Age and type of house
Why does the rear addition of a Victorian terrace need its own lines in the survey?
Because it is often a lower, later, or more lightly built piece than the main house: a flat or shallow roof, a parapet gutter, a solid wall, and a kitchen that hides the damp. A comment on the front slate slope does not describe it. The surveyor should say what they could see of that roof and that wall.
Last reviewed 24 October 2026. Written for buyers in England and Wales unless this answer says otherwise. No named surveyor has signed this page. It is general guidance, not a report on your house, and not legal advice.
What is the fuller explanation?
Rear additions collect leaks at the abutment with the main house and at valley or parapet gutters you cannot see from the street. Inside, units hide the wall. The survey does not pull kitchens out. NI behind units is a limit. Do not average it into “the terrace is fine”.
If you plan to open the rear into a side return, that is future building work: regulations, possibly party wall, possibly planning. The survey of the house as it stands is not that design. There is no price here for a side return. Do not subtract one from the asking price because the back addition is old.
What should you ask your surveyor?
- Did you see the rear roof and the gutter at the abutment?
- Were kitchen units limiting the damp check?
- Is the rear wall solid brick?
What are the typical next steps?
- Read the rear roof as its own element when you get quotes.
- Do not retile the front because the back addition leaks.
- Tell the solicitor if you intend structural work later. Do not pretend the survey approved it.
Costs vary with the building and with who you instruct. Where this page does not cite a published figure, ask the surveyor, a relevant specialist, or your solicitor for a written quote. Do not treat a forum average as the price.
Also asked about this
Is a two-storey back addition the same as a single-storey one?
No. Height changes the roof, the drainage and what the surveyor can see. The report should not use one sentence for both.
Does a Victorian house always have a cellar under the rear?
No. Ask what is under this one. Do not invent a cellar from the date.