Building Regulations vs Planning Permission: What's the Difference?

When planning a home improvement project such as a house extension, loft conversion, garage conversion, or even a new build, many homeowners assume that planning permission and building regulations are the same thing. In reality, they are two separate approvals that serve different purposes.

Understanding the difference between planning permission and building regulations in the UK is essential before starting any building project. In this guide, we explain what each approval involves, when they are required, and how they affect your project.

What is Planning Permission?

Planning permission is approval from your local council that allows you to carry out certain building works on your property. The purpose of planning permission is to ensure that developments are appropriate for the surrounding area and do not negatively affect neighbours, the environment, or local infrastructure.

Local planning authorities assess applications based on several factors including:

• The size and scale of the proposed development

• The appearance and design of the building

• Impact on neighbouring properties

• Parking and access

• Local planning policies

  
  

Planning permission is commonly required for larger building projects such as:

• Large house extensions

• New build homes

• Housing developments

• Barn conversions

• Major structural alterations

  
  

In some cases, smaller projects may fall under permitted development rights, meaning formal planning permission may not be required.

What are Building Regulations?

While planning permission focuses on how a development affects the surrounding area, building regulations focus on how the building is constructed.

Building regulations ensure that all construction work meets national safety and performance standards. These regulations cover important aspects such as:

• Structural safety

• Fire safety

• Energy efficiency

• Ventilation

• Insulation

• Drainage

• Accessibility

  
  

All building work must comply with building regulations, even if planning permission is not required.

Projects that typically require building regulation approval include:

• House extensions

• Loft conversions

• Garage conversions

• Structural alterations

• New build homes

  
  

To obtain approval, detailed building regulation drawings are usually prepared and submitted to either the local authority building control department or an approved inspector.

Key Differences Between Planning Permission and Building Regulations

Although both approvals are important, they serve very different roles within the construction process.

Planning Permission	Building Regulations
Controls how developments affect the surrounding area	Controls how buildings are constructed
Assessed by the local planning authority	Assessed by building control officers
Focuses on design, size, and appearance	Focuses on safety, structure, and energy efficiency
Not always required	Usually required for most building work

In many cases, a project will require both planning permission and building regulations approval before construction can begin.

When do you need both?

Many common home improvement projects require both approvals.

For example:

House Extensions

Extensions often require planning approval depending on size and design, while building regulations ensure the structure is safe and energy efficient.

Loft Conversions

Planning permission may be required depending on the design, while building regulations will always apply to structural elements, insulation, and fire safety.

New Build Homes

New houses must obtain full planning permission and comply with all building regulations.

Why Professional Drawings Are Important

One of the most important steps in the approval process is preparing accurate architectural drawings. These drawings are used for both planning applications and building regulation submissions.

Professional design drawings help ensure that:

• Your project complies with planning policies

• Construction meets building regulation standards

• Potential issues are identified early

• Builders can price the project accurately

  
  

Working with experienced designers can also help streamline the approval process and reduce delays.

The Typical Approval Process

For most residential projects, the process generally follows these stages:

1. Measured building and site survey

2. Concept design and layout planning

3. Preparation of planning drawings (if required)

4. Planning application submission

5. Building regulation drawings and technical details

6. Building control approval before construction

   
   

This structured approach ensures your project is compliant before work begins on site.

Getting Expert Guidance for Your Project

Understanding the difference between planning permission and building regulations is an important first step when planning a building project. However, navigating the approval process can sometimes be complex, particularly for larger projects or properties with planning constraints.

At Plan My House, we support homeowners through the entire design and approval process, including:

• Building and site surveys

• Planning applications and approvals

• Building regulation drawings and submissions

• 3D visualisations

• Construction cost advice

• Project management support

  
  

Our goal is to make the process straightforward while helping you design a space that works for your home and lifestyle.

Start Planning Your Project

Whether you are considering a house extension, loft conversion, garage conversion, or new build home, understanding the approvals required is essential for a successful project.

If you are planning a project and need professional advice or architectural drawings, the team at Plan My House can help guide you from initial concept through to approvals and construction. Contact us here -> Contact Us