How much does a pool retaining wall cost?

What is a retaining wall for a pool?

A retaining wall holds back soil where the ground level changes. Around a pool there are two kinds, and they are priced differently:

• Landscape retaining walls hold the cut on the high side of the pool and the fill under the paving on the low side. These are the walls priced on this page, usually by a landscaper or the pool builder's subcontractor.
• The pool wall itself, where a concrete shell holds soil on one side and water on the other. That is engineered as part of the pool and priced in the pool contract; building a pool on a sloping block covers it, with the cost of the slope as a whole.

The height that matters is the height of ground the wall retains, not the height of the blocks you can see. And a wall next to the pool barrier changes the barrier: the fence height is measured from the finished ground, and steps or walls near it can become footholds. The 500mm setback around a pool fence explains the rule.

The quotable version: a pool retaining wall is priced per square metre of face, length × retained height, and the retained height also decides whether it needs approval.

Pool retaining wall cost per square metre, worked for a 10 metre wall

No regulator publishes retaining wall prices. Two lead-generation cost guides do, both updated in 2026, and they disagree at the top end:

At 1m high a lineal metre is a square metre of face, so the two columns are comparable for a 1m wall. Guide A adds drainage behind the wall at $30–$80 a lineal metre and engineering at $500–$2,000 a job, and prices a concrete sleeper wall 1.5m high at $400–$950 a lineal metre.

Worked example. A 10m wall on the low side of a pool, retaining 0.9m, is 9 m² of face. In concrete sleepers: 9 × $250–$400 = $2,250–$3,600 on guide B; guide A's 1m rate gives $3,000–$6,000, which overstates a 0.9m wall. Drainage adds 10 × $30–$80 = $300–$800. Total about $2,550 on the cheapest reading to $8,800 on the dearest with $2,000 of engineering. Raise the same wall to 1.5m and guide A's rate becomes $4,000–$9,500 before drainage, and the wall crosses the approval line in every state in the table.

Element rates for paving and turf around the same pool are on what landscaping around a pool costs. The quotable version: a 0.9m concrete sleeper wall 10m long costs about $2,550–$8,800 with drainage on 2026 cost-guide rates, and height pushes both the rate and the approvals.

Do I need approval for a retaining wall around my pool?

Read the table above by the retained height, then by the condition that most often catches a pool wall: whether it is associated with other building work.

• NSW: a retaining wall is exempt development only up to 600mm and at least 1m from each boundary and 2m from another retaining wall, with drainage connected to the site's stormwater. A pool approved as complying development needs any earthworks over 600mm supported by a wall a professional engineer has certified.
• Queensland: accepted development up to 1m including the retained cut or fill, with no surcharge load and 1.5m clear of a building or another wall. A full pool behind a wall is a load; ask the certifier. A wall that forms part of the fencing for a regulated pool is excluded from the exemption.
• Victoria: under 1m is exempt unless associated with other building work, so a wall built as part of a pool is normally on the pool's building permit.
• WA: a building permit is needed for a wall retaining more than 0.5m. Councils describe the further conditions differently, so ask yours; one says every retaining wall in its area must be designed by a structural engineer.
• SA: development approval is usually not needed up to a 1m difference in ground level, measured across all tiers, but a pool fence on top of a wall needs approval if the two together exceed 2.1m from the low side.
• Tasmania: low-risk work up to 0.5m within 1.5m of a boundary and 1.2m elsewhere, not associated with work needing a permit; up to 1.8m if engineer-designed and built by a licensed builder.

For the pool's own approval route, see do I need council approval for a pool. The quotable version: WA's line is 0.5m, NSW's 600mm, and Queensland's, Victoria's and SA's 1m, but a wall built as part of a pool often falls under the pool's approval whatever its height.

What to ask for in a pool retaining wall quote

• Length and retained height of every wall, so you can check the m² of face and see which approval line each wall crosses.
• Drainage behind the wall: agricultural pipe, aggregate, fabric and where it discharges. Cost guide A prices it at $30–$80 a metre; walls that fail usually fail on drainage, both guides say.
• Engineering, and whether the design allows for the pool's water load and any fence on top.
• Who lodges the approval, and whether the wall is on the pool's approval or its own.
• Spoil: the cut has to go somewhere; pool excavation cost covers disposal.

The soil behind the wall decides the footing, so if you have not had a soil test, do I need a soil test before building a pool explains what it tells the engineer. Then compare pool quotes with the walls priced as separate lines; listed businesses cover Brisbane, Sydney, Melbourne and Perth.

Common questions

Sources

• State Environmental Planning Policy (Exempt and Complying Development Codes) 2008, cl 2.30 and the complying development earthworks clauses (read via Internet Archive capture of 9 August 2025; the live site blocks this host)
• Queensland Building Regulation 2021, schedule 1, section 3: work for particular retaining walls
• Victorian Building Authority: When is a building permit required? (December 2023; read via Internet Archive)
• City of Fremantle: fences and retaining walls, building permit and engineering requirements
• Shire of Harvey: retaining walls information sheet (2026)
• Law Handbook, Legal Services Commission of South Australia: retaining walls
• Meander Valley Council: low-risk building work, retaining walls (categories 1.3.14 and 2.3.2)
• Cost guide A: retaining wall cost Australia, last verified October 2026 (lead-generation site)
• Cost guide B: retaining wall cost in Australia, 2 September 2026 (vendor-published)

General information only, current at 2026-10-10. Pool rules differ by state and by council, and penalty amounts are updated regularly. Confirm your own obligations with your council or a registered inspector before acting.