Nearly all householder projects will require a measured building survey in order to demonstrate to the local authority of your intent to extend or convert the existing property as it stands.
We can provide this service or introduce you to a surveyor that can.
Usually, the survey will take 1-2 hours to complete with full access to the property. Then 3-4 days to complete the drawings. These drawings can then be used for the concept sketch stages and detailed planning application drawings.