A party wall surveyor protects your property and your legal position whenever building work happens on or near a shared boundary. The framework is set by the Party Wall etc. Act 1996, which gives owners the right to carry out certain works while protecting their neighbours from damage. Whether you are planning the work yourself or a notice has just landed on your doormat, this guide explains how the process runs, what it involves, how long it takes, and who pays.
What is a party wall?
A party wall is a wall, structure or boundary shared by two adjoining properties. The most common example is the wall dividing two terraced or semi-detached homes. A garden wall built astride the boundary line is also a party wall, sometimes called a party fence wall.
The Act recognises more than just vertical walls between houses. A “party structure” includes floors and ceilings that separate flats, so the rules can apply between maisonettes and apartments, not only between houses. A wall is treated as a party wall where it stands on land belonging to two owners, or where one owner has built against it and it now serves both buildings.
If you are unsure whether a particular wall, floor or boundary is covered, that is precisely the kind of question a party wall surveyor settles before any notice is served.
What is the Party Wall etc. Act 1996, and what does it cover?
The Party Wall etc. Act 1996 is the law that governs building work affecting a shared wall, a boundary, or the ground next to a neighbouring building. Its purpose is to let owners carry out legitimate works while giving neighbours a clear, enforceable framework of protection.
The Act covers three broad situations. Section 1 deals with building a new wall on or up to the boundary line between two properties. Section 2 sets out the rights to carry out works to an existing party structure, such as cutting in to take the weight of a new beam or rebuilding a shared wall. Section 6 covers excavation close to a neighbour’s foundations.
Where a neighbour wants the full protections offered under the Act, section 10 provides the dispute-resolution machinery: the appointment of surveyors and the making of a Party Wall Award. Following the Act is not optional for qualifying works — it is a legal requirement.
Do I need a party wall surveyor?
You need to consider the Act, and possibly a surveyor, whenever your project involves work to a shared wall, building up to or astride the boundary, or excavating within 3 metres of a neighbour’s building or structure (and 6 metres in certain circumstances). Typical examples include loft conversions, rear and side extensions, removing a chimney breast, underpinning, and basement work.
You do not always need a surveyor. If you serve the correct notice and your neighbour gives written consent, the matter can proceed without one, although a Schedule of Condition is still sensible. A surveyor becomes necessary when your neighbour dissents, or is treated as having dissented, and a Party Wall Award is required.
A good first step is simply to ask. Websters advise whether the Act applies to your particular project before any notice is drafted — and sometimes it does not, which saves time and cost. You can read more on our party wall surveyors page.
Which building works require a party wall notice?
Many common home improvements trigger the Act. Cutting into a party wall to support a loft conversion, building an extension up to or astride the boundary, removing a chimney breast on a shared wall, and inserting beams or padstones all fall under section 2.
Excavation is a frequent trigger under section 6. Notice is generally required where you dig within three metres of a neighbour’s building and to a lower depth than their foundations, or within six metres where your excavation would cut a line drawn downwards at forty-five degrees from the base of their foundations. Basements, underpinning and deep foundations regularly meet these tests.
Building a new wall on or up to the boundary line falls under section 1. Routine internal works that do not touch a shared structure, such as plastering or fitting shelves, do not require notice. If you are uncertain, it is far cheaper to check before works begin than to unpick a dispute afterwards.
How much notice do I need to give my neighbour?
The notice period depends on the type of work. For works to a party structure under section 2, you must serve a party structure notice at least two months before work is due to start. For a line of junction notice under section 1, or a notice of adjacent excavation under section 6, the period is at least one month.
Notices have a shelf life. A party structure notice lapses if the work does not begin within twelve months of service and does not then proceed diligently. That means serving notice far too early can be as unhelpful as leaving it too late.
A valid notice must identify the building owner, describe the proposed works clearly, and give the relevant date. Defective notices are a common cause of delay and dispute, which is why it pays to have them prepared properly. Serving the correct notice in good time keeps a project on schedule and on the right side of the law.
What happens after a party wall notice is served?
Once a notice is served, your neighbour — the adjoining owner — has fourteen days to respond. They can consent in writing, in which case the works can proceed without an Award. They can dissent and appoint their own surveyor. Or they can dissent and agree with you to use a single impartial surveyor, known as the Agreed Surveyor.
If the adjoining owner does nothing within fourteen days, the Act treats the matter as a dispute under section 5. The building owner must then serve a further request, and if there is still no response, a surveyor can be appointed on the adjoining owner’s behalf so the process can continue.
A dissent is not hostility, and it does not block reasonable works. It simply moves the matter onto the formal track, where surveyors record the position and produce an Award. Most matters settle calmly once both sides understand that the framework protects them equally.
What is a Schedule of Condition, and why does it matter?
A Schedule of Condition is a detailed record of the adjoining property’s state before any works begin. It typically combines written descriptions with dated photographs of the areas most likely to be affected, such as walls, ceilings and external finishes near the works.
Its value lies in what it prevents. If a crack or other defect appears once building work is under way, the Schedule provides an agreed baseline against which the surveyors can judge whether the work actually caused it. Without that record, disputes about pre-existing damage become difficult and often unfair to one side.
For the adjoining owner, the Schedule is the single most important protection the process offers. For the building owner, it is equally valuable, because it guards against unfounded claims for damage that was already there. A thorough Schedule, prepared before a single tool is lifted, is in everyone’s interest and forms part of the Party Wall Award.
What is a Party Wall Award?
A Party Wall Award is the legal document, prepared by the surveyor or surveyors under section 10, that governs how the works are carried out. It records what work is permitted, how and when it will be done, the hours of working, arrangements for access, and the Schedule of Condition.
The Award is binding on both owners and their successors. It sets out how any damage will be put right and how the surveyors’ fees are to be met. Once served, either owner has fourteen days to appeal to the county court if they believe the Award is wrong, after which it stands.
An Award is not a formality to be rushed. A well-drafted one anticipates the practical realities of the build and removes the friction points before they arise, which is why both sides benefit from surveyors who know the work. Once the Award is agreed, the building owner is free to begin.
Do I need a surveyor if my neighbour consents?
If your neighbour consents to the notice in writing, you are not required to obtain a Party Wall Award, and the works can proceed. Even so, arranging a Schedule of Condition remains a wise precaution for both parties.
Consent removes the formal dispute machinery, but it does not remove the risk of damage or disagreement once works are under way. A Schedule of Condition recorded at the consent stage gives both owners the same protection an Award would have provided on that point. It is inexpensive relative to the cost of arguing about damage later.
Consent should always be genuine and informed. An adjoining owner who signs away their position without understanding it may regret it if problems arise. For that reason, neighbours are often encouraged to take their own advice before consenting — and a building owner who handles the process openly is far more likely to keep relations cordial throughout the build.
Who pays the party wall surveyor’s fees?
As a general rule, the building owner — the person carrying out the works — pays the reasonable surveyors’ costs, including the adjoining owner’s surveyor where one is appointed. This reflects a simple principle in the Act: the party who benefits from the works bears the cost of the protection the law requires.
The practical effect for an adjoining owner is reassuring. Where Websters act for you as the adjoining owner’s surveyor, our reasonable fees are normally met by your neighbour, so protecting your home typically costs you nothing.
Fees are not unlimited. The Act refers to reasonable costs, and surveyors are expected to act proportionately rather than run up unnecessary expense. Where a single Agreed Surveyor acts for both sides, costs are usually lower still, because only one professional is involved. A clear fee position, set out at the start, is one of the things that keeps the process calm rather than contentious.
What if my neighbour ignores or refuses the notice?
Ignoring a notice does not stop the works. If the adjoining owner fails to respond within fourteen days, the Act treats the matter as a dispute, and a surveyor can ultimately be appointed to act on their behalf so the process can move forward.
A refusal — a dissent — likewise does not give a neighbour a veto over reasonable works. It moves the matter onto the formal track, where surveyors record the position and produce an Award that protects both parties. The building owner’s right to carry out legitimate works remains intact.
What an adjoining owner cannot do is delay matters indefinitely or impose unreasonable conditions. The surveyors’ role is to be impartial and to apply the Act, not to favour the party who happens to pay. Equally, the building owner cannot simply start work while a dispute is unresolved. Works can only begin once the Award is agreed, which is why engaging early avoids costly hold-ups.
What happens if building work damages my property?
If damage occurs during the works, the Schedule of Condition becomes the reference point. The surveyors compare the property’s recorded state before the works with its condition afterwards and determine whether the building work caused the damage.
Where it did, the Award governs how the matter is resolved. The building owner is generally responsible for making good the damage or, where the adjoining owner prefers, for paying compensation in lieu. The surveyors decide what is fair, drawing on the evidence rather than on either owner’s assertion.
This is the heart of why the process exists. A homeowner who has had a proper Schedule of Condition prepared is in a strong position if something goes wrong, because the evidence is already in place. A building owner who has followed the Act properly is equally protected against exaggerated or unfounded claims. Handled correctly, the framework turns what could be a bitter neighbour dispute into a matter the surveyors resolve on the facts.
How long does the party wall process take?
Timescales vary with the route taken. Preparing and serving notices usually takes a couple of weeks. If the adjoining owner consents, matters can conclude quickly thereafter. If they dissent, the surveyors must prepare a Schedule of Condition and agree an Award, which typically adds several weeks.
The statutory notice periods run alongside this — two months for a party structure notice, one month for a line of junction or adjacent excavation notice — and works cannot start until both the notice period has passed and any Award is in place.
The clear lesson is to start early. Party wall matters are best dealt with well before contractors are booked, so that the legal process and the practical preparation for the build run in parallel rather than one holding up the other. Leaving it to the last minute is the single most common cause of avoidable delay, and it is entirely within the building owner’s control to prevent.
Can one surveyor act for both neighbours?
Yes. Where both owners agree, a single impartial surveyor — the Agreed Surveyor — can act for both sides under section 10. This is a common and sensible arrangement, particularly for straightforward works, because it is usually quicker and less expensive than each owner appointing their own surveyor.
The Agreed Surveyor does not act for the building owner or for the adjoining owner. They act for the Act, applying it impartially and producing an Award that protects both parties equally. The fact that the building owner usually pays the fees does not change that duty of independence.
The alternative is the two-surveyor route, where each owner appoints their own and the two work together, with a third surveyor available to resolve any deadlock. That route can suit more complex or contentious matters. Websters regularly act in all three roles — building owner’s surveyor, adjoining owner’s surveyor, and Agreed Surveyor — and always impartially, as the Act requires.
How Websters can help
A party wall matter should be one of the calmer parts of a building project, not one of the most stressful. Websters are a firm of Chartered Surveyors regulated by RICS, and our party wall team are members of the Faculty of Party Wall Surveyors, with experience across London and the surrounding counties.
We act for building owners, adjoining owners, and as a single Agreed Surveyor for both sides — advising whether the Act applies, preparing and serving notices, recording the Schedule of Condition, and agreeing the Award. Whichever role we take, we explain each step in plain English so you always know where you stand.
If you have received a notice, or you are planning works and need to serve one, visit our party wall surveyors page to see how we work and to request a quote. No question is too small, and a short conversation at the outset often saves a great deal of difficulty later.