> Doing all those things at once, it's usually cheaper to knock down and start from scratch.
This has never been my experience. I've done a lot of this kind of work, in several different cities (all US though).
A full rip & replace of plumbing, electrical, and roofing should cost about 20%, and require about 10% of the time, compared to building new.
Plumbing should last 50 years (rough plumbing -- fixtures are decorative and usually change with taste before failure). Electrical should last longer, but systems older than 1970s probably need updating. Roof should last 25-30 years depending on style/material.
This has never been my experience. I've done a lot of this kind of work, in several different cities (all US though).
A full rip & replace of plumbing, electrical, and roofing should cost about 20%, and require about 10% of the time, compared to building new.
Plumbing should last 50 years (rough plumbing -- fixtures are decorative and usually change with taste before failure). Electrical should last longer, but systems older than 1970s probably need updating. Roof should last 25-30 years depending on style/material.