Measured Survey for Planning Permission: UK Guide
For most planning applications involving changes to an existing building in the UK, you need a professional measured survey. Planning authorities require accurate existing condition drawings — not rough sketches or old conveyancing plans.
When You Need a Measured Survey
| Scenario | Required? | | --- | --- | | Extensions (single or two-storey) | Yes | | Loft conversions | Yes | | New builds | Yes | | Change of use | Yes | | Significant roof alterations | Yes | | Permitted development (Lawful Development Certificate) | Recommended | | Minor works | Often still required |
What LPAs Require
| Drawing | Scale | Details | | --- | --- | --- | | Existing floor plans | 1:50 or 1:100 | Room sizes, walls, doors, windows | | Existing elevations | 1:50 or 1:100 | All four faces with architectural detail | | Sections | 1:50 | Roof heights, internal level changes | | Site or block plan | 1:500 or 1:200 | OS base, boundary, access |
When You Definitely Need a Survey
- Sloping or irregular sites where levels affect access or drainage
- Conservation areas or heritage asset proximity
- Sites with trees (BS5837 arboricultural constraints)
- Brownfield land with potential underground utilities
- Complex plots with tight boundaries or easements
2025 UK Costs
| Property Type | Cost (ex VAT) | | --- | --- | | Simple residential | £400–£800 | | Typical extension | £400–£800 | | Modest commercial | ~£2,000 | | UK average measured building survey | £1,400 | | 2D drawings | From £375 per drawing | | 3D BIM model | From £550 |
Note: Survey represents less than 1–2% of total project budget. London prices higher due to access complexity.
Frequently Asked Questions
Q: Can I submit old drawings from conveyancing?
No — conveyancing drawings are not accurate enough for planning validation.
Q: What accuracy do surveyors achieve?
Professional surveys: ±4mm (laser scanning) vs ±20–50mm for tape measures.
Q: Do London LPAs have stricter requirements?
Yes — Westminster, Camden, and Kensington & Chelsea have strict validation. Inaccurate drawings risk refusal.
Q: How do I commission a measured survey for planning permission?
The standard approach is to brief the surveyor with the property address, the floors in scope, the planning application type (householder, full, or listed building consent), the LPA's validation requirements (most LPAs publish a local validation list), the deliverable format (DWG + PDF, with the scale and presentation matching the LPA's published style), and the target submission date. icelabz responds with a fixed-fee quote within 24 hours and the on-site visit is typically scheduled within five to ten working days of instruction. Where the property is in a conservation area or adjacent to a heritage asset, a higher accuracy band (typically ±4 mm at 95% confidence, equivalent to a RICS Band B survey) is usually appropriate, and the surveyor will confirm this at the quoting stage. All icelabz measured surveys issued for planning submissions are aligned with the RICS Measured Surveys of Land, Buildings and Utilities standard (3rd edition) and are issued with a signed accuracy statement for LPA validation.