Building Regulations vs Planning Permission — What’s the Difference?
Building Regulations vs Planning Permission
Two completely different approval systems — and most homeowners confuse them. This guide explains exactly what each one covers, when you need both, and how to apply in England.
If you are planning a home extension, a loft conversion, a garage conversion, or any kind of building work in England, you will almost certainly encounter two different approval systems — planning permission and building regulations. Many homeowners assume they are the same thing, or that getting one means they automatically have the other. This is one of the most common and costly misconceptions in the UK property world.
The reality is that planning permission and building regulations are two entirely separate systems, governed by different legislation, administered by different departments, and concerned with completely different aspects of your project. You may need one, the other, or both — and understanding which applies to your situation is essential before you spend a penny on drawings, fees, or building work.
This guide explains exactly what each system covers, how they differ, when you need both, and how to apply for each one in England in 2026.
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Use the Free Planning Fee Calculator →What Is Planning Permission?
Planning permission is a legal requirement to carry out certain types of development on land or buildings. It is concerned with land use — in other words, whether a particular type of development is appropriate in a particular location, taking into account the impact on the surrounding environment, the character of the area, neighbours, and local planning policy.
Planning permission is administered by your Local Planning Authority (LPA) — usually your local borough, district, or county council. Applications are submitted via the Planning Portal at planningportal.co.uk, and decisions are made against the council's Local Plan and national planning policy, primarily the National Planning Policy Framework (NPPF).
Planning permission is primarily concerned with:
- The visual appearance and design of a building or extension
- The use of land — what a building or site is used for
- The impact on neighbours — overlooking, loss of daylight, noise
- The impact on the street scene and surrounding area
- The principle of development — whether building in a particular location is acceptable
- Access and transport — particularly for larger developments
Crucially, planning permission says nothing about how a building must be constructed. It does not specify wall thicknesses, insulation values, structural requirements, or fire safety measures. Those matters are covered by an entirely separate system — building regulations.
๐ Key Point
Planning permission asks: "Should this be built here, and does it look right?" It is about the principle and appearance of development — not the technical standards of construction.
What Are Building Regulations?
Building regulations are a set of minimum technical standards that govern how buildings must be designed and constructed in England. They apply to most building work and exist to ensure that buildings are safe, energy efficient, accessible, and structurally sound. Unlike planning permission — which is concerned with whether something should be built — building regulations are concerned with how it is built.
Building regulations are administered by Building Control — either your local authority's Building Control department or a government-approved private inspector known as an Approved Inspector or, from 2024, a Registered Building Control Approver (RBCA). You apply for building regulations approval separately from planning permission, and the two processes run independently of each other.
Building regulations cover a wide range of technical requirements, organised into a series of Approved Documents. The most relevant for residential projects include:
| Approved Document | What It Covers |
|---|---|
| Part A — Structure | Structural stability of walls, floors, and roofs |
| Part B — Fire Safety | Fire escape routes, fire resistance, alarms |
| Part C — Moisture Resistance | Damp proofing and weather resistance |
| Part F — Ventilation | Fresh air supply and extraction |
| Part L — Energy Efficiency | Insulation, heating, and energy performance |
| Part M — Accessibility | Access for disabled people |
| Part P — Electrical Safety | Electrical installations in dwellings |
๐ Key Point
Building regulations ask: "Is this built safely and to the correct technical standard?" They apply regardless of whether planning permission was needed — and even apply to some work that does not require planning permission at all.
The Key Differences — Side by Side
| Aspect | Planning Permission | Building Regulations |
|---|---|---|
| Administered by | Local Planning Authority (LPA) | Building Control (local or private) |
| Concerned with | Appearance, use, location, impact | Safety, structure, energy, accessibility |
| When applied | Before work begins | Before and during construction |
| Inspections | One site visit (sometimes) | Multiple inspections during build |
| End document | Decision Notice | Completion Certificate |
| Applies to internal works? | Rarely | Often yes |
| Fee paid to | Your local council (LPA) | Building Control body |
When Do You Need Planning Permission?
Not all building work requires planning permission. Many common household projects are covered by Permitted Development Rights — a set of rules that allow certain types of work to be carried out without a formal planning application, provided specific size and location criteria are met.
You will generally need planning permission for:
- Extensions that exceed Permitted Development limits in size or height
- New dwellings or outbuildings beyond permitted development thresholds
- Changes of use — for example converting a commercial building to residential
- Most work in Conservation Areas, on Listed Buildings, or in National Parks
- Work on a property where Permitted Development Rights have been removed by an Article 4 Direction
- Two-storey extensions or additions that affect a neighbour's boundary or outlook significantly
Before applying, always use our free Planning Portal Fee Calculator to find out exactly how much your application will cost. From April 2026, the standard householder planning application fee is £548 for a single dwellinghouse.
When Do You Need Building Regulations Approval?
Building regulations apply much more broadly than planning permission. Many projects that do not need planning permission still require building regulations approval. In fact, building regulations apply to virtually all structural building work, regardless of whether it requires planning consent.
Projects that typically require building regulations approval include:
- All extensions — including those covered by Permitted Development
- Loft conversions — structural works, fire escape, insulation
- Garage conversions — change of use to habitable space
- New bathrooms or kitchens — drainage and ventilation requirements
- Structural alterations — removing walls, changing roof structure
- New windows and doors — energy efficiency requirements
- Electrical work — new circuits, consumer units, outdoor wiring
- Central heating systems — boiler replacements and new installations
- Underpinning — any structural work to foundations
Some smaller works are exempt from building regulations — for example, like-for-like replacement of windows by a FENSA-registered installer, or minor repair and maintenance work that does not change the fabric of the building.
Can You Need Both at the Same Time?
Yes — and for most significant building projects, you will need both. Planning permission and building regulations are not alternatives to each other. They run as parallel, independent processes and both must be obtained before work begins (or, in the case of building regulations, before and during construction).
๐ Scenario 1 — Large Rear Extension
A rear extension that exceeds Permitted Development limits needs both planning permission (for the design and principle) and building regulations approval (for the structural, insulation and drainage work).
๐ Scenario 2 — Small Rear Extension (Permitted Development)
A small rear extension within Permitted Development limits does not need planning permission — but it does still need building regulations approval before work begins.
๐ Scenario 3 — Internal Alterations
Removing a load-bearing internal wall does not usually require planning permission (as it does not affect the external appearance) — but it does require building regulations approval for the structural work.
๐ Scenario 4 — Listed Building Works
Works to a listed building require Listed Building Consent (a type of planning consent) — which is free to apply for. Building regulations also apply, though the requirements may be modified to respect the historic character of the building.
How to Apply for Planning Permission
Planning applications in England are submitted via the Planning Portal at planningportal.co.uk. The process involves completing the relevant application form, uploading required drawings and supporting documents, and paying the statutory fee.
The fee for the most common application type — a householder application for an extension or alteration — is £548 from 1 April 2026. Use our free Planning Portal Fee Calculator to get an instant estimate for your specific project type before you begin.
The statutory determination period for householder applications is 8 weeks from the date your application is validated. Major applications have 13 weeks. If your application is approved, the planning permission will typically be valid for 3 years, within which time you must commence development.
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There are two main routes to obtaining building regulations approval in England:
Route 1 — Full Plans Application
You submit detailed plans and specifications to Building Control before work begins. Building Control checks them against the regulations and, if satisfied, issues an approval. Inspectors then visit the site at key stages during construction. At the end, a Completion Certificate is issued confirming the work complies. This is the most thorough route and is recommended for larger or more complex projects.
Route 2 — Building Notice
You notify Building Control that work is about to start — typically 48 hours before commencing — without submitting detailed plans upfront. Inspectors visit during construction and check compliance on site. This route is faster but carries more risk — if work does not comply, you may be required to open it up or undo it. It is only suitable for straightforward domestic work.
Building regulations fees are charged separately from planning fees and are calculated based on the nature and estimated cost of the work. Unlike planning fees, building regulations fees are not set nationally — they vary between local authorities and private inspectors. Your Building Control body will provide a quote when you submit your application.
What Is a Completion Certificate and Why Does It Matter?
A Completion Certificate (also called a Building Regulations Completion Certificate) is issued by Building Control once your building work has been inspected and confirmed to comply with the regulations. It is the documentary proof that your works were carried out to the required standard.
The Completion Certificate matters enormously when you come to sell your property. Solicitors acting for buyers will routinely request it as part of the conveyancing process. Without it, a buyer's solicitor may require an indemnity insurance policy to be taken out — which can delay or even jeopardise a sale. In some cases, buyers may simply walk away.
Similarly, if you carried out works without building regulations approval, you may face difficulties when remortgaging, extending your mortgage, or making insurance claims. It is strongly advisable to ensure all notifiable building work is approved and certificated, even if the work was done years ago.
What Happens if You Ignore One or Both?
Carrying out work without the required planning permission or building regulations approval can have serious consequences. They are not the same consequences — but both can be significant:
- No planning permission: Your LPA can issue an Enforcement Notice requiring you to undo the works or return the land to its previous condition. Failure to comply is a criminal offence. The LPA has up to 4 years to take enforcement action for operational development, and up to 10 years for changes of use.
- No building regulations approval: Your local authority can issue an Enforcement Notice requiring the work to be opened up, altered, or demolished. There is no time limit for enforcement action on work carried out without building regulations approval. You may also face difficulty selling the property and issues with insurance.
If you have already carried out works without the necessary approvals, you may be able to apply for retrospective planning permission or a Regularisation Certificate (the building regulations equivalent of retrospective approval). A regularisation application allows Building Control to inspect the completed works and issue a certificate if they comply — though in some cases you may be required to open up walls or floors to allow inspection of concealed work.
๐ท Find a Trusted Local Builder
Once your planning and building regulations approvals are in place, find a vetted local builder to carry out your project.
Find a Trusted Local Builder Near You → →A Practical Checklist — Before You Start Any Building Project
๐ Pre-Build Checklist
Conclusion
Planning permission and building regulations are two distinct, parallel systems that serve very different purposes. Planning permission decides whether your project should be built — where it is, what it looks like, and what impact it has. Building regulations decide how it is built — to what structural, safety, and energy efficiency standards.
For most significant building projects in England, you will need both. Getting confused between the two — or assuming that one covers the other — is a common and potentially costly mistake. Always check both requirements before committing to any building work, and ensure you have the necessary approvals and certificates in place before and after construction.
If your project requires planning permission, the very first step is finding out how much it will cost. Use our free Planning Portal Fee Calculator to get an instant, accurate estimate based on the latest 2026 statutory rates — it takes less than a minute and covers all major application types in England.
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