Decks · Service

Deck repair, and telling small from serious

Some deck faults are a Saturday. Two of them are the reason decks make the news. We match you with vetted local repair pros and help you work out, quickly, which kind you are looking at.

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In short

What is deck repair?

Deck repair covers everything from swapping a split board to rebuilding a rotted stair or refastening a guard that has worked loose. The useful division is not by cost but by consequence: cosmetic faults are ugly, structural faults are dangerous. Two symptoms sit firmly in the second group — any movement where the deck meets the house, and a guard rail that flexes when you lean on it.

Triggers

Signs you need deck repair

A guard rail that gives when you push it, at any height, on any section
A visible gap opening between the deck and the wall of the house, or fasteners at that line showing rust streaks
Bounce in the middle of a span that was firm when you moved in
A post that a screwdriver sinks into near ground level, or that has visibly darkened and softened at the base
Stair treads that flex, stringers that have split at the notches, or a stair that has separated from the deck edge
Individual boards splitting, cupping or lifting fasteners across the surface
Standing water sitting on the deck long after rain has stopped, or persistent damp dark patches
Rusting or missing structural connectors visible from underneath

Seeing something not on this list? Browse decks problems by symptom →

The job

How deck repair actually works

Diagnosis from underneath, not from the surface

A repair pro should get under the deck and look at the ledger connection, the posts at their bases, the beams, the joist hangers and the stair stringers. Most of what makes a deck unsafe is invisible from the top, and most of what is visible from the top is cosmetic.

Watch for: A quote for board replacement written without anyone going under. Replacing boards over a compromised frame produces a deck that looks new and is not safer.
Sorting the list into safety and appearance

You should be told plainly which items make the deck unsafe to use now, which will make it unsafe within a season or two, and which are simply cosmetic. Those are three different budgets and they do not have to be spent at once.

Watch for: A single undivided quote. It removes your ability to prioritise, and it is how a $600 safety issue turns into a $6,000 refresh you did not need this year.
The repair itself

Board replacement, sistering or replacing a damaged joist, rebuilding a stair, refastening or rebuilding a guard, replacing corroded connectors, adding or correcting flashing at the ledger. Repairs that touch structure often mean pulling boards to get access, so the surface rarely comes through untouched.

Watch for: Repairs that stop at the symptom. A rotted joist end usually means water has been arriving there for years — if nobody finds and fixes where it comes from, the new timber follows the old one.
Permit, where the repair becomes structural

Cosmetic replacement generally does not need a permit. Rebuilding a stair, altering a guard, replacing framing members or reworking the ledger frequently does, and the work is then judged against current requirements rather than what was originally there.

Watch for: Structural work carried out as "maintenance" to avoid an inspection. If somebody is rebuilding your stairs or your guard, that is exactly the work an inspection is for.
Handover and the honest verdict

A repair pro who has been under your deck knows roughly how much life is left in it. Ask for that assessment in plain terms, and ask whether they would spend money on it again next year.

Watch for: Silence on remaining life. If a builder repairs a deck they privately think is finished and does not say so, you will spend the same money twice.

Money

What does deck repair cost?

Small repairs — a few boards, a loose section of guard, one stair tread — are usually a few hundred dollars. Once framing, posts or the ledger are involved it climbs quickly into the low thousands, because getting to them means lifting the surface first.

See the full deck repair cost guide — by material, size and region →

Straight answer

When deck repair is the wrong call

Everyone else ranking for this is paid when you say yes. Here's when you shouldn't.

The repair list is approaching the price of replacing the deck. At that point you are buying an old structure at new-structure prices, and the parts nobody quoted for will fail next. Ask for both numbers side by side before you agree to the repair.
The ledger is the problem. A ledger that was never flashed has usually been feeding water into the rim joist of your house for years. That is not a deck repair, it is a house repair with a deck in the way, and patching the deck side of it changes nothing.
Multiple posts are soft at the base. One rotted post is a repair. Several means the whole ground-contact detail was wrong or the footings are wrong, and replacing posts one at a time on the same detail just resets the clock.
You are repairing to sell and the fault is structural. A cosmetic tidy-up is fair game. Making a structural defect invisible before a sale is a disclosure problem, and home inspectors look under decks specifically because people do this.
You already intend to change the deck. If a new layout, a hot tub or an extension is coming within a year or two, repair only what makes it safe to use in the meantime and put the rest of the money into the real project.
Nobody will go underneath. If the deck is too low or too enclosed for anyone to inspect the frame, a repair quote is speculation. That is an inspection problem to solve first, sometimes by lifting boards.

Straight answer

Can I do this myself?

Guard rails and anything at the ledger are not homeowner repairs. Both fail suddenly and both fail while the deck is in use. A guard that feels solid after you have driven a few longer screws into the same rotted post is more dangerous than one that obviously wobbled, because it no longer warns you.

Reasonable to DIY

Replacing a split or cupped surface board that carries no guard post
Re-driving or replacing surface fasteners that have backed out
Clearing debris from between boards and from the joist tops beneath them
Sanding a splintered area on a wood deck

Call a licensed pro

Anything involving a guard rail or its posts
Anything at the ledger, including reflashing
Stair stringers, treads and stair guards
Joists, beams, posts and structural connectors
Any fault where you cannot see where the water is coming from

Before you sign

What to check when hiring for deck repair

Did you get underneath, and what did the ledger look like?

The first question, and the answer tells you immediately whether the quote is a diagnosis or a guess.
Which of these items make the deck unsafe to use right now?

You are entitled to that distinction. It lets you fix the dangerous things this month and the ugly things whenever.
Where is the water coming from, and is that part of the fix?

Rot is a symptom. A repair that renews the wood without stopping the water is a repair with a countdown on it.
Does any of this work need a permit?

Stairs, guards, framing and ledger work frequently do. A pro who reflexively says no to all of it is telling you they would rather not be inspected.
Roughly how much useful life is left in this deck?

The person under it knows. Asking directly is the cheapest way to avoid repairing something that should be replaced.
Will the repaired boards match, and do you mind if they do not?

Replacement boards rarely match weathered ones, and on composite the original colour or product may be discontinued. Better to expect it than to be annoyed by it.

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Local pros

Deck Repair near you

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Related work

Often done at the same time

Deck Inspection

A written verdict before you spend

Deck Resurfacing

When the frame is fine and the surface is not

Deck Replacement

When repair stops making sense

Deck Railing Installation

When the guard has to be rebuilt

All decks services →

FAQ

Deck Repair — questions people ask

Still have a question? Talk to our team →

How do I know if a deck problem is dangerous or just ugly?

Ask what would happen if it kept getting worse. A split board splits further and eventually someone catches a foot. A guard that flexes, or a deck that is moving at the wall, ends with people falling — often several at once, because those elements fail under exactly the crowded conditions decks get used in. Anything involving guards, stairs, posts, or the connection to the house belongs in the second category and should be treated as stop-using-it until a professional has looked.

Is a wobbly railing a quick fix?

Sometimes, and often not. If the guard posts are properly attached to the framing and a fastener has worked loose, it is genuinely quick. If the posts are bolted only through the deck boards, or the timber they are fixed into has softened, then tightening what is there produces something that feels solid and is not. That distinction cannot be made from the top of the deck, which is why this one is worth a professional look even though it seems trivial.

Can rotted deck boards be replaced individually?

Yes, and it is one of the more straightforward repairs. Two caveats. Matching is imperfect — a new wood board next to twenty-year-old wood will stand out for a season or two, and a composite product may simply no longer be made in your colour. And rot in the surface often means the joist beneath it has been sitting wet too, so the board coming up is the moment to check what it was sitting on.

Do I need a permit to repair a deck?

For like-for-like replacement of surface boards, usually not. For rebuilding stairs, altering or rebuilding guards, replacing framing members, or any work on the ledger, frequently yes — and it varies by jurisdiction. The practical test is whether the work affects the structure or the safety elements. Where it does, the inspection is doing you a favour, because it is an independent check on a repair you cannot easily verify yourself.

My deck bounces. Is that a problem?

It is worth investigating rather than ignoring. Some spring in a deck is normal and simply reflects how it was framed. Bounce that has appeared or worsened over time is different — it usually means something has changed underneath, whether that is a joist that has rotted at its end, a beam that has lost bearing, or a post that has settled. New bounce is a symptom of movement, and movement is what you want a professional looking at.