Siding Replacement Cost Calculator
Replacing old siding? Get a total that includes tear-off, disposal, new material and labor — not just the new siding.
Walls (feet)
Gables / triangles optional
Windows & doors to subtract
Tip: measure each wall's width × height at its widest points. A per-wall audit table appears below so you can check every number.
Your siding squares, panels and cost appear here.
Estimated from wall count and perimeter — confirm against your actual corners and openings.
Cost per sq ft: – · per square: –
| Surface | Area (sq ft) |
|---|
Replacement is more than new siding
Replacing siding is a bigger job than new construction because you pay to remove what's there before you install what's new. That removal — prying off old boards, hauling debris, sometimes repairing sheathing or wrap underneath — is a real cost that budget calculators skip. This tool keeps removal switched on by default so your replacement number is honest.
Enter your walls, choose the replacement material, and set labor and removal rates. If the old wall needs new housewrap or minor repairs, add a little to your contingency by nudging the material price up.
Getting an estimate in a couple of minutes
There's no learning curve here. Enter what you measured and the tool does the conversions; the only judgment call is the waste percentage. Start by choosing your material at the top of the form, since that sets the coverage the math relies on. Then add your walls one line at a time — front, back and both sides — typing each width, height and quantity.
Next, deal with the parts a plain rectangle misses: add any gable as its base and rise, and subtract each window and door by size and count. Finally, set a waste allowance (10% for a simple house, more for a cut-up one) and, if you want a budget, turn on the cost fields. The result — squares, panels, boxes, accessories and price — updates as soon as you calculate, ready to print, copy or share.
New vs replacement
The same house costs more to re-side than to side new, because of tear-off and disposal. On a 20-square job, removal alone can add a meaningful chunk — which is exactly why it's a separate, visible line here.
Where these numbers come from
The measuring method follows standard exterior-takeoff practice: gross wall area minus openings, converted to squares at 100 sq ft each, with a waste factor for offcuts. Coverage and waste ranges reflect published manufacturer installation guidance from makers such as James Hardie and vinyl producers, and cost ranges reflect commonly reported US installed prices. Local prices, product lines and codes vary, so treat the output as a well-grounded planning estimate — a field measure and your contractor's quote govern the final order.
Before you place the order
The quantity is the easy part; a clean order depends on a handful of details around it. Here's what to nail down before you commit to buying siding replacement.
- Confirm coverage: the default coverage is a planning figure. Check the exact coverage printed on your product's box or spec sheet and adjust it if it differs, since even a small change moves the piece count on a big wall.
- Match the waste to your walls: keep 10% for a simple rectangular house, and raise it toward 15% for gables, dormers, bay windows and lots of angled cuts, because those details generate short offcuts you can't reuse.
- Account for accessories: starter strip, trim, inside and outside corners, flashing and fasteners are all part of a complete order, not an afterthought — the takeoff above estimates each so your material list is whole.
- Keep a spare: hold back a piece or a full box for future repairs, since profiles and colors get discontinued over time and an exact match years later is hard to find.
- Time your order: have material delivered close to the start date, stored flat and dry, so it isn't sitting exposed or getting damaged before the crew arrives.
Re-run the numbers above after any change and lean on the per-wall audit to verify each surface one at a time, so what you order matches what the wall actually needs rather than a rough guess. That small habit is the difference between one clean delivery and a mid-project trip back to the supplier.
Frequently asked questions
How much does it cost to replace siding?
Is removing old siding expensive?
Should I repair or replace my siding?
Does replacement include new housewrap?
What people say
"Removal-on made my replacement estimate match the contractor's within a few hundred dollars."