Ramefor

Free published-scenario calculator

Home addition cost calculator

Select one of seven exact project sizes and Angi's Bump-Out Build or Second Story Build column. The tool returns the registered table cell unchanged—no unit multiplication, interpolation, or project adjustment.

No signupVisible source section14 exact scenarios
Published scenario

Select the exact source cell

2 fields

Only the seven sizes in Angi's table are accepted. There is no arbitrary-area input.

Second Story Build means the general article's 60–400 sq ft column, not the dedicated second-story dataset.

No interpolation, square-foot multiplication, permit or site-prep addition, room or finish adjustment, location multiplier, or dedicated second-story mixing.

Direct source lookup

How the home addition calculator works

The two selections resolve to one registered Angi value ID in the Home Addition Cost by Square Foot table. The function returns that cell's low and high values without arithmetic.

It does not multiply a per-square-foot reference, interpolate between sizes, add permits or site preparation, or adjust for foundation, rooms, finishes, location, structure, or utilities.

Review all home-addition source context

Define structure, approvals, and utilities locally

A national table cell cannot inspect foundation capacity, roof tie-in, soil, access, weather protection, electrical, plumbing, HVAC, egress, setbacks, zoning, permits, inspections, exterior matching, finishes, or concealed conditions.

Read the dedicated second-story planning guide