By QED Consulting Engineers — structural & civil engineers, Notting Hill, Melbourne
You need a structural engineer for a renovation whenever the work affects your home's structure — removing or altering a load-bearing wall, adding a second storey, underpinning, or whenever your building surveyor requires structural certification for the permit. For purely cosmetic work, you usually don't.
Knowing which side of that line your project sits on early can save you delays at permit stage and prevent expensive problems later. Here's how to tell.
When do you need a structural engineer for a renovation?
You'll generally need a structural engineer when your renovation involves:
- Removing or modifying a load-bearing wall to open up a floor plan
- Adding a second storey or building over an existing structure
- Extensions and additions that add new structural loads
- Underpinning or fixing footing/foundation movement
- New openings for large windows, doors or bifolds in structural walls
- Structural certification required by your building surveyor for the building permit
If your project changes how loads travel through the building, an engineer needs to be involved.
What does a structural engineer actually do on a renovation?
The engineer assesses the existing structure, works out how the loads are carried, and designs any new structural elements — such as a beam to replace a removed wall, or new footings for an addition. They then produce the drawings and computations your builder follows and your building surveyor needs to issue the permit.
Our residential structural engineering team does exactly this across Melbourne — turning renovation ideas into safe, buildable, permit-ready designs.
Structural engineer vs building surveyor — what's the difference?
They're different roles. The structural engineer designs the structure and certifies it's sound. The building surveyor assesses the overall building work against the regulations and issues the building permit. On most structural renovations you'll deal with both — the engineer's documentation feeds into the surveyor's permit.
When you might not need one
Purely cosmetic work — new kitchens or bathrooms that don't touch structure, painting, flooring, or non-structural wall changes — usually doesn't need an engineer. If you're unsure whether a wall is structural, a quick assessment is worthwhile before you commit to a design.
Planning a renovation in Melbourne? Talk to a Melbourne structural engineer and we'll tell you exactly what your project needs.
Frequently asked questions
Do I always need a structural engineer to renovate? No — only when the work affects the structure (load-bearing walls, additions, second storeys, underpinning) or when your building surveyor requires certification. Cosmetic work usually doesn't.
What's the difference between a structural engineer and a building surveyor? The engineer designs and certifies the structure; the building surveyor assesses the work against regulations and issues the permit. Most structural renovations involve both.
When should I engage the engineer? Early — ideally during design, so the structure is coordinated before you apply for a permit and before your builder starts.
Can I remove a wall without an engineer? If it's load-bearing, no — the load must be transferred to an engineered beam. An engineer should confirm whether a wall is load-bearing before it's touched.
