Uneven floors in a house are one of the clearest signs that something has changed in the structure below. In Wagga Wagga, the most common causes are stumps that have rotted or sunk in a timber-floor home, or footings that have moved on reactive clay soil. The fix depends entirely on what has moved and why, so before you call anyone, take a few minutes to measure the slope and look for the other signs that usually travel with it, then book a foundation inspection to confirm what you are dealing with.
How to measure a slope yourself in five minutes
You do not need specialist equipment to get a useful reading. Two methods work well in a domestic setting.
Marble test: Place a marble on the floor in the middle of the room. Watch where it rolls. If it rolls consistently toward one wall or corner, you have a permanent slope. If it only moves a little and stops near the middle, the floor may simply be uneven rather than sloped in a single direction.
Spirit level and tape: A 1.2-metre spirit level will give you a clearer reading. Place it flat on the floor and measure the air gap under the low end with a ruler. A gap of 12 mm under a 1.2-metre level equates to roughly a 1:100 slope. A gap of 24 mm is around 1:50.
A slope under about 1:100 across a typical room is often within the tolerance range for older Australian homes and may not require active repair, though it still warrants monitoring. Slopes of 1:50 or steeper across a room, or any slope that is getting worse over time, are worth investigating properly. Combine this measurement with a look at why foundations move in Wagga to understand the soil context.
The three usual suspects: stumps, footings and joists
Uneven floors in a Wagga home generally trace back to one of three sources.
Stumps (timber-floor homes): The most common cause in post-war fibro and weatherboard homes. Timber stumps rot, termites attack them, and over decades they sink into soft ground or simply compress under load. One stump dropping 20 mm can tilt an entire room.
Footings (brick or slab homes): On reactive clay, strip footings can drop if the clay below dries out during a drought or if moisture imbalance pulls one side down further than another. This is gradual movement but cumulative over years.
Floor joists (deflection rather than settlement): A bouncy, springy floor that does not permanently slope may point to joist problems, particularly if the joists are undersized, notched incorrectly, or suffering from decay. This is deflection under load rather than permanent settlement, and the fix is different. See restumping versus underpinning for how to distinguish the underlying cause.
Timber-floor homes versus slab-on-ground
The type of construction matters enormously for diagnosis and repair.
Timber-floor homes have a raised sub-floor supported by stumps. Settlement is concentrated at individual stumps, so floors can slope in localised sections rather than across the whole house. The good news is that fixing a timber-floor home that has settled is often more straightforward: stumps can be replaced, shimmed or packed, and the floor re-levelled without major structural work.
Slab-on-ground homes sit on a concrete slab that is designed to move as a single unit on reactive clay. When it works well, the slab bends slightly but stays connected. When it fails, sections of slab separate or drop, creating a defined edge or step underfoot. Repair options include resin injection to fill voids and lift the slab, or screw pile underpinning to restore load-bearing capacity at depth. See our house relevelling service for an overview of how this works in practice.
Also check for secondary symptoms that go with uneven floors. Sticking doors and gaps at skirting boards often appear in the same part of the house. Cracks above door and window openings are common when a wall is being pulled by floor movement below.
Suburb patterns: Turvey Park stumps, Estella slabs
Wagga’s housing stock splits roughly along suburb lines, and the floor problem you are likely dealing with reflects that split.
Turvey Park, North Wagga and Ashmont have a high concentration of post-war timber-floor homes, many originally built on hardwood stumps. Decades of soil movement and moisture cycling have stressed these stumps, and floor slopes in these areas are often traceable to individual stumps that have dropped or rotted. The guide to post-war timber-floor homes in Wagga covers these suburbs in detail. The signs your house needs restumping checklist is also useful starting point if you are in these areas.
Estella, Boorooma and Gobbagombalin are predominantly slab-on-ground construction on cut-and-fill sites. Floor unevenness here is more likely to reflect differential slab settlement, particularly near fill zones or where drainage has not been managed well. Our restumping and reblocking service covers the timber-floor side, while underpinning is often required for slab-based issues.
When re-levelling fixes it and when underpinning is needed
| Problem | Likely repair | When it is appropriate |
|---|---|---|
| Sunken stumps, stumps still structurally sound | House re-levelling (packing or shimming) | Short-term slippage, stump still solid |
| Rotten or badly settled stumps | Restumping or reblocking | Stump material failed or irreparable |
| Dropped slab section with voiding beneath | Resin injection or underpinning | Depends on load, void size and stability |
| Dropped footing on reactive clay | Concrete or screw pile underpinning | Active footing movement confirmed by inspection |
| Bouncy floor from joist deflection | Joist sistering, replacement or packing | Movement is live deflection, not permanent settlement |
The distinction between re-levelling and underpinning matters because the two involve very different scopes and costs. Re-levelling adjusts what is already there; underpinning installs new bearing capacity below what failed. A foundation inspection is the only reliable way to know which one applies to your situation.
Indicative repair cost ranges
The following ranges are indicative regional patterns only. Actual costs depend on site conditions, access and scope confirmed at inspection.
| Repair type | Indicative range (AUD) | Key variables |
|---|---|---|
| Partial re-levelling (shimming stumps) | $1,500 to $5,000 | Stump count, access |
| Full restump (concrete stumps, average home) | $15,000 to $40,000+ | Home size, stump count |
| Resin injection for slab voiding | $3,000 to $15,000 | Void extent, access |
| Concrete underpinning (per pin) | $600 to $1,500 per pin | Footing depth, soil conditions |
Get at least two quotes on any job above $10,000, and make sure each quote specifies the same scope. Our house relevelling service page explains how the quoting process works.
FAQs
How much floor slope is too much in a Wagga home?
There is no single universal threshold, but as a rough guide, a slope greater than about 1:100 across a room (12 mm drop over 1.2 metres) is worth monitoring. A slope of 1:50 or greater is generally considered significant in a residential setting and warrants professional assessment. Historical slopes that have been stable for many years are treated differently from slopes that are actively increasing.
Can I fix uneven floors myself?
Packing or shimming an individual stump that has slightly sunk is sometimes a DIY job in accessible sub-floor spaces, but it should only be done if the stump itself is still structurally sound. Replacing stumps, pouring underpins or injecting resin are specialist jobs. Getting the diagnosis wrong and treating a footing problem as a joist problem can make the underlying cause worse.
Are uneven floors dangerous?
A floor slope in itself is rarely a safety hazard to occupants in the short term. The concern is what is causing the slope and whether it is progressing. A slope that is getting steeper over months indicates active movement and should be inspected promptly. Floors that have been stable at their current angle for years are lower urgency but still worth understanding and documenting.
How long does restumping take for a typical Wagga home?
A partial restump of a few stumps can take a couple of days. A full restump of a standard three-bedroom timber-floor home typically runs one to three weeks, depending on access, weather and the number of stumps. Most homeowners can stay in the house during restumping, though some disruption to floor coverings and routine is normal.
What if the sloping floor is in a room I just renovated?
If a floor started sloping after a renovation, the renovation may have inadvertently added load in a new location, disturbed existing bearers or footings, or altered sub-floor drainage. These cases warrant early professional assessment rather than waiting, because building over a movement problem generally makes it more complex to fix later.