Free home addition cost calculator: sq ft, bump-out through kitchen expansion type bands, finish level, site complexity, regional index, permits and design fees, contingency, low–mid–high USD planning range, animated stacked and bar charts, scenario rows—not a GC quote.
Planning notice: A home addition cost calculator cannot see your foundation report, zoning setbacks, or whether the panel needs a service upgrade. This tool outputs an illustrative USD band from conditioned square feet, addition type, finish level, site complexity, and region—not an architect’s estimate, not a GC quote, and not permit-ready engineering.
Summary: Enter new conditioned square feet, an addition archetype (bump-out through kitchen-heavy wing), finish level, site / structural complexity, regional index, permits & design fees you want modeled as a lump sum, and a contingency percent. You get low–mid–high totals, a budget share strip, dollar bars, and scenario rows—same spirit as the bathroom remodel planning band.
Home addition cost calculator (planning band + charts)
Whether you are sketching a rear wing, a second-story pop, or a primary suite slab-on-grade, start with transparent square-foot math—then bring three local design-build or GC proposals onto the same scope sheet.
