NORMAXIS in Île-de-France
MEP engineering office, environmental consulting, biodiversity certification

NORMAXIS operates in the Île-de-France region on commercial, residential, public and urban-development projects: RE2020 thermal engineering, MEP building services, acoustics, environmental consulting (HQE Bâtiment Durable, BREEAM, NF Habitat), the tertiary energy-reduction decree (éco-énergie tertiaire) and the BACS decree, ecological surveys, court-admissible measurements and independent third-party biodiversity certification. Teams mobilised on Paris and the eight Île-de-France départements.

Frame a project in Île-de-France See our practices

Regional presence

Europe's largest office stock, under maximum regulatory pressure.

Île-de-France concentrates the largest office stock in Europe and, with it, the greatest exposure to the tertiary energy-reduction decree (éco-énergie tertiaire). For an Île-de-France owner, the consumption-reduction trajectory and the annual declaration on the OPERAT platform are not one compliance matter among others: they are the leading risk factor on asset value, with deadlines that are now close at hand.

The region's second defining feature is density. It constrains everything: site access, the siting of technical equipment, exposure to noise from infrastructure and airport platforms, the intensity of the urban heat island, and the land available for ecological offsetting. Île-de-France operations are rarely limited by technical factors; they are limited by space and by the schedule.

As in Auvergne-Rhône-Alpes, the region has no dedicated regional environmental-assessment scheme: projects are structured around BREEAM, HQE Bâtiment Durable and NF Habitat, with a weighting towards BREEAM more pronounced than elsewhere, tied to the internationalisation of investors.

Our practices in the region

Three subsidiaries, one complete offer for all your Île-de-France projects.

Arkemep

Thermal & MEP engineering

  • • RE2020 climate zone H1a, urban heat island and summer comfort
  • • Tertiary energy-reduction decree / OPERAT, BACS decree, DDADUE audit, ISO 50001
  • • HVAC, plumbing, CFO/CFA electricity, BMS
  • • Dynamic thermal simulation on heavily glazed commercial buildings
  • • EN 15978 carbon LCA, indoor air quality simulation
Arkenor

Consulting & ecological surveys

  • • Certification consulting: BREEAM, HQE Bâtiment Durable, NF Habitat
  • • Fauna-flora surveys in urban and peri-urban settings
  • • CNPN files, Natura 2000, French Water Act, ERC sequence
  • • Court-admissible acoustic measurements, air-tightness tests, ventilation
  • • Electromagnetic field measurements as independent third party
Irice

Third-party certification

  • • Effinature biodiversity certification ISO/IEC 17065
  • • BPS portfolio diagnostic
  • • Efficarbone construction-site carbon
  • • BREEAM assessment (BRE Global)
  • • Opposable ESG indicators (CSRD ESRS E4, SFDR PAI 7)

Territorial coverage

Paris, the inner ring and the outer ring.

Intervention across the eight Île-de-France départements, from inner Paris to the outer-ring territories involved in the urban-development operations and infrastructure of Greater Paris.

Paris

Inner Paris. Major office refurbishment, restructuring of Haussmann-era buildings, hotels, public facilities, heritage constraints and site logistics in a dense setting.

Inner ring

Boulogne-Billancourt, Nanterre and La Défense, Saint-Denis, Montreuil, Créteil, Issy-les-Moulineaux. Investment-grade offices, planned development zones (ZAC), mixed-use operations around the Grand Paris Express stations.

Outer ring

Versailles, Saint-Quentin-en-Yvelines, Évry-Courcouronnes, Cergy-Pontoise, Marne-la-Vallée. Urban development, logistics, airport platforms, campuses and facilities.

Cross-cutting stakes

Noise exposure plans for Roissy and Orly, urban heat island, the regional green-and-blue network, land frugality and material reuse on urban-renewal operations.

By city

Our services in Paris, Nanterre-La Défense, Boulogne-Billancourt, Saint-Denis, Versailles and Cergy.

Building Acoustics

Paris Nanterre Boulogne-Billancourt Saint-Denis Versailles Cergy

RE2020 Thermal Study

Paris Nanterre Boulogne-Billancourt Saint-Denis Versailles Cergy

MEP building services engineering

Paris Nanterre Boulogne-Billancourt Saint-Denis Versailles Cergy

Environmental certification advisory

Paris Nanterre Boulogne-Billancourt Saint-Denis Versailles Cergy

Ecological surveys

Paris Nanterre Boulogne-Billancourt Saint-Denis Versailles Cergy

Electromagnetic field measurements

Paris Nanterre Boulogne-Billancourt Saint-Denis Versailles Cergy

Indoor air quality simulation

Paris Nanterre Boulogne-Billancourt Saint-Denis Versailles Cergy

Dominant stake

The tertiary decree, the leading concern of Île-de-France owners.

The tertiary energy-reduction decree (éco-énergie tertiaire) applies to buildings hosting tertiary activities over a floor area of at least 1,000 m². It imposes a final-energy consumption-reduction trajectory and an annual data declaration on ADEME's OPERAT platform. In Île-de-France, it concerns a considerable share of the stock and weighs directly on the rental and market value of the assets.

  • Choice of method, a reduction in relative terms against a reference year, or reaching a consumption level in absolute terms. The trade-off is made on the building's real data and is not neutral: it determines the effort required over the whole period.
  • Data reliability, often the weak point of these files, between incomplete meters, poorly defined perimeters and inadequately justified reference years.
  • BACS decree, the obligation to equip tertiary buildings with a building automation and control system, complementary and to be handled jointly.

We work on the energy audit, the choice of method, the compilation and OPERAT declaration, then on the action plan and its translation into works.

Île-de-France benchmarks

Key facts.

8 dépts

Regional coverage

Paris, inner and outer ring

H1a

RE2020 climate zone

Across the whole region

1,000 m²

Tertiary decree threshold

Tertiary activity floor area, OPERAT declaration

No label

No regional scheme

BREEAM, HQE and NF Habitat are the reference

Île-de-France FAQ

Frequently asked questions about our work in Île-de-France.

No. Our single head office is in Aix-en-Provence (Espace Wagner) and we have no Paris office. Our teams travel as the project requires. We say so plainly rather than displaying a token address: on study, consulting and certification assignments, the value lies in the competence mobilised and the continuity of the team, not in geographical proximity. For assignments involving frequent visits, such as weekly site supervision, we state this from the proposal stage and either adapt the arrangement or advise against it.
The scheme targets buildings, parts of buildings or groups of buildings hosting tertiary activities over a floor area greater than or equal to 1,000 m². The threshold is assessed on the cumulative total of tertiary floor areas, which covers some counter-intuitive situations, notably mixed-use complexes and multi-occupant sites. That is precisely where errors of assessment arise. The first step of our assignment is to qualify liability and delimit the declaration perimeter, before any OPERAT declaration.
If the asset is intended for an institutional investor or an international occupier, BREEAM prevails in practice, because it is part of the vocabulary of the transaction and of valuation. HQE Bâtiment Durable remains more relevant for public procurement and for programmes where the health, comfort and quality-of-use aspects take priority. Combining the two is possible and is seen on prime assets, but it doubles part of the burden of proof: it must be decided at the outset, not added during design.
Yes, and it is often discovered too late. Buildings shelter protected species, nesting birds and bats in particular, whose presence makes a derogation file mandatory before works, including in major refurbishment. Urban brownfield sites also host fauna and flora that are sometimes of heritage value. The difficulty specific to Île-de-France is offsetting: available offset land is scarce and expensive, which makes avoidance and reduction far more economical than compensation, provided they are addressed early.
We work on the related real-estate and urban-development operations, those developing around the new stations: mixed-use programmes, offices, housing, public facilities. Our scope there is building and environmental engineering, thermal and MEP studies, acoustics, certification consulting, ecological expertise and the ERC sequence, and not the transport infrastructure itself. On these operations, noise exposure and the constraints of building on a tight site are the two points to address as early as possible.

A project in Île-de-France?

Tertiary decree and OPERAT, BREEAM or HQE consulting, thermal and MEP studies, ecological expertise, biodiversity certification: our teams reply within 48 working hours.

Get in touch

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NORMAXIS - chiffres-clés du groupe
ÉlémentValeur
Antériorité du groupedepuis 2009
FilialesARKEMEP (ingénierie énergie/MEP), ARKENOR (environnement/AMO), IRICE (certification tierce partie)
Accréditation (IRICE, vérification/certification)Cofrac n°5-0655, ISO/IEC 17065
Régions d'interventionPACA, Occitanie, Nouvelle-Aquitaine, AURA, Île-de-France, et Monaco
Villes couvertes par une page dédiée30
Siège (seule implantation physique)Aix-en-Provence (13290)
Référentiels propriétairesEffinature, BPS, Efficarbone