- Just start the work with a new architect and ask them if anything existing needs to change?

This is how I break it down:MaterialsLabor (days, workers)Permit fee, filing fee, architect feeMy margin (city is typically more because more traffic, tickets and more time consuming in general) each state/city is different because operating cost, insurance, licensing  is different. 

If you're in the process of design an local architect should be able to give a better estimate than a online fourm. 

This is for @Valerie Hiscoe, For this mock up I used Virtual Architect Instant Makeover.

I use Chief Architect's home designer suite.

You are not dealing with demo, plans, architects, permits, surveys, constructions, loans, etc.

With a designer on your team, you no longer need to worry about building relationships with suppliers for materials or finding an architect.

I found this architectural design competition website a while back:www.arcbazar.com/If you are remodeling or building a house, you can put up a few hundred dollars in prize money for an international design contest, and architects around the world submit design proposals.

Start with a sign or banner outside the house, usually listing all the participants and if we have an architect and engineer involved, we put their names up also.

-Architect of Anarchy-man behind the curtain