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Deck Repair

Deck Repair near you

Decking rarely fails all at once in this climate. It goes soft at the board ends where water sits, green over in the shaded corner, works loose at the fixings, and then one post moves when someone leans on the balustrade. Repair work covers replacing boards and sections of frame, refixing or rebuilding guarding and steps, dealing with rot where the deck meets the house, and the cleaning and treatment that decide whether the repair holds.

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Two questions decide how big the job is. The first is whether the damage is in the surface or in the structure underneath, which is why any honest assessment starts with someone getting under the deck with a torch and a screwdriver rather than pricing from photographs. The second is whether the repair changes anything the planning rules care about. Like-for-like repair of decking within the permitted development conditions is one thing; raising the height, extending the area or replacing a low deck with a raised platform re-opens the 30cm height limit, the 50 per cent garden coverage condition and, at a listed building, the fact that no decking or platform is permitted at all within the curtilage.

Signs British decking needs repair rather than another clean

Walk the deck first, then look underneath. Press a screwdriver into suspect timber: sound wood resists and rotten wood gives way or lifts in fibres. Pay attention to board ends, the base of posts, anywhere a planter has sat for years and the line where the deck meets the wall of the house.

  • Boards that flex, sound hollow underfoot or have gone dark and soft at the ends.
  • A balustrade or handrail that moves when you lean on it, or posts that rock in their fixings.
  • Fixings that have lifted, rusted or stained the timber around them, and joist hangers showing corrosion.
  • Green or black growth that returns within weeks of cleaning, which usually means the surface is not drying.
  • Standing water on the deck after rain, or gaps between boards blocked with leaves and moss.
  • Movement or bounce across the middle of the deck, suggesting the frame or its supports are failing rather than the boards.
  • Damp, staining or moss on the house wall behind the deck, particularly if the deck sits at or above the damp-proof course.

When to stop using a deck until it has been assessed

Some faults are not wear and should take the deck out of use. Guarding that gives when someone leans against it, a post that can be rocked by hand, or a frame pulling away from the house are all failures that tend to show themselves when the deck is busiest. The building regulations treat barriers as a safety requirement precisely because falls from a raised platform injure people, so a balustrade that moves is not something to live with until spring.

  • Keep people off the affected area, and lock or block the door onto a raised deck if the guarding is unsound.
  • Move heavy planters, furniture and barbecues off the section you are worried about if it is safe to do so.
  • Resist the temptation to add a few screws to a loose balustrade: a fixing into soft timber can feel solid and still fail under load.
  • Photograph the damage before anything is moved, which helps contractors quote and supports any insurance claim.
  • Ask for an assessment that includes the underside of the deck and the fixings into the house, not just the visible boards.

Repairing decking or rebuilding it: judging the frame, not the boards

Boards are the cheap part and the easy part to judge. What decides between repair and rebuild is everything under them: the joists, the bearers, the posts and how the deck is supported at the house. If those are sound, new boards, a new balustrade and rebuilt steps can add years. If rot has travelled into the frame, new boards on top simply hide it, and the deck keeps deteriorating out of sight.

There is a middle route that often makes sense on a deck that was built well but finished cheaply: keep the frame and supports, repair or reinforce what needs it, and replace the whole deck surface and guarding in one go so everything ages together. It is also the moment to fix design faults that caused the damage, such as a surface that drains nowhere, a frame with no ventilation beneath it, or boards fitted tight so debris cannot fall through.

LokalMatch is a practical way to get that judgement from more than one contractor. You describe the deck once, including its age, height, material and what has gone wrong, and matched decking contractors and carpenters get in touch with you directly; they pay for the requests they receive. LokalMatch does not carry out repairs, does not set prices and does not vet, rank or recommend anyone, so comparing the assessments and checking insurance remain yours to do.

Replacing boards, balustrades and steps on an existing deck

Board replacement is the repair most homeowners consider doing themselves, and on a low deck with a sound frame it is reasonable: the old board comes up, the joist beneath is checked for softness, and a new board goes down on corrosion-resistant fixings with the cut ends treated. The moment the joist is soft too, or the damage runs across several bays, it stops being a board job.

Guarding and steps are a different matter, because they are what stops a fall. A new balustrade is only as good as what it is bolted to, so posts usually have to be replaced or reinforced rather than reused, and fixings need to reach solid frame timber. On a raised deck, the requirement that barriers be provided where they are needed to protect people from falling applies to the repair as much as to the original build, which is a good reason to have that part done by a contractor and to keep the invoice describing what was done.

Replacement timber, fixings and what happens to the old decking

  • Match the replacement to what is there: board thickness and width set the joist spacing that already exists, and a thinner board will flex.
  • Treat every cut end and any drilled hole in pressure-treated timber, because that is where protection stops and rot starts.
  • Use corrosion-resistant fixings compatible with treated timber; mixing metals is what produces the black staining around screw heads.
  • Composite boards usually have to be replaced from the same product range, and a discontinued colour may mean redoing a larger area for the sake of appearance.
  • Expect new timber to look wrong next to weathered boards for a season or more, which is why some owners replace a whole run rather than single boards.
  • Old decking is waste, and when a contractor takes it away it is business waste: they should be using a registered waste carrier and completing a waste transfer note.
  • Never burn treated timber on a garden fire; send it away with the contractor or to a facility that accepts it.

When decking repairs turn into work that needs permission

Straight repair usually raises no planning question, but three changes commonly do. Raising the deck, because in England the permitted development condition is that decking is no more than 30cm above the ground. Extending it, because the decking together with other extensions and outbuildings must cover no more than 50 per cent of the garden area. And rebuilding at a property where the rights do not exist: within the curtilage of a listed building no decking or platform is permitted, and on Article 2(3) designated land none is permitted at either side of the house.

The nations differ here too. Scotland's Class 3D allows a deck whose floor level does not exceed 0.5 metres, with a 4 square metre cap in a conservation area or within a listed building's curtilage, while the Northern Ireland order does not permit a deck where any part would exceed 0.3 metres above ground level. If the repair amounts to a rebuild, ask the local planning authority before starting, and treat a raised structure as work where building control has an interest: the Planning Portal's guidance is to assume the building regulations apply to any deck structure requiring planning permission.

Autumn and winter: the months that decide how decking ages

British decking does most of its deteriorating between October and March, when the surface barely dries and leaves sit in the gaps. A short autumn routine prevents a lot of spring repair: clear the gaps so water can drain through, clean off algae before the first frosts, move planters that hold a wet ring under them, and check that nothing has ponded on the surface after heavy rain.

Treatment is a seasonal job too. Timber treatments and oils need a dry, settled spell to go on properly, so the work belongs to a dry stretch rather than to a date in the diary, and a deck that has been cleaned and left to dry takes the product far better than one done in a hurry. If the deck is in constant use in winter, pay particular attention to the steps and the area immediately outside the door, which is where a slippery surface causes falls.

Deck Repair: frequently asked questions

Can I replace a few decking boards myself?

On a low deck with a sound frame, board replacement is within reach: lift the old board, check the joist beneath for softness, and fit a matching board with corrosion-resistant fixings, treating the cut ends. Stop if the joist is soft, if several bays are affected or if anything structural is involved. Guarding, steps and frame repairs on a raised deck are safety work and belong to a contractor.

Does repairing decking need planning permission?

Like-for-like repair generally does not, but changes can. In England the permitted development conditions include decking no more than 30cm above the ground and no more than 50 per cent of the garden covered by decking together with other extensions and outbuildings, so raising or extending a deck can take it outside them. Within the curtilage of a listed building, no decking or platform is permitted at all, so a rebuild there is a matter for the local planning authority.

My balustrade moves when I lean on it. How urgent is that?

Treat it as urgent on any raised deck. Barriers exist to protect people from falling from floors, balconies and stairs, and a guard that moves is failing at the only job it has. Keep people off the area, do not try to stiffen it with extra screws into timber that may be soft, and get the posts and their fixings assessed properly, since the guard is only as strong as what it is bolted to.

Why does my decking go green every winter?

Because it stays damp. Algae colonises a surface that never fully dries, which is common on decks built tight to the ground, shaded by planting or fitted with no gap for water to fall through. Cleaning helps for a season, but the lasting fixes are drainage and airflow: clear gaps, cut back planting, and where the deck is being rebuilt, make sure the underside is ventilated.

What happens to the old decking timber?

It leaves as waste, and when a contractor removes it that is business waste with a duty of care attached: it should go with a registered waste carrier and a waste transfer note should be completed for the load. Treated timber should not be burned in the garden. If you are doing the work yourself, check what your local household waste site accepts before you start pulling boards up.

Sources

  1. Planning Portal: decking
  2. The Building Regulations 2010, Schedule 1 (Part K, protection from falling)
  3. Town and Country Planning (General Permitted Development) (Scotland) Order 1992, Schedule 1
  4. Planning (General Permitted Development) Order (Northern Ireland) 2015
  5. GOV.UK: business waste duty of care
  6. Consumer Rights Act 2015, section 49

Written by the LokalMatch editorial team. Last reviewed 14 September 2026. How we write and check our guides

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What affects the cost of deck repair

Prices depend on the details of your project. We only publish price ranges when they’re backed by real LokalMatch quote data or reliable sources. Until then, here’s what usually changes the price:

  • Size and complexity of the piece or structure
  • Wood species or material
  • Custom design compared with standard sizes
  • Hardware, railings and finishing
  • Removal of what's there now
  • Permits and drawings, where needed

How to compare deck builders before you hire

  • Choose a carpenter whose past work matches your project, whether that's framing, trim, built-ins, stairs or a deck.
  • Ask for drawings or a clear description of what will be built, including materials and finishes.
  • For decks, stairs and railings, ask whether a permit is needed, since these are safety items.
  • Get a written quote that says who supplies materials and whether finishing, such as painting or staining, is included.
  • Ask how they'll handle surprises like rot or uneven walls and floors.

Questions to ask deck builders before you hire

  • Can you show me photos of similar work you've done?
  • What materials will you use, and why?
  • Does this project need a permit, and will you get it?
  • Is finishing, such as sanding, painting or staining, included?
  • How will you attach the work to the existing structure?
  • What warranty do you offer on your workmanship?

Deck repair permits and local rules

Some deck repair work needs a permit or has to meet local bylaws. Rules vary by municipality, so ask your pro whether a permit is needed and who will apply for it — and check with your city or town if you’re unsure.

Permits and licensing

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