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Treated Timber

Our range of treated timber is designed for strength, durability and long-lasting protection in both indoor and outdoor construction. Ideal for everything from decking and fencing to structural work, this pressure treated timber is resistant to moisture, decay, and insect damage—making it perfect for exposed environments.

Whether you're starting a garden project or reinforcing a build, our high-quality timber ensures reliable performance year-round.

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    C16 Timber Joists UC3u Treated Kiln Dried Regularised FSC 75 x 150mm (6x3)

    C16 and C24 are strength grades; the higher the grade, the better the load bearing quality it has. C16 is normally the grade that is produced from faster grown UK timber. C24 is a premium product as the wood is slower grown and is also denser. Higher...
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    C24 Timber Joists Untreated Kiln Dried Regularised FSC 75 x 150mm (6x3)

    £20.12 - £57.85 per piece (Ex VAT)
    £24.14 - £69.42 per piece (Inc VAT)
    C16 and C24 are strength grades; the higher the grade, the better the load bearing quality it has. C16 is normally the grade that is produced from faster grown UK timber. However, this C16 timber is imported into the UK and therefore comes from is slow...
    £20.12 - £57.85 per piece (Ex VAT)
    £24.14 - £69.42 per piece (Inc VAT)
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    C24 Timber Joists UC2 Treated Kiln Dried Regularised FSC 47 x 225mm (9x2)

    £19.28 - £55.42 per piece (Ex VAT)
    £23.14 - £66.50 per piece (Inc VAT)
    C16 and C24 are strength grades; the higher the grade, the better the load bearing quality it has. C16 is normally the grade that is produced from faster grown UK timber. C24 is a premium product as the wood is slower grown and is also denser. Higher...
    £19.28 - £55.42 per piece (Ex VAT)
    £23.14 - £66.50 per piece (Inc VAT)
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    C24 Timber Joists Untreated Kiln Dried Regularised FSC 47 x 175mm (7x2)

    £13.91 - £40.00 per piece (Ex VAT)
    £16.69 - £48.00 per piece (Inc VAT)
    C16 graded carcassing is a structural timber commonly used for stud walls, roof and floor joists, and structural joinery. C16 is normally the grade that is produced from faster grown UK timber, however this timber is imported so it is slow grown. C16...
    £13.91 - £40.00 per piece (Ex VAT)
    £16.69 - £48.00 per piece (Inc VAT)
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    C24 Timber Joists Untreated Kiln Dried Regularised FSC 47 x 225mm (9x2)

    £17.89 - £51.43 per piece (Ex VAT)
    £21.47 - £61.72 per piece (Inc VAT)
    C16 graded carcassing is a structural timber commonly used for stud walls, roof and floor joists, and structural joinery. C16 is normally the grade that is produced from faster grown UK timber. However, this is imported C16 timber and therefore is slow...
    £17.89 - £51.43 per piece (Ex VAT)
    £21.47 - £61.72 per piece (Inc VAT)
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    C24 Timber Joists Untreated Kiln Dried Regularised FSC 75 x 225mm (9x3)

    £30.18 - £86.78 per piece (Ex VAT)
    £36.22 - £104.14 per piece (Inc VAT)
    C16 graded carcassing is a structural timber commonly used for stud walls, roof and floor joists, and structural joinery. C16 is normally the grade that is produced from faster grown UK timber. However, this C16 timber is imported and therefore is slow...
    £30.18 - £86.78 per piece (Ex VAT)
    £36.22 - £104.14 per piece (Inc VAT)
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    C24 Timber Joists Untreated Kiln Dried Regularised PEFC 47 x 200mm (8x2)

    £16.34 - £46.99 per piece (Ex VAT)
    £19.61 - £56.39 per piece (Inc VAT)
    PEFC certified C24 untreated kiln dried timber joist, regularised for strength and structural applications. Buy online or Click & Collect from Howarth Timber.
    £16.34 - £46.99 per piece (Ex VAT)
    £19.61 - £56.39 per piece (Inc VAT)
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    C16 Timber Joists Untreated Kiln Dried Regularised FSC 75 x 100mm (4x3)

    C16 and C24 are strength grades; the higher the grade, the better the load bearing quality it has. C16 is normally the grade that is produced from faster grown UK timber. C24 is a premium product as the wood is slower grown and is also denser. Higher...
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    C24 Timber Joists Untreated Kiln Dried Regularised FSC 75 x 200mm (8x3)

    £26.83 - £77.13 per piece (Ex VAT)
    £32.20 - £92.56 per piece (Inc VAT)
    It is machined to have rounded edges, smooth faces, and sides, for a more uniform piece of timber. It is kiln dried to minimise moisture content and improve strength and stability. The finished size you will receive is 70mm x 195mm. C16 and C24 are...
    £26.83 - £77.13 per piece (Ex VAT)
    £32.20 - £92.56 per piece (Inc VAT)
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    C16 Timber Joists Untreated Kiln Dried Regularised FSC 75 x 225mm (9x3)

    C16 and C24 are strength grades; the higher the grade, the better the load bearing quality it has. C16 is normally the grade that is produced from faster grown UK timber. C24 is a premium product as the wood is slower grown and is also denser. Higher...
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    C16 Timber Joists UC3u Treated Kiln Dried Regularised FSC 75 x 175mm (7x3)

    These C16 carcassing timber lengths are UC3u treated timber, meaning they perfect for outdoor use providing it is above ground. Carcassing is a generic trade term which refers to the use of a species of timber. Spruce/Pine and Fir are used to form...
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    C16 Timber Joists Untreated Kiln Dried Regularised FSC 72 x 195mm (8x3)

    C16 and C24 are strength grades; the higher the grade, the better the load bearing quality it has. C16 is normally the grade that is produced from faster grown UK timber. C24 is a premium product as the wood is slower grown and is also denser. Higher...
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    C24 Timber Joists Untreated Kiln Dried Regularised FSC 75 x 175mm (7x3)

    £23.48 - £67.49 per piece (Ex VAT)
    £28.18 - £80.99 per piece (Inc VAT)
    It is machined to have rounded edges, smooth faces, and sides, for a more uniform piece of timber. It is kiln dried to minimise moisture content and improve strength and stability. The finished size you will receive is 70mm x 170mm. C16 and C24 are...
    £23.48 - £67.49 per piece (Ex VAT)
    £28.18 - £80.99 per piece (Inc VAT)
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    C16 Timber Joists UC3u Treated Kiln Dried Regularised FSC 75 x 200mm (8x3)

    These C16 carcassing timber lengths are UC3u treated timber, meaning they perfect for outdoor use providing it is above ground. Carcassing is a generic trade term which refers to the use of a species of timber. Spruce/Pine and Fir are used to form...
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    C16 Timber Joists UC3u Treated Kiln Dried Regularised FSC 75 x 225mm (9x3)

    These C16 carcassing timber lengths are UC3u treated timber, meaning they perfect for outdoor use providing it is above ground. Carcassing is a generic trade term which refers to the use of a species of timber. Spruce/Pine and Fir are used to form...
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    C24 Timber Joists Untreated Kiln Dried Regularised PEFC 75 x 175mm (7x3)

    Kiln dried C24 untreated timber joist, regularised and PEFC certified for structural building applications. Buy online or Click & Collect today.
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    C24 Timber Joists Untreated Kiln Dried Regularised PEFC Premium Length 75 x 175mm (7x3)

    Premium length C24 untreated timber joist, kiln dried and regularised for structural timber projects. Buy online with delivery or Click & Collect.
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    Larch Rebated Timber Cladding 25 x 100mm (87mm Face) (Finished Size 20x94mm)

    £8.23 - £23.67 per piece (Ex VAT)
    £9.88 - £28.40 per piece (Inc VAT)
    Rebated larch timber cladding with an 87mm face for durable, natural exterior façades and garden buildings. Buy online with delivery or Click & Collect today.
    £8.23 - £23.67 per piece (Ex VAT)
    £9.88 - £28.40 per piece (Inc VAT)
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    Rough Sawn Timber UC2 Treated Green Kiln Dried PEFC 22 x 100mm (4x1)

    UC2 treated rough sawn timber, kiln dried and PEFC certified for fencing, framing and general construction projects. Buy online or Click & Collect today.

Our range of treated timber is designed for durability and weather resistance. Perfect for both indoor and outdoor projects, it offers strength you can rely on. Every length is pressure treated timber to protect against rot, decay, and insects.

Whether you need small sections or heavy-duty sizes, we’ve got it covered. Popular options include:

  • 4x2 treated timber – ideal for framing and structural work.
  • 3x2 treated timber – great for smaller stud walls and internal jobs.
  • 6x2 treated timber – perfect for joists and heavy load projects.
  • 2x2 treated timber – a handy choice for battening or light frames.
  • 4x2 timber treated – a versatile option for many DIY tasks.

All pieces are manufactured to high standards, ensuring long-lasting performance for construction and garden projects.

Why choose pressure treated timber?

Pressure treated timber is timber that has been infused with preservatives under high pressure. This process helps the wood resist moisture and pests, giving you peace of mind for years. It’s the smart choice for outdoor structures like decking, sheds, or fencing.

Can you paint treated timber?

Yes, you can. Many customers ask, “can you paint treated timber?” The answer is simple – once the wood is fully dry, you can paint or stain it to suit your style. This adds another layer of protection while improving the look of your project.

Explore our full range of treated timber in different sizes to suit every job. With quality, durability, and affordability combined, our timber is built to last.