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A garage looks like the simplest structure you can add to a property, and in one sense it is: a slab, a frame, a roof and a door. What makes it more complicated than a shed is the moment it touches the house, because at that point two different building classifications meet and the Code has something to say about the junction.

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The National Construction Code classifies a private garage, carport, shed or the like as Class 10a, a non-habitable building. A detached house, or one of a group of attached dwellings separated by a fire-resisting wall, is Class 1a. A freestanding garage on its own is straightforwardly Class 10a. An attached garage, or a garage with living space above it, brings the two classes into contact, and Part H3 of Volume Two then requires fire separation, pointing to Part 9.4 of the ABCB Housing Provisions for garage-top dwellings. The same part also provides that for smoke alarm purposes a Class 1 building includes a Class 10a private garage located above or below it.

That single distinction — detached, attached, or with a dwelling above — changes the construction, the approval and the price more than the size of the garage does. Settle it before you get quotes, because a quote priced as a detached shed and built as an attached garage is a quote that will change.

Detached, attached, carport and garage-top: four different builds

  • A detached garage stands clear of the house, is straightforwardly Class 10a, and is the simplest and usually cheapest form.
  • An attached garage shares a wall or a roof junction with the dwelling, which brings the separation requirements between the two classifications into play.
  • A garage with habitable rooms above is a garage-top dwelling, the most heavily regulated version, and it needs the fire separation the Code points to in the Housing Provisions.
  • A carport is open-sided, is also Class 10a, and is far cheaper because there is much less structure and no door.
  • A kit garage arrives as components with an engineering package, and the variable is the slab, the site preparation and who is responsible for approvals.
  • A custom-built garage matched to the house in cladding and roof pitch costs more and is usually what a heritage or design-controlled area requires.

Classification, approval and who issues it

Two separate approvals sit behind a garage. Planning approval is about what can be built on the land — setbacks, site coverage, height, overlays for heritage, bushfire or flooding — and it comes from state planning policy and your council. Building approval is about whether the construction satisfies the National Construction Code, and depending on the state it comes from a private certifier, a registered building surveyor or the council.

Several states allow a small Class 10a building to proceed without planning approval where it meets published limits on size, height, setback and location, and some allow it without a building approval as well. Those limits are set by each jurisdiction and are not the same anywhere, and they typically fall away on heritage-listed land, bushfire prone land and flood-affected land. Check your own state's exempt development rules rather than a rule of thumb heard from a neighbour in another state.

The owner, not the builder, holds the obligation to have a valid approval. Ask to see the document.

What happens where the garage meets the house

Part H3 of Volume Two deals with fire safety in Class 1 and Class 10 buildings, and it provides that compliance with Part 9.4 of the ABCB Housing Provisions satisfies the performance requirement for fire separation of garage-top dwellings. It also provides, for the purposes of the smoke alarm requirements, that a Class 1 building includes a Class 10a private garage located above or below the Class 1 building.

Read together, those two provisions explain why an attached or garage-top build costs more than a detached one. Separating construction has to be built between the garage and the dwelling, the doorway between them is not an ordinary internal door, and the smoke alarm system has to account for the garage rather than stopping at the house wall. None of this applies to a garage standing on its own in the back yard.

It is also the reason that converting an existing attached garage into a habitable room is a much bigger job than it looks: the construction that was separating a car from a house is not the construction required between two habitable spaces.

Building a garage from first measure to handover

  • A site assessment covering levels, drainage, boundary distances, the location of services and whether vehicle access to the street works.
  • A decision, in writing, on detached versus attached, because it drives the classification and everything that follows.
  • Design and engineering, including slab design for the soil classification on your site and wind design for your region.
  • Planning approval if required, then building approval, lodged with drawings and engineering.
  • Locating underground services before any excavation, which is a free enquiry and a routine step that people skip.
  • Site preparation, footings and slab, then frame, roof, cladding and door, with inspections at the stages your certifier nominates.
  • Electrical work by a licensed electrician with the compliance certificate your state requires, and stormwater connected to a legal discharge point.

What goes wrong on garage projects

  • A slab poured without a soil classification, which is how a garage on reactive clay ends up with a cracked floor and a door that no longer closes.
  • Stormwater not designed, so a new roof area discharges against a boundary fence or towards the house rather than to a legal point.
  • Driveway levels that do not work, leaving a car scraping at the apron or a gutter crossing that the council will not approve.
  • A garage built to the boundary without checking the setback, which is the most expensive mistake available on this kind of job.
  • An attached garage built as though it were detached, with none of the separation the Code requires where the two classifications meet.
  • Electrical work done by the builder's labourer rather than a licensed electrician, which leaves you with no compliance certificate and an insurance problem.
  • Ventilation ignored, so an uninsulated metal garage in an Australian summer becomes unusable and everything stored in it degrades.

Where the money actually goes

The garage structure itself is rarely the biggest variable. Site works are: a sloping block needs cut, fill and retaining before anything is built, and that work is invisible in the finished result while being a large share of the outlay. Soil classification drives the slab, and a reactive clay site needs a more substantial slab than a sand site for the same building.

The second big variable is the junction with the house. Detached is cheapest. Attached adds separating construction and the compliance that goes with it. Habitable rooms above turn the project into house construction with a garage underneath, priced accordingly.

The third is access and services: a new driveway and gutter crossing, a stormwater connection, power, and sometimes relocating a service that runs exactly where the slab needs to go. Ask for a quote that itemises site works, slab, structure, door, electrical and stormwater separately, so that you can compare two quotes that are not describing the same job.

Garage Builders: frequently asked questions

Does a garage need council approval in Australia?

It depends on your state and on the garage. Planning approval deals with what may be built on the land and building approval deals with whether the construction meets the National Construction Code, and the two come from different places. Several states allow a small Class 10a building to be built without planning approval where it stays within published size, height and setback limits, and those exemptions commonly disappear on heritage-listed, bushfire prone or flood-affected land. The limits are different in every jurisdiction, so check your own state's rules and ask to see the approval document.

Why is an attached garage more expensive than a detached one?

Because of where the two building classifications meet. The Code classifies a private garage as Class 10a and a house as Class 1a, and Part H3 of Volume Two requires fire separation for garage-top dwellings, satisfied by complying with Part 9.4 of the ABCB Housing Provisions. It also provides that for smoke alarm purposes a Class 1 building includes a Class 10a private garage located above or below it. Separating construction, the doorway between the garage and the house, and the alarm coverage all add cost that a freestanding garage simply does not incur.

Is a carport cheaper than a garage?

Substantially, and for obvious reasons: no walls to speak of, no door, less structure and usually a simpler approval. A carport is also Class 10a. What you give up is security, dust and weather protection from the sides, and the storage space that most households end up valuing more than the parking. If the main purpose is keeping sun off a car in a hot climate, a carport does that job almost as well for a fraction of the outlay.

What determines the slab design?

The soil on your site, more than the building on top of it. A site classification identifies how reactive the ground is, and reactive clay that shrinks and swells with moisture needs a considerably more substantial slab than a sand site carrying the same garage. This is why a quote that prices the slab before anyone has classified the site is not a real quote, and why a garage floor that cracks and a door that stops closing are so often the same problem: the slab was designed for a site that was never tested.

Can I convert my existing attached garage into a room later?

It is possible but it is a bigger job than it looks, and the reason is the construction between the garage and the house. That separating construction was built to keep a car and its fuel apart from a dwelling, and it is not the construction required between two habitable rooms. A conversion also has to deal with floor level, damp, ventilation, insulation, glazing and, in most states, the loss of an off-street parking space, which can be a planning issue in itself. Get advice on the approval pathway before you commit.

Sources

  1. NCC 2022 Volume Two, Part A6 Building classification
  2. NCC 2022 Volume Two, Part H3 Fire safety
  3. NCC 2022 Volume Two, Part H1 Structure

Written by the LokalMatch editorial team. Last reviewed 22 September 2026. How we write and check our guides

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What affects the cost of garage

Prices depend on the details of your project. We only publish price ranges when they’re backed by real LokalMatch quote data or reliable sources. Until then, here’s what usually changes the price:

  • Size and scope of the project
  • Structural changes, such as moving or removing walls
  • Plumbing, electrical and HVAC work involved
  • Finishes and materials chosen
  • Design, drawings and permits
  • Condition of the existing house once it's opened up
  • Access to the site and the timeline

How to compare garage builders before you hire

  • Look for a contractor who has finished projects similar in size and type to yours, and ask to see them.
  • Get a written contract with the scope, the payment schedule, the timeline and how changes will be priced.
  • Ask who will manage the job day to day and how often you'll get updates.
  • Check that they carry liability insurance and workers' compensation coverage, and that their trades are licensed where required.
  • Compare quotes on the same scope, and ask what each one leaves out.
  • For structural changes, make sure an engineer or designer is involved where needed.

Questions to ask garage builders before you hire

  • Who will pull the permits, and who will be there for inspections?
  • Which parts of the job will you do yourselves, and which will go to subcontractors?
  • How do you handle change orders and unexpected problems once walls are open?
  • What is the payment schedule, and what is each payment tied to?
  • Can you show me proof of liability insurance and workers' compensation coverage?
  • What warranty do you offer on your workmanship, and is it in writing?
  • Can I speak with a few of your recent clients?

Garage permits and local rules

Some garage work needs a permit or has to meet local bylaws. Rules vary by municipality, so ask your pro whether a permit is needed and who will apply for it — and check with your city or town if you’re unsure.

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