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Decks · FAQ

Deck FAQ

Most deck decisions come down to four questions: what it costs, whether you need a permit, wood versus composite over time, and whether the frame is sound. A new deck averages about $14,000 nationally ($9,000-$20,000 common), or $15-$55 per square foot installed (Fixr). Wood lasts about 10-15 years with care against roughly 20 for composite. Guards are required above 30 inches of grade at a 36-inch minimum under widely adopted model guidance. A same-day “we can start Monday” pitch before the permit is pulled is the wrong moment to buy.

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40 questions answered

The three questions homeowners ask first

Answered in full here so you do not have to hunt. Everything else is grouped below.

How much does a deck cost in 2026?

National average is about $14,000, with most projects between $9,000 and $20,000, or $15-$55 per square foot installed depending on material and height. Platform decks run about $10-$30 per square foot; raised $25-$50; covered $40-$100. Labor alone is roughly $10-$35 per square foot. See our deck cost guide.

Is composite worth the extra money?

Often if you plan to stay. Composite runs about $28-$40 per square foot installed versus $15-$25 for pressure-treated pine, but wood needs restaining every two to three years at $2-$5 per square foot and lasts 10-15 years against roughly 20 for composite. Over a short hold, wood usually wins; over a long hold, the staining bill matters. See deck comparisons.

How high does a deck railing need to be?

Guards are required on decks more than 30 inches above grade and must be at least 36 inches high, with openings that will not pass a 4-inch sphere, under widely adopted model guidance (American Wood Council DCA 6 / related IRC concepts). Confirm local amendments with your building department. Railings installed can run $30-$210 per linear foot depending on material.

This page answers the cross-cutting deck questions that do not belong on a single service page - the awkward ones about ledgers, deposits, and what the inspector will want. Where a deeper page already owns the answer, we point there instead of restating it.

Three patterns cause most bad outcomes: shopping boards while ignoring the frame, skipping the permit, and resurfacing rotten joists. None of those require structural engineering knowledge to avoid.

Numbers below use 2026 published ranges. Your frost depth, height off grade and local labor rates still move the number - three itemized bids on the same drawing beat any national average.

This page answers 40 real homeowner questions about decks, grouped so you can skip to the stage you are in.

By topic

Cost and pricing

Each answer is self-contained. Where a deeper page exists, the last sentence links to it.

Roughly $3,600-$13,200 for 240 square feet, depending on material and deck height. Pressure-treated at ground level sits near the bottom; composite on a raised frame sits near the top. Stairs and railing are often the swing items.
About $10-$35 per square foot, varying with material and location. Repair-type work is often billed hourly at $50-$100 per hour plus a $50-$75 call-out fee. If a bid will not separate labor from materials, you cannot tell skill from markup.
Typically $100-$500. The amount and the requirements are set by your local building department - call them rather than relying on a national figure. The permit is cheap insurance at resale.
National average about $1,500, typical range $500-$3,000, or $10-$55 per square foot. Rot repair alone can run $300-$5,000; a sagging deck $750-$10,000. Joists are often $100-$300 each. See deck services.
Some - roughly 65.8% of cost recouped for wood and 63% for composite in published Cost vs. Value-style figures used in this archive. Build for use, not for return. See deck ROI.
Composite material is about $8-$20 per square foot but $28-$40 installed. The gap is framing, fasteners, labor at $10-$35 per square foot, and railing systems that price high. Compare complete drawings, not lumberyard stickers.

Hiring and quotes

Three itemized bids on anything over about $10,000, each on the same square footage, height, railing material and stair count. Deck pricing varies enormously by builder.
Framing, footings, decking, railing, stairs, permit responsibility, disposal of the old deck, and total cash price - line by line. A one-line total with no height or railing material is not a quote.
Whoever pulls the permit owns code compliance. Most builders will and should. If the contract makes the permit your job while they build, that is a warning sign, not a discount. See deck permits.
Yes. Resurfacing only makes sense if joists, beams, posts and the ledger are sound. Insist the contractor probe the ledger and joists and show you what they found before you buy new boards for a rotten frame.
Labor is $10-$35 per square foot, so savings are real. So is risk: guard posts, ledger attachment and footings are the three things that fail, and all three are code-governed. If you DIY, still pull the permit and get the inspection.
Document the inspection report, photos and dates. Most states require a chance to cure before full withholding. Do not occupy the deck until final approval - the standard deck construction guide states a deck should not be used until final inspection and approval.

The work itself

Under the American Wood Council’s prescriptive deck guide, framing is designed for a 40 psf live load plus 10 psf dead load. Footings must bear at least 12 inches below undisturbed grade or below the frost line, whichever is deeper.
A simple platform can be days once materials and permits are ready; raised multi-level or covered decks take longer. Permit and inspection calendars often dominate the schedule more than labor hours. Get a written day count and inspection sequence.
Resurfacing replaces boards and railing on existing framing. Replacement rebuilds the structure too. For a 300 square foot deck, repair often runs $500-$3,000 versus replacement about $6,000-$18,600. Replace when repair approaches new-deck cost, when the deck is over 20 years old, or when beams and joists need replacing.
Every two to three years. Budget $2-$5 per square foot for staining, or $4-$7 for restaining that includes power washing and stripping. Skipping it is what turns a repairable deck into a replacement. See deck maintenance.
Yes. Platform decks run about $10-$30 per square foot against $25-$50 for raised. They also avoid the guard requirement that kicks in above 30 inches off grade - a real cost and design change.
Widely adopted model guidance includes about a 7 3/4 inch maximum riser, 10-inch minimum tread, and handrails on stairs with four or more risers at 34-38 inches. Confirm local amendments. Stairs run roughly $75-$450 per step depending on construction.

Problems and emergencies

When repair cost approaches the price of a new deck, when the deck is over 20 years old, or when structural members like beams and joists need replacing. Cosmetic problems favor repair; structural ones do not. See deck problems.
Soft or bouncing framing, a pulling ledger at the house, guard posts that move, and stairs with failed stringers. Close the deck to use until a competent inspection. Cosmetic board cupping can wait; connection failures cannot.
The ledger is the connection to the house. Failures there are a leading cause of deck collapses. Ledger boards must be a minimum nominal 2x8 under the prescriptive guide, correctly flashed and fastened - not nailed into brick veneer or rotten rim joists.
That is usually a symptom treatment for heat loss and ventilation problems, not a decking fix. For roof ice dams, air sealing and insulation of the house matter more. Do not let a cable quote replace a structural or moisture diagnosis.
Aluminum should not be in direct contact with lumber treated with copper-based preservatives such as ACQ, Copper Azole, or ACZA. Use compatible fasteners and hardware, and field-treat cut ends with an approved preservative.

After the job, warranty and maintenance

Wood decks last at least 10-15 years with regular care; composite is generally expected to last around 20. Installation quality, flashing and maintenance move the outcome more than brand badge alone.
Usually separate layers: manufacturer coverage on composite boards or rail systems, and builder workmanship on framing and connections. Parts warranties often require registration and proper install. Read what voids coverage - wrong fasteners are a common one. See deck warranties.
After final inspection and approval. Under the standard deck construction guide, a deck should not be used or occupied until then. Using it early can create liability and inspection problems.
It still needs cleaning; it does not need staining. Follow the manufacturer’s cleaner list - pressure washing too aggressively can void warranties. Inspect flashing, fasteners and guard posts annually like any deck.
Document the same day, notify in writing, and use liability insurance if needed. Ask for a certificate of insurance before work starts. Ledger work that opens your exterior envelope should include weatherproofing restoration in the scope.

Uncomfortable questions worth asking

No. A commission-driven consult is a sales visit. Treat material upgrades and “you need composite for safety” claims as hypotheses. Get three bids on the same drawing and verify permit requirements with the building department yourself.
Height off grade, footing depth, railing system ($30-$210 per linear foot), stair construction, and whether the old deck tear-out is included. Board brand is a small slice. Compare framing and railing line items before chasing the logo.
It depends on the contract and state consumer-protection law. Many agreements allow retention of costs already incurred; some three-day cooling-off rules apply to in-home sales. Read the cancellation clause before you sign.
You are weak once the structure is started. Pre-approve change-order rules: written approval, price cap, and what happens if you refuse. Decide railing material before the first estimate so a $30/ft wood rail does not become $210/ft glass mid-job.
Only if you asked for them before bidding. Those packages inflate quotes after you are emotionally committed. Price the structural deck first; add accessories as separate optional lines you can decline.
Honest limits

Questions where the honest answer is “it depends”

Jurisdiction, policy and house-specific questions. We give you the procedure for finding out, not a confident national guess.

Do I need a permit for my deck?

Almost always in many jurisdictions, but thresholds for small freestanding low decks vary. There is no national exemption you can rely on. Permits typically cost $100-$500. Call your building department with height, size and attachment details. More on deck permits.

What frost depth do my footings need?

Your local building official publishes frost depth. Footings must bear at least 12 inches below undisturbed grade or below frost line, whichever is deeper, under the prescriptive guide. No national map replaces that call.

Will my homeowners insurance cover a deck collapse or storm damage?

Policy-specific. Sudden weather damage is sometimes covered; deferred maintenance and unpermitted structures often create disputes. Call your insurer with the cause of loss and permit history before authorizing work you expect them to reimburse. See deck insurance context.

What size deck does my house “need”?

Only your use case and lot constraints answer that. Online square-footage rules ignore doors, grade, HOA limits and budget. Define how you will use it, then price platform versus raised on a real site visit.
How to use this page

Getting a real answer, not a sales answer

A few rules of thumb that apply across almost every question above.

  • Never buy on the first visit Same-day-only pricing is a pressure tactic. Sleep on any bid over about $10,000.
  • Three bids, one drawing Same square footage, height, railing and stairs. Otherwise you are not comparing decks.
  • Price the frame, not just the boards If a bid is cheap, the savings are almost always in the frame. Itemize footings, framing, decking and railing.
  • Get the permit in the contract Whoever pulls it owns compliance. Do not use the deck until final approval.
  • Compare 20-year cost for wood vs composite Add restaining every two to three years at $2-$5 per square foot before you call wood “cheaper.”
Sources

Where these figures come from

Sources last checked

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Who wrote and checked this

Written by

The HomeMatchup Content Team

Editorial
Reviewed by

Michael Thompson

Senior Home Improvement Reviewer · 20 years

Senior technical reviewer.

Team-written. Second-person reviewed. Sources dated. Report a correction.

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