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Treated pine timber sleepers (200×75mm, H4 CCA, in-ground rated) are a budget-friendly, natural-timber option for garden retaining walls and edging up to about 1.0m in well-drained ground. Available 1800, 2400 and 3000mm. Delivered Australia-wide by Retaining Walls Direct.
Written and product-checked by the Retaining Walls Direct team — supplying retaining wall materials across Australia. Last updated: June 2026.
H4 CCA treatment (copper-chrome-arsenate) makes these pine sleepers suitable for in-ground contact, resisting decay and termites better than untreated timber. They're the economical, warm-timber choice for low garden walls, raised beds and edging.
| Material | Treated pine, H4 CCA (in-ground rated) |
|---|---|
| Profile | 200mm × 75mm |
| Lengths | 1800 · 2400 · 3000mm |
| Wall height | Up to ~1.0m in well-drained ground (confirm by site/engineering) |
| Brand | Retaining Walls Direct |
Timber is cheaper upfront, lighter to handle and gives a natural look, but it has a shorter life in ground contact and can eventually rot, split or move. For a low garden wall on a budget, treated pine is a solid choice. For a permanent wall, a taller wall, or one near driveways and structures, our concrete sleepers last far longer with no maintenance — compare the options before you decide.
Low timber walls are typically built with timber or galvanised steel posts set in concrete, with drainage behind the wall — see how to build a retaining wall and the drainage guide. Walls over 1.0m or near boundaries/driveways generally need engineering and council approval (engineered walls over 1 metre).
Send your postcode and quantities for a freight quote, or contact the team.
What does H4 mean?
H4 CCA treatment rates the timber for in-ground contact, resisting decay and termites — suitable for retaining wall use.
How high a wall can I build?
Up to about 1.0m in well-drained ground; taller walls need engineering (and we'd suggest concrete).
What sizes?
200×75mm, in 1800/2400/3000mm.
Should I use timber or concrete?
Timber is cheaper and natural; concrete lasts far longer with no maintenance — see the comparison above.
Can you deliver to me?
We deliver across most of Australia. Send your postcode and quantities for a freight estimate.
