BREEAM pre-assessment or Sustainability Statement

A BREEAM pre-assessment predicts a certified rating under a third-party scheme. A Sustainability Statement explains how a scheme answers the sustainability policies in the adopted local plan. One is a scoring exercise against a published manual, the other is a policy argument, and a council that asks for both is asking for two different things rather than the same thing twice.

Architects run into difficulty when the pre-assessment is commissioned late. Several credits depend on actions taken before the application is submitted, and a pre-assessment produced after the design is frozen simply records what was lost.

What each document demonstrates

A pre-assessment is carried out by a licensed assessor against a named scheme and version, working through the credits available in each category and recording which are targeted, which are possible and which are not achievable. It produces a predicted score and a predicted rating, and it states the assumptions each credit depends on.

It is a prediction. Certification comes later, through registration, a design stage assessment and a post-construction review, and the rating on the certificate is the one that counts.

A Sustainability Statement is a planning document. It takes the plan's policies on energy, water, materials, waste, adaptation and biodiversity and shows how the proposal responds to each. There is no external verification and no score. Its quality lies in whether it answers the policy on the policy's own terms rather than describing good intentions.

Councils that require a rating usually want the pre-assessment as evidence that the rating is achievable, with the statement explaining the wider policy position.

Certification scheme against policy narrative

The distinction has practical consequences.

A pre-assessment binds you to a scheme version. Schemes are updated, credits are re-weighted, and the version current at registration governs. State the version in the document and check whether the authority's policy refers to a particular one.

A pre-assessment is also assessor-dependent in a narrow sense. Licensed assessors work to the same manual, but the judgement about whether a credit is realistically achievable at concept stage varies, and an optimistic pre-assessment creates a condition you then cannot discharge.

A Sustainability Statement carries no such machinery, and that is its weakness. Without a score, the only discipline is the policy text. Write it as a policy-by-policy response with a heading for each requirement, because that is how an officer will mark it.

Credits that depend on the application

This is the part that costs money when it is missed. Several credit categories require action at a stage that precedes or coincides with the planning application.

Ecology credits generally require a suitably qualified ecologist to be appointed early and their recommendations to be followed, which means the survey has to happen before the layout is fixed rather than after permission.

Transport credits depend on an accessibility calculation and on measures such as cycle provision and a travel plan, all of which are settled on the planning drawings.

Pollution credits cover surface water run-off rates and the emissions performance of heating plant, both of which are agreed with the drainage authority and the energy consultant at application stage.

Materials and waste credits often depend on a pre-demolition audit carried out before anything is knocked down, and on a site waste plan prepared before work starts.

Water credits are a specification matter and can be secured late, which makes them the exception rather than the rule.

Run the pre-assessment alongside the design rather than after it, and use it as a checklist for what the application needs to contain. Where a scheme is coming forward in outline, the credits that depend on detailed design cannot be confirmed, and the choice between outline and full permission changes what the pre-assessment can honestly say.

Conditions requiring a target rating

Where policy requires a rating, the condition usually has two limbs. A design stage certificate to be submitted before development progresses beyond a stated point, and a post-construction certificate to be submitted within a set period after occupation.

Read the wording before you agree to it. A condition requiring a certified rating is a different obligation from one requiring a scheme to be designed to achieve that rating, and the first is enforceable against an outcome you do not fully control.

Two practical points. Ask for the condition to name the scheme version, so a later update does not move the target. And check the trigger point, because a design stage certificate required before any work starts can hold up enabling works that have nothing to do with the assessment.

Where the rating is not achievable without disproportionate cost, that is a viability argument and it needs viability evidence, which behaves differently at application stage than in plan making, as set out in viability at plan making or at application stage.

Post construction verification

The gap between the design stage rating and the as-built rating is where projects come unstuck, and the cause is almost always value engineering.

Credits disappear quietly. A specification substitution that changes the responsible sourcing certification of a material. A commissioning regime trimmed from the contract. A metering strategy simplified. A landscape scheme reduced after the ecologist's recommendations were written into the design stage submission.

Protect the rating in the building contract. List the credit-critical specifications and processes as contractual requirements, keep the assessor engaged through construction rather than recalling them at handover, and require evidence to be collected as the work proceeds. Retrospective evidence gathering is the single most expensive part of certification.

Where both documents are required

Larger non-residential schemes in authorities with a rating policy usually need both, and they should be written to agree with each other.

Use the pre-assessment as the evidence base and the statement as the narrative. Where the statement claims a measure, the pre-assessment should show the credit it supports. Where the pre-assessment assumes something, the statement should commit to it. Contradictions between the two are easy for an officer to spot and hard to explain.

Cross-reference the energy strategy into both, since energy credits and the plan's carbon policy draw on the same modelling. Do the same for drainage, ecology and transport.

Cost and programme implications

Budget for four things rather than one: the assessor's fee for the pre-assessment, the scheme registration and certification fees, the additional consultant inputs certain credits require, and the assessor's time through construction to post-construction review.

The programme point matters more than the cost. Ecology surveys have seasons, pre-demolition audits have to happen before demolition, and a pre-assessment started a fortnight before submission will report credits as unachievable simply because the evidence was never gathered.

Start the pre-assessment when the concept design starts. It is the least costly point at which a rating can be influenced, and the only point at which some credits remain available.

Browse the full list of report types to see how sustainability documents sit alongside energy and ecology work, or enter your postcode on PlanScope to see which reports your scheme is likely to need.

PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval. A BREEAM assessment must be carried out by a licensed assessor, and for specialist technical reports qualified professional input may be required.