Concrete FAQs Sydney

Most licensed concreters in Sydney — including KMA — provide written quotes at no charge after a site visit. You should not pay for a quote on residential concreting work. If a contractor is charging for the quote, ask why before agreeing.

For most residential jobs — driveways, slabs, paths — we provide a written quote within 48 hours of the site visit. Commercial and larger-scope jobs are quoted within three to five business days depending on complexity.

A properly itemised concrete quote should include the sub-base preparation scope, the concrete mix design and strength grade, the reinforcement specification, the surface finish, any formwork scope, the payment schedule and the total price. If a quote is a single line — “driveway, 80m², $X” — ask for the itemised breakdown before signing.

The most common reasons are differences in concrete strength grade, whether sub-base preparation is included or excluded, whether reinforcement is specified or omitted, whether the crossover approval is included, and whether the contractor plans to use their own crew or subcontract the work. Always confirm the mix design, reinforcement specification and sub-base scope — not just the total price.

They should — but always confirm before signing. Our quotes are GST-inclusive and clearly state the total amount payable. Ask any contractor to confirm whether their quote is GST-inclusive or exclusive before committing.

Compare the concrete strength grade, the sub-base preparation included, the reinforcement specification, the surface finish and whether the council crossover is in scope — not just the total price. A quote that is significantly cheaper than others is typically excluding one or more of these items. The cheapest quote is rarely the best value once the job is complete.

Concrete driveway pricing in Sydney depends on the area, the finish type, the sub-base preparation required and whether a council crossover is included. Pricing varies significantly by job — we provide itemised written quotes after a site visit. Contact us for a site-specific price.

Slab pricing in Sydney depends on the floor area, the slab type — raft, waffle pod or shed slab — the soil classification, the reinforcement specification and the surface finish. House slabs to AS 2870 carry additional cost because the design is specific to the soil conditions on your block. For more on slab types and what drives their cost, see our raft slab vs waffle pod guide. Contact us for a site-specific itemised quote.

Ready-mix concrete, steel reinforcement, formwork materials and labour have all increased significantly across Greater Sydney since 2021 due to supply chain pressures and increased construction demand in Western Sydney’s growth corridors. Pricing you received two or three years ago is no longer a reliable benchmark — get a current site-specific quote before budgeting.

A cheaper quote typically excludes something. The most common exclusions are sub-base preparation, correct reinforcement, the council crossover approval, appropriate concrete mix design, or the contractor plans to subcontract the work. Under-specified concrete work fails faster — the cost of remediation or replacement almost always exceeds the saving at the quoting stage.

Yes — residential concrete is typically quoted on a per-square-metre rate, but this rate varies significantly by job scope, site access, finish type and sub-base condition. A per-square-metre rate quoted without a site visit is an estimate only, not a binding price. Always get a written fixed-price quote after the contractor has visited the site.

The most popular driveway finishes across Greater Sydney are exposed aggregate, plain broom finish and coloured concrete. Exposed aggregate reveals decorative stone by washing back the surface after the pour — it is textured, durable and the most popular premium option. Broom finish is non-slip, the most affordable and perfectly suited to standard residential use. For a full comparison of finishes, see our concrete driveways Sydney page.

A concrete driveway in Sydney lasts 25 to 40 years with basic maintenance when it is correctly poured over a compacted sub-base at the right thickness and mix design. The main causes of early failure are insufficient slab thickness, poor sub-base preparation and incorrect control joint placement.

A new driveway crossover — the section crossing the council footpath and kerb between your property and the road — requires approval from your local council before work begins. We manage the crossover approval process as part of every new driveway contract across Penrith City Council and surrounding council areas.

Keep vehicles off a new concrete driveway for a minimum of seven days after the pour. Full design strength is reached at 28 days — heavy vehicles such as trucks, concrete mixers or loaded trailers should not use the driveway until then.

Sealing is recommended for both plain and exposed aggregate concrete driveways in Sydney. It reduces water absorption, staining from oil and grease, and surface weathering from UV exposure. We can advise on the right sealer and timing as part of your job.

It depends on the type of cracking. Fine surface shrinkage cracks that have not penetrated the full slab depth and have not moved can often be filled and resurfaced. Structural cracking — where one side is higher than the other or the crack is widening — indicates sub-base failure and requires full removal and replacement. We assess the slab during the site visit and give you a straight recommendation. See our concrete resurfacing and repair page for more detail.

A residential concrete driveway should be a minimum of 100mm thick for standard car use over a correctly compacted sub-base. Driveways subject to heavy vehicle access — trucks, concrete mixers, caravans — should be 125mm minimum with heavier reinforcement. Driveways poured at 75mm or less are under-specified for vehicle traffic and will fail prematurely.

An exposed aggregate driveway is a concrete driveway where the surface cement paste is washed back after the pour to reveal the decorative stone aggregate below. The finish is textured, slip-resistant and visually distinctive — popular across Western Sydney’s newer residential estates. For a full guide, see our exposed aggregate driveway blog post.

A raft slab is a solid reinforced concrete slab with thickened edge and internal beams cast into excavated ground. A waffle pod slab uses polystyrene void formers to create the same beam pattern sitting above the ground surface — reducing excavation and concrete volume. The right choice depends on the soil classification on your block and the structural engineer’s design. For a full comparison, see our raft slab vs waffle pod guide.

Yes. All house slabs in NSW must be designed to AS 2870 — the Australian standard for residential slabs and footings — based on the soil classification of the block. The design must be prepared or approved by a structural engineer. We coordinate directly with the structural engineer of record on every house slab project across Greater Sydney.

AS 2870 is the Australian standard for residential slabs and footings. It classifies how reactive the soil on your block is — how much it moves with changes in moisture — and specifies the slab design requirements for each classification. Every house slab in NSW must comply with AS 2870. KMA designs and builds all house slabs to this standard as a baseline requirement on every residential project.

The pour itself for a standard single-dwelling house slab is completed in one day. The full programme — site preparation, sub-base, reinforcement placement and certifier inspection — is typically three to five days depending on slab type and site conditions.

Most builders begin framing no earlier than seven days after the pour, when the concrete has reached sufficient early strength for light construction loads. Confirm the minimum wait period with your structural engineer and certifier — the answer depends on the concrete mix design and the planned construction loads above the slab.

Under AS 2870, the minimum characteristic compressive strength for residential slab concrete is 25 MPa. Many designs specify 32 MPa for better durability and reduced permeability, particularly in reactive soil areas across Western Sydney. The structural engineer specifies the required strength grade for each project based on the soil classification and slab design.

A standard pedestrian path is a minimum of 1.0 metre wide. Side access paths for a wheelbarrow, mower or garden equipment are typically 1.2 to 1.5 metres. Side access for a vehicle — caravan, trailer or boat — requires a minimum of 2.4 metres and 100mm thickness with mesh reinforcement. See our concrete pathways Sydney page for the full range of path types we install.

Broom finish is the standard specification for concrete paths — it provides a non-slip textured surface that handles pedestrian and light vehicle traffic without additional treatment. Exposed aggregate is popular for front entry paths in visible areas. Smooth finish concrete is not appropriate for outdoor paths due to its slip risk when wet.

A concrete slab for a standard garden shed should be a minimum of 85mm thick over a compacted road base. For a workshop or garage with vehicle access, 100mm minimum with mesh reinforcement. For heavier use — vehicle hoists, machinery, heavy storage — 125mm or greater with bar reinforcement to the engineer’s specification. See our concrete slab for shed page for full thickness guidance.

For most residential concrete paths and shed slabs on private property in Greater Sydney, no development application is required. The shed structure itself may require approval depending on its footprint — confirm with your local council or certifier before building. Paths and crossovers that cross a public footpath require council consent for the portion on the road reserve.

It depends on the type of cracking. Fine surface shrinkage cracks that have not moved and have not penetrated the full slab depth can often be filled and resurfaced. Structural cracks — where the slab has settled, one side is higher than the other, or the crack is widening — indicate sub-base failure and require full removal and replacement. We assess the existing concrete during the site visit and give you a straight recommendation before any work is quoted.

Concrete resurfacing applies a new surface layer over an existing structurally sound slab — restoring appearance, changing the finish and extending the surface life at significantly less cost than full removal and replacement. It is only the right option where the slab underneath is structurally intact. If the slab has failed structurally, resurfacing delays the inevitable and costs more in the long run. See our concrete resurfacing and repair page for more detail.

Concrete cancer is the corrosion of steel reinforcement inside a concrete structure. As the steel rusts it expands, cracking and breaking off the surrounding concrete. The visible signs are rust staining on the surface, cracking that follows the reinforcement pattern below, and sections of concrete that are flaking or spalling away. Left untreated it compromises structural integrity. See our concrete cancer and spalling guide for a full explanation.

All concrete slabs crack to some degree — this is normal as concrete shrinks slightly during curing. Control joints are cut into slabs within 24 hours of the pour to direct where shrinkage cracks occur, so they happen at planned locations rather than randomly across the surface. A contractor who tells you the slab will not crack is not being honest. Proper thickness, sub-base preparation, mix design and control joint spacing all minimise uncontrolled cracking — they do not eliminate it entirely.

If the slab is structurally sound — no through-cracks, no vertical movement between sections, no significant settlement — resurfacing is worth considering. If there is structural damage, resurfacing is not appropriate and removal is the right call. We assess this during the site visit and give you a straight recommendation either way. See our guide on when to resurface vs replace concrete for the detailed decision guide.

Yes. All residential building work in NSW with a contract value over $5,000 — including labour and materials — must be carried out by a holder of a valid NSW contractor licence issued by NSW Fair Trading. This covers concrete driveways, slabs, paths and retaining walls. You can verify any contractor’s licence at the NSW Fair Trading website before signing anything.

Go to the NSW Fair Trading licence check, enter the contractor’s name or licence number and confirm the licence is current, active and covers the correct work category. KMA Concrete Constructions holds NSW Contractor Licence 219967C — you can verify this at any time before engaging us.

Ask the contractor to provide a current certificate of currency for their public liability insurance before work begins. A licensed contractor should be able to produce this without hesitation. KMA carries public liability insurance and provides evidence of currency on request as part of the quoting process.

Under the NSW Home Building Act 1989, residential building work over $20,000 is covered by a statutory warranty of six years for major defects and two years for all other defects from the date of completion. Work under $20,000 is covered by a two-year warranty for major defects. These warranties apply automatically — they do not need to be separately negotiated with your contractor.

The NSW Home Building Compensation Fund provides insurance protection for homeowners on residential building contracts over $20,000 if the contractor dies, becomes insolvent or disappears before completing the work or before the statutory warranty period expires. Licensed contractors must take out this insurance before accepting a deposit on eligible contracts — ask your contractor to confirm this before you pay any deposit.

Verify the contractor’s NSW licence number at the NSW Fair Trading website, confirm the quote is itemised and fixed-price, check that public liability insurance is current, confirm whether a crossover approval is included in scope, and ensure the contract specifies the concrete mix design and reinforcement. Do not pay a deposit without a written signed contract for any work over $5,000.

KMA Concrete Constructions is based in Emu Plains, Penrith, and services all of Greater Sydney — including Western Sydney, the Hills District, Parramatta, Liverpool, Campbelltown, Narellan, the Northern Beaches and surrounds. See our areas serviced page for the full suburb list.

KMA uses its own crew on every job — the crew that quotes your project is the crew that does the work. We do not subcontract residential or commercial concreting work to third parties.

For residential jobs we typically have availability within one to three weeks depending on the programme and weather conditions. For larger commercial or house slab work, contacting us four to six weeks before your preferred start date is recommended. Call 02 9054 3040 to check current availability.

We reschedule — we do not pour concrete in rain. Water on freshly placed concrete dilutes the cement paste at the surface and permanently reduces surface strength. If the forecast changes in the days before your pour, we contact you promptly to reschedule to the next available dry day at no cost to you.

No — but site access needs to be sorted before the morning of the pour. Gate access, cleared parking for the concrete truck and pump, and pets secured away from the pour area all need to be confirmed. We contact you the day before to run through all access requirements.

KMA Concrete Constructions has been operating across Greater Sydney since 1999 — over 25 years of residential and commercial concreting work based in Penrith and serving Western Sydney and the broader Greater Sydney region.

Yes. We deliver commercial concrete floors and slabs, carpark construction, council and school concreting, formwork and suspended slabs, polished concrete and concrete removal across Greater Sydney alongside our residential work. See our commercial concrete floors page and carpark construction page for scope detail.

KMA’s core services are house slabs to AS 2870, concrete driveways in all finishes, concrete pathways, shed and garage slabs, concrete resurfacing and repair, carpark construction, commercial concrete floors, polished concrete floors, formwork and suspended slabs, and concrete removal and demolition. See our services page for the full breakdown.