An accurate measured survey of your building before design starts

For homeowners, landlords and developers who need accurate existing floor plans, elevations or sections. Describe the building and compare quotes from professionals who carry out measured surveys.

A measured building survey records a building exactly as it stands: room sizes, wall thicknesses, door and window positions, ceiling and floor levels, roof shapes and external elevations. Surveyors use laser measuring tools, total stations or 3D laser scanners, then produce scaled drawings, usually as CAD files and sometimes as a 3D model or point cloud. Designers rely on the survey for everything that follows, so a mistake here carries through to planning drawings, structural design and builders’ quotes. A good surveyor agrees the scope and level of detail up front, measures every space you need, and checks that the plans, sections and elevations tie together.

How a professional can help

• Existing floor plans: They measure each floor, recording walls, openings, stairs, chimney breasts, fixed fittings and ceiling heights, so the drawn plans match the real building.
• Elevations and roof shapes: They record each external face of the building, including window and door positions, ridge and eaves heights, and features such as bays, dormers and chimneys.
• Sections and levels: They draw sections through the building showing floor-to-ceiling heights, floor levels, stairs and roof structure, which matters for lofts, basements and split-level homes.
• 3D scanning and models: For complex, historic or large buildings, they can laser scan the property to produce a point cloud or 3D model that designers can work from directly.
• Floor area measurements: They can calculate floor areas for lease plans, valuations or marketing, measured to the standard you, your solicitor or your agent ask for.

Is this right for you?

• You’re about to start designing an extension, loft conversion or refurbishment and have no accurate drawings.
• Your property is old, irregular or listed, and a quick tape-measure survey won’t capture it properly.
• You need floor plans and areas for a lease, sale or letting.
• You’re a developer or landlord planning work across several floors or buildings.

How the project usually runs

• Agree the scope: You and the surveyor agree which floors, elevations and sections are needed, the level of detail and accuracy, and the file formats you want.
• Site visit and measuring: The surveyor measures inside and out with laser tools, a total station or a 3D scanner, and takes reference photos as they go.
• Drafting the drawings: Measurements are processed into scaled plans, elevations and sections in CAD, with levels, heights and notes on anything that couldn’t be reached.
• Checking and issue: The drawings are checked for consistency and issued to you and your designer, usually as CAD and PDF files, with any 3D data supplied separately.

What affects the cost

• The size of the building and the number of floors, rooms and elevations to be recorded.
• Whether you need sections, roof plans, ceiling plans or a 3D model as well as floor plans.
• How irregular or historic the building is, since uneven walls and floors take longer to capture.
• Access: occupied rooms, locked areas, roof spaces and tall elevations can add time or need extra equipment.
• The level of accuracy and detail you ask for, and the file formats required.

Surveys, applications and boundaries

• Councils judge proposed plans against the existing drawings, so the existing drawings need to be accurate.
• A measured survey records the building, not the legal boundary; in England and Wales, title plans normally show general boundaries only.
• For listed buildings, a detailed survey often supports the heritage statement and any listed building consent application.
• Where a project depends on land levels, trees or boundary features, a topographical survey is usually carried out alongside.

Questions people ask

Is a measured survey the same as a building or homebuyer survey?

No. A measured survey records sizes and layouts to produce accurate drawings. A building or homebuyer survey looks at condition and defects, and a structural survey looks at how the structure is performing. Depending on your project, you may need more than one.

Can my designer measure the property instead?

For a small house with simple rooms, many designers measure as part of their service. For larger, older or more complex buildings, or where precision really matters, a dedicated survey with specialist equipment is usually more reliable. Ask each professional how the existing building will be recorded and how accurate it will be.

What files will I receive?

Most surveyors supply CAD files, often in DWG format, which designers can work on directly, plus PDFs for viewing and printing. With laser scanning, you can also ask for the point cloud or a 3D model in the format your designer uses. Agree the formats before the survey is booked.

Do I need to be there during the survey?

Someone needs to give access to every room, the loft and any outbuildings included in the survey. If the property is let, arrange access with the tenants well in advance. Clearing clutter from walls and corners helps the surveyor work accurately.

How accurate is a measured survey?

Accuracy depends on the equipment, the method and the level of detail agreed. Laser scanning captures very fine detail, while a traditional survey is precise enough for most home projects. Agree the accuracy you need in writing, especially for tight sites, shared walls or where new work must fit existing openings.

Can the survey include the garden and site levels?

Some surveyors can add external levels, boundaries and trees, though strictly that’s a topographical survey. If your project depends on site levels, drainage falls or tree positions, ask for both together so all the information fits on one set of drawings.

Available across the UK

Professionals cover the whole of the UK: England, Scotland, Wales and Northern Ireland. Planning and Building Regulations differ between the four nations, and your professional will work to the rules that apply where your property is.

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