What Deck Replacement Costs, and When Repair Stops Winning
What this comes down to
- A full rebuild starts at roughly two and a half times a new surface over the same frame.
- Deck boards are the cheapest part of the structure and the worst guide to replacing it.
- Softwood lumber moved about six percent between April and July 2026, so a quote ages.
- Framing within six inches of soil needs a heavier treatment than decking stock carries.
- A new pressure treated deck starts at $24 per square foot, a surface re-deck at $10.
- A 12 by 16 deck rebuilt from the footings up starts at $4,495 in DuPage County.
A new pressure treated deck starts at $24 per square foot. A surface re-deck over a frame that is still sound starts at $10. The gap between those two figures is the whole decision.
What follows prices a full replacement and the cheaper version of it. It gives the point where repair spending stops making sense. It also covers why a deck quote does not hold for long.
What does deck replacement cost?
A new pressure treated deck starts at $24 per square foot in DuPage County. A typical 12 by 16 deck, 192 square feet, starts at $4,495. Both figures assume new footings and a new frame.
That price buys the whole structure. Footings, posts, beams, joists, a ledger connection, decking, railings and stairs are all inside it. Material is a smaller share of it than most people expect.
Replacing only the walking surface is a different job at a different price. Board replacement over a sound frame starts at $10 per square foot. A typical 200 square foot re-deck starts at $1,995.
Which of those two you are quoted for is not a preference. It is a finding, and it comes from the frame rather than the boards. A deck that fails the frame test cannot be re-decked at any price.
Why does a full rebuild cost more than twice a re-deck?
Because almost everything below the boards is rebuilt with them. The footings, the posts, the beams, the joists and the ledger are all new work. The decking is the last layer to go down.
Digging is the part nobody prices in their head. Footings in northern Illinois go below the frost line. Each one is dug, formed, inspected and poured before a single joist appears.
A re-deck skips all of that. The frame is already in the ground and already carrying load. The work is fasteners and boards, which is why the square foot figure falls by more than half.
How long should a deck last before it needs replacing?
Longer than most people are told, and shorter than the lumber warranty suggests. Treatment slows decay, it does not stop it, and the frame ages faster than the surface does.
The American Wood Protection Association sorts treated lumber into use categories. Framing within six inches of soil needs a ground contact rating. That is a heavier treatment than most decking stock carries.
So a deck can have sound boards over posts that are already going. The boards are replaceable and cheap. The posts are neither, which is the reason a surface inspection settles nothing.
Span matters as much as treatment does. The American Wood Council's deck guide carries published span tables. They give a maximum joist span for each size and spacing.
Which part of the deck decides whether the frame can stay?
The ledger, the joists and the posts, in that order. Each one is checked with an awl rather than a photograph. Soft timber looks exactly like sound timber under paint.
The ledger matters most of the three. It is the board bolting the deck to the house, and it fails quietly. A ledger that has gone soft takes the frame decision out of anyone's hands.
Joists come next. Sistering a soft joist is cheap, and repair priced by job wins while the count stays low. Past roughly a third of them, the frame itself is the problem.
Posts and footings are last, and they are the ones that end the argument. A post rotting at the concrete cannot be sistered. It comes out, and taking it out means lifting the frame above it.
Does a bigger deck cost less per square foot?
A little, and less than people hope. The fixed costs spread over more area. Mobilization, the permit and the stair run do not double when the deck does. That is the whole of the discount.
Height is what scales badly, not area. A deck three feet up and a deck ten feet up are different structures. The posts, the bracing and the stair run all change with it.
Stairs are the other one. A flight is its own small structure, with stringers, a landing and a footing. Two flights cost close to twice what one does. They are priced separately for that reason.
Why does a deck replacement quote have a shelf life?
Because the material half of it is priced on a commodity that moves every month. The Bureau of Labor Statistics tracks softwood lumber in a monthly lumber index. That index is the floor under every board on the quote.
It has moved noticeably this year. The index read 282.9 in April 2026, 300.5 in July, and 294.9 in August. That is roughly a six percent swing inside one building season.
So a figure quoted in the spring is not automatically the figure in midsummer. A quote with a stated expiry is being honest about that. One that never expires is carrying the risk somewhere else.
Labor is the steadier half and it is also the larger one. A deck rebuild is mostly hours: digging, setting, cutting, fastening and railing. Material is the part that argues with the calendar.
What does each deck replacement job start at?
These are starting prices for deck work in DuPage County, not quotations. The wider market column carries 2026 Chicago area cost data. It is there so each figure can be read against something.
| The work | Starting price | Wider market | What moves it |
|---|---|---|---|
| New pressure treated deck, built from new | From $24 per sq ft | $26 to $50 per sq ft | Height off the ground, footing count and stair flights |
| Typical 12x16 deck, 192 sq ft | From $4,495 | $4,700 to $9,300 | Whether new footings and a new ledger go in |
| Surface re-deck over a sound frame | From $10 per sq ft | $12 to $25 per sq ft | Whether the joist edges still hold a fastener |
| Typical 200 sq ft re-deck, boards only | From $1,995 | $2,400 to $5,000 | Board material and how much railing goes back |
| Railing replacement | From $35 per linear ft | $40 to $100 per linear ft | Run length and whether the posts are sound |
| Deck staining and sealing | From $2.50 per sq ft | $3 to $7 per sq ft | Board age and how much preparation is needed |
Every figure above assumes a frame that has been looked at first. Anything found under the boards is quoted on its own. It is never folded into the square foot number.
A permit belongs in the budget too. DuPage County Building and Zoning publishes what the county requires for a deck. A replacement counts as new work, not as maintenance.
Rot that has left the deck and reached the house is a separate job. It gets priced as structural rot repair instead. That work is quoted on its own, never folded in.
What cannot be determined before the boards come up?
Whether the joists still hold a fastener. A joist can look sound and still be too soft at the top edge to take a screw. Nothing but lifting a board shows that.
What the ledger is bolted with. Lag screws, through bolts or nails all look identical once the trim is on. The fastener decides whether the ledger can stay.
How deep the footings actually go. A footing above the frost line will heave, whatever the deck above it looks like. That is found by digging, not by looking.
What the boards are hiding at the wall. Water tracks behind the ledger and works on the rim joist of the house. That damage is invisible until the decking is off.
All four are checked on site before a figure is written down. The quote is then carried out by the same crew that wrote it. That is what makes a starting price mean anything.
Deck replacement cost questions
How much does it cost to replace a deck?
A new pressure treated deck starts at $24 per square foot in DuPage County. A typical 12 by 16 deck starts at $4,495. The wider Chicago area market runs from $26 to $50 per square foot. Height off the ground and the number of footings move it most.
How does Perfect Work decide between rebuilding a deck and re-decking it?
Perfect Work Remodeling & Repairs probes the ledger, the joists and the posts with an awl. A surface re-deck is offered where the frame passes that test. Where the ledger or a third of the joists are soft, it is priced as a rebuild instead.
Is it cheaper to repair a deck or replace it?
Repair is cheaper until the frame is the thing being repaired. Board work, railing work and a few sistered joists stay well below a rebuild. Once footings, posts or the ledger come into it, the labor is a rebuild's labor. The saving then disappears.
How long does a pressure treated deck last?
The surface usually outlives its reputation and the frame usually does not. Boards that get weather but can dry between soakings run two decades. Framing near soil, or under a deck with no airflow, ages far faster. Treatment slows decay, it does not stop it.
What does a deck replacement estimate from Perfect Work include?
The visit, the probe test and the written figure carry no charge. Perfect Work Remodeling & Repairs prices demolition, footings, frame and decking as one number. The railing and the permit are listed in it too. Anything found behind the ledger is requoted first.
Do I need a permit to replace a deck in DuPage County?
Yes. A replacement deck is new construction rather than maintenance, so it is permitted as new work. The county wants a plan showing footing depth, joist size and spacing, and the ledger fastening. Unincorporated DuPage and each town run their own review.
Getting a replacement number that holds
A deck replacement price is easy to state and easy to get wrong. The number turns on what is under the boards, which an hour with an awl settles. Neither the visit nor the written figure is charged for.
A visit from Perfect Work Remodeling & Repairs means a board comes up and the awl goes in. The ledger fastening is checked before any price is written. Anything deeper than the deck is requoted in writing first.
Work that stops at the surface books as deck repair work on a single visit. Where the frame is the question, the argument is set out in what the frame decides. Both routes are quoted the same way.
Call Perfect Work at 630-297-7888 · Book a deck check