HI Cam
We are building Surveyors,the Building society or Bank building surveyor may pick it up but its not a deal breaker. There are many things to take in to consideration. U values or heat loss is are a consideration.
1. Is it Damp?
2. It will be cold and therefore black mould might be an issue.
3. Under the tile hanging is there a waterproof membrane.
4. Can you dryline with insulated plasterboard on the inside or is it already in place.
5. Are the window reveals and cills going to be sufficiently weather to keep out the damp.
6. If they have used this construction as a cost saver, what is the flat roof like, insulated or not?
7. Your loan size to value of the property will also have a baring.
Give us a call if you have questions. You should have a survey of your own to be satisfied.
8. How old is the Extension.
9. Are there drawings available, was permission sought, was building control involved.
Mal Thomas Castlemore Surveyors 01202486666