The surveys are non-invasive. So, given that the walls will not be opened up, the surveyor may not be able to confirm the extent of a particular defect. This may occur in particular with floor damp as fitted floor coverings would prevent the surveyor from being able to inspect the area further. On these occasions, we may refer to further inspections you may need to undertake to fully confirm the extent of the damage and the cost of repair. The surveys are non-invasive. So, given that the walls will not be opened up, the surveyor may not be able to confirm the extent of a particular defect. This may occur in particular with floor damp as fitted floor coverings would prevent the surveyor from being able to inspect the area further. On these occasions, we may refer to further inspections you may need to undertake to fully confirm the extent of the damage and the cost of repair.