lumao

http://www.simplyadditions.com/index.php?/Package-Links/Remodeling-Calculator-Home-Equity-Calculator-Home-Improvement-Calculator-Remodeling-Calculators.html

http://homeimprovement.lovetoknow.com/Home_Addition_Calculator
any close to the reality?
http://www.americanbasementsolutions.com/free-estimate.html

estimates for basement
http://www.costhelper.com/cost/home-garden/sunroom.html

http://www.byoh.com/gettingstarted.htm

house addition calculators

http://cranky.eons.com/Cranky/search/search.jsp?queryTerms=Home+Addition+Calculator
and more fun sites http://www.coolhouseplans.com/house_plan_additions/index.html