What does it cost to tear out and replace a deck in Boise?

What does it cost to tear out and replace a deck?

A replacement is a demolition job plus a new deck, and the demolition is the part people forget to budget. The table breaks a typical replacement into its pieces, with the source and year for each figure.

For a 300-square-foot deck, Fixr's demolition range alone is $1,500–$4,500. Add the new deck at $11,000–$21,000 for composite and you are near the middle of Fixr's full-replacement band, before railing and stairs. Our calculator lists demolition as priced at the site visit because haul distance, deck height and what is underneath vary so much.

Timing matters more on a replacement than on a new build. Tear-out leaves the back door with no landing, so the gap between demolition and the new deck should be short. Scheduling the footing pour between Boise's median last freeze (April 24) and first freeze (October 21) keeps that gap predictable, and having the permit approved before demolition starts keeps it shorter still.

Should you replace, resurface or repair?

The frame decides. If footings, posts, beams, joists and the ledger are sound and spaced for your new boards, resurfacing keeps the structure and replaces only what you see. If the structure is the problem, new boards on a failing frame waste money.

Our repair-or-replace guide has the full inspection walk-through. If the frame passes, deck resurfacing is usually the cheaper path; if it does not, deck replacement starts from the footings up.

Hidden problems that push replacement costs up

The surprises are almost always under the boards or behind the ledger. These are the ones that most often change a replacement price after demolition starts.

• Ledger damage. Older decks were often bolted to the house without flashing. Water runs behind the ledger, rots it and can damage the house rim joist, which then has to be repaired before a new ledger goes on.
• Shallow footings. Footings that stop short of 24 inches heave in Boise's freeze-thaw cycles; they are usually removed rather than reused.
• Posts set in soil. Wood posts buried in the ground rot at grade even when treated, and are replaced with posts on footings and standoff bases.
• Undersized framing. Joists spaced for 2× wood decking may be too far apart for composite.
• Guard and stair upgrades. New railing must meet current rules: 36 inches minimum on decks over 30 inches high, with openings that stop a 4-inch sphere.

Ask for unit prices for hidden work up front (per joist sistered, per footing replaced, per linear foot of ledger) so the change order after demolition is a known number rather than a negotiation.

Why older Boise neighborhoods cost more to rebuild in

Age, access and overlays all stack up in established neighborhoods. A 1990s deck in Southeast Boise and a 1930s house in the North End need very different replacement plans.

• Permits: any rebuilt deck over 12 inches high in Boise or Nampa falls under the same permit rule as a new one, so treat a full rebuild like new construction. Confirm with the city whether your scope needs one.
• Historic districts: exterior changes in Boise's local historic districts generally need a Certificate of Appropriateness before the building permit, which adds a review step in parts of the North End and East End.
• Access: narrow lots, detached garages and alley-only access in older neighborhoods slow demolition and delivery.
• Mature trees: roots near footing locations can force a different post layout.
• Disposal: a large wood deck can fill more than one dump trailer, and composite boards cannot go into wood recycling.

Neighborhood specifics are on the North End page and the Southeast Boise page.

Does replacing an old deck pay off?

A tired deck counts against a listing, and a new one recovers much of its cost. For new deck additions in the Mountain region, which takes in Idaho and several neighboring states, the 2025 Cost vs. Value report estimates about 97% of cost recovered for wood and 82.1% for composite. Those are new-deck estimates, not replacement-specific ones, and they do not include demolition. The stronger case for replacement is often safety: a loose ledger or rotted post is a liability whether or not you sell.

Home inspections are where an old deck usually gets noticed. Inspectors commonly flag missing ledger flashing, loose guards and posts set in soil, and a buyer's repair request on a failing deck can cost more in negotiation than a planned replacement would have. If you expect to sell within a few years, having the deck looked at now tells you whether you are facing a repair, a resurface or a rebuild.

What a replacement quote should spell out

1. Demolition, haul-off and disposal priced as separate lines.
2. A written list of what is reused (if anything) and what is replaced, with photos of the existing frame.
3. Ledger removal, flashing and reattachment described, including repair of the rim joist if needed.
4. Footing plan: new footings to 24 inches, or a stated reason for reusing old ones.
5. Unit prices for hidden damage found after tear-out.
6. Decking line, railing type, stair count and permit responsibility, as with any new deck.

Before you collect bids, size the new deck in the deck cost calculator, then add demolition separately. The composite deck cost guide helps if you are switching from wood.