Cost of Concrete Slab for Garage: A Guide
Thinking about pouring a concrete slab for your garage? The good news is that pricing this out doesn't need to be complicated. While every property is a little different, there are some general ranges and standards that give you a solid starting point for budgeting.
This guide walks through what a typical garage slab costs, how concrete path thickness is generally worked out in NZ, and roughly what it costs to have concrete laid overall. Keep in mind these are general figures meant to help you get comfortable with the numbers — every site has its own quirks, so if you've got a specific project in mind, the quickest way to get an accurate price is to fill in our quote form and we'll take it from there.
What Does a Garage Slab Typically Cost?
Garage slabs are generally priced by square metre, and the main thing that affects cost is whether your slab needs to be “structural” or “non-structural”.
A non-structural slab — one that simply sits under a freestanding garage or shed and doesn’t carry any of the building’s actual structural load — typically costs around $100 to $130 per square metre for a standard 100mm to 150mm thick pad on a well-prepared base. For a single garage of around 20 to 25 square metres, that generally works out to somewhere in the $2,000 to $3,300 range.
A structural slab, needed when the garage is attached to your home or the slab itself forms part of the building's foundation system, usually costs more — often at least 25% above the non-structural rate — because it requires additional engineering, thickened edges, and extra reinforcing steel.
| Garage Slab Type | Typical Thickness | Estimated Cost (per m²) | Single Garage (20–25m²) |
|---|---|---|---|
| Non-structural (freestanding garage) | 100mm – 150mm | $100 – $130 | $2,000 – $3,300 |
| Structural (attached/load-bearing) | 100mm – 150mm+ | $130 – $165+ | $2,600 – $4,100+ |
These figures are a helpful starting point rather than a fixed price — access, ground conditions, and any extra site prep can move the number in either direction, which is completely normal and nothing to worry about. It's simply part of getting a quote tailored to your actual property.
Concrete Path Thickness NZ
If your project also includes a path leading to or around the garage, thickness is one of the easier things to get right, since New Zealand has clear general guidance to work from.
For a standard pedestrian path — one that's only ever going to see foot traffic — a minimum thickness of around 75mm is typical. This is a comfortable, well-established standard that works well for most backyard and garden paths.
If the path is likely to see the occasional car or light vehicle crossing it, or if it sits on softer or less stable ground, a slightly thicker pour of 100mm to 125mm is generally recommended for extra durability and peace of mind.
| Path Type | Typical Use | Recommended Thickness |
|---|---|---|
| Standard footpath | Foot traffic only | 75mm |
| Path with occasional vehicle use | Cars, light vehicles crossing | 100mm – 125mm |
| Heavy-duty path | Trucks, heavier loads, unstable soil | 125mm+ |
Most residential paths sit comfortably within these ranges, and your contractor will factor in your specific ground conditions and intended use when recommending the right thickness for your project — there is no need to get this exactly right yourself before reaching out.
Cost to Lay Concrete NZ
Zooming out to general concrete laying costs, prices in New Zealand typically fall within a fairly consistent, predictable range depending on the type of project.
As a broad guide, plain concrete for driveways, garage slabs, and paths generally costs somewhere between $90 and $160 per square metre supplied and laid, with the final number depending on the finish chosen, site access, and how much ground preparation is involved. Decorative finishes like exposed aggregate or coloured concrete sit a bit higher, typically $120 to $220 per square metre, simply because they involve extra materials and finishing time.
| Project Type | Typical Cost (per m²) |
|---|---|
| Garage slab (non-structural) | $100 – $130 |
| Concrete path | $90 – $140 |
| Plain concrete driveway | $90 – $160 |
| Decorative concrete (aggregate/coloured) | $120 – $220 |
What tends to move these numbers most isn't the concrete itself, but what's happening underneath it — excavation, base preparation, and drainage. A well-prepared base is what makes a slab or path perform well for decades, so it's a worthwhile part of the process rather than something to be concerned about.
Getting an Accurate Price for Your Project
The ranges above are here to help you get a general feel for costs and plan your budget with confidence — they're not meant to be exact figures, and there's no reason a driveway or garage slab project should feel daunting. Every site has its own character, from ground conditions to access, and that's exactly why we offer free, no-obligation quotes tailored to your property.
If you've got a garage slab, path, or driveway project in mind, the easiest next step is to fill in our quote form with a few details about your site. We'll take it from there and get back to you with clear, accurate pricing — no guesswork required.
Frequently Asked Questions
How much does a standard single garage slab cost?
A non-structural slab for a single garage (around 20–25m²) typically costs between $2,000 and $3,300, depending on site conditions and access.
Do I need a structural slab or a non-structural one?
This generally comes down to whether your garage is attached to your home or freestanding, and whether the slab needs to carry structural load. We're happy to advise on this once we know a bit more about your project.
How thick should a concrete path be?
Standard pedestrian paths are typically 75mm thick, while paths expected to handle occasional vehicle use are usually 100mm to 125mm.
Why do concrete quotes vary so much between contractors?
Differences usually come down to site preparation, thickness, reinforcement, and finish — comparing what is included in each quote, not just the total, gives you the clearest picture.
What's the easiest way to get an accurate quote?
Simply fill in our quote form with some basic details about your project and site. We'll follow up with clear, tailored pricing so you know exactly what to expect.