Planning Permission vs Building Regulations: A Norfolk Guide

The difference between planning permission and Building Regulations often causes confusion before a home extension or renovation. They are separate systems, and approval under one does not automatically mean that the other has been satisfied.

Understanding the difference at the beginning helps you appoint the right people, build a realistic programme and avoid discovering a missing approval when work is due to start.

What planning permission considers

Planning focuses mainly on whether the proposed development is acceptable in its location. Matters can include the size and appearance of an extension, its relationship with neighbouring homes, access, heritage and the character of the surrounding area.

Some domestic work may fall within permitted development rights, but those rights have limits and conditions. They can also be restricted by the type of property, earlier alterations, a planning condition, an Article 4 Direction or a sensitive location. The Planning Portal extension guidance is a useful starting point, but project-specific advice is important.

If you intend to rely on permitted development, consider applying for a lawful development certificate for the proposed work. This provides a formal decision on its lawfulness for planning purposes; it does not replace Building Regulations approval or other necessary consents.

What Building Regulations consider

Building Regulations are concerned with how the work is designed and constructed. They cover areas such as structural safety, fire precautions, insulation, ventilation, drainage, electrical safety and access.

Most house extensions require Building Regulations approval even when planning permission is not required. Building Control inspections then take place at important stages so that work can be checked before it is covered.

For an ordinary house extension, you can use local authority Building Control or a registered building control approver. Agree the application route and inspection stages before work begins, and arrange the final inspection and completion paperwork with your provider. The GOV.UK Building Regulations application guide explains the available routes.

Why a project may need both

A two-storey extension might receive planning permission because its position and appearance are acceptable. It will still need structural calculations, compliant foundations, insulation, drainage and fire-safety details. Conversely, a technically sound design can still be refused planning permission if its impact or appearance is unacceptable.

Listed buildings add another layer. Listed building consent may be required for alterations that affect the building’s special character, including some internal work that homeowners may not expect.

Where to check planning requirements in Norfolk

Start with the planning authority responsible for your property. North Norfolk District Council’s planning guidance explains permitted development, applications and pre-application advice for its area. If your property is within the Broads Authority’s executive area, the Broads Authority is the local planning authority. Check the property boundary rather than relying on the village name alone.

When should approvals be arranged?

Ideally, the route should be established before a fixed construction price and start date are agreed. A clear package of drawings, structural information and specifications allows builders to price the same scope and reduces assumptions.

Starting too early can cause delays if details need to be redesigned, materials changed or completed work opened for inspection.

A practical pre-start checklist

• Confirm whether planning permission or permitted development applies.
• Check whether the property is listed or within a conservation area.
• Choose the appropriate Building Regulations application route and agree who will book inspections.
• Obtain structural calculations where required.
• Check Party Wall Act responsibilities separately.
• Make sure planning conditions are discharged at the correct time.
• Keep the approved drawings, decisions and completion paperwork together.

Frequently asked questions

If my extension is permitted development, can I start building?

Not necessarily. Building Regulations, Party Wall requirements, restrictive covenants and other permissions may still apply.

Does the builder arrange every approval?

Responsibilities should be agreed in writing. Some clients appoint a designer to handle approvals, while some design-and-build arrangements include more of the process.

What happens if drawings change?

The designer, Building Control and planning adviser should be consulted before significant changes are built.

Stellar Construction provides practical support from design through to construction. Explore our Norfolk extension service or contact our team.