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Fence Rails & Joists | Treated Timber for Fencing Support

Browse our range of fence rails and timber joists designed for supporting fencing panels, feather edge boards, and closeboard systems. All timber is pressure-treated for outdoor use, providing strength and durability in all weather conditions.

✅ Arris rails, cant rails & square fencing rails
✅ UC3 & UC4 treated timber for above and in-ground use
✅ Available in a variety of lengths and profiles
✅ Ideal for closeboard fencing, post and rail systems & agricultural fencing
✅ Strong, stable, and easy to fix to timber or concrete posts

Our fencing rails and joists are perfect for creating rigid, professional-grade fence structures, trusted by landscapers, fencing contractors, and homeowners alike. Nationwide delivery available.

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4.8m & 3.6m x 75mm x 38mm (3"x 1.5") Standard fence rail

Alter Supplies
Original price £5.99 - Original price £8.14
Original price £5.99 - Original price £8.14
Original price £5.99
£4.80 - £6.41
£4.80 - £6.41
Current price £4.80
In stock

75mm x 38mm standard fence rails @ Various lengths, pressure treated green, Square sawn. Used for the construction of slatted fencing. 3.6m, 4.8m l...

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Original price £5.99 - Original price £8.14
Original price £5.99 - Original price £8.14
Original price £5.99
£4.80 - £6.41
£4.80 - £6.41
Current price £4.80
Save up to 21% Save %

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

Alter Supplies
Original price £10.70 - Original price £14.28
Original price £10.70 - Original price £14.28
Original price £10.70
£8.64 - £11.52
£8.64 - £11.52
Current price £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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Original price £10.70 - Original price £14.28
Original price £10.70 - Original price £14.28
Original price £10.70
£8.64 - £11.52
£8.64 - £11.52
Current price £8.64
Save up to 19% Save %

4.8M x 50 X 47 (16ft x 2 x 2) Sqaure Joist

Alter Supplies
Original price £7.15
Original price £7.15 - Original price £7.15
Original price £7.15
Current price £5.76
£5.76 - £5.76
Current price £5.76
In stock

4.8M x 50 X 47 (16ft x 2 x 2) Sqaure Joist Discover the perfect solution for your rail joist needs with our 4.8M x 50 X 47 (16ft x 2 x 2) Square J...

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Original price £7.15
Original price £7.15 - Original price £7.15
Original price £7.15
Current price £5.76
£5.76 - £5.76
Current price £5.76
Save 19% Save %

88mm x 38mm (3.5"x3/4") fence rail, square sawn -HCD

Alter Supplies
Original price £7.15 - Original price £9.90
Original price
£7.15 - £9.90
£7.15 - £9.90
Current price £7.15
In stock

88mm x 38mm fence rails @ Various lengths, pressure treated green, Square sawn. Used for the construction of slatted fencing, horse arenas and timb...

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Original price £7.15 - Original price £9.90
Original price
£7.15 - £9.90
£7.15 - £9.90
Current price £7.15

100mm x 38mm (4"x3/4") Heavy duty fence rail, square sawn

Alter Supplies
Original price £9.49
Original price £9.49 - Original price £9.49
Original price £9.49
Current price £7.47
£7.47 - £7.47
Current price £7.47
In stock

100mm x 38mm (4"x3/4") Heavy Duty Fence Rail, Square Sawn Enhance the durability and strength of your fences with our 100mm x 38mm heavy d...

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Original price £9.49
Original price £9.49 - Original price £9.49
Original price £9.49
Current price £7.47
£7.47 - £7.47
Current price £7.47
Save 21% Save %

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

Alter Supplies
Original price £16.07
Original price £16.07 - Original price £16.48
Original price £16.07
£12.36 - £16.48
£12.36 - £16.48
Current price £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...

View full details
Original price £16.07
Original price £16.07 - Original price £16.48
Original price £16.07
£12.36 - £16.48
£12.36 - £16.48
Current price £12.36
Save up to 23% Save %

3.6m x 100mm half round rails

Alter Supplies
Original price £9.90 - Original price £9.90
Original price
£9.90
£9.90 - £9.90
Current price £9.90
In stock

Crafted to industry standards, these 3.6m x 100mm half round treated fence rails are expertly machined for superior durability and strength. Perfec...

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Original price £9.90 - Original price £9.90
Original price
£9.90
£9.90 - £9.90
Current price £9.90