Siding Cost Calculator - Cost per Square Foot

Typical U.S. range	$5–$25 per sq ft installed
Measured by	Wall area, not floor area
Cost split	About 45% labor, 55% materials
Often extra	Removal, sheathing repair and trim

What is Siding Cost Calculator?

Siding is priced by wall area, which is not the same as floor area and is the most common mistake homeowners make when estimating. Measure the height and width of each wall and add the gables, then subtract large openings such as garage doors. The material sets most of the cost: vinyl is the least expensive common option, engineered wood and fiber cement sit in the middle, and metal and natural wood cost more. Removal of the old siding, repairs to the sheathing or house wrap underneath, and new trim are usually separate items. This calculator uses your wall area and a price you control.

Common uses for Siding Cost Calculator

Budget a full siding replacement before getting quotes
Compare vinyl, fiber cement, metal and wood siding costs
Work out how much wall area your house actually has
See whether removing the old siding fits your budget

Wall area, not floor area

A 1,500 square foot single-storey home might have 1,400 to 1,800 square feet of exterior wall, and a two-storey house of the same floor area has roughly double. Measure each elevation and add the gables rather than guessing from the listing. Getting this number wrong scales the entire estimate, so it is worth ten minutes with a tape measure.

What hides behind the siding

Re-siding is the best opportunity you will get to inspect sheathing, house wrap, flashing and window openings. Rot around windows and at the base of walls is common and easy to miss from outside. Budget a modest allowance for repairs, and ask your contractor to photograph anything they uncover before they cover it up again. That record is useful if a problem appears later.

Why the cheapest material is not always cheapest

Vinyl has the lowest sticker price, but it cannot be repainted if it fades, and a cracked panel may need a matching replacement that is no longer made. Fiber cement and metal cost more up front and need less attention over decades. Wood sits between: repairable and paintable but hungry for maintenance. Weigh the cost over the years you plan to own the house.

Frequently Asked Questions

How do I calculate the wall area of my house?

Measure each wall's length and height and multiply, then add the triangular gable areas at the ends. A quick approximation is the footprint perimeter times the wall height, with an allowance for gables. Subtract large openings such as garage doors. The calculator hint reminds you to use wall area, not floor area.

Which siding lasts longest?

Fiber cement and metal typically have the longest service lives with minimal maintenance, and both resist rot, insects and fire better than wood. Vinyl is inexpensive and low maintenance but can crack in extreme cold and fade over time. Wood needs the most upkeep but can be repaired and repainted indefinitely.

Do I have to remove the old siding?

Not always. Some materials can be installed over existing siding if the wall is flat and structurally sound, which saves removal and disposal cost. But layering hides rot and water damage, and many installers prefer to strip to the sheathing so the house wrap and flashing can be checked.

Does the quote include trim and painting?

Usually not. Trim, corner boards, soffit, fascia and painting are often separate line items, and on some houses trim is a meaningful share of the total. Ask each contractor to itemize trim and finish work so that two quotes can be compared on equal terms.