Deck Replacement Cost Calculator

Worked example

With these inputs:

• Deck area: 240 sq ft
• Scope of work: Boards only — keep existing frame
• New decking material: Composite
• Existing frame condition: Solid — no repairs expected
• Who's doing the work: Contractor installed

Rule of thumb: if the frame is sound, resurfacing costs 55-65% of a full rebuild and is almost always the better value. If joists, ledger, or footings are compromised, rebuild — new decking over a failing frame is money on top of a safety problem.

How it works

Decide between replacing boards, resurfacing with new railing, or a full tear-down and rebuild. This calculator prices all three paths — including demolition and disposal — so the comparison is honest.

Frequently asked questions

How much does it cost to replace deck boards?

Boards-only replacement runs $18-$28 per square foot installed for pressure-treated and $30-$42 for composite, including tear-out and disposal. A 240 sq ft deck typically lands between $4,300 and $10,000.

Is it cheaper to repair or replace a deck?

Resurfacing (new boards on a sound frame) costs roughly 55-65% of a full rebuild. If more than about a third of the joists are soft or the ledger is rotted, a rebuild is cheaper over the deck's life.

How much does deck removal cost?

Demolition and disposal runs $4-$8 per square foot, or roughly $1,100-$2,000 for a 240 sq ft deck including a dumpster. Elevated decks and concrete footing removal push toward the top of the range.

Can I put composite decking over old joists?

Only if the joists are sound and spaced 16 inches on center or tighter — composite sags on 24-inch spacing. Inspect every joist, replace soft ones, and add joist tape before the new boards go down.

How long do deck boards last?

Pressure-treated boards last 10-15 years with regular staining, cedar 15-20, composite 25-30, and PVC 30-plus. Framing under a well-flashed deck often outlives two rounds of decking.