Slopes change how councils measure fence height, and a retaining wall under the fence counts towards it. What Brisbane and the Gold Coast say.
A sloping block changes two things about a fence: how it sits on the ground, and how the council counts its height. Once there's a retaining wall under or beside the fence, there's a third thing, because the wall has its own rules. Here's how those pieces fit together, using what Brisbane and Gold Coast councils say on their websites (read in October 2026).
One thing first. We make and install precast concrete fences. Retaining walls aren't something we supply, and our fence panels aren't a substitute for one. If your block needs ground held back, that's a separate job with its own approval question.
How a fence follows a slope
Our panels step with the terrain. On our fence installation page we say the system handles slopes this way.
We're also upfront about the cost side. Our precast concrete walls page notes that sloping or uneven blocks can need extra footing work compared with a flat site. A customer review from May 2025 on our reviews page describes the crew "negotiating our steep sloping block".
Why slope changes the paperwork
Both councils measure from the ground, and each uses its own words. Brisbane says natural ground surface. The Gold Coast says original ground level.
On a steep block the ground under your fence line isn't one height, so the measurement isn't one number. If the yard has also been cut or filled, the natural or original level can differ from the finished level you see now. That's worth raising with your certifier before you settle the fence height. For the basic thresholds see our post on council approval for a concrete fence.
When a retaining wall changes the rules
This is where slopes catch people out. Brisbane's fencing page says fence height includes a combination of screens, fences and retaining walls. So the wall counts towards the 2 metre building approval line, not just the fence.
Both councils also set conditions for a retaining wall to avoid building approval at all. Here's what each says:
- Brisbane: no surcharge loading over the wall's zone of influence, a total height of wall plus retained fill or cut of no more than 1 metre above natural ground surface, no closer than 1.5 metres to a building or another retaining wall, and not part of pool fencing. Council also says flood overlay and landslide overlay codes may require planning approval.
- Gold Coast: less than 1.0 metre high, further than 1.5 metres from a building or another retaining wall, supporting only the soil behind it and nothing above, combined wall and fence height under 2.0 metres, not over a sewer or stormwater service, not in an easement or covenant area, and not in a waterfront or oceanfront setback area.
Look at the phrases "surcharge loading" and "nothing above". A fence on top of a retaining wall is exactly the case those words raise. Whether it counts is a question for your private building certifier, and we can't answer it from a quote.
What to do first
A sensible order for a sloping block with a wall:
- Sort out the retaining wall and its approval first, so the fence goes onto ground that's settled.
- Ask your certifier how the combined height is measured at the highest point of the fence line.
- Then talk to us about the fence.
When you do, send photos of the high and low ends of the fence line and tell us the height of any wall. We measure most fence lines remotely from satellite imagery and Street View and sometimes ask for a marked-up photo, so a couple of clear shots of the slope save a lot of back and forth.
Common questions
Can a concrete fence panel act as a retaining wall?
A fence panel is there to enclose, not to hold soil back. If your ground needs holding back, treat that as its own job and get it designed and approved as one.
Does a retaining wall plus a fence count towards the 2 metre height?
In Brisbane, yes: Council says fence height includes a combination of screens, fences and retaining walls. On the Gold Coast, one of the conditions for a retaining wall to skip building approval is that the combined wall and fence height is under 2.0 metres.
Does a sloping block cost more to fence?
It can. Slopes can need extra footing work compared with a flat site. We quote on the measured fence line, so send us the details.
Who decides whether my wall and fence need approval?
Your council or a private building certifier. The Gold Coast notes a designer, engineer or private building certifier may be able to help if you're unsure.
Getting the fence line right
Read the source pages: Brisbane City Council on retaining walls and Gold Coast City Council on retaining walls. Then get in touch or call 1800 092 557 and we'll go through your fence line with you.
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