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My husband and I want to add an addition that consists of a bedroom, bathroom, living room, and three season room. The approximate square footage is 800. Dose anyone have an approximate amount or where we would start to get the estimate without using a contractor?

This message was edited 1 time. Last update was at 01/11/2012 05:52:52

Home additions vary in cost for a few reasons.
Adding into the existing home, ie plumbing, electricity.
Expense for bathroom fixtures or and above standard items, ie upgrade plumbing fixtures, tubs etc
standard walls height or higher, cathedral, vaulted etc.
additional cost for Hvac upgrade or new unit.
Starting cost would be around $65 per square foot in the metro area of Houston, More in the City.
Again the big question is what I want to acheive worth the dollar spent for my need and increase the value to the home.

This message was edited 1 time. Last update was at 01/11/2012 05:54:19

I would not attempt this unless you have extensive experience in the various trades involved-- electrical, carpentry, foundation/footing installation, plumbing, etc. You'll also need to get zoning permission from your municipality, which might involve submitting architectural plans, etc. If you are somewhat handy, you might be able to do portions of the work yourself, but this is a major undertaking. I would start by talking to your town building dept.

This message was edited 1 time. Last update was at 01/11/2012 05:55:52

You should really consider whether you have experience and skill of all trades--foundation, rough plumbing, rough electrical, rough carpentry, drywall, finish plumbing, finish electrical, etc.--to take on this mammoth project for a couple.
I suggest that you really consider contacting local remodeling contractors in your area to see what it would cost to have them do the addition for you.