Key Takeaways
- The building owner doing the work normally pays all reasonable fees, including the adjoining owner's surveyor.
- One agreed surveyor acting for both sides costs £900 to £2,700. Two separate surveyors costs £1,800 to £5,400.
- Costs can be shared where the work is a repair benefiting both properties, apportioned by use.
- Surveyors charge £90 to £450 per hour, and a typical award comes to around £1,000.
- The cheapest outcome by far is a neighbour who simply consents in writing, which costs nothing at all.
Almost everyone assumes the neighbour pays for their own surveyor. They usually do not. If you are the one doing the work, you are normally paying for both sides, and that is the single biggest surprise in the party wall process.
Who pays, as a general rule?
You do, if you are the building owner carrying out the work. That normally covers preparing and serving the notices, your own surveyor, the adjoining owner's surveyor, and the preparation of the award itself. The logic is that the work is for your benefit and your neighbour did not ask for any of it.
This catches people out because it removes the neighbour's incentive to be economical. An adjoining owner appointing their own surveyor is not spending their own money, which is one reason a single agreed surveyor is so much cheaper for you.
The duty to serve notice also sits with you rather than with your contractor. We identify at quotation stage which notices apply and build the statutory waiting periods into the programme, but the notice is served by you as building owner. Our Party Wall Act guide sets out the notice types and periods in full.
What do party wall surveyors cost?
The single biggest variable is whether there is one surveyor or two. One agreed surveyor acting impartially for both owners costs roughly £900 to £2,700. Two surveyors, one appointed by each side, runs £1,800 to £5,400.
| Scenario | What it covers | Typical cost |
|---|---|---|
| Neighbour consents in writing | No surveyor, no award needed | £0 |
| Single agreed surveyor | One surveyor acting impartially for both owners | £900 to £2,700 |
| Two surveyors | Each owner appoints their own | £1,800 to £5,400 |
| Preparing the award | The document itself | £500 to £1,000 |
| Typical award, all in | Common outcome for a straightforward job | about £1,000 |
| Hourly rate | Varies widely with region and complexity | £90 to £450 per hour |
Multiply by the number of adjoining owners. A mid terrace has neighbours on both sides, and a job affecting both party walls means two sets of notices and potentially two awards.
When are the costs shared?
When the work benefits both properties rather than just yours. The clearest case is repair to a shared structure that was failing anyway: a party wall in poor condition, or a shared chimney stack that needed attention regardless of your plans. There the costs are commonly apportioned according to the use each owner makes of the structure.
The surveyor decides this, and it is one of the things the award records. If you genuinely believe the work is partly remedial rather than purely for your benefit, say so early and in writing, because it is far easier to have that considered before the award is drafted than to reopen it afterwards.
The other realistic route to sharing is timing. If your neighbour has been meaning to deal with the same defect, doing the work together while the scaffold is up is cheaper for both of you than two separate jobs. That comes up often with chimney stack repairs on a terrace.
How do you keep the cost down?
- Talk to your neighbour before the notice arrives. A notice landing without warning is the most common reason someone dissents
- Ask whether they will consent in writing. Consent costs nothing and ends the process there
- If they will not consent, propose a single agreed surveyor. It is the difference between roughly £900 to £2,700 and £1,800 to £5,400
- Serve notice early. Two months for a party structure notice, one month for excavation, and rushing costs more than waiting
- Get the drawings and the engineer's design finished first, because a scheme that changes after the award may need the award revisited
- Commission a schedule of condition. It protects you against claims for damage that was already there
Note what is not on that list: doing the work without serving notice. An adjoining owner can seek an injunction, and starting notifiable work without notice is the one route that reliably ends up costing more than the surveyors ever would.
When do you need a surveyor at all?
Only when the adjoining owner dissents, or does not respond within the notice period, which counts as a deemed dissent. If they consent in writing, there is no surveyor and no award, and a great many jobs end there.
The work that commonly triggers notice on a London house is cutting a beam pocket into a party wall, removing a chimney breast from a shared stack, underpinning, and excavating within three or six metres of a neighbouring structure depending on depth. That covers most steel beam installations, chimney breast removals and extension foundations in a terrace or semi.
GS Renovation is a contractor, not a party wall surveyor. We tell you at survey stage which items are notifiable and build the waiting periods into the programme, then build to whatever the award says. We do not serve notices on your behalf and we do not act as surveyor.