Planning a house extension in North London can be a great way to add space and value to your home, but it’s essential to understand the planning and legal requirements before starting. From permitted development rights to party wall agreements, getting it right early can save you time and stress.
1. Do You Need Planning Permission?
Many homeowners are surprised to learn they may not need full planning permission. If your extension meets specific criteria under “Permitted Development Rights” (PDR), you may proceed without applying to the local authority.
Under PDR, you can typically build a single-storey rear extension of up to 3 metres on a terraced or semi-detached house, and up to 4 metres on a detached home. Height and width limits apply, and the materials used must be similar to the existing house.
2. When Planning Permission Is Required
You’ll need full planning permission if:
- Your property is in a conservation area or is a listed building
- The extension exceeds permitted development size or height limits
- You’re building a two-storey extension or altering the roof
- You plan to build forward of the principal elevation
Applications are made through your local borough council and typically take 8 weeks for a decision.
3. Building Regulations Approval
Even if your extension doesn’t require planning permission, it must still comply with UK building regulations. These cover:
- Structural integrity
- Fire safety
- Insulation and energy efficiency
- Drainage and ventilation
- Electrical safety
Building Control will need to inspect the work at various stages. You can use either the local council or an approved private inspector.
4. The Party Wall Act 1996
If your extension affects a shared wall with a neighbour — for example, in terraced or semi-detached houses — you may need a party wall agreement. This is a legal notice served to your neighbours informing them of works near or on the boundary.
If they agree in writing, you can proceed. If they dissent, you’ll need to appoint a surveyor. It’s best to budget for this and start the process early to avoid delays.
5. Conservation Areas and Listed Buildings
North London is home to many conservation areas and heritage properties. In these cases, stricter controls apply. You’ll need to apply for planning permission and may face restrictions on materials, design, and even window styles.
Listed buildings require Listed Building Consent for almost any change — even internal alterations. Work without permission can result in prosecution and fines.
6. Freeholder and Leaseholder Considerations
If you live in a leasehold property or share a freehold, check the terms of your lease or agreement. You may need written consent from the freeholder or other owners before starting work.
7. Access, Rights of Way and Boundaries
Consider how builders will access the site and whether any shared driveways or paths will be affected. Establishing boundaries clearly is essential to avoid future disputes with neighbours.
8. Planning Drawings and Documentation
Even if permission isn’t required, having architectural plans drawn up is strongly advised. These help builders quote accurately, assist with structural calculations, and serve as a record for Building Control.
9. Timelines and Delays
Gathering approvals can take several weeks or months, especially if objections are raised. Start planning early and work with professionals familiar with the local authority processes.
10. Using a Qualified Builder
Choose a builder experienced in North London extensions. They’ll understand local requirements, have relationships with inspectors and know how to avoid common pitfalls.
Conclusion
Extending your home in North London is achievable with the right planning and professional advice. Understanding planning permission, building regulations and legal obligations ensures your project runs smoothly and adds lasting value to your property.
