For a typical single-house property, a carport usually needs a 1m side or rear setback where its assessed boundary-side height is no more than 3.5m and its relevant length is no more than 14m. However, a qualifying carport can have posts on the side boundary if its behind the street setback.
Its front street setback is hald of the primary street setback. In most residential cases that is 3m or 2m.
The tables below show which distance applies in each common case. These are standard R-Code provisions; local planning policies and approved estate plans can change them. Building fire requirements also need to be satisfied.
Carport Setbacks at a Glance
Side and rear boundary setbacks
| Your carport | Standard planning setback |
|---|---|
| boundary-side height up to 3.5m and relevant length up to 14m | 1m |
| boundary-side height up to 3.5m and relevant length over 14m | 1.5m |
| Part B boundary concession: no more than 10m long and 2.7m high, behind the required primary street setback | 0m to the posts, with the roof, eaves and gutters at least 450mm from the boundary |
| Part C boundary concession: less than 10m long, equivalent post height no more than 3m and ridge no more than 4.2m | 0m to qualifying boundary posts, subject to the separate building requirements |
The boundary-post concessions use posts or pillars no larger than 450mm × 450mm. Taller structures, larger supports and solid boundary walls need a different assessment.
Carport Front boundary setbacks
The reduced distances below apply only when the carport meets the street-setback concession conditions explained later.
| Property and applicable rules | Standard primary street setback | Qualifying carport setback |
|---|---|---|
| R20 or R25 | 6m | 3m |
| R30, R35 or R40 single house | 4m | 2m |
| R30 or R35 grouped dwelling | 4m | 2m |
| R40 grouped dwelling | 3m | 1.5m |
| R50 and above single house or grouped dwelling | 2m | 1m |
Measure from the legal property boundary, not the kerb or footpath. The verge is generally outside your property.
These distances come from the standard R-Codes Volume 1 setback provisions.
Which Carport Rules Apply to Your Property?
The main distinction is between Part B and Part C of the R-Codes.
| Your dwelling | Standard code part |
|---|---|
| Single house at R40 or below | Part B |
| Grouped dwelling at R25 or below | Part B |
| Single house at R50 or above | Part C |
| Grouped dwelling at R30 or above | Part C |
That is why an R40 single house and an R40 grouped dwelling can have different carport setbacks, even though both properties have the same density code.
The ordinary 1m and 1.5m Part B examples in this article concern common R20–R40 residential cases. Lower-density properties can have additional rear-setback requirements.
When Does a Carport Need a 1m or 1.5m Side Setback?
A 1m setback under Part B
The standard Table 2a setback is 1m where:
- The relevant boundary-side height is 3.5m or less.
- The relevant length is 14m or less.
- No different applicable provision changes that result.
For example, a 6m-long flat-roof carport with an assessed height of 3m would ordinarily have a 1m side setback under this table.
It would not qualify for the standard Part B boundary-post concession because it exceeds that concession’s 2.7m height limit.
A 1.5m setback under Part B
At an assessed height of 3.5m or less, the standard setback increases to 1.5m where the relevant length exceeds 14m.
Taller structures use different table values.
The assessed height follows the R-Codes measurement rules, including relevant ground levels. It is not necessarily the supplier’s stated post height or the ridge height.
When Can Carport Posts Go on the Boundary?
Part B: up to 10m long and 2.7m high
Under the standard Part B concession, the minimum setback can reduce to 0m at the posts where the carport:
- Is no more than 10m long.
- Is no more than 2.7m high.
- Sits behind the required primary street setback line.
- Keeps its roof, eaves and gutters at least 450mm from the boundary.
Posts or pillars no larger than 450mm × 450mm are excluded from the boundary-wall treatment under the relevant note.
Example: A 6m-long, 2.6m-high carport behind the required front setback line can fit this planning concession. Its posts may be on the side boundary, while its roof and gutters remain at least 450mm inside the property.
The separate fire requirements still need checking.
Part C: less than 10m long, with different height limits
Under Part C, a carport can qualify for boundary posts where:
- Its length is less than 10m.
- Its equivalent height, measured to the top of the posts or pillars, is no more than 3m.
- Its ridge height is no more than 4.2m.
- Boundary posts or pillars are no larger than 450mm × 450mm.
Notice the length difference: Part B allows 10m; Part C requires less than 10m.
Part C does not repeat Part B’s blanket 450mm roof-setback condition in this concession. Roof positioning must still satisfy the applicable building requirements and remain within your property.
How Far Must a Carport Be From the Front Boundary?
The front-setback table above shows the standard distance and the available 50% reduction.
For example:
- R20 under Part B: 6m can reduce to 3m.
- R40 single house under Part B: 4m can reduce to 2m.
- R40 grouped dwelling under Part C: 3m can reduce to 1.5m.
Conditions for the Part B reduction
The carport must:
- Be no wider than 60% of the property frontage.
- Allow an unobstructed view between the dwelling and the street.
- Have a roof pitch, colours and materials compatible with the dwelling.
On a 10m frontage, the width limit for this concession is 6m.
If the carport does not meet these conditions, the 50% reduction is not available under that provision. A different design or planning assessment may be needed.
Conditions for the Part C reduction
Part C also allows a reduction of up to 50%, but its conditions differ.
The carport must meet the dimensional requirements of C3.4.3, stay within the 60% frontage-width limit, and maintain an unobstructed view between the dwelling and the street.
Any portion projecting forward of the primary street setback line must be free of walls, apart from qualifying posts and pillars.
What Is the Carport Setback on a Corner Block?
You need to check the secondary street as well as the front.
- Part B carports: 1.5m from the secondary street.
- Part C at R30 or R35: 1.5m.
- Part C at R40 and above: 1m.
Driveway visibility and corner-truncation requirements also apply.
Setbacks for carport eaves and roofs?
A carport meeting the NCC’s open-carport exemption can avoid certain fire-separation requirements. Its conditions include:
- At least two open sides and one-third of the perimeter open.
- At least 500mm between the adjacent roof covering and the boundary or another building on the same property for a side to count as open.
- Polycarbonate or non-combustible roof covering.
- Non-combustible ceiling lining and wall cladding, where provided.
- No direct vertical support to the house.
- The specified non-combustible infill where it shares the house roof structure without a carport ceiling.
A side with only 450mm roof clearance cannot count as open under that 500mm test. The carport may still qualify through its other open sides.
If the exemption is unavailable, the fire-protection arrangement needs assessment. A 900mm separation is one relevant building-code distance, not an automatic answer for every carport. See the NCC open-carport provisions.
Carport Setback FAQs
Can I put my carport 500mm from the side boundary?
Yes, if a qualifying concession permits a minimum setback of 0m. You do not have to place the posts exactly on the boundary.
If your applicable minimum is 1m, however, a 500mm post setback does not meet that standard.
Can a carport be in front of the house?
Yes. The house may sit farther back than the required street setback line.
For example, if the house is 8m from the front boundary and the required setback line is 6m, a carport at 6m is forward of the house but still at the required setback line.
Can I build a carport on a rear laneway boundary?
Under Part B, a carport can qualify for 0m setback to a communal street or right-of-way that is not its primary or secondary street boundary, with at least 6m of permanently available manoeuvring space immediately in front.
Part C has different laneway provisions. A laneway that provides the dwelling’s primary frontage also needs a separate check.
Can the roof extend over the fence?
The roof and gutters should remain within your property. Permission for boundary posts does not permit construction over neighbouring land. The fence itself may not mark the legal boundary accurately.
