Do You Need a Structural Engineer to Remove a Wall?

Opening up a kitchen, joining two rooms, or letting more light into a dark hallway almost always comes down to the same question: can we just take this wall out? Sometimes the answer is a simple yes. Other times, that wall is quietly holding up your roof, your upstairs floor, or both — and removing it without the right design can be dangerous and expensive.

Here's a clear guide from a registered engineering team on when you need a structural engineer to remove a wall, how to tell if a wall is load-bearing, what it costs, and the approvals you'll need in Australia.

The short answer

If the wall is load-bearing, yes — you need a structural engineer. They design a beam (and its supports) to safely carry the load the wall was holding, and provide the documentation your builder and council or certifier require. If the wall is genuinely non-load-bearing, you usually don't need an engineer — but you should confirm that before you start swinging a hammer, because it's not always obvious.

Load-bearing vs non-load-bearing: what's the difference?

A load-bearing wall carries weight from the structure above it — the roof, the floor of a second storey, or ceiling joists — and transfers that load down to the footings. Remove it without a replacement support and the loads have nowhere to go.

A non-load-bearing wall (or "partition") simply divides space. It carries little more than its own weight, so removing it is usually a straightforward renovation job.

The catch: you often can't tell which is which just by looking, especially in older homes that have been renovated before, where the original structure may have changed.

How to tell if a wall is load-bearing

These are clues, not confirmation — treat them as reasons to get a professional check, not a green light to start:

• It runs perpendicular to the floor or ceiling joists (walls that run across joists often support them).
• It sits roughly above another wall or beam on the floor below, or above a footing.
• It's an original external wall or a central "spine" wall of the house.
• There's a beam, bulkhead or post near it, suggesting load is already being managed there.
• It's masonry or double-brick in a location where partitions would normally be lightweight.

Because the cost of getting this wrong is so high, don't rely on DIY assessment or a "helpful neighbour." A structural engineer (or an experienced builder engaging one) can confirm it properly.

What a structural engineer actually does for a wall removal

For a load-bearing wall, an engineer will typically:

1. Assess the structure — inspect the wall, what it supports, and the load path down to the footings.
2. Design the replacement support — size a beam (steel or engineered timber) and its posts/supports to carry the load across the new opening.
3. Specify temporary propping — the structure has to be held up safely while the wall comes out and before the beam goes in; this step is often overlooked.
4. Provide documentation — stamped drawings and calculations your builder follows and your certifier or council relies on for approval.

In Queensland, that design certification is usually issued as a Form 15 by an RPEQ. (See our guide: [Form 15 vs Form 16 in Queensland].)

Do you need council approval to remove a wall?

In most of Australia, removing a structural (load-bearing) wall requires approval — you'll generally need engineering plans and a construction/building approval, and possibly an inspection during or after the work. Removing a genuinely non-structural partition often doesn't, but the rules vary by state and council, so confirm before you commit:

• NSW: structural changes typically need a Complying Development Certificate (CDC) via an accredited certifier, or a Development Application (DA) to council; a two-storey job usually adds a report on the existing structure.
• QLD: the beam design is certified via a Form 15, and your building certifier confirms what's required.
• VIC/ACT: a building permit is generally required for structural work, with engineered documentation.

Your certifier or engineer will tell you which pathway applies to your specific job.

What does it cost?

Two different costs are involved, and it helps to separate them:

1. The structural engineer's fee — for assessing the wall and designing the beam. As an indicative 2026 guide, a beam design for a standard single opening is often around $1,500–$2,500, while a complex open-plan design spanning 6–8 metres or multiple beams can reach $3,000+. A standalone site inspection/report is usually a few hundred dollars.
2. The total removal project — engineer plus builder, temporary propping, the beam itself, and making good (patching floors, ceilings, cornices, painting). As an indicative guide, a non-load-bearing wall might run $1,500–$3,000, while a load-bearing wall commonly lands anywhere from $3,000 to $10,000+ — and larger spans, two-storey loads, or steel beams in metro areas (for example, a rear load-bearing wall opened up with a steel beam) can run higher again.

These are ballpark ranges only. Your actual cost depends on the span, the load, access, what's inside the wall (plumbing, wiring, ducting), and finishes. The best way to know is a fixed quote based on your plans.

The typical process, step by step

1. Confirm the wall type — engineer or builder assessment.
2. Engineer designs the beam and support and issues documentation.
3. Approvals — CDC/DA or building permit as required.
4. Temporary propping installed to support the structure.
5. Wall removed and beam installed.
6. Inspection/certification where required, then finishing work.

Expect anywhere from a few days to a couple of weeks on site, plus lead time for design and approvals.

Ready to open up your space?

QED Engineers is a registered structural engineering practice working with homeowners, builders and architects across [QLD, NSW, VIC & ACT]. We'll assess your wall, design a safe, cost-effective beam solution, and provide the documentation your approval needs. Send us your plans for a fast, fixed fee proposal.

Request a Free Quote | Call: 0421 157 963

This article is general information only. Whether a wall is load-bearing, and which approvals apply, depends on your specific building and location — always have it assessed by a qualified engineer and confirm requirements with your building certifier or council before starting work.

Frequently asked questions

How do I know if a wall is load-bearing? Clues include walls that run perpendicular to the joists, sit above another wall below, or are original external walls — but these aren't definitive. Because the risk is high, have it confirmed by a structural engineer or an experienced builder rather than guessing.

Do I always need a structural engineer to remove a wall? Only for load-bearing walls (and any wall you're not certain about). Removing a genuinely non-load-bearing partition usually doesn't require an engineer, but it's worth a quick check first.

How much does it cost to remove a load-bearing wall? As an indicative 2026 range, the engineer's beam design is often around $1,500–$3,000, and the total project (including builder, beam and finishing) commonly runs from about $3,000 to $10,000+ depending on span, load and location.

Do I need council approval to remove a wall? Removing a structural wall generally requires approval — a CDC/DA in NSW or a building permit and engineered documentation elsewhere. Non-structural partitions often don't. Confirm with your certifier.

Can I remove a load-bearing wall myself? It's strongly discouraged. Load-bearing removal requires engineered design, safe temporary propping and correct beam installation — getting it wrong risks serious structural damage or injury.