When You Need a Topographical Survey in Wembley
A topographical survey is essential for:
- Planning permission: most LPAs expect accurate site plans for anything beyond minor works
- New builds and replacement dwellings: verifies design fits within boundaries and levels
- Significant extensions and outbuildings: shows impact on access, drainage, massing
- Sloping or irregular sites: levels affect drainage, access, retaining walls
- Conservation areas: near heritage assets and sensitive neighbours
- Trees present: BS5837 arboricultural constraints require accurate topographical data
- Flood risk and SuDS: drainage design requires accurate levels
- Brownfield sites: likely underground utilities and services
Wembley's dense urban development and mix of commercial and residential projects makes accurate topographical data essential for any design that interacts with ground levels, drainage, or boundaries.
Costs in Wembley/London (2025)
| Site Size | Typical Use | Price Range (ex VAT) | | --- | --- | --- | | Up to 0.25 acres | Residential plot, small commercial | £450–£795 | | 0.25–0.5 acres | Medium residential | £795–£995 | | 0.5–1 acre | Commercial or medium development | £995–£1,200 | | 1–3 acres | Larger development | £1,500+ | | Complex or urban sites | Wembley dense development | £1,500–£4,500+ |
Prices include VAT (20%) and typically cover travel within London.
Standard Deliverables
You'll receive:
| Deliverable | Format/Standard | | --- | --- | | CAD drawings | DWG + DXF + PDF formats | | Contour lines | Typically 0.5m–1m interval for planning | | Spot levels | Height grids and coordinate data | | Site boundaries | Walls, fences, vegetation | | Building footprints | With eaves, ridge, and threshold levels | | Drainage and utilities | Covers, visible utilities | | OS National Grid coordinates | Georeferenced to OSGB36 | | Optional | 3D point clouds or BIM-ready RVT/IFC |
Technical specs: Scale 1:200 (small sites) or 1:500 (larger sites). Surveyor-grade total station and GNSS to OS National Grid. Full site extent from boundary to boundary, including all features.
Turnaround Time
| Phase | Duration | | --- | --- | | Booking and lead-in | 5–10 working days (1–2 weeks) | | Fieldwork (5,000m² site) | 1 day | | Drafting and QA | 1–2 working days | | Total | 2–3 weeks from instruction |
Fast-track options available for urgent tender deadlines. Expedited service available on request.
Wembley HA0 Coverage
We provide topographical surveys throughout Wembley and surrounding HA0 postcode areas — including Wembley, Wembley Park, Tokyngton, Preston, North Wembley, South Kenton, and all surrounding HA, NW, and WD postcode areas. Wembley HA0 is well-covered by London-based surveyors with quick engagement and competitive pricing.
Frequently Asked Questions
Q: When do I need a topographical survey in Wembley?
You need a topographical survey for most planning applications in Wembley and Brent, especially new builds, major extensions, replacement dwellings, and sites with trees or complex topography. Brent planning authority typically requires accurate site plans showing levels, boundaries, and tree positions.
Q: What contour interval do I need?
1m contours are standard for planning applications. Drainage and earthworks design typically require 0.5m contours. Confirm with your design team.
Q: What accuracy can I expect?
RICS standards require ±50mm accuracy for detail points. All surveys are georeferenced to OS National Grid with OD heights.
Q: How long does a topographical survey take in Wembley?
Booking lead-in is typically 1–2 weeks. Fieldwork is 1 day for small to medium sites. Drawing production takes 1–2 working days. Total: 2–3 weeks from instruction. Fast-track options available for urgent deadlines.
Q: Do I need a topographical survey for an extension in Wembley?
If your extension involves significant earthworks, drainage changes, or affects boundaries, a topographical survey is typically required by Brent planning. For minor single-storey extensions, a measured building survey may suffice — confirm with the planning department.