Whole Life Carbon Assessment

Whole Life Carbon Assessment: from policy to practice

The construction industry is facing a growing challenge. For highly energy-efficient new buildings, embodied carbon can make up as much as 70% of total lifetime emissions. While a lot of focus has been placed on reducing operational carbon through building performance standards, emissions from materials, construction and end-of-life are now becoming the main issue when it comes to reaching net zero.

The changing role of building control

Building control teams are starting to take a more active role in assessing embodied carbon. This means building up expertise in areas such as life cycle analysis, carbon assessment methods and Environmental Product Declarations (EPDs).

Documentation requirements are also shifting. There is increasing expectation for baseline whole life carbon assessments, clear material specifications supported by EPDs, and final as-built carbon reporting. Some local authorities are beginning to set carbon intensity targets, with their internal building control responsible for reviewing submissions and checking the quality of the data.

What’s happening in practice

There is already good evidence that this approach works. Research from California looking at 30 new-build projects found that carrying out WLCAs early in the design process led to material changes and structural efficiencies that reduced embodied carbon by 20–30%, without increasing costs.

In the UK, projects that have moved early towards the Future Homes Standard have seen similar benefits. Collaborative design workshops have helped identify practical solutions such as bio-based insulation and more efficient structural layouts, cutting both embodied and operational carbon.

Commercial projects achieving 40–50% reductions tend to have a few things in common: bringing in sustainability specialists early, running integrated design workshops, using digital tools for live carbon tracking, and demonstrating how this can improve compliance to building control during the design stage.

Tools and standards

There are now well-established frameworks and tools to support WLCA. BS EN 15978 sets out the overall methodology, while RICS guidance provides practical direction.

Digital tools such as One Click LCA, EC3 and eTool are making whole life carbon assessments more accessible, even on smaller projects.

For data, practitioners rely on sources like the ICE Database for generic values and product-specific EPDs for more accurate inputs. Building control teams reviewing this information need to check that EPDs are independently verified and that system boundaries are appropriate. Industry targets such as LETI benchmarks and the RIBA 2030 Climate Challenge are also increasingly being used as reference points.