Decking
Timber or composite decking on the coast?
A deck in Whitley Bay, Tynemouth or Seaton Sluice has a harder life than one in a sheltered city garden. Salt in the air, wind-driven rain and damp shady corners all change which board makes sense and how it should be built.
By the Gardens North East teamPublished , 3 min read
What the coast does to a deck
Near the sea, the air carries salt that settles on every surface. Wind drives rain into joints and dries boards unevenly. On the North East coast, decks in the shade of a house or wall can stay damp for long spells in winter, which is when green algae takes hold and boards turn slippery.
None of this rules decking out. It means the choice of board, the fixings and the frame underneath all matter more than they would further inland.
Timber and composite side by side
| Treated timber | Composite | |
|---|---|---|
| Look | Natural grain that silvers with age unless oiled or stained | Even colour; quality varies a lot between products |
| Upkeep | Regular cleaning and re-treating to keep it in good condition | Cleaning, but no sanding, staining or oiling |
| In damp shade | Can grow algae and go slippery; rot risk where water sits | Can still grow surface algae if not cleaned; does not rot like timber |
| In strong sun | Stays fairly cool underfoot | Darker boards can get hot in direct summer sun |
| Repairs | Single boards are easy to replace and sand back | Boards are replaceable, but colours may differ as older boards weather |
| Upfront cost | Usually lower | Usually higher |
The parts people forget
The frame underneath
Most deck failures start below the boards. Joists need to be sound, properly spaced for the board being used, and kept off wet ground with air moving underneath. A composite deck on a poor timber frame will not outlast the frame. The decking section has more on planning a build.
Fixings near the sea
Ordinary steel screws and hidden clips can corrode in salty air, leaving rust stains and loose boards. Stainless steel fixings are the usual choice on the coast. Ask what will be used before work starts.
Grip
Grooved and textured boards help, but no board stays grippy under a layer of algae. Placing the deck where it gets some sun and wind to dry it, and cleaning it each spring and autumn, does more for safety than the choice of material alone.
Height and planning
Under the general permitted development rules, a raised platform such as a deck should be no more than 300 mm above the ground. Higher decks, which are common on sloping coastal gardens, usually need planning permission. Decks also count towards the limit on how much of the garden can be covered by outbuildings and other additions. The Planning Portal's outbuildings guide has the detail.
So which?
If you enjoy looking after timber and like the way it weathers, a well-built treated softwood or hardwood deck with stainless fixings is a sound choice on the coast. If you want to spend summer on the deck rather than maintaining it, composite is usually the better fit, provided the frame and fixings are right and you accept that it still needs a clean.
For a sense of what thrives in salt wind before you plan the planting around your deck, the gardens at Seaton Delaval Hall and Lindisfarne Castle are worth a visit.
If you are leaning towards composite, Composite Decking Newcastle supplies and fits it, with a colour consultation at home first. For timber or composite designed around your garden, Newcastle Decking starts with a measured design visit.
Questions readers ask
Does composite decking need any maintenance?
Yes, though less than timber. Expect to clean it, particularly in shady or damp spots where algae and dirt build up.
Is hardwood better than softwood near the sea?
Dense hardwoods naturally resist rot well but cost more. Pressure-treated softwood is widely used and lasts well if it is maintained and kept off wet ground.
Does a deck need planning permission?
Usually not if it is no more than 300 mm above the ground and within the other permitted development limits. Higher decks generally do.
Thinking composite?
If composite suits your garden, it is worth seeing board colours in your own light before choosing. This Newcastle business supplies and fits composite decking in three set packages, with a colour consultation at home first.
Composite decking supplied and fitted in three set packages, with a colour consultation at home first.
A measured design visit and concept drawing first, then a timber or composite deck built.
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Places mentioned
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Seaton Delaval Hall
A garden close to the coast.
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Lindisfarne Castle garden
A walled garden designed by Gertrude Jekyll.
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Longsands Beach
Sources
Checked October 2026.
