A party fence wall is a wall that stands astride the boundary between land belonging to different owners and is not part of a building — the classic shared brick garden wall. The definition comes from Section 20 of the Party Wall etc. Act 1996, and it matters because work on a party fence wall is regulated by the Act even though no building is involved. Here is the party fence wall meaning explained, with the rules on ownership, repairs and notices.
The Party Wall Act definition
Section 20 of the Act defines a party fence wall as: a wall which is not part of a building, stands on the lands of different owners, and is used or constructed to be used for separating those adjoining lands. Two things must both be true: the wall sits astride the legal boundary, and it is a freestanding wall, not the wall of a house, garage or outbuilding.
Party fence wall vs fence vs boundary wall
- Party fence wall — masonry wall astride the boundary. Covered by the Act.
- Timber fence — never a party fence wall, whatever the deeds say. Fences are outside the Act entirely.
- Boundary wall — a wall wholly on one owner’s land. Not shared; the Act applies only if a neighbour excavates nearby. See our full guide to boundary wall rules.
- Party wall — separates buildings of different owners, like the wall between terraced houses.
What work on a party fence wall needs a notice?
Under Section 2 of the Act, an owner planning to underpin, thicken, raise, repair, demolish or rebuild a party fence wall must serve a party wall notice on the adjoining owner at least two months before starting. Building a brand-new wall astride the boundary needs a Section 1 line of junction notice one month ahead, and the neighbour’s written consent for the shared position.
Who owns and pays for a party fence wall?
Both owners own the part standing on their land, with mutual rights of support. Repair and maintenance costs are shared in proportion to use made of the wall and responsibility for any defect. If owners disagree, appointed surveyors determine the split in a party wall award — along with working methods, access and a schedule of condition recording the wall before work.
Common party fence wall disputes
The disputes we see most in London: one owner raising the wall for a garden room or extension without notice; demolition of an old shared wall during landscaping; damage from a neighbour’s excavation within 3 metres (see the 3 & 6 metre rule); and disagreement over whether the wall is truly astride the line. Deeds, historic photographs and a measured survey usually settle the last one — our boundary dispute service covers it.
Frequently asked questions
Is my garden wall a party fence wall?
If it is masonry and the boundary line runs through it, yes. If it stands wholly on one side, it is that owner’s boundary wall.
Can I raise a party fence wall for privacy?
Yes, under Section 2 rights — after serving notice and subject to planning height limits. See how high you can build a wall between neighbours.
My neighbour demolished our shared wall without asking. What now?
That is actionable: the Act required notice, and you may claim reinstatement or compensation. Speak to a party wall surveyor promptly and keep photographic evidence.
Ask a RICS party wall surveyor
Unsure whether the Act applies to your wall? Party Wall Surveyor London advises owners across every London borough. Call 0204 579 8270 or request a free consultation.
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