Canterbury & Kent

Do I Need a Party Wall Agreement? When You Do — and What Happens If You Skip It

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You are planning an extension, a loft conversion or a wall between you and next door is coming into play — and someone has mentioned a party wall agreement. Do you actually need one? The short answer: if your works are ‘notifiable’ under the Party Wall etc. Act 1996, yes — and skipping it is the single most common cause of neighbour disputes we see across Canterbury and Kent.

When you need one

You must serve notice (which leads to consent or an agreement, formally an ‘award’) if you are: cutting into or building on the party wall itself — beams for a loft conversion are the classic case; building a new wall up to or astride the boundary line; or excavating within three metres of a neighbour’s structure and deeper than their foundations, which catches most single-storey extensions. Semi-detached and terraced houses are affected far more often than owners expect.

When you don’t

Purely internal works that never touch the shared wall — plastering, shelving, rewiring, new kitchens — need nothing. Nor do most detached-house projects, unless the three-metre excavation rule reaches a neighbour’s building.

What happens if you skip it

Without notice, a neighbour can seek an injunction stopping your build mid-project, and any later damage claim starts from the assumption you acted unlawfully — with no agreed schedule of condition to protect you. Retrospective fixes cost far more than the notice ever would.

What to do next

Check your plans against the Party Wall Act guide, read up on the three-metre rule, and if your works look notifiable, our party wall surveyors can serve compliant notices within days. Unsure either way? Send us your drawings or call 0204 579 8270 — we will tell you in one phone call whether the Act applies, free of charge.