Free second story addition cost calculator: new second-floor sq ft, basic mid or upscale finish, structural complexity, stair allowance, MEP extension tier, regional index, contingency, low–mid–high USD with charts—planning only, not a bid.
Planning notice: This second story addition cost calculator models a vertical pop-up / full second level planning band in USD from new heated square feet, finish class, structural complexity, stair integration, MEP rough extension tier, region, and contingency. It is not architectural design, not zoning or setback analysis, and not a GC contract price.
Summary: Enter new second-story heated sq ft (not whole-house size), finish level, structural / plan complexity, stair rebuild or stack relocation allowance, MEP extension intensity, regional index, and contingency. You get low–mid–high totals, a stacked strip, bar charts, and scenario rows to stress-test scope before you request design-build proposals.
Second story addition cost calculator (vertical pop-up band)
Targets second story addition cost, adding a floor over a garage, and pop-top remodel budget searches—then separates shell + stairs + MEP intuition from finish allowances your designer still has to pin.
