25 MPa concrete · N25 normal class
25 MPa Concrete in Australia: Uses, Specs & Ordering
25 MPa concrete (N25) is one of Australia's most common residential ready-mix grades. It is normal-class concrete with a characteristic compressive strength of 25 MPa after 28 days.
N25 concrete is the standard choice for many residential driveways, garage slabs, paths, and ground-bearing slabs. In 2026, Sydney N25 material pricing is typically $340-370/m3 before delivery, short-load fees, pump hire, waiting time, and GST. Live availability is checked by postcode.
Reviewed by Ross Mildwater, Senior Advisor, Customer Operations at MixHub
Indicative material price
$340-370/m3
Sydney 2026 guide range. Delivery, short-load fees, pump hire, waiting time, and GST depend on postcode, date, volume, and access.
Common names
25 MPa (N25)
Suppliers, engineers, and plans may write this as 25 MPa, N25, or 25MPa. They all refer to the same normal-class concrete strength.
Compare before ordering
N20 / N32
Not sure whether to move up or down? Compare N20 concrete or N32 concrete before booking.
What does 25 MPa (N25) mean?
25 MPa is the strength rating: the concrete is specified to reach 25 megapascals after 28 days. N25 means normal-class 25 MPa concrete, and structural drawings may also refer to this strength as f'c = 25 MPa.
Normal-class spec at a glance
| Compressive strength | 25 MPa at 28 days |
| Normal-class grade | N25 |
| Slump | Often 80-100 mm for standard supply; pump, block fill, or special-class mixes can differ. |
| Aggregate | Commonly 10, 14, or 20 mm depending on product, reinforcement, pumpability, and supplier range. |
| Standards context | AS 1379 supply/specification and AS 3600 design references where structural drawings nominate f'c. |
Strength is only one axis
A concrete order is better thought of as strength x class x slump x aggregate x product/application. The MPa number tells you strength. The prefix or product name tells you what kind of mix is being supplied.
Example order wording
N25 25 MPa normal-class concrete, 80 mm slump, 20 mm aggregate, 12 m3 to site with direct truck discharge.
Where to use 25 MPa (N25) concrete
N25 is the residential workhorse: strong enough for many house slabs, standard driveways, garage floors, patios, and light-duty paved areas when the base, reinforcement, thickness, joints, and curing are correct.
Residential driveways
N25 is the usual minimum for passenger-car driveways when slab thickness, reinforcement, and base preparation are correct.
Garage and shed slabs
For non-engineered light residential slabs, N25 is commonly used with mesh, compacted base, and control joints.
Paths and small slabs
N25 is often selected instead of N20 when a path, pad, or small pour needs better durability for a modest grade uplift.
Price 25 MPa (N25) concrete for your postcode
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Grade decisions: use, avoid, upgrade, or downgrade
Always follow the engineer's specification, approved drawings, council requirements, or builder direction where they nominate a concrete grade, slump, exposure class, reinforcement, or aggregate size.
When not to use 25 MPa (N25)
- Engineer-specified slabs or footings that call for N32, N40, exposure-class concrete, or special-class concrete.
- Heavy vehicle driveways, shared accessways, commercial hardstands, or suspended slabs unless approved by the engineer.
- Pool surrounds, retaining wall footings, or wet/exposed structural elements where N32 or a higher specification is nominated.
| Decision | Recommendation | Why |
|---|---|---|
| Use N25 | Standard driveways, garage slabs, paths, and light residential slabs. | It balances durability and price for most residential projects. |
| Upgrade to N32 | Heavy vehicles, exposed footings, pools, structural slabs, or engineer-specified work. | The higher compressive strength gives more capacity where load, exposure, or specification risk is higher. |
| Downgrade to N20 | Only for non-structural paths, blinding layers, garden edging, or very light-duty work. | N20 can save money, but it is not the right choice for vehicle traffic or structural work. |
Plan the grade, volume, and delivery method together
N25 concrete FAQs
Is N25 concrete the same as 25 MPa?
How much does N25 concrete cost?
Should I order N25 or N32 for a driveway?
Can I use N25 concrete for a house slab?
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