The short answer
On a slope, you either 'step' rigid panels down the gradient or 'rake' a fence to follow the ground. Stepping keeps each panel level and drops it down at each post, leaving triangular gaps at the base that are filled with gravel boards — the easiest method for standard rigid panels and concrete-post systems. Raking angles the boards to follow the slope so the top line runs parallel to the ground with no gaps; this suits built-on-site closeboard or made-to-measure panels and gives a neater finish on a steady gradient. Closeboard and slatted fences rake most easily, while standard panels are usually stepped. Strong posts and gravel boards matter on any slope.
A sloping boundary is one of the trickier fencing jobs, because standard panels are made to sit level. The two established solutions — stepping and raking — each suit different fences and different slopes.
Fencing a slope
- SteppingLevel panels drop at each post; gaps filled
- RakingBoards angled to follow the slope; no gaps
- Best for steppingStandard rigid/concrete-post panels
- Best for rakingCloseboard, slatted, made-to-measure
- Always useGravel boards + strong posts
Stepping a fence down a slope
Stepping is the most common method for ordinary garden panels. Each rigid panel is kept level, and at every post the next panel is dropped down a step to follow the fall of the ground. The result is a fence with a staircase-like top line — level sections that each sit lower than the last.
Because each panel sits level but the ground slopes beneath it, stepping leaves a triangular gap under the lower edge of each panel. These gaps are filled with gravel boards — often deeper or stacked gravel boards on the steeper side — which also keep the panel off the ground. Stepping is the natural choice for standard rigid panels and slotted concrete-post systems, which cannot be angled. It is straightforward to build, but the stepped top line is more noticeable on steeper slopes.
Raking a fence to follow the slope
Raking means angling the fence so it follows the gradient, with the top of the fence running roughly parallel to the sloping ground and no triangular gaps at the base. To do this, the individual boards are set at an angle, or the panel is made to a raked shape, so the whole fence leans with the slope.
Raking gives a much neater, continuous finish on a steady slope — there is no staircase effect and no gap to fill. It works best with fences built on site, such as closeboard (feather-edge), where each board is fixed individually and can be cut to the rake, and with slatted or made-to-measure panels designed for the angle. It is more work and skill than stepping, and it is less suited to uneven or changing gradients, where the angle would need to keep shifting.
| Method | Best for | Finish |
|---|---|---|
| Stepping | Standard rigid / concrete-post panels | Stepped top line, gaps filled with gravel boards |
| Raking | Closeboard, slatted, made-to-measure | Follows slope, no gaps, neater |
| Stepping — steep slope | Easy to build | Steps more obvious |
| Raking — steady slope | Continuous, tidy | Needs even gradient |
Indicative guide to fencing a UK sloping garden; the right method depends on the fence type and how steep and even the slope is.
Materials, posts and gravel boards on a slope
The fence type strongly influences which method you can use:
- Closeboard (feather-edge): built on site board by board, so it rakes neatly and is the best timber choice for following a slope. It can also be stepped.
- Standard lap / overlap / composite panels: rigid and made level, so they are nearly always stepped, with gravel boards filling the gaps.
- Slatted / hit-and-miss: can be raked or stepped, and the open structure can hide minor level changes.
- Concrete-post systems: panels drop into the slots at each post, so stepping is the natural approach; the gravel board at the base takes up the level difference.
On any slope, two things are essential. Gravel boards keep the panel off the ground and fill the gaps left by stepping — and you may need deeper boards on the lower side. Strong, well-set posts matter even more on a slope, because uneven ground and any extra leverage make a weak post more likely to fail. Concrete posts set firmly in concrete are the dependable choice.
Drainage, the gap at the bottom, and a slope that runs across the fence
A slope changes more than the top line of the fence — it changes how water moves around it, and that has real consequences for how long the fence lasts. On sloping ground, rainwater runs downhill along the fence line and tends to collect at the lowest posts and against the bottom of the lower panels, which is exactly where timber rots first. This is why gravel boards earn their place doubly on a slope: they hold the panel clear of ground that is wetter than on the flat, and the lower bays in particular benefit from a deeper or stacked board. Leaving a small drainage gap beneath the boards, or bedding posts on a little gravel, helps water drain away rather than pool against the timber.
The triangular gap left by stepping is worth thinking about beyond just filling it. Left open, it lets pets and wildlife under the fence and undermines privacy and security at the base; closed with a gravel board it solves all three. On a steeper slope the steps are larger, so the gravel boards must be sized to suit each bay rather than using one standard board throughout.
One slope type deserves special mention: a garden that falls across the run rather than smoothly along it, or that changes direction partway, makes raking impractical because the angle would keep shifting. Here stepping with adjustable gravel boards is almost always the realistic answer, and built-on-site closeboard gives the most freedom to take up awkward, changing levels board by board. In short, the steeper, wetter and more uneven the ground, the more the base detail — gravel boards, drainage and firmly concreted posts — decides whether the fence survives, not the choice between stepping and raking alone.
Choosing the right approach for your slope
Match the method to the slope and the fence you want:
- Choose stepping if you are using standard rigid or concrete-post panels, the slope is steep, the gradient changes along the run, or you want the simpler, more forgiving build — and you are happy with a stepped top line.
- Choose raking if the slope is steady and even, you want a continuous, gap-free finish, and you are using closeboard built on site or made-to-measure raked panels.
For most sloping UK gardens with standard panels, stepping is the practical and economical answer, with gravel boards neatly closing the gaps. Where appearance matters and the gradient is consistent, a raked closeboard fence gives a cleaner line worth the extra effort. Whichever you choose, robust posts set in concrete and good gravel boards are what make a sloping fence durable, because the slope itself adds stress that a weak base would not survive.
Frequently asked questions
Should I step or rake a fence on a slope?
Step rigid panels — keep each one level and drop it down at each post, filling the triangular gaps with gravel boards. Rake fences built on site, like closeboard, by angling the boards to follow a steady slope for a neater, gap-free finish. Steep or uneven slopes usually suit stepping; consistent slopes suit raking.
What fills the gap under a stepped fence panel?
Gravel boards. Because each stepped panel sits level over sloping ground, a triangular gap is left at the lower edge. A gravel board — sometimes deeper or stacked on the steeper side — fills that gap and keeps the panel off the wet ground, protecting it from rot.
Which fence type is best for a sloping garden?
Closeboard (feather-edge) is the most flexible because it is built board by board on site, so it rakes neatly to follow a slope. Standard rigid panels are usually stepped. Slatted fences can be raked or stepped and can hide minor level changes. Strong posts and gravel boards matter on any slope.
Sources & further reading
Figures on this page are typical UK ranges drawn from published sources and depend on your specific garden. They are guidance, not a quotation.