Topographical Surveys
Precise topographical and land surveys across London and the South East — mapping the exact ground, levels and features of your site for planning, development and design, by an RICS-regulated team.
What is a topographical survey?
A topographical survey (also called a topographic survey, topo survey or land survey) is a precise map of a site’s surface — recording its levels, contours, boundaries and every visible feature, from trees and walls to kerbs and manhole covers. It shows exactly how the ground sits and what is on it, tied to Ordnance Survey grid and height datum.
For anyone designing on a site — architects, engineers, developers and self-builders — it’s the essential first step: you can’t properly design drainage, levels, access or a building’s relationship to the ground without knowing what the ground actually does. Blackacre combines GNSS/GPS and robotic total-station control with laser scanning to deliver survey-grade data ready for design.
What’s included in a topographical survey
Levels & contours
Contours, spot levels and offsets across the whole site — a full picture of the terrain and its slopes.
Boundaries & features
Site boundaries and every visible feature: trees, walls, kerbs, buildings and surface structures.
Services & control
Visible services, with fixed control points tied to OS grid and altitude above mean sea level (AMSL).
Deliverables. You receive detailed 2D CAD files, a Digital Terrain Model (DTM) and contour plots, and — where useful — point clouds or surface models of external features. When building and land data are both needed, we supply a combined ‘scan + topo’ dataset.
Satellite-positioned control
Precise on-site measurement
Tied to national datum
Why a topographical survey matters
Design with confidence
Enables proper design of drainage, earthworks, retaining walls and site layout — grounded in real levels.
Integrate building & site
Helps architects, engineers and landscape designers coordinate how the structure meets the ground.
Support planning
Contour maps and levels are frequently required for planning submissions and regulatory approval.
Identifying slope, elevation changes and surface features early prevents costly surprises on site — especially on land and development projects where the ground shapes everything that follows.
Combined scan + topo, seamlessly georeferenced
Because our laser scanning is georeferenced, we can integrate building and topographical data into a single, coherent model — internal and external conditions in one dataset.
That means a measured building survey, a building height assessment and the site topo can all sit together, feeding straight into 3D models and design software. The accuracy is suitable for architectural and engineering design, enabling confident decisions from concept through to construction.
Why Blackacre
RICS-regulated
An independent, RICS-regulated practice — surveys and drawings prepared to a professional standard you can design and build from.
Scan & survey in-house
Total-station, GNSS and laser scanning under one roof, so building and land data stay perfectly aligned.
Design-ready output
CAD, DTM and terrain models delivered in the formats your design team actually uses.
Topographical surveys: your questions answered
A topographical survey is a precise map of a site’s surface — its levels, contours, boundaries and visible features (trees, walls, kerbs, services and structures) — tied to Ordnance Survey grid and height datum. It records exactly how the ground sits and what is on it, so a site can be designed accurately.
A full survey captures contours, spot levels and offsets; site boundaries; visible features and services; and fixed control points tied to OS grid and altitude above mean sea level (AMSL). You receive 2D CAD files, a Digital Terrain Model (DTM) and contour plots, and optionally point clouds or surface models.
The cost depends on the size of the site, how much detail and how large an area you need surveyed, access and terrain, and the deliverables required. Every job is quoted individually — send us the site location and what you need the survey for, and we’ll provide a tailored, no-obligation quote.
Very often, yes. Local authorities frequently require existing levels, contours and site features to be shown on planning drawings, and architects need them to design accurately. It’s usually one of the first surveys commissioned on a development.
It depends on the size and complexity of the site. Time on site can be a few hours for a small plot or several days for a large or heavily featured site; processed CAD and terrain deliverables follow once the data is worked up. We’ll confirm timings when we quote.
A topographical survey maps the land — ground levels, contours and external features. A measured building survey records the building — floor plans, elevations and sections. Because our data is georeferenced, we can deliver both and combine them into one coherent model.
Key contact
Ben Salvage MRICS C.Build E MCABE
Director | Chartered Building Surveyor
Ben leads Blackacre’s measurement and survey work. Get in touch to discuss a topographical survey across London, Surrey and Sussex.
Need a topographical survey?
Tell us the site and what the survey is for — planning, drainage, development design — and we’ll get a topographical survey booked in and turned around quickly.