The short answer
A structural engineer in Geelong inspects cracks, sticking doors, sloping floors and slab movement, finds the likely cause and explains it in a signed engineer's report. Many Geelong suburbs have reactive clays, many older homes are weatherboards on stumps, and some coastal areas have sandy soils, so the inspection is matched to the house and the ground. Ours start from $450 + GST, and we never sell or carry out repairs.
Structural engineer Geelong: quick facts
- Typical houses
- Weatherboards on stumps, brick homes and newer slab homes
- Ground
- Reactive clays in many suburbs; sandy soils in some coastal areas
- Common signs
- Sloping floors, sticking doors, gaps in linings and slab cracks
- Also covered
- The Bellarine Peninsula, the Surf Coast and Melbourne
- Signed by
- A structural engineer
- Price
- From $450 + GST, fixed quote in 1–2 business hours
Why do Geelong houses crack and move?
Usually because the ground under them changes. Reactive clays in many Geelong suburbs shrink as they dry and swell when wet, so footings and stumps rise and fall with the seasons, and trees, leaks and drainage often decide which part of the house moves most.
How that movement shows depends on the house. Many older Geelong homes are weatherboards on stumps, which flex rather than crack: you notice a floor that slopes toward one corner, a door that binds every summer, or gaps opening in the linings. Brick homes and newer houses on slabs are stiffer, so the same movement shows up as cracks in brickwork, plaster or the slab. Newer slab homes aren't immune either: if a leak, poor drainage or a dried-out slab edge changes the moisture under one part of the slab, that part can lift or drop relative to the rest.
A structural engineer in Geelong works out which of these is happening and whether it matters: whether the movement is seasonal and harmless, or progressive and in need of a repair. That answer comes before any quote for restumping or underpinning, not after it.
What are the most common causes of house movement?
Trees, reactive clay, leaks and poor drainage, and poorly compacted fill. Movement often has more than one contributor, which is why the cause should be confirmed before anyone prices a repair.
What moves a house? Four common causes
- Trees and roots draw moisture from the soil near a footing, so clay under that side shrinks.
- Reactive clay swells when wet and shrinks when dry, moving footings with the seasons.
- Leaking pipes or poor drainage soak and soften the ground under part of the house.
- Poorly compacted fill keeps settling under a footing long after the house is built.
Trees
A large tree close to the house dries the clay under the nearest footing or stumps, so that corner can drop in dry weather. Removing a big tree changes soil moisture too, so get advice before it comes out.
Reactive clay
Clay shrinks as it dries and swells when wet. A house on it moves with the seasons, and problems start when one part moves more than another.
Leaks and drainage
Leaking pipes, downpipes discharging against a wall and water ponding under a raised floor soak and soften the ground under part of the house.
Fill
Poorly compacted fill can keep settling under a footing long after a house is built, which matters wherever a block has been built up or levelled.
What happens to weatherboards on stumps?
They tend to show movement as uneven floors, sticking doors and windows, and gaps in linings rather than long masonry cracks, because the timber frame flexes and each stump can rise or sink a little on its own.
In a weatherboard on stumps, the engineer:
- Takes floor levels across the rooms to map where the floor has dropped or lifted
- Checks doors and windows for binding, racking and wedge-shaped gaps at the head
- Inspects the stumps, bearers and subfloor that can be reached safely
- Looks at linings, cornices and joints, and at any brick chimney or base
- Checks for water under the house, leaking plumbing and downpipes discharging near the stumps
When a weatherboard needs foundation work, it's usually restumping (also called reblocking), which replaces the stumps of a raised timber-floored house. Underpinning is the equivalent for slab and strip-footing homes, often masonry ones. Either way, the cause should be confirmed first: new stumps in ground that stays wet, or beside a tree that keeps drying the clay, can move again.
Before you accept a restumping quote
A restumping company's inspection is part of its quote. An independent engineer's inspection tells you whether the floor is moving because of the stumps, the soil, drainage or a leak, and what actually needs doing, so any quote you get is for the right work.
Clay or coastal sand: does the ground matter in Geelong?
Yes. Reactive clays in many Geelong suburbs move with the seasons, while sandy soils in some coastal areas are generally far less reactive: AS 2870 puts most sand sites in Class A, with little or no ground movement. On sand, cracking more often points to something else.
| Reactive clay areas | Sandy coastal areas | |
|---|---|---|
| How the ground behaves | Shrinks as it dries and swells when wet, so footings move with the seasons | Generally little or no seasonal movement; most sand sites are Class A |
| Common triggers | Trees, leaks, poor drainage and long dry spells | Poorly compacted fill, and leaks or drainage softening the ground under a footing |
| Typical signs | Cracks that open and close with the seasons, sticking doors, slab heave or settlement | Settlement cracks, often diagonal and wider at one end, near the part that has moved |
| What we check most | Crack behaviour over time, floor levels, trees and drainage | Fill, drainage, plumbing and the building itself |
Site class comes from a soil test, not a suburb
Ground can change within a short distance, so a site's class under AS 2870 comes from a geotechnical investigation of that site. If a repair is being designed, the report will say whether one is needed first. Read more in our guide to reactive clay and slab heave.
When should you call a structural engineer in Geelong?
When a sign keeps getting worse, or several appear together. Book a crack inspection if you notice:
- A crack 5 mm or wider, or one that's wider at one end than the other
- Cracks that keep growing, or reopen after they've been filled
- A floor that slopes toward one corner or along one wall
- Doors and windows that bind, especially if it changes with the seasons
- Slab cracks, tiles cracking in a line, or a slab edge lifting or dropping
- A restumping or underpinning quote you'd like checked against an independent view of the cause
Fine cracks and slight seasonal sticking are common in older homes and often harmless. Our guides to cracks in walls and house subsidence and movement explain where the line sits.
What's in a Geelong structural engineer's report?
Everything you need to decide what to do next, in plain English and signed by the engineer:
- What we looked at and found: the concern and scope, then cracks located and measured for width, length and pattern, doors, windows, floor levels, drainage, plumbing signs, trees and site conditions
- How serious it is: crack ratings against the AS 2870 damage categories, and the severity of the movement overall
- Why it's happening: the likely cause or causes, whether that's stumps, soil moisture, a leak, drainage, a tree or fill
- What to do: no action, maintenance such as fixing leaks or drainage, monitoring, further testing such as a soil or plumbing test, or a repair to be designed, with photos and the limits of the inspection
Because we don't sell restumping, underpinning or any other repair, the recommendations are about your house, not a product, and the report can go straight to a builder, your insurer or a buyer.
Which inspection do you need in Geelong?
Work through these four questions to find the right starting point. Every service is carried out by an independent engineer, with a fixed quote before we start. Need a foundation engineer in Geelong? For a house, that's a structural engineer who looks at the stumps, footings and ground along with the walls and floors above, which every inspection here covers.
Are you buying the house?
Cracks or sloping floors in a house you're about to buy need explaining before you commit.
Yes → pre-purchase structural inspection, from $450 + GSTNo → go to 2Have you already been quoted for underpinning?
An independent check of the cause, scope and exclusions before you sign.
Yes → underpinning quote review, from $390 + GSTNo → go to 3Are there cracks, sloping floors or sticking doors?
The engineer measures the damage, rates it against AS 2870 and finds the likely cause.
Yes → foundation and crack report, from $450 + GSTNo → go to 4Do you need to know whether movement is still active?
Readings over time show whether cracks are stable, seasonal or progressive.
Yes → crack monitoring, fixed quoteNo → house structural inspection, from $450 + GST
Structural defects to document for a builder, a sale or a dispute? See our building defect reports.
Do foundation repairs in Geelong need a permit?
Underpinning usually does. In Victoria, underpinning usually needs a building permit with an engineer's design, and councils may also require an asset protection permit when works use the frontage. Your building surveyor and the council can confirm what your job needs.
We provide the engineering for the permit and the work, never the construction. That means confirming the cause (sometimes with a geotechnical soil investigation or a plumbing test first), designing the repair, preparing documents for the building permit, inspecting the critical stages and certifying the finished work. Any licensed contractor can build it, and restumping and underpinning contractors can engage us directly through engineering for contractors.
Mass concrete, piers, screw piles and resin injection each suit different soils and causes, and none suits every house. Read what underpinning is and what underpinning costs, or see underpinning design and certification.
Buying a weatherboard or brick home in Geelong?
Get the movement explained before you commit. A sloping floor in an older weatherboard might need a few stumps attended to, or it might point to a drainage or soil problem that will keep coming back, and a general building inspection isn't designed to tell you which. A structural engineer can give you the likely cause and the kind of repair, if any, that's likely to be needed.
Cooling-off in Victoria
The general cooling-off period for residential sales in Victoria is 3 business days, and exceptions such as auctions apply, so check your contract. Tell us your deadline when you ask for a quote and we'll confirm whether we can meet it. General information only, not legal advice.
See pre-purchase structural inspections for what the inspection covers.
How does a structural inspection in Geelong work?
Six steps, from your first photos to a certified repair if one is needed. The process can finish at step four or five if the cause turns out to be water, a tree or seasonal movement rather than failed footings.
- Before you call
Record the symptoms
Photograph cracks with a ruler in shot, note which doors stick and in which season, and if it's safe to look under the house, note any stumps that lean or ground that stays wet.
- Within 1–2 business hours
Get a fixed quote
Send the address, your photos and any restumping or underpinning quotes you've received. We reply with a fixed fee and an inspection time.
- On site, 1–3 hours
Inspect and take floor levels
The engineer maps the cracks, takes floor levels, checks doors and windows, inspects the subfloor or slab, and looks at drainage, trees and the site.
- After the inspection
Read the cause and options
Your signed report rates any cracks against AS 2870, explains the likely cause and how serious it is, and recommends no action, maintenance, monitoring, further testing or a designed repair.
- If water or trees are involved
Deal with the cause first
Leaks, drainage and trees are dealt with before any structural work, and repeat readings across the seasons show whether the movement settles.
- If repairs are needed
Design, permit and certify
We design the repair, prepare documents for the building permit, inspect the critical stages and certify the work. Any licensed contractor can build it.
How much does a structural engineer cost in Geelong?
Our on-site inspections with a written engineer's report start from $450 + GST for a typical house. Underpinning quote reviews start from $390 + GST, and design, certification, defect reports and crack monitoring are fixed-quoted for each job.
The fixed price depends on the size of the house, subfloor access and what needs checking, and the report delivery date is confirmed in your quote. See structural engineer fees, or request a foundation and crack report now.
Standards and legislation referenced
- Standards Australia, AS 2870-2011 Residential slabs and footings. Site classification, and Appendix C, Table C1: classification of damage to walls