Siding Installation Cost Calculator
Add up an installed siding job from the numbers on your own quote: net wall and gable area × your price per square foot, plus labor and add-ons, minus any discount, with a contingency buffer on top.
Siding 1,336 sq ft at $7.00 a square foot plus labor and add-ons is about $10,287.20 with 10% contingency (installed siding runs about $4–13/sq ft all-in by material — labeled). Enter the prices from your own quotes — a planning estimate, not a bid.
1 Enter your numbers
Installed siding cost is a quantity × unit-price sum, not a mystery. Once you know the net area you are covering — the walls (perimeter × height) plus the gable triangles, minus the doors, windows and garage openings — the rest is arithmetic: multiply by the price per square foot from your quote, add the line items your contractor breaks out separately (labor, tear-off, house wrap, insulation board, trim, soffit and fascia, corner posts, permits), subtract any discount, and keep a contingency in reserve for the things a walk-around never catches.
The one rule that matters: every dollar figure here is a number you enter. We hardcode no material price and no labor rate, so the estimate stays correct whatever the market does. The installed bands in the reference table are a sanity check on the price you were quoted, nothing more.
Formula
Cost model:
total = (net_area_sqft × $/sqft + labor + add_ons − discount) × (1 + contingency)Contingency is applied to the whole subtotal, because a 10% overrun hits labor and add-ons just as it hits material. The area itself is perimeter × wall_height + Σ½×base×height − openings — compute it in the how-much-siding tool and carry the number here.
Worked example
A house with 1,336 sq ft of net siding, quoted at $7.00 a square foot all-in, no separate labor or add-ons, with a 10% contingency:
subtotal = 1,336 × $7.00 = $9,352.00
total = $9,352.00 × 1.10 = $10,287.20So about $10,287. That $7 sits mid-band for the all-in $4–13/sq ft range across materials, so the figure is plausible — but it is a planning number, not a bid.
What drives the price (and where estimates go wrong)
- Measure the net area, not the footprint. Gables and dormers add area a floor-plan misses; openings remove it. A 5–10% error in area is a 5–10% error in the whole estimate.
- Know what your $/sq ft includes. An all-in rate already carries labor; a material-only rate does not. Double-counting labor is the most common overestimate.
- Tear-off is not free. If you are replacing siding, the old material has to come off and be hauled away — put it in add-ons here, or use the dedicated replacement and removal tools.
- Keep the contingency. Rotten sheathing behind old siding, extra flashing and trim, and access difficulties are the usual surprises; 10% is a sober default, more on an older or complex house.
Reference table
| Material | Installed, all-in ($/sq ft) |
|---|---|
| Vinyl siding | $3.00–$8.00 |
| Engineered wood / LP SmartSide | $4.00–$9.00 |
| Aluminum siding | $4.00–$9.00 |
| Steel siding | $6.00–$12.00 |
| Wood / cedar siding | $5.00–$12.00 |
| Fiber cement / James Hardie | $6.00–$13.00 |
Labeled published planning bands — a sanity guide only, not a price you should plug in. Enter the real number from your quote; costs vary by material and exposure, wall and gable geometry, waste and trim, tear-off, house wrap and insulation, complexity, region and labor.