"Jim B" wrote in message
...

If I engage contractors or builder to rebuilding and enlarge
a house, what will be the percentage for labor and building
material?

The reason why I ask the question, is how much can I save
if I do some of the manageable work myself, like installing
windows, doors, gutters, sidings, internal drywalls, piping
and etc.



There is no way to give an accurate answer but I will share the following.

On a recent renovation about 1/3 of the total cost was for materials
exclusive of the plumbing electrical and HVAC materials. Those were
included in the total bid but were not itemized.Those subs bid the job labor
and materials with only a total for their part. My best guess is 45-50% of
my total project was materials. The itemized materials included lumber,
doors, windows, drywall and roofing.

Of the things you listed the drywall and exterior siding are the more labor
intensive. Unless you have done it before and are quick and good at it let a
pro do the drywall. You may or may not be legally allowed in your area to do
your own plumbing. Here you can if you live in the home, provide drawings
and have it inspected.


Colbyt