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)
These are general UK ranges. We build across the North West, including Darwen, Blackburn and the wider Lancashire and Greater Manchester area - site access, local trade rates and travel distance can move your actual price within (or occasionally outside) the range above.
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.
Start Your ProjectLooking at how much does a party wall surveyor cost?? See how we approach it →
Common questions
How much does a party wall surveyor cost? FAQs
Is this a fixed quote for my party wall surveyor?
No. The figures above are published UK industry ranges from HomeOwners Alliance and Checkatrade, not a quote for your project. An accurate price depends on a site survey and your specific requirements - get in touch for an estimate based on your own project.
What actually drives the price up or down?
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.
What's a typical loft conversion, single surveyor in total project terms?
Loft conversion, single surveyor typically runs £900-£1,200 (total project), based on the sources cited above.
Other cost guides
More published cost ranges
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.
What's the cost per square metre for an extension?
The per-m² method explained, and the published UK rate.
Ready to make more of your home?
Tell us what you're thinking and let's see what's possible.
Start Your ProjectMore Space, Built to Last.