertise and employee shareholder culture, and remains the founding pillar of the Group.

Scale indicators11 records

Recent moves9 records

Expansion highlights7 records

Direct peers

• Proxiserve: French specialist in individual heating maintenance, water treatment, and multitechnical services for social housing — directly comparable to Myrium's social housing-focused subsidiaries (Bédier, SITMAM, Disdero).
• Idex: French energy services specialist focused on building energy performance, district heating, and CPE contracts — directly comparable to Myrium's CPE positioning and heating exploitation subsidiaries.
• Dalkia: EDF subsidiary specializing in district heating networks, collective heating exploitation (P1-P4 contracts), and building energy services — directly comparable to Myrium's Disdero/Bergamaschi/Albasini/Hubert Chauffage heating exploitation business.
• ENGIE Home Services (formerly SAVEL): ENGIE subsidiary providing heating maintenance, boiler servicing, and energy services to individual and collective residential customers — competes with Myrium in residential heating exploitation and CPE contracts.
• SPIE: French-listed multitechnical services group (€8B+ revenue) offering electrical, HVAC, and FM services across France — closest direct competitor to Myrium's multitechnical platform, particularly on multitechnical maintenance and ensemblier tenders.
• SNEF: Marseille-based French electrical contracting group (€2B+ revenue) specializing in electrical installations, multitechnical maintenance, and energy services — directly comparable to Myrium's Fouassin, Mermin, Ecomelec electrical subsidiaries.

Broad incumbents

• Eiffage Énergie Systèmes: Subsidiary of Eiffage Group providing multitechnical building services, electrical, HVAC, and energy renovation across France — competing with Myrium in tertiary, infrastructure, and energy renovation markets.
• Equans (formerly ENGIE Solutions): Bouygues-owned facilities services and energy services group (€18B+ revenue) covering multitechnical maintenance, HVAC, energy performance, and electrical contracting — competes with Myrium on large public tenders and data center work.
• VINCI Energies: Large international multitechnical services group within VINCI (€15B+ revenue) — competes with Myrium's electrical contracting, data center, and infrastructure subsidiaries across France and Europe.
• Bouygues Energies & Services: Bouygues Construction subsidiary providing multitechnical facility management, energy performance, and HVAC services — competes with Myrium in tertiary, healthcare, and large public sector accounts.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key highlights7 records

Customer concentration

Compliance15 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Subsidiaries33 records

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 Myrium