Starting an extension is exciting, but before any soil is turned, it’s essential to meet your legal obligations under the Party Wall etc. Act 1996. One of the most common triggers for serving a Party Wall Notice is foundation work — an area covered in detail by Section 6 of the Act.
This section exists to ensure that when excavation is carried out close to a neighbouring property, the structural safety of both sites is protected. By following the correct procedures, you not only avoid disputes but also set the tone for a cooperative and transparent build.
When the Act Applies to Foundations
Under Section 6, you must serve a notice if you plan to:
- Excavate within 3 metres of a neighbouring structure and to a deeper level than its foundations.
- Carry out foundation work that could impact lateral support or cause ground movement affecting an adjoining property.
This applies to all types of foundations — from traditional strip/trench systems to raft foundations and piled systems. Even relatively small trenches for drainage can fall under these rules if they meet the criteria.
Why Notices Matter
Foundation work is the structural base of your extension. Poorly planned excavation can cause movement, cracking, or instability to neighbouring buildings. Serving a Party Wall Notice ensures:
- Early communication with neighbours about the scope of work.
- Clarity over methods, materials, and timelines.
- Opportunity for neighbours to consent, request modifications, or appoint surveyors.
It transforms a potential flashpoint into a chance for cooperation.
Key Considerations Before You Break Ground
- Depth & Design – Understand how deep you’ll be digging and whether this is below your neighbour’s foundation level.
- Proximity – Measure accurately; within 3m often triggers the Act.
- Risk Management – Factor in soil type, vibration, and support requirements.
- Access Needs – Plan how you’ll gain access if work requires stepping onto neighbouring land.
- Timelines – Serve notices early to avoid project delays.
Beyond Compliance: Neighbourly Construction
Although the Party Wall Act sets the legal framework, its true value lies in fostering mutual respect between neighbours. Explaining your plans, listening to concerns, and offering reassurance can go a long way in ensuring the build is smooth and stress-free.
Proactive communication builds trust — something just as important as concrete when laying strong foundations.
Final Word
Your extension’s foundation is more than a physical base — it’s the starting point for a legally compliant, neighbour-conscious project. Serving the correct Party Wall Notices under Section 6 is both a legal duty and a mark of professionalism.
For expert guidance and the UK’s most cost-effective Party Wall surveying services, contact team@simplesurvey.co.uk today.