Thanks for the points everyone, let me address some of them.
The fact that the building is listed is an issue but not too big a concern TBH. Grade II means we need approval for any external changes, but can change things inside if we want. The house was recently renovated, and both the outside and inside are in quite good condition, though there are some cosmetic changes I'd ultimately like to make on the inside. It doesn't share anything with the building next to it except a wall and the cellar, which is where we might have an issue. The house's part of the cellar is separated from a part that belongs to one of the flats only by what appears to be a wooden pallet on its side. Husband thinks that putting a more permanent barrier in might be problematic, but honestly I don't think that's pressing issue because the rest of the cellar is fine even with the temporary barrier.
It's currently a leasehold, but is being converted to a freehold. We would be buying the freehold. Zoopla estimates prices in that area anywhere from 158,000 to 210,000. I am scared of insulting the seller by going in too low, but realistically we couldn't manage more than 180,000, and that would be a stretch.
The mortgage is a concern. We should be able to come up with a deposit of 15%, though we might be able to scrape up 20%, which would get far better interest rates. But we need to talk to my in-laws to see how much they can help us out and we haven't had a chance to do that yet. We'll see them on Friday. Is it better to talk to a mortgage adviser or go straight to a bank?
@jimbocz who is John Charcol?
We're currently renting so have no chain, and the seller has already found a place to move, so hopefully will be open to offers, but again I don't want to go too low and put him off. What do you guys think? Is 165,000 a reasonable place to start if we hope to end up at 175,000 or thereabouts?