Do You Need a Structural Engineer for Your Pool?

The short answer

If you’re building a fixed pool — concrete, fibreglass, or another in-ground or partially in-ground structure — you almost certainly need structural engineering as part of your council or building approval. The exception is genuinely temporary, non-fixed above-ground pools, which generally sit outside structural engineering requirements.

What a structural engineer actually does on a pool project

A structural engineer assesses your site and pool design, then produces the structural design, calculations, drawings and report that demonstrate the pool structure (and any retaining) will perform safely for its site and loading conditions. This is separate from your pool builder’s concept plans — see our engineering plans page for how the two differ.

What the engineering process actually looks like

In practice, the process typically runs: the engineer reviews your site details, concept plans and any available soil or site information; the structural design is developed for the specific pool shell and site; calculations are prepared to support that design; structural drawings are issued showing reinforcement, dimensions and any retaining; and a report ties the documentation together for submission to council or your certifier. See our pool structural engineering page for the full breakdown of this process.

Who typically arranges it

Sometimes your pool builder arranges structural engineering as part of their package; sometimes it’s left to the homeowner to organise directly. Either way, it’s worth confirming early in the project — structural engineering informs the pool design, not just the paperwork at the end. Engaging an engineer after the pool design is finalised can mean re-work if the site turns out to need retaining, deeper footings, or a different shell configuration than assumed.

When it becomes non-negotiable

• Any concrete or fibreglass in-ground pool
• Pools on sloping sites or requiring retaining
• Pools near boundaries or existing buildings
• Pool renovations or alterations to an existing structure
• Sites with a high water table, reactive soil, or known ground movement
• Pools that also function as, or sit near, a retaining structure

When it’s generally not required

Genuinely temporary, freestanding above-ground pools — the kind that can be removed without demolition and don’t involve permanent excavation or a fixed structure — generally sit outside structural engineering and building approval requirements. If there’s any doubt about whether your pool counts as "fixed" for approval purposes, that’s a question for your local council or building surveyor before you proceed.

What happens without it

Skipping structural engineering on a project that requires it typically means a council or certifier will not approve the build. If a pool is built without adequate structural design and a structural problem develops — cracking, movement, or in severe cases shell failure — the cost of diagnosing and fixing it after construction is far higher than engineering it correctly up front, and often involves partially or fully excavating a completed pool.

How to check if your project needs it

As a practical check: if your project involves anything other than a simple, flat, unconstrained site and a genuinely temporary above-ground pool, assume structural engineering is required and confirm with your engineer or council early. It’s a faster and cheaper conversation to have before excavation starts than after.