What Is a Topographical Survey?
A topographical survey (topo, land, or contour survey) is a precise measurement of all natural and man-made features on a site, including their elevations. It produces CAD drawings, contour maps, and 3D models showing buildings, boundaries, trees, drainage, ground heights, and contours — all georeferenced to OSGB36 grid.
What It Includes
| Feature Type | What's Captured | | --- | --- | | Man-made features | Buildings, fences, walls, service covers, drainage, walkways, boundaries | | Natural features | Trees (location and spread), streams, slopes, ground heights, contours | | Ground data | Spot levels, contours at 0.5m or 1m intervals | | Utilities | Visible above-ground markers; GPR/underground survey optional | | Accuracy | Within 2mm using GPS, total stations, laser scanners |
2025 Costs in London
| Site Size/Type | Cost Range (ex VAT) | | --- | --- | | Small domestic plot | £350–£399 | | Typical residential/commercial | £2,000–£6,500 | | Large/complex brownfield | £8,000–£10,000+ |
Pricing factors: site size, number of features ("difficulty factor"), accessibility, and required detail level. An open field is cheaper than a wooded site with outbuildings.
Standard Deliverables
- CAD drawings (DWG, DXF formats) with clear layers
- PDF versions for easy viewing and planning submissions
- Contour maps and spot height levels
- 3D models (RVT/IFC for BIM work) — optional
- Coordinate reports and breaklines
- Methodology statement and QA notes
Coverage Across All32 London Boroughs
Yes — we cover all 32 London boroughs plus the City of London and Home Counties:
Barnet, Camden, Croydon, Ealing, Enfield, Greenwich, Hackney, Hammersmith& Fulham, Haringey, Harrow, Havering, Hillingdon, Hounslow, Islington, Kensington & Chelsea, Kingston upon Thames, Lambeth, Lewisham, Merton, Newham, Redbridge, Richmond upon Thames, Southwark, Sutton, Tower Hamlets, Waltham Forest, Wandsworth, Westminster, Barking & Dagenham, Bexley, Brent, Bromley.
Turnaround Time
| Stage | Timeline | | --- | --- | | Booking/lead-in | 1–2 weeks (5–10 working days) | | Fieldwork | 1 day for ~5,000m²; longer for complex urban sites | | Drafting/QA | 1–2 working days after fieldwork | | Total | 2–3 weeks from instruction | | Expedited | 5–7 working days (available on request) |
RICS Standards
Topographical surveys follow RICS "Measured Surveys of Land, Buildings and Utilities, 3rd Edition" guidance covering survey accuracy, control networks, coordinate grids, and datum. For boundary disputes or legal documentation, use an RICS-accredited surveyor.
When You Need One
- Planning applications and design projects
- Land development, construction, and setting-out
- Defining property boundaries for legal and real estate purposes
- Drainage design and SuDS compliance
- Flood risk assessments
- Risk management (drainage issues, boundary disputes, hazards)
Frequently Asked Questions
Q: What accuracy can I expect from a topo survey?
Modern equipment (GPS, total stations, laser scanners) achieves accuracy within 2mm. RICS standards require ±50mm for detail points at 95% confidence.
Q: What file formats will I receive?
AutoCAD DWG and PDF as standard. Optional: DXF, Revit RVT, IFC for BIM workflows. Confirm formats when requesting a quote.
Q: Do I need a topo survey for planning permission?
Yes — most planning applications require a topographical survey showing ground levels, boundaries, trees, and drainage. Check with your local planning authority for specific requirements.
Q: What is the difference between a topo survey and a boundary survey?
A topographical survey maps all features on a site. A boundary survey specifically determines the legal boundaries of a property. A topo survey is typically sufficient for planning and design; a boundary survey is needed for legal disputes or conveyancing.