Land Survey Deliverables: What Files and Data You Receive
When you commission a topographical land survey, understanding what deliverables you'll receive helps you confirm the scope and ensures the data meets your project's needs.
File Formats You Get
| Format | Purpose | | --- | --- | | DWG | AutoCAD native format (2D and 3D) — standard for architects and engineers | | DXF | AutoCAD interchange format — compatible with all CAD software | | PDF | Plot-ready drawings for planning submissions and sharing | | CSV | Coordinate tables with spot level data (sometimes included) | | 3D BIM/Revit | Optional for BIM projects (RVT or IFC) |
Survey Content Included
| Element | Details | | --- | --- | | Contours | Typically 0.5m or 1m intervals for site surveys | | Spot levels | Elevation points at grid centres or key features | | Digital Terrain Model (DTM) | 3D surface model for CAD, Civil 3D, or Revit | | Building footprints | Dimensions, heights, eaves, ridges | | Boundaries and fencing | All perimeter features | | Drainage and utilities | Manholes, covers, visible service points | | Natural features | Trees, slopes, embankments, watercourses | | Roads and paths | Kerbs, access points, surfaces |
All data is referenced to Ordnance Survey National Grid (EPSG:27700) with ODN heights.
What the DWG Drawing Contains
| Layer | Content | | --- | --- | | Boundaries | Site boundary, ownership boundaries | | Buildings | Footprints with heights | | Contours | 0.5m or 1m elevation contours | | Spot levels | Elevation points throughout site | | Trees | Tree positions, canopy spread, species | | Hedges | Hedge lines and widths | | Roads | Roads, paths, driveways, kerbs | | Drainage | Manholes, gullies, pipe runs | | Services | Visible utility markers | | Structures | Walls, fences, gates, outbuildings |
Coordinate System
| Standard | Detail | | --- | --- | | Horizontal | Ordnance Survey National Grid (EPSG:27700) | | Vertical | Ordnance Datum Newlyn (ODN) | | Units | Metres |
This ensures compatibility with planning submissions and integration with OS mapping.
Level of Detail Options
| Contour Interval | When to Use | | --- | --- | | 0.25m | Detailed design, drainage, earthworks | | 0.5m | Standard site design | | 1.0m | Rural sites, outline planning | | 2.0m | Very large sites, broad planning |
Specify the required contour interval in your brief.
Digital Terrain Model (DTM)
A DTM represents the bare ground surface as a 3D mesh or grid. It is used for:
| Application | Benefit | | --- | --- | | Cut and fill calculation | Volume of earth to be moved | | Drainage design | Surface flow paths and levels | | Visualisation | Terrain rendering in 3D software | | Earthworks planning | Construction sequence |
The DTM is provided in DWG format and can be imported into Civil 3D, Revit, or other CAD/BIM software.
2025 Land Survey Costs
| Site Size | Typical Price (ex VAT) | | --- | --- | | Up to 0.25 acres | £595–£600 | | 0.25–0.5 acres | £795 | | 0.5–1 acre | £995–£1,200 | | 1–3 acres | £1,500+ | | 3+ acres | POA | | Day rate (small survey) | £300–£500 |
Factors affecting cost: site complexity, terrain, access difficulty, contour interval required, turnaround time.
Frequently Asked Questions
Q: Can I get the survey in GIS format?
Some surveyors can provide GIS formats (Shapefile, GeoJSON). Confirm this when commissioning. Standard delivery is DWG and PDF.
Q: What is a DTM and how is it different from a point cloud?
A DTM (Digital Terrain Model) is a processed surface — contours and terrain grid. A point cloud is raw scan data (millions of points). The DTM is derived from the point cloud and is the standard deliverable.
Q: What if I need additional detail (e.g., underground drainage)?
Invisible drainage requires a separate drainage survey (often CCTV drain survey). Visible drainage features are included in the standard topo survey. Specify if you need a combined utility survey.
Q: Can the surveyor include underground utilities?
Underground utilities require a separate PAS 128 utility survey. The topographical survey captures visible features only.
Q: What standard does the survey follow?
Most UK land surveys follow RICS "Specification for Surveys of Land, Buildings and Utility Services at 1:500 and larger." Confirm the standard with your surveyor.
Q: Can I get the survey in my local coordinate system?
Standard delivery is OS National Grid. Local grid systems are possible — specify this in the brief and confirm the transformation parameters.