Some builders (most) use the inside dimensions of the room (24x24) but some builders want to use outside dimensions of the building which adds up considerably. Which is appropriate.
2007-12-18 02:28:50 · 2 answers · asked by keller_jack 1 in Home & Garden ➔ Decorating & Remodeling
Doesn't matter which measurement they use. You are paying for the materials to construct it. You are requesting a certain size room (interior size) and they should be charging you by the material and labor cost for building it. It sounds confusing but, I would not hire a contractor that adds the wall thickness in as far as considering it part of the square footage. He is getting paid to enclose this area.
2007-12-18 03:12:59 · answer #1 · answered by sensible_man 7 · 0⤊ 0⤋
The rule of thumb is gross outside external walls for planning authorities etc. Gross inside external walls for costings.
As it is relatively small, it would be better to cost it on an elemental basis rather than by floor area - useful if anything will need to be varied during construction (unlikley I would say in your case). The usual way is to get several firms to give you a fixed price for the finished job based on a set of drawings and outline specification and pick the best deal. Don't go into some open ended arrangement unless you know you can trust your builder.
2007-12-18 11:07:26 · answer #2 · answered by Bilbo 7 · 0⤊ 0⤋