HQE office certification, BREEAM, WELL: choosing the right label
The choice of framework aligns with the holding thesis, not with market fashion
Stacking four labels on the same asset destroys patrimonial value instead of creating it: a well-chosen framework generates a sale premium recognised by the market, which a second label does not amplify. The yield gap between a certified office asset and its uncertified equivalent remains significant in the most liquid French markets, particularly for assets larger than 5,000 m² traded in the Paris CBD and La Defense. Regulations mandate a reduction in the energy consumption of the office stock by 2030, SFDR Article 8 directs institutional flows, and major corporate users filter their searches by framework. For an asset manager, the question is no longer whether the building should be certified, but which label carries the patrimonial strategy. Kytom, founded in 2006, frames the framework upstream, prescribes the finishing works packages compliant with the HQE Residential 2-3 point acoustic requirements that mandate compliance with class B or A of standard ISO/TS 19488:2021 at the building scale or with BREEAM targets, and assembles the auditable evidence file through to delivery.
The right label is chosen upstream, based on the target tenant, the holding horizon and the sale argument. Three grids structure the trade-offs on the environmental side:
- HQE Sustainable Building: anchors the asset in the French market, legible to CAC 40 users and retail SCPIs. The complementary NF Habitat HQE® profiles (Low Carbon, Circular Economy, Air Quality, Biodiversity) target a priority performance axis according to the investment thesis; by way of comparison on the validity period of quality certifications in the sector, the QUALITE QUALIBAT certifications (Quality Commitment and Quality Mastery) are valid for 4 years with a mandatory intermediate follow-up audit (Qualibat, 2019).
- International in-use assessment framework: addresses international tenants and pan-European SFDR Article 8 funds.
- Dedicated low-carbon framework: carries a documented low-carbon strategy, useful on heavy refurbishment operations.
On an asset in operation, new-build frameworks do not apply. In-use frameworks audit actual performance: consumption recorded over 12 months, air quality measured according to NF EN 16798, traced waste management, documented responsible purchasing policy. The Excellent level is earned through the building’s technical management, not through a file submitted in one go.
For the asset manager: the Kytom internal decision rule. No certification without a target institutional tenant OR without a holding horizon > 7 years. On an asset < 3,000 m² intended for a quick sale to a non-institutional private investor, the certification project management cost is not recovered in the sale price. Contrary to the prevailing ESG doxa that pushes for systematic certification, our experience shows that certification is not always value-creating: on assets with a short holding thesis, the prescription overcost can degrade the IRR. The label vs cash-flow trade-off is decided in the investment committee, not in the technical committee.
Comparative table of environmental and usage frameworks applicable to offices
On a premium asset, usage frameworks complement the HQE or BREEAM base without replacing it. The combination of WELL Gold and HQE Very Good constitutes a standard commonly observed on prime Paris operations.
| Label | Scope | Market use |
|---|---|---|
| HQE Sustainable Building | Overall environmental performance | French office assets |
| BREEAM In-Use | Environmental on existing stock | Pan-European funds, SFDR art. 8 |
| Building carbon footprint | Lifecycle emissions measurement | Heavy refurbishments |
| WELL Building Standard | Air, water, light, comfort, mental | Premium headquarters |
| Quality of work life framework | Occupant comfort and health | Office refurbishments |
| BiodiverCity | Site biodiversity | Office parks, campuses |
Kytom integrates usage requirements from the schematic design phase, notably on acoustics according to NF S 31-080, lighting according to NF EN 12464-1 and indoor air quality according to NF EN 16798.
Limits of label stacking. Beyond two frameworks, the marginal documentary return becomes negative: duplication of audits, project management overcost, operational management complexity. Stacking four environmental and usage frameworks on the same asset is a marketing argument, not auditable patrimonial value creation, even though the WELL v2 Air concept comprises 4 preconditions and 10 optimizations covering air quality, ventilation, filtration and VOCs. The profession’s doxa underestimates the hidden cost of documentary fragmentation in operation: separate auditors, staggered audit schedules, non-harmonised indicators.
Finishing works weigh significantly on the final audit score
Finishing works weigh significantly on the final audit score: material choices, installation quality and documentary traceability are decisive levers that the fit-out prescription must anticipate from the design phase. On an office project, the fit-out prescription determines the final score. The audited packages:
- Paints, adhesives, coverings: VOC emissions class A+, compliant product technical sheets.
- EPDs (Environmental and Health Declaration Sheets): available for each prescribed product, INIES database.
- Bio-based or reused materials: documented share in kg or as a percentage of mass.
- Construction waste traceability: SOGED waste tracking slips, recovery rate compliant with national targets (target rate of 70% recovery of non-hazardous construction waste).
- Verified acoustic performance: in situ measurements according to the frameworks in force.
- Lighting: lux and UGR thresholds compliant with the framework applicable to offices, that is an acceptance with maintained illuminance of 300 lux and UGR 22 in accordance with the office building acceptance framework, management via BMS, with a target installed power less than or equal to 2.8 W/m² per 100 lux of average illuminance to be maintained.
A floor plate fitted out without this discipline significantly weakens the result of the final audit. Kytom documents each package so that the targeted certification is secured, not merely hoped for, and so that the documents are submitted in the format expected by the auditor.
For the asset manager: CAT A vs CAT B scope to be framed contractually. On a tenant fit-out project (CAT B) where the certification is carried by the landlord in CAT A, requiring EPDs and material traceability on all finishing works packages increases the works cost without benefit to the tenant. The audit scope must be framed with the certification project management before the contractor tender, and the prescription overcost must be clearly allocated (landlord re-invoicing, rent-free period, or integration into the fit-out plan).
The evidence file is assembled continuously, from the studies phase to operation
Certification is won at the time of the audit, but it is prepared during the weeks of construction. The evidence file is assembled deliverable by deliverable, across four phases:
| Phase | Key deliverables |
|---|---|
| Studies | Framework note, environmental targets matrix, prescription plan |
| Works | EPDs collected by package, product safety sheets, waste tracking slips, dated photos |
| Acceptance | Acoustic, illuminance, air quality reports, as-built file structured for the auditor |
| Operation | Consumption recording protocol, commissioning plan, FM training |
Kytom delivers this file alongside the standard as-built file for asset managers and property managers. It is assembled with the certification project manager appointed by the client.
Frequently asked questions
Which label should be chosen for a Paris office asset intended for a CAC 40 tenant?
Environmental certification at the Very Good or Excellent level, complemented by a Gold-level wellbeing certification on headquarters. This combination constitutes the standard observed on the prime Paris market for institutional tenants.
How much does an environmental certification process cost for an asset in operation?
Certification project management represents a significant budget line, varying according to the chosen framework and the size of the asset, to be factored in from the structuring of the operation, excluding technical prescription. On an asset < 3,000 m² intended for a sale to a non-institutional private investor, this cost is not recovered in the sale price.
Should several labels be stacked on the same building?
Beyond two frameworks, the multiplication of certifications generates documentary redundancies and dilutes the legibility of indicators without bringing additional value at transaction. Stacking several environmental and social certifications generates duplication of audits and fragmentation of indicators in operation. The Kytom rule: one environmental framework and one usage framework maximum.
What is the weight of finishing works in the final audit score?
Finishing works weigh significantly in the final score: VOC emissions class A+, EPDs from the INIES database, SOGED waste traceability, acoustic measurements compliant with the framework applicable to workspaces, lighting according to the standard in force for indoor workplaces.
How is the evidence file assembled for the auditor?
Across four phases: studies (framework note, targets matrix), works (EPDs by package, waste tracking slips, dated photos), acceptance (acoustic, illuminance, air quality reports), operation (consumption recording, commissioning). Kytom delivers this file alongside the standard as-built file.
