Maximising floor space with an extension is appealing, but the closer you build to your boundary, the more important it is to get the legal and practical details right.
Start With the Boundary—Not the Fence
Your title deeds set out the legal boundary of your land. The fence or wall on site may not perfectly align with that line. Confirming the boundary early helps prevent disputes and informs your design and construction approach.
When the Party Wall etc. Act 1996 Applies
If you intend to build near or on the boundary, the Party Wall etc. Act 1996 may apply. The Act provides a framework to protect both owners when works affect shared or adjacent structures. You’ll usually need to serve a Party Wall Notice if your works involve:
- Building a new wall at the boundary
- Excavating within 3–6 metres of a neighbouring structure (depending on foundation depth)
- Cutting into, altering, or otherwise affecting a shared (party) wall
Your neighbour can consent or dissent. If they dissent, a surveyor (or surveyors) will be appointed to produce a Party Wall Award, setting out how works proceed and how risk is managed.
Minimum Distances From Fences and Neighbouring Extensions
There’s often no fixed minimum distance from a neighbour’s fence if you remain within your boundary and meet planning and Building Regulations. However, good practice is essential:
- Foundations: Avoid conflict between foundations. A structural engineer may recommend a rot-proof separation board or other measures to prevent direct contact.
- Access for maintenance: Ensure you can inspect and maintain your side wall without trespassing.
- Moisture management: Narrow gaps can trap moisture and encourage damp. Consider design details—e.g., negotiated flashings or roof overlaps—to shed water away from any gap.
- Overhangs: Remember that eaves, gutters, and fascias project beyond the wall line. Confirm clearances so overhangs don’t cross the boundary.
Keep Neighbour Relations on Track
Early, open communication with neighbours reduces friction. Document your proposals, share timelines, and respond to concerns. Professional advice—from architects, structural engineers, and party wall surveyors—helps you stay compliant and avoid expensive mistakes or delays.
Planning close to the boundary? Get clear, cost-effective advice before you serve notice or break ground.
Email team@simplesurvey.co.uk—the lowest-cost party wall surveyors across England & Wales—for straightforward guidance, compliant notices, and efficient Party Wall Awards.