Excavation works may seem straightforward, but they are among the most heavily regulated construction activities under the Party Wall Act. If your project involves digging foundations near an adjoining property, you could be legally required to notify your neighbour before work begins.

This guide covers the 3m & 6m Excavation Rules Explained, helping homeowners understand their responsibilities under Section 6.

Why Foundation Excavation Requires Special Attention

Foundations provide essential support for buildings. Excavating nearby can affect soil stability and compromise neighbouring structures if not managed correctly.

For this reason, the Party Wall Act establishes distance and depth thresholds that determine when notices must be served.

The 3-Metre Rule

The 3m rule applies when:

• Excavation is within 3 metres of a neighbouring building.

• The proposed foundations are deeper than those of the neighbouring structure.

This is particularly common with modern extensions where deeper foundations are required to meet building regulations.

The 6-Metre Rule

The 6m rule protects neighbouring properties from deeper excavation works.

Projects involving:

• Basement construction

• Piled foundations

• Deep retaining walls

may trigger the 45-degree assessment used under Section 6.

Benefits of Appointing a Party Wall Surveyor

A party wall surveyor can identify whether notices are required, prepare documentation, assess risks, and create legally compliant Party Wall Awards.

Their involvement often prevents disputes and helps maintain good neighbourly relations throughout construction.

Conclusion

The Party Wall Act plays a vital role in protecting neighbouring properties during excavation works. Understanding the 3m & 6m Excavation Rules Explained and seeking advice from an experienced party wall surveyor can ensure your project proceeds safely and legally.