Planning Permission vs Building Regulations: What Is the Difference?

Planning permission and building regulations are often mentioned together, but they control different aspects of building work. Confusing the two can leave a homeowner with a project that has one approval but is still missing another.

Planning is mainly concerned with whether development is acceptable in its location and context. Building regulations set minimum standards for how building work is designed and constructed, covering matters such as safety, structure, energy performance and accessibility.

The planning system guides how land and buildings develop. Depending on the project, a local planning authority may consider:

• size and scale
• position on the site
• external appearance
• effect on neighbours
• highway access
• landscape and trees
• heritage considerations
• use of the building or land
• local and national planning policy

Planning permission does not certify that the structural design is safe or that insulation meets building standards. Those matters sit elsewhere.

Building regulations set standards for building design and construction. Approved Documents in England provide guidance on areas including:

• structure
• fire safety
• site preparation and moisture
• ventilation
• sanitation and hot water
• drainage and waste
• energy performance
• access
• electrical safety
• overheating and other regulated matters

The precise requirements depend on the project. Building control checks plans and/or site work through the chosen approval route.

Yes. A typical home extension may need planning permission because of its size or design and building regulations approval because it creates new structure, walls, roof, drainage and electrical work.

Planning Portal guidance notes that most extensions require building regulations approval, even though some can be permitted development and avoid a full planning application.

Treat the approvals as parallel workstreams. Obtaining planning permission does not remove the need to satisfy building regulations.

Permitted development rights allow certain work to proceed without a full planning application if it stays within defined limits and conditions.

Common examples can include some extensions, roof alterations, outbuildings and solar installations, but the rules vary and rights can be restricted.

A project that qualifies as permitted development may still need building regulations approval. This is one of the most common sources of confusion.

If certainty is important, homeowners can consider whether a lawful development certificate is appropriate for confirming the planning status of proposed work.

Many ordinary internal alterations to an unlisted house do not require planning permission, but building regulations can still apply.

Removing a load-bearing wall, for example, is primarily a structural building-regulations issue rather than a planning matter. New drainage, electrical work or changes affecting fire safety can also require regulated design and certification.

Listed buildings are different because internal alterations affecting special architectural or historic interest may need listed building consent.

A homeowner planning a rear extension may first check whether it falls within permitted development rights. If it does, no full planning application may be needed.

The same extension will still normally need building regulations approval for foundations, structure, insulation, drainage, glazing and other regulated elements.

Read how to plan a home extension for the full sequence from brief to completion.

Some loft conversions can fall within permitted development limits, but building regulations usually remain central because the work affects structure, stairs, fire safety, insulation and often electrics.

Roof alterations may trigger planning requirements if they exceed permitted development limits or affect a protected property.

Do not rely on the fact that a conversion is largely "inside" the existing roof. Dormers and other external changes can have planning consequences.

Many domestic rooftop solar installations in England can be permitted development, but conditions and exceptions apply. Building and electrical requirements still need to be met.

Our solar panel planning permission guide explains the common planning checks for pitched roofs, flat roofs, listed buildings and stand-alone arrays.

Domestic electrical work can come under Part P of the Building Regulations in England, and certain work is notifiable unless completed through an appropriate registered competent-person route.

Electrical safety is also governed by standards such as BS 7671. Current wiring regulations continue to be updated, so use a registered and competent electrician for work that needs design, inspection and certification.

If you are renovating, electrical planning for renovation helps you coordinate circuits and fittings before finishes are complete.

Building control is the process through which compliance with building regulations is checked. Depending on the project and route, plans may be reviewed before work and inspections take place at key construction stages.

Do not wait until the project is nearly finished to involve building control if approval is required. Foundations, insulation and structural work may need inspection before they are covered.

Confirm who books site inspections: the homeowner, designer or contractor. Responsibility should be clear rather than assumed.

When building-control requirements have been satisfactorily addressed, a completion certificate or equivalent documentation provides important evidence that the notified work has been completed through the approval process.

Keep this with structural calculations and trade certificates. It may be requested during a future sale, remortgage or additional building work.

If work was carried out without the required process, retrospective routes can be more complicated, so it is better to resolve approvals before construction.

A planning approval may contain conditions about materials, landscaping, drainage, working details or other planning matters. These need to be discharged or complied with separately from building-control inspections.

Do not assume that a building-control inspector will monitor planning conditions, or that the planning officer will check technical construction compliance.

Keep an approvals schedule showing what each authority or consultant requires.

Planning and building regulations are not the only considerations. Depending on the project, you may also need to think about:

• Party Wall etc. Act procedures
• listed building consent
• conservation-area controls
• freeholder or landlord consent
• drainage agreements
• highways consent
• tree protection
• DNO approvals for generation or large electrical loads
• asbestos management

The project team should identify these early so one missing consent does not delay construction.

At concept stage, create an approvals checklist. Ask:

1. Does planning permission apply?
2. Could permitted development apply instead?
3. Would a lawful development certificate be useful?
4. What building-control route will be used?
5. Is structural engineering needed?
6. Do party wall matters apply?
7. Are there listed-building or conservation constraints?
8. Who will submit documents and book inspections?

Do not appoint a builder on the assumption that all of this will automatically be handled unless the contract clearly includes it.

Proper Trades coordinates construction projects across the Midlands and can arrange the trade teams required once the project scope and approval route are understood.

Proper Trades connects homeowners and businesses across the Midlands with roofing services.

Proper Trades connects homeowners and businesses across the Midlands with request a free trade quote.

For further guidance, read our renovation vs rebuild decision guide.

1. If I have planning permission, do I still need building regulations?

Possibly, and for many building projects the answer is yes. The two systems are separate. Planning approval does not confirm structural, fire, insulation or other technical compliance.

2. If my extension is permitted development, do I need building regulations?

Most house extensions still require building regulations approval even when a full planning application is not required. Check the exact project with building control.

3. Who applies for building regulations approval?

The homeowner, designer, contractor or another appointed person can manage the process depending on the project and agreement. Make responsibility explicit and confirm who books inspections.

4. Do I need planning permission to remove an internal wall?

Ordinary internal alterations in an unlisted house often do not need planning permission, but removing a load-bearing wall normally requires structural design and building-regulations consideration. Listed buildings need separate heritage checks.

5. What happens if I build without the required approval?

The authority may require changes, enforcement action or a retrospective process depending on the circumstances. Missing documentation can also complicate future property transactions. Resolve approvals before work wherever possible.

6. Are building regulations the same across the whole UK?

No. England, Wales, Scotland and Northern Ireland have different regulatory frameworks and guidance. Use the rules that apply where the property is located.

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