Party wall work: what your architect does and when you need a surveyor

The Party Wall etc. Act 1996 is the law that lets you do certain building work next to a neighbour while giving them a way to protect their property. It is separate from planning permission and building regulations. It is run by the owners of the properties involved, and where there is a disagreement it is settled by surveyors. Architects are not named in it, which is why this page starts by saying what an architect does not do.

What does the Party Wall etc. Act cover?

GOV.UK says the Act applies to England and Wales and covers three kinds of work: new building on or at the boundary of two properties, work to an existing party wall or party structure, and excavation near to and below the foundation level of neighbouring buildings (GOV.UK). The person doing the work is the building owner, and the neighbour is the adjoining owner. The Act itself defines a building owner as an owner of land who wishes to exercise rights under it (legislation.gov.uk, section 20).

Not every job triggers a notice. The booklet says some works are so minor that service of notice is generally regarded as unnecessary, and gives drilling for ordinary shelving, cutting for recessed sockets and replastering as examples. The test it points to is whether the work could affect the wall's structural strength or the neighbour's side (GOV.UK booklet). A new steel beam bearing on the wall, a rear extension on the boundary or a basement under a terrace is a different matter.

Is a party wall matter handled by an architect or a surveyor?

A surveyor. The Act gives the dispute and award functions to surveyors appointed under it, and a person has to be neutral to take that role. Your architect is working for you on the design and cannot also decide what is fair between you and your neighbour. What the architect does is make the process work, as the table below shows.

What does my architect actually do on a party wall job?

Mostly the work happens before a notice is sent. An architect who knows the Act reads the site as a set of triggers: where the design touches the boundary, where foundations might be undermined, where a beam will bear on the neighbour's wall. They can often change a detail to avoid a trigger, or at least reduce what the neighbour will be asked to accept. They will tell you which parts of the scheme need a notice, and give the surveyor the drawings and sections the award will refer to.

Programme is the other half. A party structure notice needs at least two months, and the notice ceases to have effect if the work has not begun within twelve months of service (legislation.gov.uk, section 3). So serve it neither too early nor too late. A sensible architect pencils in the date, flags it on the programme and keeps it away from the point where the builder is already waiting. If your project also needs planning or building regulations approval, the planning applications page explains how those fit alongside.

Once surveyors are appointed, the architect becomes the person who answers their questions. Expect requests for existing and proposed sections, the structural engineer's calculations and details of temporary support. Quick, precise answers shorten the dispute stage, and every week it drags on is a week your builder is not on site.

When do I need a party wall surveyor?

You need a surveyor if a notice is served and the neighbour does not consent in writing, or if the neighbour dissents. For party structure and excavation notices, the booklet says that if the neighbour does nothing within the response period, a dispute is deemed to have arisen (GOV.UK booklet). Then the Act lets the owners agree one surveyor, or each appoint their own, with the two choosing a third (legislation.gov.uk, section 10). If the neighbour refuses, or fails to appoint within ten days of a written request, the building owner may appoint one for them.

If the neighbour is happy and consents in writing, there is no dispute, and no award is made. Many owners still choose to have a surveyor record the condition of the neighbour's side first, because it protects both parties, but that is a choice. Where the owners do disagree, the surveyor makes an award that sets out what work may be done, when, and how the neighbour's property will be protected. Under the booklet, only a county court can change it, and an owner who wants to try has 14 days from the day the award is served.

Does the party wall surveyor have to be an architect?

No. Section 20 defines a surveyor as any person not being a party to the matter, appointed or selected under section 10 (legislation.gov.uk, section 20). The booklet adds that you cannot act for yourself, that the surveyor should not be someone already engaged to supervise the building work, and that they should have good knowledge of construction and of the Act's procedures. It suggests a qualified building professional, without naming a profession. RIBA can provide a list of architects who, for a fee, give party wall advice or act as surveyors.

Put those together and the practical answer is clear. Your project architect is seldom the right person to be the surveyor, because they are already engaged on the design and may be asked to supervise the build. Plenty of party wall surveyors come from building surveying rather than architecture. What matters is that they know the Act, are independent of your project and will respond quickly.

How do I check the architect on a party wall project is registered?

1. Open the Architects Register search and search for the person or practice by name.
2. Confirm the entry matches the person you have met, and that their registration is current.
3. Ask them to put their registration number in the proposal.
4. If someone calls themselves an architect and does not appear, the ARB says they are not an architect, so treat that as a reason to stop and ask questions.

What should I ask an architect about party walls before hiring?

• Which ARB registration number should I look up for you before you start?
• On past projects with a shared wall, how did you handle the notices, and did you work with the surveyors?
• Which parts of my scheme are likely to need a notice, and can the design be altered to avoid any of them?
• How much time have you allowed in the programme for notices and a possible dispute?
• Will you recommend a surveyor, and will you tell me if you have any financial connection to them?
• Do you coordinate with a structural engineer on beams that bear on the party wall?
• What happens to your fee if the surveyors' award requires a redesign?

Ask for the answers in writing and get quotes from more than one practice on the same brief. Our guide to what an architect costs sets out the common fee models. For how notices sit alongside planning and regulations on a roof project specifically, read our loft conversion guide. If you are extending, see the extensions page, and when you are ready to pick a practice you can browse by city.

What if my neighbour objects?

An objection is not a veto. The Act exists so the work can go ahead with safeguards, and it sends the disagreement to surveyors, not to a court first. The surveyors can set conditions on how and when the work is done. A courteous conversation and a copy of the drawings before the notice arrives help, and your architect can give you a plain-English summary to hand over. Anything that goes beyond the notices, such as a boundary dispute or damage claim, is a legal matter and a solicitor's job.