Proportionate sustainability statements for small schemes

A sustainability statement for one house or a three-unit scheme should be two or three pages, and most of what gets submitted is either a 40-page document copied from a major application or a single paragraph that satisfies nobody. The reason for the muddle is that the policies being applied were written for larger schemes, and a local validation list then requires "a sustainability statement" from every applicant without saying what that means at this scale.

The way through is to read the policy, list the requirements that actually apply to a scheme of your size, and answer each one with the shortest sufficient evidence. Where a requirement needs a calculation, provide it. Where it needs a statement of intent that a condition can secure, provide that instead.

What a minor scheme is actually being asked for

Councils want three things from a small scheme, whatever the document is called. Confirmation that the building meets the current Building Regulations standards and that the applicant understands which ones apply. Confirmation of any locally specific requirement, most often water efficiency and sometimes a renewable energy or carbon target. And enough detail that a condition can be drafted and later discharged.

What they do not need on a single dwelling is an energy hierarchy narrative, a district heating feasibility study, a whole life carbon assessment or a BREEAM pre-assessment. Those belong to different scales of development, and volunteering them signals that the document was not written for this application.

Be careful about one thing. Do not confuse the sustainability statement with the energy calculations. An SAP calculation demonstrating compliance with Part L is a building control submission, and a council cannot normally require the full calculation at planning stage, though it can ask what standard is being targeted and how.

Reading the policy to find the real requirement

Open the adopted local plan and find the sustainable construction policy. Then read three things: the policy wording, the supporting text, and any threshold stated.

Thresholds are what decide most of this. Many policies apply a carbon reduction requirement to major development only, or to schemes above a floorspace figure, or to residential development of a stated number of units. Where a threshold excludes your scheme, say so in one sentence and move on. Where a policy applies to all development, it usually asks for design measures rather than numerical targets.

The requirement that most often applies at every scale is water efficiency. In England, an optional higher standard of 110 litres per person per day can be applied through planning policy where the local plan has justified it, and that requirement is delivered through the Building Regulations with a planning condition securing it. If your council's plan includes it, the statement needs one line committing to it and the condition follows.

In London there are additional layers, including the energy hierarchy and reporting requirements in the London Plan, though most of the numerical obligations apply to major development. Check the borough's own validation list, which is where small-scheme requirements are usually set out.

Items that need a calculation and items that do not

The distinction saves the most time.

Two of those deserve a note. Overheating under Part O is assessed at building control, but the planning drawings determine whether compliance is achievable, because glazing area, orientation and the ability to open windows on a noisy or unsafe elevation are fixed by the planning permission. A scheme with a fully glazed south elevation and no shading can pass planning and fail Part O, and the fix at that point is a redesign.

And where biodiversity net gain applies, it is a separate statutory regime rather than a paragraph in a sustainability statement. The statutory metric is expected to be completed by a competent person under the Environment Act 2021 regime, and the Biodiversity Net Gain Assessment is the place for it.

Water, energy and materials in one short document

For a single dwelling, this structure works and rarely attracts a further information request:

1. The proposal and its scale, in two sentences, with the policy threshold position stated.
2. Energy: the fabric approach with indicative U-values, the heating and hot water strategy, the ventilation strategy, and the standard being targeted.
3. Low carbon technology: what is proposed, where it goes, and its indicative capacity or area, cross-referenced to the drawing.
4. Water: the litres per person per day standard being met and how.
5. Overheating: orientation, glazing proportions, shading and purge ventilation, with the Part O route named.
6. Materials: the principles applied, such as responsibly sourced timber and locally sourced aggregate where practical, without inventing certifications you will not obtain.
7. Waste: construction waste handling and the in-use bin and recycling provision, shown on the site plan.
8. A list of the conditions you propose, so the officer can lift them.

Two to three pages covers it. Our note on energy statements for warehouse and logistics schemes shows what the same discipline looks like at the other end of the scale, where the calculations really are required.

Where a checklist beats a narrative

Several councils publish a sustainability checklist. Where one exists, use it and nothing else, because the officer's report will be written from it.

Even where no checklist is published, a table answering each policy criterion in turn beats prose. It lets the officer tick the policy off, it makes omissions obvious to you before submission, and it avoids the risk of a narrative that talks warmly about sustainability without answering the question asked.

An illustrative comparison. Two applications for single dwellings in the same district. One submits a nine-page narrative about climate change, renewable energy and sustainable communities, with no mention of the local water efficiency requirement. The other submits a two-page table: policy criterion, response, evidence location, proposed condition. The second is validated and reported without a further information request. The first attracts a request for the water standard and loses three weeks.

Avoiding commitments you cannot deliver

The real risk in a short statement is over-promising, because everything in it becomes conditionable.

The recurring traps:

• a photovoltaic array sized in the statement but never checked against roof pitch, orientation or structure
• an air source heat pump located where the noise assessment will not support it
• a rainwater harvesting system nobody intends to install
• a green roof on a structure designed for a tiled pitched roof
• a carbon reduction percentage quoted without a calculation behind it
• a certification target that brings a cost and a process the project has not budgeted for

State only what the drawings show and the budget supports. Where something is possible but not certain, say it is being considered rather than committing to it, because a condition drafted from an aspiration has to be discharged or varied later.

The Sustainability Statement and, where energy detail is needed, the Energy Statement should agree with the drawings and with each other. Contradictions between the two are the most common reason a small submission gets queried.

Length and structure that gets validated

Aim for two to three pages on a single dwelling, four or five on a small scheme of several units. Number the sections against the policy criteria. Put the proposed conditions at the end. Reference drawing numbers rather than describing drawings in words.

And date it, name the author, and say what it is: a planning-stage statement of the sustainability approach, with detailed compliance to be demonstrated at building control. That sentence prevents the misunderstanding that generates most of the follow-up correspondence.

This is general guidance, not legal advice; check your council's published local validation list and adopted policies, and take advice from a qualified professional, before relying on it.

Draft your sustainability documents on PlanScope, then send them for professional review. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.