On the boundary
A dwarf wall or full-height wall built on the boundary line needs a line of junction notice.
Against a shared wall
If the roof or frame is fixed into, or bears on, the party wall, or a flashing is cut into it, that is party structure work.
Foundations
Even lightweight structures need foundations. Foundations dug within 3 metres of next door's building, and deeper than its own, need an excavation notice. Orangeries, being heavier, often have deeper foundations than people expect.
Typical examples
| Design | Notices usually needed |
|---|---|
| Lean-to conservatory on the back of a semi, 1 m from the boundary | Excavation, if its foundations go below next door's |
| Orangery built up to the boundary | Line of junction and excavation |
| Conservatory roof flashed into the shared wall | Party structure |
Gutters and overhangs
Keep gutters and roof edges on your side of the boundary. Overhanging a neighbour's land needs their agreement; the Act does not give you that right.
Common questions
My conservatory is exempt from planning permission. Does that matter?
No. Planning exemptions do not affect the Party Wall Act.
Where this comes from in the Act
- Section 1: New building on line of junction
- Section 2: Repair etc. of party wall: rights of owner
- Section 6: Adjacent excavation and construction
Links go to the official text of the Party Wall etc. Act 1996 on legislation.gov.uk.