BBCA, the low-carbon label

The BBCA label, for Bâtiment Bas Carbone (low-carbon building), was created in 2015 by the BBCA Association. It was the first label in the world to measure a building’s carbon footprint over its whole life cycle, that is 50 years.

Its philosophy can be summed up in one phrase: count everything that counts. BBCA does not stop at the electricity bill; it accounts for the carbon emitted to manufacture cement, transport steel and deconstruct the building at the end of its life.

A few solar panels are not enough to obtain the label: you have to act on the very fabric of the building. The standard rests on four pillars.

Thoughtful construction

Sufficiency: build fewer square metres for the same use, by sharing spaces. Structure: favour timber, raw earth or low-carbon concrete. Mixed use: design a reversible building, for example offices that can be converted into housing.

Controlled operation

Decarbonised energy: connection to a green heating network or a biomass boiler plant. Sufficiency in use: equipment controlled by a class A building management system (BMS). Refrigerants: strict limits on those with a high global warming potential (GWP).

Carbon storage

Extensive use of timber (CLT, timber frame) and plant-based insulation such as hemp or straw. The building becomes a carbon sink, an “urban forest” that stores CO₂ instead of emitting it.

Circular economy

Reuse of second-hand materials (raised floors, carpets); design for disassembly to make future recycling easier; recovery of more than 90% of construction waste as materials.

BBCA awards a score in points: every tonne of CO₂ avoided or stored earns points. The score determines one of the label’s three levels.

Everything rests on the life cycle assessment (LCA), a standardised calculation that accounts for every gram of CO₂ emitted by the building. It comes into play at two stages.

DesignDynamic LCA

The engineer runs an LCA simulation and selects materials, based on their FDES (French environmental product declarations), to stay below the thresholds. This stage awards the provisional label.

DeliveryVerification

At handover, an auditor (Certivéa, Promotelec or Prestaterre) checks that the materials installed match the LCA study. This stage awards the final label.

Direct costs

Two items add up: the certification body’s fees and the LCA study.

Additional construction cost and green value

Building low-carbon often costs more, as timber remains more expensive than concrete. The value is, however, recognised immediately by green funds, thanks to the EU taxonomy.

Advantages

• Protection against regulatory obsolescence, in view of the 2028 and 2031 RE2020 thresholds.
• Access to European green financing.
• A single indicator, carbon, which makes the message clear.

Limitations

• Timber and bio-based materials remain more expensive than concrete.
• Acoustic and fire safety constraints are more complex in timber structures.
• Some bio-based materials may be in short supply on the market.

Reaching the Performance or Excellence level does not require optimising every pillar in the same way. The following table shows, by project type, how easy it is to secure the points in each pillar for the Performance level. It says nothing about their return, which is covered further down.

To help you decide, each pillar has been converted into potential financial value: preferential rates, operating cost savings, asset value. These figures are based on green loans (BBVA) and on the value linked to the EU taxonomy.