Cost guide
How much does a party wall surveyor cost?
Published UK ranges by project type, for one surveyor and for two.
A single party wall surveyor typically costs £900–£2,700 depending on the project, according to HomeOwners Alliance and Checkatrade, who both quote closely aligned figures: around £900–£1,200 for a loft conversion, £1,200–£1,500 for an extension, and £1,800–£2,700 for a basement. If each side appoints their own surveyor, expect roughly double.
Last updated 17 August 2026
| Range | ||
|---|---|---|
| Loft conversion, single surveyor | £900–£1,200 | Total project |
| Extension, single surveyor | £1,200–£1,500 | Total project |
| Basement, single surveyor | £1,800–£2,700 | Total project |
| Hourly rate | £90–£450 | Rate |
Sources: HomeOwners Alliance (2026 guide), Checkatrade (updated June 2026)
Key points
- Whether one surveyor acts for both parties (an "agreed surveyor") or each side appoints their own — the latter roughly doubles the cost.
- The complexity and scale of the project itself, since a basement carries more risk to a shared structure than a loft conversion.
These are general published ranges, not a quote. Get an estimate based on your own project.
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Other cost guides
More published cost ranges
How much does a loft conversion cost?
Published industry ranges by conversion type, so you can budget sensibly before getting a quote.
How much does a house extension cost?
The published UK per-m² rate for a single-storey extension, and what actually moves it.
How much does a two storey extension cost?
Published per-m² rates by build quality, and what a typical two-storey extension runs in total.
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