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Decking Boards

Timber deck boards available in popular sizes including 2.4m deck boards, 3m decking boards, 3.6m decking boards, 4m decking boards, and 4.8m decking boards, giving you flexibility when designing your deck layout.

Our deck boards are pressure-treated for durability and resistance against the elements, making them ideal for year-round outdoor use.

Not sure how many boards you’ll need? Use our handy decking calculator to plan your project and order with confidence.

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    ArborDeck Timber Decking & Rail UC3u Treated Contemporary 4 Smooth 38 x 100 x 3600mm

    Top selling high-quality imported softwood timber is created from slow-grown premium redwood. Timber allows you to create beautiful decking that may be used to expand your home into your garden or provide a relaxing escape. For a longer life and to...
  • 33IC3143636-01.jpg.jpeg

    ArborDeck Timber Decking & Rail UC3u Treated Contemporary 6 Smooth 38 x 150 x 3600mm

    This product can be used as both a rail or a deck board. Manufactured from high quality imported softwood, high pressure green treatment providing longer life. All sizes are nominal. Take 5mm off edges for true size. Please note: Timber decking boards...
  • 33IC3143636-01.jpg.jpeg

    ArborDeck Timber Decking & Rail UC3u Treated Contemporary 6 Smooth 38 x 150 x 4800mm

    This product can be used as both a rail or a deck board. Manufactured from high quality imported softwood, high pressure green treatment providing longer life. All sizes are nominal. Take 5mm off edges for true size. Please note: Timber decking boards...

Treated Timber Decking

What to Consider When Buying Decking Boards

When choosing your wood decking boards, keep these points in mind:

  • Board size – Match the length of your boards to your deck layout. This helps reduce waste and joints.
  • Timber type – Think about style, durability, and whether the wood is treated for outdoor use.
  • Surface finish – Grooved boards improve grip and water drainage. Smooth boards give a sleek, modern look.
  • Maintenance – Timber decking may need staining or oiling to stay looking its best.

Not sure how many boards you need? Use our Decking Board Calculator and our friendly teams will be happy to help.

to plan your project and order with confidence.

Whether you're a trade professional or a DIYer, our team can help you choose the perfect solution. Many of our branches offer a timber cutting service, so you get the exact sizes you need.

Using a CAMO Marksman Edge allows you to insert hidden deck fasteners into the edge of the board, creating a neat finish without gaps. This tool works with any size of decking.

For exceptionally wide boards, the CAMO Wide Board Marksman Pro is a better choice because it includes a spacer for guidance.

Where to Use Timber Decking Boards

Decking boards are perfect for covering damaged concrete. They make outdoor areas look clean and inviting.

If your garden is boggy or damp, decking helps lift the space above wet ground, making it usable all year. It also works for sloped or uneven gardens, creating a level area for tables and chairs.

Grooved boards are ideal near pools or water features because the grooves help water run off quickly. For longer decking lengths, choose smooth boards instead for better performance.

At Howarth Timber & Building Supplies, we stock a wide range of decking boards, plus C16 and C24 timbers for your framework. We also offer composite decking and everything you need in our Garden & Landscaping range to complete your outdoor project.

Frequently Asked Questions

How much are decking boards?
A garden deck project will typically cost between £1,000 and £2,000. The cost will vary depending on the type of materials you select, the size of the decking and the location. The four most popular decking boards include softwood, hardwood, composite and antislip timber.
How wide are decking boards?
The most common decking widths are 90mm to 150mm, with 120mm and 140mm in between. The width option you choose for your project can make a big impact in the ultimate effect, so get creative to achieve the best look for your decking while staying within your budget.
How long does deck last?
You can anticipate your timber decking to last at least 15 years and up to 30 years if you use suitable materials and follow installation and maintenance guidance. When it comes to decking maintenance, the most important things to remember are to use properly treated deck boards, use appropriate deck fasteners, and keep your deck clean. Install your timer deck appropriately and it will last a long time.
What gap should you leave between decking boards?
Leave 5mm gaps between deck planks while installing them. A gap at the end of the boards must be considered, the recommended gap is around 4.5mm to 6mm. This gap will allow the deck to breathe, provide drainage, and make cleaning easier. You must leave gaps between your deck boards so they can compress and expand. They can cause friction if they are too close to each other, which can harm the boards. It can also cause the boards to bend, cup, or warp. Leaving spaces between the gaps can help with drainage, reducing the likelihood of water gathering on your patio. You may also limit the risk of moisture damage, mould, and mildew growth by having good drainage.
What is the difference between Hardwood and Softwood?
Hardwoods are so-called, as they are sourced from trees that grow slowly, meaning the wood has more time to mature. In comparison, Softwoods are sourced from fast-growing trees, but this doesn’t mean softwoods can’t be tough too. Hardwood decking is often a popular choice because hardwoods are typically more resilient against rot and degeneration. However, softwood decking boards are also a great choice with a little extra maintenance.
Difference Between Smooth and Grooved Deck Boards
A lot of companies will tell you that Grooved Deck Boards are the better option because they offer more slip resistance. However, this is untrue: Grooved Boards offer no advantage – in terms of slippage – over Smooth ones.
How many decking boards do I need?
To begin, calculate the area of your decking in square metres. This is quite straightforward if your decking is square or rectangular. Simply double the length and width of your planned decking space by two. Then put the area of all of these together to get your total. After that, measure the width of the decking boards you intend to use. It's a good idea to add roughly 5mm to the board width to account for the minor gaps between each decking board. Then, take this measurement and divide it by the length of the decking planks you intend to buy. You now know how many decking boards you’ll need.
What direction do you lay decking boards?
You need to lay decking boards in a diagonal direction, as this gives them a very noticeable look.

How to guides

Garden decking ideas

Looking for inspiration? Discover how to build a deck that perfectly suits you with so many options to suit outdoor spaces of any size and shape. 

How to build a deck

A step by step guide on how to build a deck.

Customer inspiration

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