When Do You Need an Energy Statement in the UK?

When Do You Need an Energy Statement in the UK?

If you’re preparing a planning application, you may be asking whether your development requires an Energy Statement.

Across the UK, local authorities increasingly request Energy Statements to demonstrate compliance with sustainability and carbon reduction policies. However, requirements vary depending on the size, location and type of project.

If you’re unfamiliar with the fundamentals, you may first want to read our guide on What Is an Energy Statement and Why Is It Required? before determining whether your scheme needs one.

This article explains exactly when you need an Energy Statement in the UK and how to confirm whether it applies to your project.

🔎 What Typically Triggers the Requirement?

In most cases, councils request an Energy Statement when a development creates measurable environmental impact. Consequently, larger or more complex schemes are more likely to require one.

Common triggers include:

New build residential developments
Apartment blocks
Commercial buildings
Mixed-use schemes
Major refurbishments
Change of use projects

If your proposal increases floor area significantly or introduces multiple dwellings, your local authority will likely expect an Energy Statement as part of your planning submission.

For a full breakdown of what the report includes, see our Energy Statements for Planning Applications service page.

🏠 Major Developments

Under UK planning guidance, a “major development” usually means:

10 or more residential units
A site area of 0.5 hectares or more
Commercial floor space exceeding 1,000m²

Where a scheme qualifies as major development, councils almost always require a formal Energy Statement. Because major projects generate higher carbon emissions, planning officers expect detailed modelling and mitigation strategies.

🌆 Developments in London

Location plays a significant role. If your development sits within a London borough, the likelihood of needing an Energy Statement increases substantially.

The London Plan sets strict carbon reduction targets and follows the “Be Lean, Be Clean, Be Green” hierarchy. As a result, most London residential and commercial schemes require structured energy modelling.

In these cases, the Energy Statement must demonstrate:

Carbon reductions beyond Building Regulations
Fabric-first improvements
Low-carbon heating systems
Renewable energy integration
Overheating risk mitigation

London developments frequently require Overheating Assessments (Part O / TM59) alongside the Energy Statement to address thermal comfort.

In London, the requirement becomes significantly more likely. Under the London Plan, boroughs enforce stricter carbon reduction thresholds and require compliance with the “Be Lean, Be Clean, Be Green” energy hierarchy. Therefore, even medium-sized developments often require detailed modelling and overheating assessments.

If your scheme is located within Greater London, review our guide to Energy Statements London for borough-specific compliance requirements.

🏢 Commercial Developments

Commercial schemes commonly trigger the need for an Energy Statement. These include:

Offices
Retail premises
Industrial units
Warehouses
Mixed-use developments

Such projects typically require SBEM Calculations to quantify energy demand and carbon emissions. Because commercial buildings often contain complex services, accurate modelling becomes essential.

🏡 Residential Developments

New houses and apartment schemes often require:

SAP Calculations
Carbon emission projections
Fabric efficiency analysis
Airtightness assumptions
Renewable energy proposals

In addition, many councils expect alignment with future Air Tightness Testing and overheating standards. Therefore, even relatively modest residential developments may require an Energy Statement depending on local policy.

🔄 Change of Use and Large Refurbishments

Not every project triggers this requirement. Small extensions or minor alterations rarely require an Energy Statement.

However, larger change-of-use schemes often do. For example:

Converting offices into residential units
Subdividing large houses into flats
Redeveloping commercial buildings

In these situations, increased occupancy or floor area typically results in new energy performance obligations.

📋 How to Check If You Need an Energy Statement

To confirm whether your project requires one, follow these steps:

1️⃣ Review your local authority’s planning validation checklist.
2️⃣ Confirm whether your development qualifies as “major.”
3️⃣ Check if your site falls within London or another sustainability-focused authority.
4️⃣ Assess whether the scheme significantly increases dwellings or floor area.

If uncertainty remains, we can review your drawings and provide clear guidance.

🚀 Why Early Preparation Matters

Even if your council does not explicitly request an Energy Statement, preparing one early offers advantages.

Firstly, energy modelling highlights potential compliance issues before submission. Secondly, it allows design adjustments while flexibility still exists. Finally, early preparation reduces planning delays and avoids unexpected conditions.

Proactive compliance demonstrates professionalism and strengthens your overall planning application.