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Timber decking supplies, oak boards, joists and kits from UK Timber

Timber Decking Supplies

Shop timber decking kits, joists, Deckin' Blocks, screws and treatments, with oak, Douglas fir and Thermowood boards from our Corby sawmill. Pick a category below, or jump to popular products. Full board lengths live on the Decking Boards page.

Product Categories

Boards, kits, joists, blocks, screws, treatments and samples. Jump straight to the range you need.

All decking boards →All decking kits →
  • Machined at our Corby sawmill
  • Oak, Douglas fir & Thermowood
  • Free samples · £5 postage
  • UK-wide delivery

How Much Decking Do I Need?

Preview of the UK Timber decking calculator

Plan Your Deck

Enter your deck size and we'll work out boards, joists and fixings, with live prices you can add straight to your basket.

Open the decking calculator
Timber decking sample pieces in oak, Douglas fir and thermowood

Order Decking Samples

Samples are free; postage is £5 inc VAT for up to two, refunded when you buy the matching product. Oak, Douglas Fir, Ignis, Presura, Balau and Ash Thermowood.

Order samples

Popular Decking Products

Popular decking products, priced ex VAT. Kit cards show finished decks from our projects gallery.

What Our Customers Say on Google

★★★★★

I’m a diy’er and was planning a largish decking project in oak. The team at UK Timber were very helpful and patient explaining the materials and factors that were Important in my decision making. I felt comfortable making the order and everything after that was handled professionally and with courtesy. Many thanks in particular to Will.

Dads Odd jobs
★★★★★

Second time I've used these guys, once again the quality and value of the decking (European Oak) was excellent. The 4x2 was also very good. Even with the delivery charge this is so much better value than the usual suspects

John Whittle
★★★★★

Just wanted to say thank you - the beams are great, the price competitive. I really need to say thank you to the driver who was professional and very, very helpful. With 38 large beams in play he made sure everything was safe and placed them expertly and efficiently on the pavement so no pedestrian access was impacted, and so I could wheel them into the garden without a hitch - THANK YOU!

robert rocheleau

Read all reviews on Google →

Hardwood vs Softwood vs Thermowood

Choosing a decking species

European oak is a dense hardwood with a rich golden colour that weathers to silver grey. It is our premium deck board: strong, durable and a natural match for oak framing. British Douglas fir is a tough softwood with a warm pinkish grain and a lower price, which makes it a favourite for garden decks and family spaces. Thermowood is redwood that has been heat-modified in a kiln, which improves stability and gives an even, contemporary colour with less resin. Pressure-treated softwood is the practical everyday option for budget decks and utility areas.

For a classic wooden garden deck, choose oak or Douglas fir boards with matching joists and Deckin' Blocks; for a full materials list use the decking calculator.

Subframe, joists and supports

Boards are only as good as the frame under them. Use durable joists, such as our Long Life Douglas fir joists or treated softwood, set at sensible centres (often around 400 mm for 21–28 mm boards). Deckin' Blocks or properly founded posts keep the frame clear of the ground so air can circulate. Leave a small gap between boards for drainage and movement, and keep the finished deck clear of walls and soil.

Fixings

Use stainless steel or quality coated decking screws. Oak and other tannin-rich timbers can stain around ordinary steel fixings. Our Timber Titan range covers coated and stainless options sized for deck boards. Browse decking screws.

Maintenance and finishing

Hardwood and Thermowood can be left to weather, or oiled to keep the fresh colour. Treated softwood benefits from a decking stain or oil once the surface has dried. Keep leaves and debris off the boards, and recoat as the finish wears, more often on south-facing decks. See our decking treatments.

Decking FAQs

What decking supplies do you sell?

Kits, joists, Deckin' Blocks, screws and treatments, plus oak, Douglas fir, Thermowood and treated softwood boards from our sawmill. Use this page as the hub, then open the boards or kits catalogue for the full range.

Hardwood vs softwood vs Thermowood: which should I choose?

Oak is our premium hardwood for durability and appearance. Douglas fir is a strong British softwood at a lower price. Thermowood is heat-modified for stability and an even modern colour. Treated softwood suits everyday garden decks on a budget.

Timber vs composite decking: do you sell composite?

We supply timber decking today (oak, Douglas fir, Thermowood and treated softwood). We do not currently stock composite or plastic decking. Composite is a commercial decision for the business; until that changes, this page stays timber-first.

How do Deckin' Blocks work?

Deckin' Blocks are concrete supports that sit on a firm base and carry the joists, so you can build a low deck without digging post holes. See the Deckin' Blocks product page for sizes A and B.

How much decking do I need?

Use our decking calculator for a priced list of boards, joists and fixings. Allow extra for cuts and waste, usually around 10%.

What joist centres should I use?

Our decking calculator recommends joist spacing for your boards (typically 300–400 mm centres). 450 mm is wide for most boards and only suits thick, stiff boards. For a stiffer deck choose thicker boards or closer joists.

Do you deliver nationwide and can I collect?

Yes. Crane delivery typically takes up to 10 working days to most of England, and up to 15 working days for Scotland, Wales and the South West. Pallet and courier orders usually dispatch within 3–5 working days. Delivery charges are based on postcode. Collection from our Corby yard (The Gas Depot, Weldon Road, NN17 5UE) is free and usually ready within 5 working days.

Can I order decking samples?

Yes. Decking board samples are free; postage is £5 inc VAT for up to two samples, and that £5 is refunded when you buy the matching product. Ranges include Oak, Douglas Fir, Ignis, Presura, Balau and Ash Thermowood. Order decking samples.

Delivery & Collection

UK delivery

Crane delivery typically takes up to 10 working days to most of England, and up to 15 working days for Scotland, Wales and the South West. Pallet and courier orders usually dispatch within 3–5 working days. Charges are based on postcode.

Access

Dedicated crane delivery nationwide for larger loads; pallet and courier options for smaller orders. Tell us about narrow lanes or restricted access when you order.

Collection

Free collection from our Corby yard (The Gas Depot, Weldon Road, NN17 5UE). Orders are usually ready within 5 working days.