Underpinning cost per metre in NSW typically spans a wide band depending on method, access difficulty, depth to competent ground and the number of corners involved. This guide explains what drives that per-metre figure, when to use it as a comparison tool, and what a legitimate itemised quote should show before you sign. If you want to understand whether your own situation is straightforward or complex, start with a foundation inspection before approaching contractors.
Why per-metre pricing exists at all
Underpinning involves working along the perimeter of a footing in sections. Because the work is linear, quoting a price per linear metre gives builders a simple unit to price from a structural engineer’s plan, and gives homeowners a number to compare across trades.
Per-metre pricing works reasonably well when the job is a long, straight run of external wall with consistent soil conditions, uniform depth requirements and easy access on one side. That describes perhaps a third of real-world underpinning jobs. On everything else, per-metre pricing alone can hide the true cost until after you have signed.
The alternative is per-pin pricing, which prices each underpinning pit individually. Our guide to how underpinning quotes are built explains both models and when each is more transparent.
The method premium: concrete vs screw pile vs resin
The biggest single variable in underpinning cost per metre in NSW is the method chosen. The three common methods sit in different cost bands:
| Method | Indicative cost band (per linear metre) | Best suited to |
|---|---|---|
| Mass concrete (traditional) | Lower band | Straight runs, good access, shallow bearing depth |
| Screw pile (mini pile) | Mid to upper band | Poor access, deeper competent strata, reactive clay |
| Resin/polyurethane injection | Variable: depends on void volume | Localised settlement, slab-on-ground, less suitable for deep strip footings |
These are unvalidated indicative bands only. Actual pricing on your site depends on soil, depth, access, disposal costs and contractor overhead. Always treat these bands as orientation, not a budget line.
For a deeper comparison of concrete versus screw pile methods, see our screw pile vs concrete underpinning guide.
Access, depth and spoil disposal factors
Access is priced into a per-metre rate even when it is not broken out as a line item. A long, open side wall with machinery access costs less per metre than an enclosed courtyard or an internal footing under a narrow hallway.
Depth matters because deeper pits require more excavation, more spoil removed and more concrete. Most quotes assume a standard bearing depth. When the engineer specifies deeper pits to reach competent ground, the per-metre cost rises, sometimes significantly.
Spoil disposal has become a genuine cost component in NSW. Excavated clay from a Wagga Wagga underpinning job needs to go somewhere. If the block has no room to spread it, disposal truck runs add to the total. Some quotes do not include this until the work starts, which is one of the most common sources of variation claims. See our article on hidden costs after the quote is signed for the full list of what to watch.
What a fair per-metre quote should list
A per-metre quote that covers you properly should itemise at minimum:
- Linear metres quoted and the specific sections of wall covered
- Method specified (mass concrete, screw pile, other)
- Assumed depth to bearing and what happens if the engineer requires more
- Spoil removal and disposal (included or provisional sum)
- Reinstatement of paths, garden beds or concrete that sits over the footing zone
- Engineer monitoring and hold-point inspections (included or separate)
- DA or council consent, where required
Any item listed as a provisional sum is an estimate only. Provisional sums for rock, obstructions or unexpected soil can expand a quote materially. Ask each contractor to explain every provisional sum before you sign.
NSW Fair Trading guidance on home building contracts sets out what must be in a contract for work above the threshold. Contracts over $20,000 require a detailed written contract, including how variations are handled.
Where per-pin pricing beats per-metre
On a job with fewer than six to eight pins, irregular spacing or significant corner work, per-pin pricing often gives a clearer picture. This is because corner pits typically involve more hand excavation and the pit geometry changes at an internal corner. A straight-run rate does not capture this well.
Ask your contractor whether they can provide a per-pin schedule alongside the per-metre rate. If the totals are far apart, find out why before selecting either.
Our detailed cost guide covers total-job cost ranges and the factors that shift a project from the lower to the upper end, which is useful reading before you approach quotes.
Red flags in a per-metre number that looks cheap
A per-metre price well below the rest of the market can mean several things, not all of them good. Common causes:
- Shallow assumed depth. The quote assumes competent ground close to the surface. If the engineer requires deeper, a variation claim follows.
- Spoil disposal excluded. The low rate assumes you absorb the truck runs.
- No reinstatement. The low number covers excavation and concrete only. Paths, tiles, garden beds and stormwater connections are extras.
- No engineer fees. Some contractors price engineering as a separate engagement; others include a set number of inspections. Confirm this before comparing rates.
- Fewer pits than the engineer specifies. Confirm the structural engineer’s recommendation for pit spacing and check it matches what the contractor has quoted.
For a full read on what makes quotes vary legitimately versus what should raise a question, see why underpinning quotes vary so much.
If your budget is tight, a staged repair plan can spread work across financial years while protecting the structure. Ask your engineer what is genuinely safe to defer.
Our underpinning service page outlines how we approach Wagga Wagga and Riverina jobs and what the inspection process looks like.
FAQs
Is there a fixed per-metre rate for underpinning in NSW?
No. Per-metre pricing varies by method, access, depth, spoil disposal and contractor. Treat any single figure as orientation only; the actual number for your home requires a site visit and a structural engineer’s scope.
Does per-metre pricing include the engineer’s report?
Often not, though some contractors bundle a set number of engineer inspections into their rate. Always ask what is and is not included. The engineer’s scope of works and any hold-point inspections should be confirmed in writing before the contract is signed.
Can I use per-metre quotes to compare different methods?
Only if the scope is identical. Comparing a mass-concrete per-metre rate to a screw-pile per-metre rate without knowing the assumed depth, pit spacing and reinstatement scope will produce a misleading comparison. Ask each contractor to quote the same engineer’s specification.
Are per-metre costs higher in Wagga than in Sydney?
Regional pricing is generally lower on labour, but transport and mobilisation costs for specialist equipment can offset some of that saving on smaller jobs. Get at least two quotes from contractors familiar with Riverina conditions.
What happens if the ground is harder or softer than assumed?
Variations are common when soil conditions differ from the desktop assumption. A reputable quote will specify the assumed condition and the rate for additional depth or changed ground. Confirm this before you sign, so there are no surprises mid-job.