Basement Development, Secondary Suite, Garden Suites, Additions COST-PLUS 25%* SAVE$$$ average cost to do a basements runs from $50,000..garden suites from $250,000 You can save with a cost-plus contract and accomplished worry free with a 40 year experienced professional. Visit us to learn more and contact: www.piscescarpentry.com *25% is a average fee, percentages may vary +/- per project