When planning a home extension, loft conversion, new build, commercial development or property renovation, one of the first questions many property owners ask is: Do I need planning permission or building regulations approval?
Although these terms are often used interchangeably, planning permission and building regulations are not the same. They are separate legal processes that assess different aspects of a construction project. In many cases, a project may require both. In others, you may need one but not the other.
Understanding the difference before work begins can help you avoid costly delays, redesigns, enforcement action and problems when selling or refinancing a property. It can also make it easier to appoint the right professionals and prepare the correct drawings and supporting documents.
Put simply:
- Planning permission controls what you can build and whether a proposed development is acceptable in a particular location.
- Building regulations control how the development must be designed and constructed to meet required standards.
Planning considerations may include the appearance of a building, its size, its use and its effect on neighbouring properties and the surrounding area. Building regulations, by contrast, focus on technical matters such as structural safety, fire protection, insulation, ventilation, drainage, accessibility and energy efficiency.
If you are unsure which approvals apply to your project, professional guidance can help you establish the requirements before construction begins. Planning Permission Services can support you through the planning process, while Building Regulations Services can help ensure that your technical designs are suitable for building control approval.
What Is Planning Permission?
Planning permission is approval from the relevant local planning authority to carry out certain types of development.
The planning system is primarily concerned with the use and development of land. It considers whether a proposal is appropriate for its location and whether it complies with national planning policy and local planning policies.
When assessing a planning application, the local planning authority may consider factors such as:
- The size, scale and design of the proposed development
- The appearance and external materials of the building
- The impact on neighbouring properties
- Privacy and overlooking
- Daylight and sunlight
- Access, parking and highway safety
- The use of the building or land
- The effect on the character of the local area
- Environmental and ecological considerations
- Heritage restrictions
- Conservation areas and listed buildings
Planning permission is therefore concerned with the principle of development. It asks questions such as the following:
Is this type of development acceptable on this site?
Is the proposed building too large or visually intrusive?
Will the project adversely affect neighbouring properties?
Is the proposed use appropriate for the area?
Planning permission does not confirm that a building will be structurally safe or that its construction details comply with building regulations. Even when planning permission has been granted, separate building regulations approval may still be required.
When Might You Need Planning Permission?
Planning permission may be required for projects such as:
- Large house extensions
- New-build homes
- Major alterations to an existing building
- Some loft conversions
- Commercial developments
- Changes of use
- New outbuildings that exceed permitted development limits
- Developments in conservation areas
- Certain works to listed buildings
- Developments where permitted development rights have been removed or restricted
However, not every construction project requires a full planning application. Some projects may be permitted under permitted development rights, which allow certain types of work to be carried out without submitting a standard planning application. These rights are subject to detailed conditions and limitations and may be restricted in certain locations or through local planning controls.
It is important not to assume that a project is automatically permitted development. The rules can depend on the type of property, its location, previous alterations and any planning restrictions affecting the site.
For greater certainty, property owners may wish to obtain professional planning advice or apply for a lawful development certificate where appropriate.
Considering an extension, conversion or new development? Planning Permission Advice can help you assess the planning requirements and prepare a suitable application.
What Are Building Regulations?
Building regulations are legal standards that govern the design, construction and alteration of buildings.
Their purpose is to help ensure that buildings are safe, healthy, accessible, energy-efficient and suitable for use. Building regulations address the technical performance of a project rather than whether the development is acceptable in planning terms.
Depending on the project, building regulations may cover:
- Structural stability
- Foundations
- Fire safety and means of escape
- Resistance to moisture
- Ventilation
- Drainage and waste disposal
- Sound insulation
- Electrical safety
- Heating systems
- Energy efficiency
- Thermal insulation
- Accessibility
- Protection from falls and impacts
- Safe glazing
- Water efficiency
Building regulations apply to many types of new construction, extensions, conversions and alterations. They may also apply to particular replacement or installation works, including certain changes to electrical systems, heating systems, windows, doors and roofing.
Building regulations approval is separate from planning permission. A project may comply with planning policy but still fail to meet building regulations if its structural, fire-safety, insulation or technical details are inadequate.
How Is Building Regulations Approval Obtained?
For projects that require approval, the work may need to be assessed by a building control body.
Depending on the project and location, this may involve a local authority building control service or a registered building control approver. The appropriate process can vary, particularly for higher-risk buildings.
Common application routes include:
Full Plans Application
A full plans application provides detailed technical information before construction begins. It may include architectural drawings, structural calculations, specifications and other supporting information.
This route can provide greater certainty because the proposed work is assessed before construction progresses. It is often suitable for more complex projects, major extensions, conversions and new buildings.
Building Notice
A building notice may be used for certain smaller or less complex projects. It generally involves less detailed information at the application stage, but the work must still comply with all relevant building regulations.
A building notice does not provide the same level of formal plan approval as a full plans application.
Competent Person Schemes
Some specialist work may be completed by installers registered under a competent person scheme. In eligible circumstances, the installer may be able to certify that the work complies without the property owner making a separate building regulations application.
Building Regulations vs Planning Permission: The Main Differences
| Planning Permission | Building Regulations |
|---|---|
| Controls whether development is acceptable | Controls how construction must be carried out |
| Focuses on land use and development | Focuses on technical design and construction |
| Considers appearance and visual impact | Considers structural safety and performance |
| Assesses the impact on neighbours and the local area | Assesses health, safety, accessibility and energy efficiency |
| Usually handled by the local planning authority | Usually handled through a building control body |
| May involve consultation with neighbours and statutory bodies | May involve technical checks and site inspections |
| Determines whether development can proceed in planning terms | Helps ensure the completed work meets required standards |
The easiest way to remember the distinction is:
Planning permission is about what you can build and where. Building regulations are about how you build it safely and correctly.
Although the two systems are separate, they often overlap. The design approved through planning may need further technical development to demonstrate compliance with building regulations.
Do You Need Both Planning Permission and Building Regulations Approval?
Many projects require both planning permission and building regulations approval.
For example, a large rear extension may require planning permission because of its size, location or impact on neighbouring properties. It may also require building regulations approval because the foundations, structure, insulation, drainage, ventilation and fire safety must meet technical standards.
However, the requirements vary from project to project.
Projects That May Need Both
Examples may include:
- Major house extensions
- New-build homes
- Large commercial developments
- Some loft conversions
- Significant changes of use
- Major building alterations
- Complex property conversions
Projects That May Need Building Regulations but Not Planning Permission
Some work may be permitted development or may not require planning permission but can still require building regulations approval.
Examples may include:
- Certain internal structural alterations
- Some loft conversions
- Some garage conversions
- The installation or replacement of particular building systems
- Certain replacement windows and doors
- Some changes involving plumbing or electrical work
Permitted development rights do not remove the requirement to comply with building regulations or obtain other necessary approvals.
Projects That May Need Planning Permission but Limited Building Regulations Involvement
In some circumstances, planning permission may be required for a development or change of use while the building regulations implications are limited. However, this depends on the nature of the work and the condition and use of the property.
Because every project is different, it is advisable to obtain project-specific advice rather than relying on general examples.
Why Planning Permission Does Not Replace Building Regulations Approval
A common misunderstanding is that receiving planning permission means that all legal and technical requirements have been satisfied.
This is not correct.
Planning approval may confirm that the local authority accepts the principle, scale and appearance of a development. It does not normally provide detailed approval for structural calculations, insulation specifications, fire protection, drainage layouts or construction methods.
For example, planning drawings may show the size and external appearance of an extension. Building regulations drawings may then provide more detailed information about:
- Foundation design
- Wall and floor construction
- Roof build-ups
- Thermal performance
- Insulation
- Structural beams
- Fire separation
- Ventilation
- Drainage
- Electrical and mechanical systems
The project must satisfy both processes where they apply.
Why Building Regulations Approval Does Not Replace Planning Permission
The reverse is also true.
Building control approval does not confirm that a development is acceptable under planning policy. A technically sound building may still be unauthorised if it has been constructed without required planning permission.
For example, an extension may have suitable foundations, insulation and structural support but still be too large for the site or have an unacceptable impact on a neighbouring property.
Building regulations and planning approval are therefore not alternatives. They address different legal and technical requirements.
What Happens If You Start Work Without the Required Approval?
Starting work without the necessary approvals can create significant problems.
If planning permission was required but not obtained, the local planning authority may investigate the development and take enforcement action. Depending on the circumstances, the owner may need to submit a retrospective application, modify the development or remove unauthorised work.
If building regulations approval was required but not obtained, the work may need to be inspected and assessed. Retrospective approval may be possible in some situations, but alterations or opening-up works may be required to demonstrate compliance.
Failure to comply can also create practical difficulties when:
- Selling the property
- Remortgaging
- Obtaining insurance
- Valuing the property
- Completing future renovations
- Providing compliance documentation to buyers
GOV.UK notes that failure to comply may lead to enforcement action, fines or requirements to correct defective work. A lack of appropriate certification can also cause difficulties when selling a property.
Addressing approval issues early is usually more straightforward and cost-effective than trying to resolve them after construction has begun.
How Professional Design Support Can Help
Planning and building regulations requirements can become complex, particularly where a project involves extensions, conversions, structural alterations, heritage restrictions or challenging site conditions.
A professional design team can help coordinate the process from the initial concept through to technical design and approval.
Depending on the services offered, support may include:
- Initial feasibility assessments
- Planning advice
- Site surveys
- Existing and proposed drawings
- Planning application drawings
- Design and access statements
- Building regulations drawings
- Technical specifications
- Coordination with structural engineers
- Planning application submissions
- Responses to planning queries
- Building control submissions
- Construction-stage design support
Working with experienced professionals can help identify potential constraints before significant time and money are invested in a design.
Architectural Design Services can help develop a proposal that responds to both planning requirements and the practical needs of your project.
For projects that require detailed technical information, can support the preparation of coordinated drawings and specifications for building control approval.
Should You Apply for Planning Permission or Building Regulations First?
There is no single answer for every project.
For developments where planning approval is uncertain, it may be sensible to establish whether the proposal is acceptable in planning terms before investing heavily in detailed technical design.
However, building regulations requirements can affect the layout and design of a project. Issues such as structural design, fire safety, access, drainage and energy performance may influence the final proposal.
For more complex developments, early coordination between planning and technical design professionals can help reduce the risk of major changes later.
A well-managed process may involve:
- Reviewing the site and project objectives
- Identifying planning constraints
- Assessing permitted development rights where relevant
- Preparing initial design proposals
- Obtaining planning advice or submitting a planning application
- Developing the approved design into detailed technical drawings
- Submitting the building regulations application
- Coordinating inspections during construction
- Obtaining the appropriate completion documentation
The right approach depends on the type, scale and complexity of the project.
Frequently Asked Questions
Is planning permission the same as building regulations approval?
No. Planning permission and building regulations approval are separate processes.
Planning permission considers whether development is acceptable in a particular location. Building regulations focus on the technical design and construction of the project.
Can I get planning permission without building regulations approval?
You may be able to obtain planning permission without submitting a building regulations application at the same time. However, if building regulations apply, you will still need to address them before or during construction.
Planning permission does not remove the requirement to comply with building regulations.
Do permitted development rights mean that building regulations do not apply?
No. Permitted development rights relate to planning requirements. A project carried out under permitted development may still require building regulations approval.
Do I need building regulations approval for an extension?
Most extensions will require building regulations approval because they involve construction work that must meet standards relating to structure, fire safety, insulation, ventilation and other technical matters.
The exact requirements depend on the project.
Do I need planning permission for a house extension?
Some extensions can be completed under permitted development rights, provided they meet relevant conditions and limitations. Others require a planning application.
The rules can depend on the property type, location, size of the extension and previous development.
Can I start building once planning permission is approved?
Not necessarily. If building regulations approval is required, you should ensure that the appropriate building control process is in place before starting work.
Other approvals or legal requirements may also apply, including party wall matters, listed building consent and conditions attached to the planning permission.
What is the difference between planning drawings and building regulations drawings?
Planning drawings communicate the proposed development and its relationship to the site and surrounding area.
Building regulations drawings provide more detailed technical information to demonstrate how the building will meet applicable standards.
Can I apply for retrospective building regulations approval?
In some cases, retrospective approval may be available for work that was completed without the required approval. The process is commonly referred to as regularisation, and the local authority may require inspections, evidence or corrective work before issuing a certificate.
Get the Right Support Before Your Project Begins
Understanding the difference between building regulations and planning permission is an important first step in any construction or renovation project.
Planning permission determines whether a proposed development is acceptable in terms of land use, design and local impact. Building regulations ensure that the work is designed and constructed to meet required standards for safety, health, accessibility and performance.
Many projects require both, and the two approval processes should be considered early to avoid delays, unexpected costs and changes during construction.
Whether you are planning a home extension, loft conversion, new build, commercial project or major renovation, obtaining professional guidance can help you understand the approvals required and prepare the appropriate documentation.
Contact us to discuss your project and find out how our planning, architectural design and building regulations services can support you from the initial concept through to approval and construction.
