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Timber Decking Joists | Treated Joists for Garden Decking Frames

Shop our range of pressure-treated timber decking joists, ideal for building strong and long-lasting decking subframes. Designed to support softwood and composite decking boards, these structural timbers are treated for outdoor durability and ground contact.

✅ UC3-treated for exterior use
✅ Available in popular sizes: 47x100mm, 47x150mm, 47x200mm
✅ Ideal for ground-level and raised decking projects
✅ Compatible with all major decking board types
✅ Strong, stable, and easy to install

Perfect for garden decking frames, outdoor platforms, and step construction. Trusted by landscapers, joiners, and home DIYers across the UK. Nationwide delivery available on all decking joists and framing

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100mm x 47mm (4"x2") joist, square sawn

£10.70 - £14.28
£10.70 - £14.28
£10.70
£8.64 - £11.52
£8.64 - £11.52
£8.64
In stock

100mm x 47mm (4"x2") Joist, Square Sawn Enhance your construction projects with our durable 100mm x 47mm joists, available in various lengths ...

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£10.70 - £14.28
£10.70 - £14.28
£10.70
£8.64 - £11.52
£8.64 - £11.52
£8.64
Save up to 19% Save %
Save up to 68% Save %

75 x 47mm (3x2) Treated Timber | C16 / C24 Regularised Carcassing

£10.74
£10.74 - £10.74
£10.74
£3.48 - £9.99
£3.48 - £9.99
£3.48
In stock

Our 75 x 47mm (3x2) regularised treated timber is a versatile and reliable structural softwood, ideal for a wide range of internal and external app...

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£10.74
£10.74 - £10.74
£10.74
£3.48 - £9.99
£3.48 - £9.99
£3.48
Save up to 68% Save %
Save up to 57% Save %

125 x 47mm (5x2) Treated Timber Joist | C16 / C24 Regularised

£17.90
£17.90 - £17.90
£17.90
£7.62 - £13.70
£7.62 - £13.70
£7.62
In stock

Our 125 x 47mm (5x2) treated timber joists are strong, reliable, and versatile — ideal for structural applications including decking frames, floor ...

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£17.90
£17.90 - £17.90
£17.90
£7.62 - £13.70
£7.62 - £13.70
£7.62
Save up to 57% Save %
Save up to 23% Save %

150mm x 47mm (6"x2") Joist, square sawn

£16.07
£16.07 - £16.48
£16.07
£12.36 - £16.48
£12.36 - £16.48
£12.36
In stock

150mm x 47mm (6"x2") Joist, square sawn Enhance your construction projects with our 150mm x 47mm (6"x2") Joist, pressure treated in an att...

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£16.07
£16.07 - £16.48
£16.07
£12.36 - £16.48
£12.36 - £16.48
£12.36
Save up to 23% Save %

100 x 47mm (4x2) Treated Timber | C16 / C24 Regularised Carcassing

£4.80 - £10.96
£4.80 - £10.96
£4.80 - £10.96
£4.80
In stock

Our 100 x 47mm (4x2) regularised treated timber is a high-quality structural softwood suitable for a wide range of building applications. Supplied ...

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£4.80 - £10.96
£4.80 - £10.96
£4.80 - £10.96
£4.80
Sold out

4.8m x 50 x 47mm (2X2) Treated Timber Joist | C16 Grade Regularised

£5.40 - £5.40
£5.40
£5.40 - £5.40
£5.40
Out of stock

Our 4.8 metre x 50 x 47mm treated timber joist is a heavy-duty, regularised carcassing timber, ideal for structural and load-bearing applications. ...

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£5.40 - £5.40
£5.40
£5.40 - £5.40
£5.40
Sold out

4.8m x 175 x 47mm (7X2) Treated Timber Joist | C24 Grade Regularised

£17.90 - £17.90
£17.90
£17.90 - £17.90
£17.90
In stock

Our 4.8 metre x 175 x 47mm treated timber joist is a heavy-duty, regularised carcassing timber, ideal for structural and load-bearing applications....

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£17.90 - £17.90
£17.90
£17.90 - £17.90
£17.90

4.8m x 200 x 47mm (8X2) Treated Timber Joist | C16 / C24 Grade Regularised

£16.80 - £21.92
£16.80 - £21.92
£16.80 - £21.92
£16.80
In stock

Our 4.8 metre x 200 x 47mm treated timber joist is a heavy-duty, regularised carcassing timber, ideal for structural and load-bearing applications....

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£16.80 - £21.92
£16.80 - £21.92
£16.80 - £21.92
£16.80

4.8m x 100 x 75mm Treated Timber Post (4x3) | C16 Regularised – Clearance Stock

£25.00 - £25.00
£25.00
£25.00 - £25.00
£25.00
In stock

This 4.8 metre x 100 x 75mm (4x3 inch) regularised treated timber post is ideal for a wide range of structural and outdoor applications such as fen...

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£25.00 - £25.00
£25.00
£25.00 - £25.00
£25.00

4.8m x 250 x 47mm (10X2) Treated Timber Joist | C16 Grade Regularised

£19.99 - £19.99
£19.99
£19.99 - £19.99
£19.99
In stock

Our 4.8 metre x 250 x 47mm treated timber joist is a heavy-duty, regularised carcassing timber, ideal for structural and load-bearing applications....

View full details
£19.99 - £19.99
£19.99
£19.99 - £19.99
£19.99

150 x 47mm (6x2) Treated Timber | C16 / C24 Regularised Carcassing

£10.38 - £21.42
£10.38 - £21.42
£10.38 - £21.42
£10.38
In stock

Our 150 x 47mm (6x2) treated timber is a high-quality, regularised carcassing timber suitable for a wide range of structural and framing applicatio...

View full details
£10.38 - £21.42
£10.38 - £21.42
£10.38 - £21.42
£10.38