Whole life carbon assessor competence

There is no licence or register for whole life carbon assessors, so whole life carbon assessor competence is judged on what the person has actually done: assessments completed to the RICS professional standard, familiarity with the reporting template the authority uses, and enough construction knowledge to argue with a structural engineer about a transfer slab. Councils usually expect a suitably qualified author for this work, and professional review before submission is strongly advised.

That absence of a formal qualification is why the appointment question is worth taking seriously. Anyone can produce a spreadsheet of emissions figures. Few can defend the assumptions behind them at committee.

What the assessment has to cover

A whole life carbon assessment reports emissions across the life cycle modules defined in BS EN 15978, not just the materials in the frame.

Product and construction stages (modules A1 to A5) cover extraction, manufacture, transport to site and the construction process itself, including site energy and waste. Use stage modules (B1 to B7) cover maintenance, repair, replacement and refurbishment, plus operational energy and water where reported. End of life modules (C1 to C4) cover demolition, transport, waste processing and disposal. Module D, the benefits beyond the system boundary, is reported separately and never netted off the total.

Upfront carbon, meaning modules A1 to A5, is the figure that drives design decisions, because it is already committed by the time the building opens. An assessor who reports only a single lifetime total has given the design team nothing to act on.

The professional standard it follows

The RICS Whole Life Carbon Assessment for the Built Environment professional standard, second edition, sets the method, the boundaries and the reporting format used across the industry. It replaced the first edition and changed several conventions, including how modules are reported and what has to be disclosed.

In London the whole life carbon assessment also has to follow the Greater London Authority's guidance and be submitted on its template spreadsheet at both application and post-construction stages. An assessor who has not completed that template before will get the reporting structure wrong even where the underlying figures are sound.

Ask which edition of the standard the assessor works to and when they last submitted under the GLA process. Both questions are answered in a sentence by someone doing the work regularly.

Data sources and their quality

The credibility of the assessment sits almost entirely in the data hierarchy.

Product specific environmental product declarations, verified to EN 15804 and in date, sit at the top. Sector average declarations come next. Generic database figures come last, and they are appropriate at concept stage when the specification is not fixed. What fails review is a mixture presented without saying which is which, or a declaration used long after expiry.

Dates matter here in a way people underestimate. Declarations expire, typically after five years, and a figure lifted from a manufacturer's older declaration will be queried by any reviewer who checks.

Watch for four recurring errors: carbon factors applied to the wrong quantity unit, transport distances assumed at a default when the supplier is known, reinforcement rates taken from a rule of thumb rather than the engineer's schedule, and replacement cycles for finishes set optimistically to flatter the B modules.

A competent assessor documents every assumption in a schedule that someone else could check. That is the practical test to apply to a sample report before appointing.

Experience with the reporting template

Most planning refusals or delays on carbon reporting are about presentation rather than substance. Figures reported per square metre of gross internal area, against the right benchmark, in the format the officer expects.

Where the authority publishes benchmarks or aspirational targets, the assessment has to state performance against them and explain any shortfall. Where it does not, the assessor should say which published benchmark has been used and why. Check the current figures at the time of writing, because they are revised.

Benchmarking also has to state the floor area basis. Gross internal area is the usual denominator, and a report that quietly uses a different area measure produces a number that cannot be compared with anything.

Ask to see a redacted previous submission. You will learn more from three pages of someone's actual reporting than from a capability statement.

Verification and review

Independent review is optional. It changes how the assessment is received, particularly on a scheme where the carbon case supports demolition and rebuild rather than retrofit.

A review should test the quantities against the drawings and cost plan, check the data sources and dates, re-run at least one module, and confirm the reporting boundary. Where the report claims reuse or recovery, the reviewer should trace those claims back to the pre-redevelopment audit rather than accepting them as stated.

PlanScope's professional directory is the route to a reviewer who can check and sign off a draft. Our note on what competent person means in planning legislation explains where that phrase carries statutory weight and where it does not, which matters because whole life carbon is not one of the statutory competence regimes.

Coordination with the structural engineer

Substructure and superstructure usually account for the largest share of upfront carbon, so the assessment is only useful if it reaches the engineer while the structural concept is still open.

The decisions that move the number are early ones. Column grid and span. Foundation type and whether piles are needed. Whether an existing frame or basement can be retained. Slab thickness and the choice between concrete, steel and timber. Once those are fixed at technical design, the assessment becomes a measurement exercise rather than a design tool, and the remaining savings sit in cement replacement rates and finishes.

So put the assessor in the room for the structural options meeting rather than sending them the outcome. An hour there is worth a fortnight of reporting afterwards.

An assessor who cannot read a structural drawing will not spot that the engineer has assumed a 300 mm slab where 250 mm would work. And that single line moves more carbon than every finish in the building.

Sequencing with the cost plan helps too. Quantities taken from the same measured schedule the quantity surveyor uses remove an entire category of argument, because nobody has to reconcile two sets of numbers for the same building.

Appointing at concept stage

Appoint before the planning application is drafted, not after. The sequence that works: a concept stage assessment that tests two or three structural options, a design stage assessment that supports the application, and a post-construction assessment where policy requires one.

Fees are usually a small fraction of the structural engineer's, and the savings identified at concept stage often exceed them several times over on a scheme of any size.

Write the deliverables into the appointment. The modules covered, the standard and edition, the template, the number of design options tested, attendance at design team meetings, and who pays for a re-run if the design changes materially. Without that last clause, every revision becomes a variation.

Draft the reporting structure on PlanScope and see all 66 report types your scheme may need, then have a qualified assessor complete and review the figures.

This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.