A concrete garage slab is one of those jobs where the price varies a lot depending on what’s actually involved. Size is the obvious factor, but thickness, reinforcement, site conditions, and what’s included in the quote all affect the final figure.
This guide covers what a garage slab typically costs in Melbourne in 2026, the difference between single and double garage slabs, what affects the price, and what questions to ask before you commit to a quote.
Garage Slab Cost Per m2 in Melbourne
A standard residential garage slab in Melbourne typically runs $75 to $120 per m2 for a plain broom-finished slab with standard reinforcement. The table below gives a more detailed breakdown by scenario.
| Slab type | Rate (per m2) | Typical total | Notes |
| Single garage (plain finish) | $75 – $105 | $2,800 – $4,200 | ~30–36 m2; standard mesh reinforcement |
| Double garage (plain finish) | $70 – $100 | $4,500 – $7,000 | ~55–65 m2; larger area reduces rate |
| Slab with steel bar (reo) reinforcement | $90 – $130 | Add $400–$900 | For heavier vehicles or poor soils |
| Polished or honed finish | $120 – $180 | Add $600–$1,800 | Grinding and sealing after cure |
| Epoxy floor coating | $30 – $60/m2 extra | Add $900–$2,500 | Applied after slab cures |
These are guide figures for Melbourne’s south-east. Every job is quoted individually after a site visit because excavation depth, access, and ground conditions all affect the final price.
Single vs Double Garage Slab: What’s the Difference in Cost?
A single garage slab is typically 3m to 3.6m wide and 5.5m to 6m deep, giving a footprint of around 17 to 22 m2 for just the internal floor area. With the full concrete area including apron and surrounds, most single garage slabs fall in the 28 to 36 m2 range.
A double garage is typically 5.4m to 6m wide and the same depth, coming in at 30 to 40 m2 internally and 50 to 65 m2 including the apron. The per-m2 rate tends to drop slightly on a double garage because setup, concrete delivery, and labour costs are spread across a larger area.
The difference in total cost between a single and double garage slab is real but not double. If a single slab costs $3,500, a double might cost $5,500 rather than $7,000, because a meaningful portion of the cost is fixed regardless of size.
What’s Typically Included in a Garage Slab Quote?
A complete garage slab quote should include:
- Excavation and removal of spoil to the required depth
- Compaction of the sub-base
- Formwork setup and stripping
- Vapour barrier (plastic membrane beneath the slab)
- Steel mesh reinforcement
- Concrete supply and pump or chute delivery
- Finishing (broom or trowel finish as specified)
- Control joints cut or tooled in
What’s not always included: sealing, epoxy coating, connection to an existing driveway or apron, drainage installation, and tree root removal. If any of these apply to your job, confirm upfront whether they’re in the quote or priced separately.
Slab Thickness: What’s Right for a Garage?
Most residential garage slabs in Melbourne are poured at 100mm thickness with steel mesh reinforcement. This is adequate for standard passenger vehicles and light SUVs.
Thicker slabs, 125mm or 150mm, are specified when the garage will hold heavier loads: large 4WDs, tradies’ work vehicles, storage racking systems, or workshop equipment. Reactive clay soils in parts of Melbourne’s south-east may also warrant a thicker slab or upgraded reinforcement to handle seasonal ground movement.
Going from 100mm to 125mm adds roughly $8 to $15 per m2 to the concrete cost alone. It’s worth spending the extra on a garage that’ll carry significant weight. It’s not necessary for a standard residential car garage.
What Affects the Cost of a Garage Slab in Melbourne?
Excavation depth and ground conditions
If the site is level and only needs a shallow cut, excavation is straightforward. Sloping blocks require more cutting and potentially a retaining edge. Hard rock or significant roots add both time and disposal costs. Sites with poor drainage or soft fill may need a deeper sub-base with additional compacted gravel before the slab goes down.
Access for equipment and concrete delivery
Most garage slabs are poured using a concrete pump or direct chute delivery from the truck. If access is tight, a pump is needed, which adds $350 to $600 to the job depending on the size and pump required. Properties in older Melbourne suburbs with narrow side gates or limited truck access will usually need a pump.
Reinforcement specification
Standard SL82 mesh is adequate for most residential garage slabs. Jobs on reactive clay soils or with heavier loads may be specified with SL92 mesh or additional reo bar. The cost difference is relatively small, typically $200 to $500 for a standard double garage, and it’s worth doing correctly from the start.
Finish type
A standard broom finish is included in most quotes. A trowel finish is smoother and slightly more expensive. Polishing, honing, or epoxy coating are add-ons that significantly increase cost but transform the garage floor for workshop or showroom use.
Connection to existing concrete
If the new slab needs to connect to an existing driveway or apron, the transition needs to be handled carefully to avoid a visible step or crack line. This may involve cutting back the existing concrete or forming a proper construction joint, both of which add to the job scope.
Do You Need Council Approval for a Garage Slab in Melbourne?
The slab itself doesn’t require separate approval in most cases, but the garage structure it supports usually does. In Victoria, a building permit is required for most new garages, carports, and sheds above a certain size and value. Requirements vary by council across Melbourne’s south-east.
If you’re pouring a slab as part of a permitted garage build, the concreter may need to work to engineer-specified dimensions and reinforcement. Confirm this with your builder or council before the job starts, since changing a slab specification after pouring is expensive.
Get a Quote for a Garage Slab in Melbourne
Con Ops pours garage slabs and concrete floors across Melbourne’s south-east, including Clayton, Glen Waverley, Oakleigh, Mulgrave, Chadstone, and Mount Waverley. Visit our concrete driveways and slabs page for more on our concrete work, or call 1800 266 677 to arrange a free site visit and quote.
We’ll look at the site, confirm what’s involved, and give you a fixed price with no surprises.
Frequently Asked Questions
How much does a single garage slab cost in Melbourne?
A standard single garage slab in Melbourne typically costs $2,800 to $4,200 for a plain broom-finished slab with mesh reinforcement, based on a footprint of around 30 to 36 m2 including the apron. Site conditions, access, and finish type affect the final figure.
How long does a concrete garage slab take to pour?
Most residential garage slabs are poured in a single day. Site preparation, including excavation, sub-base compaction, and formwork, may take a separate day beforehand depending on how much ground preparation is required. The slab needs 24 to 48 hours before foot traffic and around 7 days before vehicle access.
How thick should a concrete garage slab be?
100mm with SL82 mesh is the standard specification for a residential garage holding passenger vehicles. 125mm is recommended for heavier vehicles, workshop equipment, or reactive clay soil sites. Going thicker than 150mm is rarely needed for a residential garage.
Can I pour a garage slab myself?
Technically, yes. In practice, it’s a job most homeowners shouldn’t attempt without experience. Getting the sub-base preparation, formwork levels, concrete ordering, and finishing right within the working time of the concrete is genuinely difficult. A poor pour that needs to be cut out and replaced costs more than hiring a professional from the start.
Should I seal a new garage slab?
Yes. Sealing protects the surface from oil stains, water penetration, and general wear. It should be applied after the slab has fully cured, typically 28 days after the pour. Most concreters recommend a penetrating sealer for garage floors used for vehicles. Find out more about our concrete re-sealing service if you’re looking to seal an existing slab as well.
Can an existing garage floor be resurfaced instead of replaced?
Yes, if the existing slab is structurally sound. Surface cracking, staining, dusting, or a tired finish can all be addressed with a resurfacing overlay at a fraction of the cost of replacement. See our concrete resurfacing page for more on what’s involved.