Party Wall Act Checker

How to use the Party Wall Act Checker

1. Describe your proposed works — extension, loft conversion, excavation, etc.
2. Answer questions about proximity to the boundary and neighbouring properties.
3. The checker identifies which sections of the Act (1, 2, or 6) may be triggered.
4. Get guidance on the notice period and next steps if a party wall notice is required.

Why use this tool

• Identifies whether your project triggers the Party Wall etc. Act 1996 before work starts.
• Explains which section applies — new wall on the boundary, works to existing party structures, or excavation near foundations.
• Helps you serve the correct notice within the required timeframe, avoiding legal disputes with neighbours.

The Party Wall etc. Act 1996 applies in England and Wales and requires anyone planning certain types of work near a shared boundary to notify the adjoining owner. Failing to serve the correct notice is not just a legal risk — it can result in injunctions that stop your project entirely. The Act covers three main scenarios: building a new wall on or at the boundary (Section 1), work to an existing party wall or party structure (Section 2), and excavation within 3 or 6 metres of a neighbouring building's foundations (Section 6). This checker helps you determine which, if any, of these apply to your project.

Part of Builder Tools Utilities — construction tools for UK tradespeople.