Land Survey Hounslow: What You Need
A topographical land survey in Hounslow (TW3, TW4, TW5) is a detailed Ordnance Survey-referenced map of your site's natural and man-made features — used for planning, design, and construction projects across West London.
What Is Included in a Topographical Land Survey
| Category | Details Captured | | --- | --- | | Boundaries and control | Legal and visible boundaries; survey control tied to OS grid and datum | | Buildings and structures | Footprints, thresholds and eaves and ridge levels, walls, fences, gates, steps, patios, hardstanding | | Topography | Spot heights, contour lines (commonly 0.5m or 1m intervals), slopes, changes of level, kerbs, gullies | | Natural features | Trees (position, trunk diameter, canopy spread, height), hedges, watercourses, vegetation boundaries | | Utilities and drainage | Manhole covers, gully tops, visible service markers, drain covers, access points; PAS 128 utility trace available as add-on | | Street furniture and access | Lamp posts, signs, railings, bollards, road edges, footpaths, access points, levels to adjacent highway | | Data and accuracy | 3D coordinates, vertical and horizontal control, survey date, methodology, accuracy band per RICS standard |
Surveys are produced to RICS Measured Surveys of Land, Buildings and Utilities (3rd ed.) standards.
2025 Costs in Hounslow (TW3–TW5)
| Site Type | Cost (ex VAT) | Notes | | --- | --- | --- | | Small residential plot (e.g., rear garden or small extension site) | £450–£850 | Often 1 day on site; fast turnaround | | Medium residential or small commercial | £850–£1,500 | More boundaries, trees, drainage, tighter contours | | Large, complex, commercial, or infrastructure | £1,500–£5,000+ | Challenging terrain, dense vegetation, detailed utility overlays | | Day rates (if quoted separately) | £300–£1,000 on-site data collection; £300–£600/day for drafting | — | | Typical fixed quote | ~£500 for a typical topo measured and drawings in 8–10 hours | Minor surveys ~£300; laser scanning add-on ~£150/day |
Prices are exclusive of VAT (20%) and may include travel within Greater London. Quotes in Hounslow TW3–TW5 are commonly fixed-price once site extents are known.
Standard Deliverables
| Deliverable | Format | | --- | --- | | CAD drawings | .DWG or .DXF with 3D data (surfaces, contours, spot levels, COGO points) | | PDF plans | For planning submissions and design coordination | | 3D surface model | LandXML compatible | | Contour lines | 0.5m or 1m intervals | | Spot height data | Included in CAD | | Point cloud | E57, RCP, or PTS formats (if laser scanning used) | | Optional: PAS 128 utility trace | GPR and EML mapping of underground services |
When You Need a Land Survey in Hounslow
| Project | Land Survey Required? | | --- | --- | | Planning permission | Yes — Hounslow Council requires accurate topo for most developments | | New development | Yes — site layout and drainage design | | House extension | Required for sloping sites or complex boundaries | | Drainage design | Yes — levels and drainage features | | Tree surveys (BS5837) | Yes — tree positions and RPAs for planning | | Garden or landscape design | Yes — accurate ground levels and features |
Timeline
| Stage | Duration | | --- | --- | | Site visit | 1–3 working days for most standard sites | | Drawing delivery | 3–5 working days | | Total | 1–2 weeks from instruction |
Frequently Asked Questions
Q: What accuracy is achieved on a topographical survey in Hounslow?
±10–20mm for ground features. Surveys are tied to Ordnance Survey National Grid with GPS control.
Q: Can the survey include underground drainage?
Yes — PAS 128 utility trace (GPR and EML) available as an add-on for mapping underground services and drainage.
Q: What scale are drawings produced at?
1:200 or 1:500 for planning submissions. Confirm with your architect or Hounslow Council planning department.
Q: Do I need both a topographical and measured building survey?
A topographical survey covers external land and ground levels. A measured building survey covers internal building dimensions. You may need both for an extension project.
Q: Is VAT included in the quoted price?
No — add 20% VAT to all day rates and fixed quotes.