Completely depends how much rust there is!
Subframes are about £300~ in parts for both (a bit cheaper if you have dry, rather than hydrolastic suspension). Fitting is a tedious job, it can be done yourself but it'll take you a while and you need to get the car solidly jacked up fairly high or you'll struggle.
Scuttle is likely to be screwed if the windows are covered in algie and that's a cut out and weld in job, something you want done decently or it will significantly reduce structural integrity.
I had rear subframe replaced, 2 new sills, a new panel behind the subframe, and some other general underside welding done, as well as a couple of other things for £500 and that was purely labour, 20+ hours, which is about right considering how long it would've taken us to do at home (no ability to weld, either).
Body panels? For example, replacing a door panel and getting it sprayed etc will cost you about... £200.
Subframes are about £300~ in parts for both (a bit cheaper if you have dry, rather than hydrolastic suspension). Fitting is a tedious job, it can be done yourself but it'll take you a while and you need to get the car solidly jacked up fairly high or you'll struggle.
Scuttle is likely to be screwed if the windows are covered in algie and that's a cut out and weld in job, something you want done decently or it will significantly reduce structural integrity.
I had rear subframe replaced, 2 new sills, a new panel behind the subframe, and some other general underside welding done, as well as a couple of other things for £500 and that was purely labour, 20+ hours, which is about right considering how long it would've taken us to do at home (no ability to weld, either).
Body panels? For example, replacing a door panel and getting it sprayed etc will cost you about... £200.