PWS West Midlands knowledge guide
Rear Extensions and the Party Wall Act
Rear extensions can engage the excavation and boundary-wall provisions of the Act even where the new building does not touch the neighbour’s house.
Foundations near neighbouring buildings
The common 3-metre test compares the depth of the proposed excavation with the depth of the neighbouring foundations. Modern extension foundations are often deeper than older house foundations, so distance alone is not enough.
Walls at the boundary
A new wall astride the boundary requires written consent. A wall built wholly on the Building Owner’s land but up to the boundary can still require a Line of Junction Notice.
Access and construction details
Drawings should show foundation dimensions, wall position, eaves and weathering. Where work is tight to the boundary, the Award can address access, protection and making good.
Frequently Asked Questions
Does permitted development avoid the Act?
No. Planning status and Party Wall procedure are separate.
Does every extension require notice?
No. It depends on the boundary, excavation and adjoining structures.
Can work begin after consent?
Work must still comply with the notice requirements and any agreed timing or safeguards.
Related guidance
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