Sloped Garden Solutions: Terracing with Modular Steel Raised Beds

The most cost-effective way to make a sloping garden usable is stepped terracing with modular raised bed sections: a series of level beds that follow the slope in steps, each panel retaining 200–600mm of soil — far cheaper and faster than masonry retaining walls, and reconfigurable if your needs change. Here's how to plan it.

Why slopes waste gardens

A slope over about 1-in-10 is hard to mow, awkward to plant, and sheds water (and nutrients) downhill before plants use them. Terracing converts one unusable slope into several level, plantable, sittable spaces — it's the highest-value transformation in garden design.

Planning your terraces

1. Measure the fall. A straight plank, a spirit level and a tape: measure how much the ground drops over each metre of run.
2. Divide into steps. Each 400mm of total fall suits one terrace step using 400mm-high panels; a garden falling 1.2m works as three 400mm steps.
3. Run beds across the slope, never down it — each bed's uphill panel retains soil, the downhill face stands proud as a raised bed edge.
4. Start at the bottom and work up, so each terrace's base is level before the next is set.

Why modular steel suits slopes

The CortenGrid straight sections (200–600mm heights) and corner sections bolt into any stepped configuration, follow awkward plot shapes, and — unlike timber — won't rot at the soil face they're permanently retaining. Planning method is covered in our modular layout guide.

Know your limits

Modular beds retain soil, not structures. For falls over about 600mm in a single step, near buildings, or where a slope shows signs of movement, involve a landscaper or structural engineer — serious retaining walls are engineered structures with drainage designed in.

Frequently asked questions

Do terraced beds need drainage?

Open-bottomed modular beds drain into the ground naturally — add a gravel backfill line along the uphill face on heavy clay.

Can I terrace a slope gradually over several seasons?

Yes — that's a key modular advantage: build the bottom terrace this year, add the next as budget allows.

What do I plant on terraces?

Anything — that's the point. Vegetables on the sunny steps (see our vegetable guide), ornamentals elsewhere.

How does cost compare to a retaining wall?

Steel terracing typically comes in at a fraction of masonry cost — no footings, no bricklayer, no waiting for trades.

Level up (literally)

Plan your terraces with CortenGrid modular sections, made in Britain from £70 per panel.