We deliver accurate measured building surveys throughout the southwest using the latest in real-time survey technology. Producing all floorplans, building sections and elevations on-site we don’t leave the room before our measurements are within the industry defined tolerances for architectural surveys ensuring that you get the level of detail you require for your project.

We have the means to survey any building and due to the rural area we operate in we are adept at measuring older traditional properties such as the Devon longhouse, listed buildings and traditional agricultural barns, none of which have a square corner between them.

Our building Surveys are used for the following purposes.

  • Property alterations & extensions
  • Planning applications
  • Fire safety floorplans
  • Land Registry & conveyancing
  • Historic & listed building records
  • As-built drawings



  • About us

    With over 25 years experience in the property industry Mark Trewin formed Datumline Surveys with the sole intention of providing a very personal service to both professional and domestic customers alike. Specialising in individual properties and smaller sites Mark is able to work directly with his clients to provide a very efficient reliable service. These services include