Party Wall Surveyor in London

Fixed-fee party wall surveyors for Building Owners and Adjoining Owners across South and West London

A party wall surveyor is a specialist surveyor appointed under the Party Wall etc. Act 1996 to serve notices on neighbouring owners, record the condition of their property before work starts, settle disputes, and produce a party wall award that binds both sides. Grey & Associates has handled over 1,000 London party wall projects since 2008, on a fixed fee agreed before we start. What the appointment actually requires — and why a party wall surveyor is not an advocate for the owner who appointed them — is set out under the role of a party wall surveyor.

Key takeaway

A party wall surveyor administers the Party Wall etc. Act 1996 — notices, a Schedule of Condition, and a binding award — and where a London case becomes a dispute, the Building Owner pays the reasonable fees of both sides' surveyors. A one-neighbour case with Grey & Associates is £1,135 all-in plus VAT, fixed before work begins.

We act for both sides of the wall. If you are extending, converting a loft or digging a basement, we serve the notices and steer the case to a conclusion so your programme isn't held up. If a notice has landed on your doormat, we represent your interests as the Adjoining Owner and make sure your property is properly recorded before anyone starts.

What does a party wall surveyor actually do?

The appointment is a statutory one, not a commercial one. That single fact shapes everything: the surveyor's first duty is to see that the Act is complied with, which is what allows an agreed surveyor to act impartially for two owners who want different things. Four pieces of work sit under that duty.

1. Serving valid notices

Notices have to be correct — the right recipient, the right description of the works, the right section of the Act, and the right amount of notice. A defective notice is worse than none at all, because it can be challenged later. We prepare and serve them and deal with the correspondence that follows.

2. Schedule of Condition

A dated, photographic record of a neighbouring property's condition before work begins. It is the evidence that decides whether a crack found afterwards was caused by your work or was already there. Without one, that argument is unwinnable for either side.

3. Resolving the dispute

Where owners don't agree — or where a neighbour simply doesn't reply — the Act refers the dispute to surveyors. That may be one agreed surveyor acting for both sides, or one surveyor appointed by each owner, with a third surveyor available if the two can't settle.

4. Making the award

The award is the binding document that sets out what may be built, how, when, what protection the neighbour gets, and who pays what. It also fixes who is responsible for making good any damage. We draft, negotiate and serve it — and inspect at completion.

Each of those four steps has its own page, because each one raises different questions: party wall notices covers serving and receiving notice and what the 14-day window does; Schedule of Condition explains the pre-works record that decides damage disputes; party wall awards sets out what the binding document covers and who it binds; and party wall surveyor fees publishes the whole fee schedule, including what a two-neighbour case costs. The surveyor stage itself is covered in appointing a party wall surveyor — the agreed surveyor, one surveyor each, and what happens when a neighbour will not engage — and where owners are agreeing terms rather than disputing them, party wall agreements sets out what a written agreement has to contain.

If you want the detail of the legal framework, our guide to the Party Wall Act explained walks through it, and the full text of the Act is on this site. The Royal Institution of Chartered Surveyors (RICS) also publishes consumer guidance on appointing a surveyor.

Do you need a party wall surveyor?

You need one when your work falls into one of the three situations the Act covers. In London's terraces and semi-detached streets, most domestic projects hit at least one of them.

  • Building a new wall on the line of junction (s.1) — a new wall on or astride the boundary between two properties. The Act gives you the right to build it, but notice must be served at least one month before work begins.
  • Work to an existing party structure (s.2) — cutting into a shared wall, inserting a steel beam into a party wall, raising a party wall to support a loft conversion, or underpinning it. Notice here is two months, the longest in the Act.
  • Excavation near a neighbour (s.6) — digging within three metres of a neighbouring structure and deeper than its foundations, or within six metres where the dig would cut a 45-degree line drawn down from the bottom of those foundations. Basements, new foundations and drainage runs usually fall here. Notice is one month.

Once notice is served, the neighbour has 14 days to respond in writing. Consent can be given, or a counter notice served within one month. If they do not reply at all, section 5 of the Act deems a dispute to have arisen — which sounds alarming and is in fact routine. It simply moves the case onto the surveyor stage.

Our guide to the different types of party wall explains how to work out which you have, and the party wall notice timeline sets out the dates step by step.

How much does a party wall surveyor cost in London?

Our fees are fixed and published. You get a single figure before we start, and it doesn't move if the case runs longer than expected — which is the point of a fixed fee rather than an hourly rate.

Our fixed fees

  • Serving notice(s) — £165 + VAT per adjoining property
  • Schedule of Condition — £620 + VAT each
  • Award, acting for the Building Owner — £350 + VAT per adjoining property
  • Award, acting for the Adjoining Owner (as agreed surveyor) — no additional charge

All prices exclude VAT, charged at 20%. A separate award is required for each neighbour where notice has to be served.

All-in totals for one neighbour

If the case becomes a dispute (notices + one Schedule of Condition + award):

£1,135 + VAT

All prices are plus VAT at 20%.

Basement and underpinning works are priced differently. The fixed fees above cover the standard cases — serving notices, Schedules of Condition and awards for extensions, loft conversions and similar projects. Basement excavation and underpinning involve deeper excavation, more engineering input and far more extensive schedules, so they sit outside these figures. We review your plans and the proposed works first, then present a formal written quote before anything is agreed and before any notice is served. Nothing in this section is an offer or a substitute for that quote.

Those fees are all-inclusive and cover as many site visits as the case needs, all correspondence with you, with your neighbours, and with any other surveyor involved. There is no meter running on phone calls or emails.

One exception is worth knowing about, because it surprises people. Time spent dealing with poor or defective workmanship, negligence, or a failure to comply with an award or consent is charged separately at £185 per hour plus VAT. The first two hours of time spent on normal and unavoidable damage to a neighbouring property are not charged for. In other words, the standard risks are inside the fee; the avoidable ones are not.

If you are comparing quotes, read how party wall surveyor fees should really work and our guide to fixed price party wall surveyors — the difference between a fixed fee and a low headline rate is where most of the argument about cost actually happens.

Who pays for a party wall surveyor?

Where a dispute has arisen, the Building Owner — the person carrying out the work — is responsible for all surveyors' fees, including those of the surveyor and any checking engineer appointed by the Adjoining Owner. This is the position the Act sets out in section 11, and it is not a matter of negotiation in the ordinary case.

It follows that an Adjoining Owner who has just received a notice is not paying for their own representation. If your neighbour is extending into the wall you share, the cost of your surveyor sits with them. Many people don't know this and assume they must either accept the works or fund a fight.

The alternative is the Agreed Surveyor route, where both owners use the same surveyor. That is usually the fastest way through, and it is the arrangement most London cases should be aiming for. The statutory appointment is what allows one surveyor to act for two owners with different interests while owing their duty to the Act rather than to either client.

Party wall surveyors in South West London

South West London is our home ground — the office is on Windsor Avenue in SW19, and it is where the bulk of our caseload sits. The property stock here shapes the work: dense Victorian and Edwardian terraces where two houses share a single brick wall, and where almost any rear extension, side return or loft conversion touches it.

Wandsworth and Merton

Wandsworth (SW11 Battersea, SW12 Balham, SW15 Putney, SW17 Tooting, SW18 Wandsworth) and Merton (SW19 Wimbledon, SW20 Raynes Park, CR4 Mitcham, SM4 Morden) generate more party wall work than anywhere else we cover. Victorian terraces converted into flats mean multiple adjoining owners in a single building, so one project can need several notices and several awards. In Wimbledon, Raynes Park and the surrounding 1930s streets the builds are often lighter — loft conversions and rear extensions — but the shared wall is still there, and so is the notice.

Lambeth and Southwark

Lambeth (SW2 Brixton, SW4 Clapham, SW8 Nine Elms, SW9 Stockwell, SW16 Streatham, SE11) and Southwark (SE1, SE5 Camberwell, SE15 Peckham, SE16, SE22 East Dulwich) have some of the highest concentrations of flat conversions in London. Side-return extensions and rear additions to Victorian terraces are routine, and they almost always involve a section 3 party structure notice. Excavation cases under section 6 are common too, particularly around basement and lower-ground-floor work.

Richmond and Kingston upon Thames

Richmond upon Thames (TW9 Richmond, TW1 Twickenham, SW13 Barnes) and Kingston upon Thames (KT1 and KT2 Kingston, KT3 New Malden, KT5 Surbiton, KT6) bring a different set of considerations. Conservation areas and riverside frontages mean the works themselves attract more scrutiny, and the buildings are older and more varied — Georgian and Victorian villas alongside inter-war semis. Schedule of Condition surveys matter more here, because aged plaster and original detailing are exactly what damage disputes turn on.

Party wall surveyors in South East London

South East London has the largest volume of Victorian terrace housing in the city, and the most consistent demand for party wall notices to go with it.

Lewisham and Greenwich

Lewisham (SE3 Blackheath, SE6 Catford, SE12 Lee, SE13 Lewisham, SE23 Forest Hill) and Greenwich (SE7 Charlton, SE9 Eltham, SE10 Greenwich, SE18 Woolwich) are dominated by loft conversions and rear extensions. Lewisham's terraces and the bigger Victorian houses around Blackheath and Forest Hill lend themselves to loft and lower-ground work; Greenwich mixes Georgian frontage around the town centre with Victorian streets behind it.

Croydon, Bromley and Sutton

Further out, the stock changes. Croydon (CR0, CR2 Sanderstead, CR5 Coulsdon, CR7) and Sutton (SM1, SM2, SM3 Cheam, SM5 Carshalton) are largely inter-war semis and terraces, where a loft conversion or a rear extension is the typical project. Bromley (BR1, BR2, BR3 Beckenham, BR4 West Wickham) has more detached and larger semi-detached housing, so the shared-wall question comes up less often — but where a boundary wall or a line-of-junction wall is involved, section 1 applies just the same.

Party wall surveyors in West London

West London is where the cases get more complex — bigger houses, tighter sites, and a higher proportion of basement work that reaches a long way down.

Hammersmith and Fulham

A compact borough (W6 Hammersmith, W12 Shepherd's Bush, SW6 Fulham) of Victorian terraces, where side-return extensions are close to a standard project. Because the properties are narrow and deep, works are physically close to the neighbours on both sides — which is precisely the situation the Act exists to manage. Hammersmith is where this practice started, and it is covered in detail on our Hammersmith party wall surveyor page.

Kensington and Chelsea

In the Royal Borough (SW3 Chelsea, SW5 Earl's Court, SW7 South Kensington, SW10, W8 Kensington, W10 Ladbroke Grove, W11 Notting Hill) two factors dominate. First, listed buildings and conservation areas, where the surveyor needs to be comfortable working alongside the architects and consultants who deal with consent. Second, basement excavation, which brings in section 6 and makes the Schedule of Condition a serious document rather than a formality. Early, well-drafted notices matter more here, because the programme risk from a late challenge is highest. See our pages for Kensington, Chelsea and Knightsbridge, where mansion blocks and separating floors rather than boundary walls set the agenda.

Ealing, Hounslow, Brent and Westminster

Ealing (W3 Acton, W5 Ealing, W7 Hanwell, W13 West Ealing, UB1 Southall) and Hounslow (TW3 Hounslow, TW4, TW5, TW7 Isleworth, TW8 Brentford, W4 Chiswick) cover Victorian and Edwardian terraces alongside inter-war semis. Brent (NW2 Cricklewood, NW6 Kilburn, NW10 Willesden, HA0 and HA9 Wembley) adds a high proportion of sub-divided houses — more adjoining owners, more notices, more awards. In Westminster (W1, W2, W9 Maida Vale, NW8 St John's Wood, SW1) mansion blocks and listed buildings create the same pattern as Kensington and Chelsea: multi-owner buildings and careful basement work. Ealing and Chiswick have their own pages: Ealing for the sub-divided terraces of Acton and Ealing Broadway and the inter-war semis further west, and Chiswick for the larger semis and detached houses of Bedford Park and Grove Park.

Harrow and Hillingdon

At the western edge, Harrow (HA1, HA2, HA3) and Hillingdon (UB3 Hayes, UB4, UB8 Uxbridge, UB10 Hillingdon) are predominantly 1930s semi-detached housing, where a single neighbour and a single notice is the usual shape of the case.

Basement and underpinning schemes — our specialism

Basement excavation is the most demanding work we do, and it has been part of our caseload since the practice opened in Hammersmith in 2008. It is also the work where a party wall surveyor makes the most difference, because the risk is not in the paperwork — it is in what the excavation does to the neighbouring foundations over the months that follow.

  • Section 6 governs it. Notice at least one month before excavation begins where the dig is within three metres of a neighbouring structure and deeper than its foundations, or within six metres where it would cut a 45-degree line from the bottom of those foundations. Most basements that gain headroom meet that test without difficulty.
  • Liability does not depend on fault. Section 7 requires the building owner to compensate the neighbour for loss or damage caused by work executed under the Act, so damage from the excavation is compensable whether or not anyone was negligent. That is what turns the Schedule of Condition from a formality into the most important document in the case.
  • The engineering is part of the notice. Secant and contiguous piling, temporary works, underpinning of the neighbouring footings and any monitoring regime are notifiable operations, and the award has to describe them well enough for the contractor to build to and the neighbour to understand.
  • Water is the recurring risk. Tanking, dewatering and the neighbour's own cellar or sump all need recording before work starts. Ingress and movement are the two claims that follow a neighbouring dig most often, and both are decided by the pre-works record.

Basement schemes are priced separately from the fixed fees below, because the scheduling and engineering input is far greater than on a loft conversion. We read the structural drawings and method statement before quoting. Full detail, including how we run a basement case from notice to completion, is on our basement and underpinning party wall surveyors page.

Party wall surveyors across London — where we work

We cover Greater London within the M25, with the caseload concentrated in the south and west of the city. Each area has its own property stock and its own recurring problems, and each has a dedicated page setting out what that means for notices, schedules and awards.

  • Wandsworth — our highest-volume borough: Battersea, Balham, Putney, Tooting, Earlsfield and Southfields, where converted houses mean multiple adjoining owners against a single party wall.
  • Wimbledon — SW19 and SW20, where our office is based: from Village and Parkside basement schemes to standard side-return and loft work in the terraces around the Broadway.
  • South West London — Wandsworth, Merton, Lambeth, Richmond upon Thames and Kingston upon Thames, including riverside and conservation-area work in Barnes, Richmond and Surbiton.
  • South East London — Southwark, Lewisham, Greenwich, Croydon, Bromley and Sutton, from the flat conversions of Peckham and Camberwell to the inter-war semis of Croydon and Sutton.
  • North London — Camden, Islington, Haringey, Barnet and Enfield, from basement digs under the Georgian terraces of Islington and Camden to loft conversions and extensions on the inter-war semis of Barnet and Enfield.
  • East London — Hackney, Tower Hamlets, Newham, Waltham Forest, Redbridge, Barking & Dagenham and Havering, where heavily sub-divided Victorian terraces, warehouse and flat conversions, and regeneration sites where new build abuts existing housing all produce notices.
  • West London — Hammersmith & Fulham, Kensington & Chelsea, Westminster, Ealing, Hounslow and Brent, where basements, mansion blocks and sub-divided houses dominate the caseload.

Our five region pages are the hubs for the areas beneath them — each one lists every local page in its part of London — so between this list and those pages you have the complete map of where we act.

In West London, where basements and multi-owner buildings concentrate, each area has its own page:

  • Hammersmith — W6, W12 and W14, where the practice started in 2008: side-return extensions needing a notice on each side, and basement schemes against shallow Victorian footings.
  • Kensington — W8 and W11, Notting Hill and Holland Park: two-storey basements, listed buildings and leasehold blocks where the adjoining owner is often an estate.
  • Chelsea — SW3 and SW10: narrow plots with no side return, riverside ground water, mews properties and estate freeholds.
  • Knightsbridge — SW1X and Hans Town: separating floors, structural frames and lateral conversions in mansion blocks, plus deep basements under the houses.
  • Chiswick — W4, Bedford Park and Grove Park: semi-detached and detached stock, where boundary walls and line-of-junction notices matter more than the classic two-notice case.
  • Ealing — W5, W13, W7 and W3: dense sub-divided terraces in Acton and Ealing Broadway alongside inter-war semis in Hanwell and Northfields.
  • Basement and underpinning schemes — our specialism, across London: section 6 notices, temporary works, monitoring, and Schedules of Condition written to withstand a structural damage claim.

Not sure which applies to you? If your property is anywhere within the M25, call us and we will tell you plainly whether the Party Wall etc. Act 1996 is engaged — and if it isn't, we will say so.

What happens if your neighbour won't agree?

Dissension is normal and it does not stop the work. Where the owners disagree, or where the neighbour doesn't reply within 14 days, the Act refers the matter to surveyors. One agreed surveyor can act for both owners; otherwise each owner appoints their own, and if those two cannot agree they select a third surveyor to decide.

The surveyors produce an award — a binding document that covers what work may be carried out, when, how, what conditions apply, the state and condition of the neighbouring property, who makes good any damage, and who pays which costs. Once made and served, it binds the owners and anyone deriving title from them. A building owner who deviates from the award is in breach.

An award, or the refusal to make one, can be challenged by appeal to the county court within 14 days of service. That is a genuine right, but it is also a reason to get the notice and the Schedule of Condition right at the start rather than litigate at the end. The Act sets no deadline for making the award, but it must be served as soon as it is made.

Our guide to what to do when a neighbour ignores a party wall notice is the practical companion to this section, and boundary disputes with neighbours covers the cases that sit next to the Act — fence ownership, overhanging branches and high hedges, which are not party wall matters at all but often arrive in the same phone call.

How we work

Grey & Associates have worked exclusively on the Party Wall etc. Act 1996 since 2008, for building owners, adjoining owners and architects, across Greater London within the M25. That concentration is deliberate: the Act's notices, awards and timetables reward repetition, and most of the value we add is in spotting the problem before it becomes a dispute rather than in arguing afterwards.

We work alongside design teams on the projects that generate most party wall cases — loft conversions, rear and side-return extensions, temporary works, and the structural alterations that go with them, including the foundation design questions that decide whether new foundations are needed. Architects and project managers can find the detail on our page for architects, and homeowners a broader view in our guide to home extension projects.

Where a case turns on the condition of a wall, we also investigate. Persistent damp, cracking or moisture in a shared wall is a frequent reason a party wall survey is commissioned — telling condensation, rising and penetrating damp apart explains which signs point to a cause a survey can actually pick up. The build-up of the wall itself changes what the notice and the award have to cover, which our guide to cavity wall and solid wall construction sets out. For repair work, lead flashing and soaker repairs to party walls are a common trigger.

What you get from us in practice: a fixed fee agreed up front, as many site visits as the case needs, and one point of contact who tells you plainly where the case stands. If you're choosing between firms, our guide to choosing a party wall surveyor in London sets out the questions worth asking.

Party wall surveyor London — frequently asked questions

How much does a party wall surveyor cost in London?

Grey & Associates charge fixed fees: £165 per adjoining property to serve notice, £620 per Schedule of Condition, and £350 per adjoining property for an award acting for the Building Owner. A one-neighbour dispute — notices, one Schedule of Condition and the award — is £1,135 all-in. All figures exclude VAT. Basement and underpinning works are priced differently, and a formal quote is presented after we have reviewed the plans and the proposed works. The fee is agreed before work starts and does not change if the case takes longer.

Do I need a party wall agreement to build an extension?

You need to serve notice under the Party Wall etc. Act 1996 if your extension involves work to a shared wall, building a new wall on the line of junction, or excavating within three metres of a neighbouring structure and deeper than its foundations. A rear or side-return extension in a London terrace will usually trigger one of these. Notice must be served at least two months before work starts for work to an existing party structure.

How long does a party wall notice take?

Notice periods are set by the Act: one month for a new wall at the line of junction under section 1, two months for work to an existing party structure under section 3, and one month for excavation under section 6. Your neighbour then has 14 days to respond in writing. If they do not, a dispute is deemed to have arisen and surveyors are appointed.

What happens if my neighbour ignores a party wall notice?

If your neighbour does not respond in writing within 14 days, a dispute is deemed to have arisen under the Party Wall etc. Act 1996. Nothing has gone wrong and you are not blocked — you simply move to the surveyor stage, either with a single agreed surveyor acting for both sides or with one surveyor appointed by each owner. See our guide to what to do when a neighbour ignores a party wall notice.

Who pays for a party wall surveyor?

In a dispute, the Building Owner carrying out the work is responsible for the reasonable fees of both sides' surveyors, including any surveyor and checking engineer appointed by the Adjoining Owner. This is a statutory position, not a commercial one. The Adjoining Owner is not paying for their own representation in the normal case.

What is the difference between a party wall and a boundary wall?

A party wall is a wall that sits on the boundary and is shared by two properties, or stands wholly on one owner's land but is used by both. A boundary wall or party fence wall is a wall separating adjoining land that does not form part of a building. The distinction decides which section of the Party Wall etc. Act 1996 applies, and whether a notice is needed at all.

Is a party wall surveyor the same as a building surveyor?

No. A building surveyor inspects and reports on property condition for a client. A party wall surveyor holds a statutory appointment under the Party Wall etc. Act 1996, with a duty to ensure the Act is complied with. When acting as the agreed surveyor for both owners, that appointment allows them to act impartially rather than as an advocate for one side.

Can I deal with the party wall paperwork myself?

There is no legal requirement to appoint a surveyor if your neighbour consents in writing, but the notice must still be valid under the Act — a defective notice or a missing one exposes the work to an injunction. If your neighbour dissents or does not reply within 14 days, the Act brings surveyors in whether or not you wanted them.

How long does the whole party wall process take?

For a consented case, allow one to two months from serving notice to starting work: one month for an excavation notice or two months for a party structure notice, plus the 14-day response window. Where surveyors are appointed and an award is needed, the Act sets no deadline for making the award, but it must be served on the parties as soon as it is made.

Which London boroughs do you cover?

Grey & Associates cover Greater London within the M25, with a strong concentration in South and West London. That includes Wandsworth, Merton, Lambeth, Southwark, Lewisham, Greenwich, Croydon, Bromley, Sutton, Richmond upon Thames, Kingston upon Thames, Hammersmith and Fulham, Kensington and Chelsea, Ealing, Hounslow, Brent, Harrow, Hillingdon and Westminster.

Talk to a London party wall surveyor

Whether you are about to start work and need notices served properly, or you have received a notice and want someone in your corner, the first conversation is free and there is no obligation attached to it.

  • A fixed fee quoted for your specific project, before any work starts.
  • Plain advice on whether the Party Wall etc. Act 1996 applies to what you're planning.
  • Representation whether you are the Building Owner or the Adjoining Owner.
  • Cover across South and West London, and Greater London within the M25.

The Party Wall etc. Act 1996 is neighbourly legislation — its whole purpose is to let building work proceed without damaging the relationship next door. That is the standard we hold our cases to. Call 020 8150 3762 or email info@greyandassociates.co.uk.

Have a specific question? Our frequently asked questions page covers the ones we're asked most, the information guide goes deeper, and key terms and definitions explains the language. You can also read more about Grey & Associates. Where a project involves excavation below ground, our basement and underpinning page covers the section 6 position.

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