PWS Kent knowledge guide
Rear Extensions and the Party Wall Act
A practical guide for homeowners, developers and adjoining owners in Kent, explaining when the Act may apply and how to prepare.
Quick answer
A rear extension may require Notices for boundary walls and for foundations excavated close to a neighbouring building, even where the extension has planning permission.
The two common Party Wall triggers
Extensions frequently engage Section 1 where a new wall is proposed at or near the boundary, and Section 6 where foundations are within three or six metres and meet the depth tests. Both can apply to the same project.
Foundations and neighbouring buildings
The three-metre rule is not simply a distance rule. The proposed excavation must also extend below the neighbour’s foundations. The six-metre rule uses a 45-degree test and is particularly relevant to deeper excavation or some engineered foundation solutions.
Design information that helps
Plans should identify the boundary, proposed wall position, foundation width and depth, and the position of nearby buildings. Sections and structural details allow accurate Notices and reduce uncertainty for adjoining owners.
Local considerations in Kent
Kent combines historic terraces, coastal housing, village properties and expanding commuter towns. The varied age and construction of neighbouring buildings makes project-specific review important, especially for older shared masonry and excavation beside established foundations.
We advise throughout Canterbury, Maidstone, Ashford, Whitstable, Medway, Sevenoaks and towns across Kent. The correct answer depends on the drawings, structural details, neighbouring foundations and ownership—not simply the project description.
How the Party Wall process usually progresses
Start with a review of the architectural and structural information. Where the Act applies, the correct Notice or Notices are prepared and served on the legal adjoining owners. A neighbour may consent, appoint their own surveyor or agree to an Agreed Surveyor. If a dispute arises, the appointed surveyor or surveyors prepare an Award recording the works and reasonable safeguards.
Notices should be dealt with before notifiable work begins. Early advice allows statutory periods, neighbour communication and any Schedule of Condition to be built into the construction programme.
Frequently asked questions
Does planning permission replace a Party Wall Notice?
No. Planning and the Party Wall Act are separate processes.
Can I build up to the boundary?
Often yes, subject to the design and other legal requirements, but the correct Notice may be required.
When should Notices be served?
Before notifiable work begins and with enough time for the applicable statutory period.
Related Party Wall guides
Need advice in Kent?
Send PWS Kent your plans or describe the work and we will explain the likely Party Wall requirements.