Sustainable materials for offices: the guide to choosing right
The 4 families of sustainable materials and their office uses
Material trade-offs are a major driver of the carbon footprint of an office fit-out, based on the Environmental Product Declarations published in the INIES database. Yet commercial vocabulary blurs the criteria: ‘eco-responsible’, ‘green’, ‘natural’ rest on no regulatory definition. The VOC emission class is mandated by the decree of 19 April 2011, and the EPD is governed by the NF EN 15804+A2 standard. Since 2006, Kytom has supported real estate departments in these technical choices, cross-referencing performance in use, regulatory compliance and consistency with the targeted building certifications (HQE, LEED, BREEAM), knowing that BREEAM allows up to 10% of exemplary initiatives not covered by the framework to be credited.
A family covers a sourcing logic and a homogeneous environmental profile. Kytom structures trade-offs around 4 operational categories, validated on the in-house portfolio of projects delivered since 2006.
- Certified wood (FSC, PEFC): structure, furniture, flooring, acoustic panels. Stores around 1 tonne of CO2 per m³ (structural solid wood EPD data from the INIES database, consulted 2024). Favour European species (oak, beech, maritime pine) to limit transport.
- Bio-based: hemp, flax, cellulose wadding, cork. Used in insulation, acoustic panels, wall coverings. Regulate ambient humidity within the recommended comfort range of 40 to 60% relative humidity.
- Recycled: carpet tiles (40 to 100% regenerated polyamide depending on supplier), structural steel (average rate of 70% in France, steel sector data 2023), glass, recycled concrete. Significantly reduced carbon footprint compared to virgin material, according to the EPD data available in the INIES database.
- A+ paints and finishes: water-based, VOC below 1 g/L, free of free formaldehyde, classified for wash resistance according to the requirements applicable to interior wall paints.
Each family covers distinct uses. The logic is not to substitute everything, but to prioritise the 4 high-impact items: floors, partitions, fixed furniture, wall paints.
Kytom’s position, contrary to common practice. Industry orthodoxy positions bio-based as superior by default to recycled. Our reading differs: in a high-turnover office, a recycled LVT PVC tile (15 to 20 years’ service life) systematically beats a wool carpet or cork (5 to 8 years in high-traffic areas) on amortised carbon footprint. Bio-based wins in quiet zones (meeting room, management), recycled wins in traffic zones. A sustainable material is not a species, it is a use.
When this approach is NOT relevant. All bio-based stops being cost-effective in spaces with more than 200 people/day: wool carpet or cork wear out prematurely and require replacement at 5 years, versus 10 years for a recycled LVT PVC tile, which cancels out the carbon benefit. Likewise, FSC solid wood furniture is not justified below 30 workstations: the extra cost on a small batch does not dilute into sufficient economies of scale. In these cases, Kytom steers towards E1-certified melamine board and a take-back channel.
Reading an EPD and a VOC emission class: 3 benchmarks to get it right
The EPD (Environmental and Health Declaration Sheet) remains the reference tool, governed by a harmonised European normative framework and referenced in the INIES database. Three benchmarks structure a reliable reading.
- Third-party verification: only EPDs verified by an accredited body carry evidential value in a recognised environmental certification. « Self-declared » sheets are not enforceable.
- GWP indicator (Global Warming Potential): expressed in kg CO2 equivalent per functional unit, over the reference service life (often 50 years for a construction material, a standardised value of the applicable European framework). Compare on an equal-unit basis.
- VOC emission class: mandatory labelling in France since 2012, scale A+ to C according to the decree of 19 April 2011 (JORF no. 0111 of 13 May 2011). For an office, require A+ on all installed products (paints, floors, adhesives, panels).
Kytom checks these 3 points before any order validation, across all finishing trade packages. A bio-based material without an EPD or emission class is not considered sustainable, despite its marketing narrative. Documentary traceability takes precedence over the supply-chain argument.
Limit of the EPD requirement. For niche products (artisanal bespoke furniture, specific finishes below 50 m²), requiring a third-party verified EPD can exclude a significant share of the French market, as the verification investment is out of reach for small suppliers. In this case, Kytom accepts a documented supplier environmental declaration (composition, origin, end of life) rather than a complete absence of criteria, and mentions this explicitly to the client.
For the CFO and Asset Manager: decoding the real extra costs (3 to 6% of the overall budget)
The issue is not « sustainable materials cost more » but « at what budget scale and over what holding horizon is the trade-off cost-effective ». The extra cost is measured item by item. The items most affected by the choice of sustainable materials are generally paint (A+ labels or European Ecolabel), floor coverings (recycled tiles), partitions, wood furniture (FSC certification) and bio-based suspended ceilings.
| Item | Standard solution | Sustainable solution |
|---|---|---|
| Wall paint | Standard acrylic | A+ Ecolabel |
| Carpet floor | Virgin tiles | Recycled tiles |
| Partitions | Standard plaster | Recycled plaster and wadding |
| Wood furniture | Melamine board | FSC solid wood |
| Suspended ceiling | Mineral tiles | Bio-based cork |
CFO and Asset Manager reading. At the scale of an office project, the material extra cost remains limited relative to the overall budget, once studies, project management, technical trade packages and furniture are factored in. This extra cost can be partly offset by the reduction in site waste through enhanced sorting during the construction phase. For the Asset Manager, the real lever lies elsewhere: an office asset compliant with regulatory obligations (liability triggered as soon as a building, set of premises or plot exceeds 1000 m² of office activities) and holding a recognised environmental certification is valued above the secondary market in the French prime office segment.
Method
- Define your environmental priorities
Identify your priority CSR commitments: carbon footprint, air quality, circular economy or building certification. This prioritisation guides all subsequent trade-offs and avoids spreading efforts too thinly. - Build a materials matrix
For each trade package (floors, partitions, paints, furniture), compare 2 to 3 options across four criteria: carbon impact, certification, availability, price. Kytom delivers this pre-filled matrix at the detailed design phase to speed up your decisions. - Verify traceability and EPD
Before validation, require verified EPDs and FSC, PEFC, Ecolabel or A+ certificates. Check the geographic origin and the actual recycled content rate. This step eliminates 90% of greenwashing risks. - Measure air quality at handover
Before handing over the premises, have the ambient VOC level measured. This final check guarantees a healthy environment for your staff and provides documentary evidence for your CSR commitments.
Frequently asked questions
Is a bio-based material always more eco-friendly than a recycled material?
No. In an area with over 200 people per day, a recycled LVT PVC tile (15–20 year lifespan) delivers a more favourable amortised carbon footprint than wool carpet or bio-based cork (5–8 year lifespan in high-traffic zones). Bio-based wins in quiet areas, meeting rooms or executive offices. The sustainable material depends on use, not on origin.
