Canterbury & Kent

What Is a Party Wall?

What a party wall agreement is, when you need one and what happens without it — a plain-English guide from Canterbury and Kent party wall surveyors.

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A party wall is a wall that stands astride the boundary between two properties and is shared by the owners on either side of it. The everyday example is the wall between two terraced or semi-detached houses, but the legal definition is wider than most people expect: it also covers a wall that sits wholly on one owner’s land but is built up against by the neighbour, a garden wall built astride the boundary, and the floors and ceilings between flats. Structures that separate buildings are covered too, which is why the rules bite on loft conversions and basement digs as often as they do on extensions.

The legal definition under the Party Wall etc. Act 1996

The Party Wall etc. Act 1996 is the statute that governs all of this in England and Wales. It does three things. It gives a building owner rights to carry out certain works that would otherwise be a trespass or a nuisance. It gives the adjoining owner the right to be told in advance, to have the existing condition of their property recorded, and to be put back right if the work causes damage. And it provides a surveyor-led dispute procedure so that neither side has to go to court to resolve a disagreement.

The Act recognises two distinct things. A party wall proper is one that is shared, either because it stands on the boundary or because both owners have built into it. A party fence wall is a free-standing garden or boundary wall that straddles the line; a fence panel or a wall standing entirely on one side is not covered. A party structure is the wider category that takes in floors, ceilings and partitions separating parts of a building in different ownership.

What “party wall agreement” actually means

People usually say “party wall agreement” when they mean one of two things. Either the neighbour has signed a consent letter, in which case no surveyor is needed and the work can proceed, or the neighbour has dissented and a party wall award has been drawn up by surveyors. The award is the formal document; it is what most solicitors will ask to see when the property is later sold. Both routes begin with a notice.

Work that requires a party wall notice

• Section 1 — building a new wall on or at the line of junction where nothing currently stands.
• Section 2 — work directly to an existing party wall: cutting in for beams, inserting a damp-proof course, underpinning, raising it for a loft conversion, or taking it down and rebuilding.
• Section 6 — excavating within three metres of a neighbouring structure and going deeper than its foundations, or within six metres where the excavation falls below a line drawn at 45 degrees from the base of their foundations.

Notice periods differ: two months for section 2 work, one month for section 1 and section 6. The notice must be served before work starts, and it lapses if work has not begun within twelve months.

Your neighbour started work without a party wall agreement

This is the single most common reason people ring us. If notifiable work has already begun without a notice, the building owner has no statutory protection and the adjoining owner can in principle seek an injunction to stop the work. In practice injunctions are expensive and the courts expect you to have tried to resolve matters first. The usual and far cheaper route is to write to the building owner setting out that the work is notifiable, ask them to serve a notice retrospectively and appoint a surveyor, and get a schedule of condition recorded on your side straight away so there is an agreed record of what the property looked like before the work went further. If damage has already occurred, photograph and date everything.

What a party wall surveyor does

The surveyor’s duty under the Act is to the Act itself, not to whoever appointed them. Both owners can appoint a single “agreed surveyor”, which is quicker and cheaper, or each can appoint their own. The surveyor records the condition of the adjoining property, settles what work is permitted and how it must be carried out, sets out working hours and access, and produces the award. Ordinarily the building owner — the one doing the work — pays the reasonable surveying costs on both sides.

Party wall advice in Canterbury and Kent

We act as agreed surveyor and as an appointed surveyor for either side across Canterbury, Whitstable, Herne Bay, Faversham, Ashford, Maidstone and the Thanet towns. Canterbury’s older terraces and the city-centre conservation areas throw up more than their share of shared chimney stacks, mixed-era brickwork and shallow Victorian foundations, all of which change how a notice should be framed and how carefully the schedule of condition needs to be written.

Frequently asked questions

Is a party wall the same as a boundary?

No. The boundary is a legal line; a party wall is a physical structure. A party wall usually sits on the boundary, but a wall can stand entirely within one owner’s land and still be a party wall if the neighbour has built into it.

Do I need a party wall agreement for a loft conversion?

Almost always yes, because steel beams are normally cut into the shared wall, which is section 2 work and needs two months’ notice.

What happens if my neighbour ignores the notice?

Silence is treated as dissent after fourteen days. A dispute is deemed to have arisen and surveyors are appointed; the work is not blocked, it simply proceeds under an award.

How long is a party wall award valid?

The award itself does not expire, but the notice underpinning it lapses if the work has not started within twelve months of service.