Most carports in New Zealand can be built without a building consent. One up to 20 square metres is exempt outright, and one up to 40 square metres is exempt as long as a Licensed Building Practitioner or a Chartered Professional Engineer is involved.
That is only half the answer. Consent is decided under the Building Act, but where the carport can sit, how close it can come to the boundary and how much of the section it can cover are decided by your council’s district plan. The two are assessed separately, so a carport can be exempt from consent and still breach the plan.
This guide covers both, current as at 2026: which exemption applies at which size, what the Building Code still requires of exempt work, how boundary setbacks are set, and the order to work through it in.
Key Takeaways
- Up to 20 sqm needs no consent, and 20 to 40 sqm needs no consent with a professional involved. A ground-level carport up to 20 square metres is exempt under Schedule 1 exemption 18. Between 20 and 40 square metres it is still exempt if a Licensed Building Practitioner carries out or supervises the work, or a Chartered Professional Engineer designs or reviews it. Over 40 square metres always needs consent.
- Exempt does not mean unregulated. Every carport still has to comply with the Building Code for structure, fire spread, stormwater and durability, and the responsibility for that sits with the owner rather than with a council inspection.
- Boundary distance is set by your council, not by the Building Act. There is no national setback figure for carports. Your district plan sets the yard setbacks, site coverage and height controls for your zone, so the answer changes by suburb.
The Two Rulebooks Every Carport Has to Satisfy
Almost every misunderstanding about carport rules comes from treating “do I need building consent?” as the only question. There are two independent approvals, administered by the same council but under different legislation.
Rulebook | What it controls | What it will not tell you |
|---|---|---|
Building Act 2004 | Whether a building consent is required, and whether the structure meets the Building Code for structure, fire, durability and stormwater. | Where on your site the carport can sit, or how much of the site you may cover. |
District plan (Resource Management Act) | Yard setbacks from boundaries, height in relation to boundary, site coverage, impervious surface limits, and whether a resource consent is required. | Whether the structure is strong enough, or whether a consent is needed under the Building Act. |
An 18 square metre carport can be fully exempt from building consent and still be unlawful because it breaches a side yard or pushes site coverage over the permitted limit. The reverse also happens: a compliant location does not remove the need for a consent on a 45 square metre structure.
Do You Need Consent for a Carport in NZ?
Carports sit in Schedule 1 of the Building Act 2004, the schedule listing building work for which a building consent is not required. Three exemptions can apply, and the deciding factor is ground floor area. All three require the carport to be at ground level.
Floor area | Exemption | Who must be involved | Is Consent required? |
|---|---|---|---|
Up to 20 sqm | Exemption 18 (guidance 8.1) | Anyone, including the homeowner | No |
Over 20 up to 40 sqm | Exemption 18A (guidance 8.3) | Design or construction carried out or supervised by a Licensed Building Practitioner | No |
Over 20 up to 40 sqm | Exemption 44 (guidance 8.2) | Design carried out or reviewed by a Chartered Professional Engineer | No |
Over 40 sqm | No exemption available | Designer and builder as required by the consent | Yes |
The 20 to 40 square metre band is where the government pages are hardest to follow, because the same size range is covered by two different exemptions. The practical reading is simple: you need either an LBP standing behind the build, or an engineer standing behind the design. One or the other is enough.
Both pathways were introduced or extended on 31 August 2020 and remain current. They exist so councils can concentrate consent processing on higher-risk work, which is why the trade-off is professional accountability rather than a council inspection.
How carport floor area is measured
Floor area is the area within the posts or walls supporting the roof structure. A roof overhang beyond the posts is not counted, which is why a carport can shelter more than its stated floor area. It also means a 6 by 6 metre structure is 36 square metres and sits in the 20 to 40 square metre band, not outside it.
What counts as a carport rather than a garage
The Building Code classifies a carport as an outbuilding under clause A1: accessory to the principal use of the site and not intended for human habitation. The distinction that matters in practice is simple.
- A carport is roofed and open. At least one side must remain open to the outdoors at all times. It shelters light vehicles and is commonly attached to or standing near a dwelling.
- A garage is a fully enclosed space, typically with a door. Once the last open side is closed in, the carport exemptions no longer apply.
This catches people out a year or two after the build. Adding a roller door or infilling the last wall is a change of building type, and it is usually the point at which a consent is required. Enclosing a carport, or making significant structural changes to one, should be treated as new building work.
Replacing an existing carport
Repairing or replacing an existing carport can fall under a separate exemption for outbuildings, provided the replacement is comparable, single-storey and not open to the public. Like-for-like replacement is generally fine. Swapping a damaged carport for a garage on the same footprint is not comparable, and a consent is required.
Exempt Still Means Compliant: What the Building Code Requires
A consent exemption removes the council approval step. It does not remove the legal obligation for the work to comply with the Building Code, and if it fails, the owner carries that liability.
Structure (clause B1)
A carport must resist wind and seismic loads acting laterally on the structure, plus vertical loads including snow where the site demands it. Carport structures sit outside the scope of the acceptable solution B1/AS1, particularly where cantilevered elements carry load, so the structural case usually rests on specific engineering design.
Fire spread to boundaries (clause C)
The Building Code limits the spread of fire and transmission of heat across property boundaries. A carport is lower risk than a garage because heat and smoke vent through the open sides, but the closer the structure sits to a boundary the more the fire provisions bite. Low-height walls and lattice or trellis screens are the common way to improve fire performance on a boundary-adjacent side while keeping the structure open, and they also discourage the storage of flammable materials.
Stormwater (clause E1)
A carport roof is new impervious area, and runoff from a larger carport is significant. Stormwater must be collected and discharged so it does not create a risk to neighbouring land, buildings or structures, which in practice means gutters, downpipes and a connection your council will accept. Stormwater work relating to the carport is included in the exemption, but the compliance obligation remains.
Durability (clause B2)
Structural elements must remain serviceable for the required durability period. In coastal, geothermal and high-wind zones this drives steel grade, coating and fixing specification, which is why a durability statement is worth asking for before you order.
Kitset Carports and the Exemption
Under exemptions 18A and 44, the professional input has to be real and documented. For a kitset or pre-manufactured carport, that usually means the supplier’s design has already been verified by a Chartered Professional Engineer for your wind and snow zone.
A producer statement, commonly a PS1, is the standard way to demonstrate that a kitset design complies with clause B1, particularly where the structure is designed by an engineer using B1/VM1. If a supplier cannot produce engineering for your zone, the exemption pathway shifts onto you to arrange, either through an LBP build or an engineer’s review.
Two questions to ask any supplier before you rely on an exemption:
- Is the design engineered for my wind and snow zone, and can I see the documentation? A structure engineered to a national average is not the same as one engineered to a very high wind zone.
- What durability and warranty position comes with it? This is what tells you whether the structure will still satisfy clause B2 in twenty years.
Streamline carports are all-steel, engineered for New Zealand conditions including very high wind zones, and use the PurlinDek roofing profile, which spans up to 6 metres without support. They carry a 25-year durability statement and a 15-year warranty, and PS1 documentation is available so the exemption pathway is documented rather than assumed.
How Close to the Boundary Can You Build a Carport?
There is no national answer, and that is not evasion. The Building Act sets no boundary distance for carports. The distance is set by your council’s district plan, and it varies by zone within a single city.
Four district plan controls do the work:
- Yard setbacks. A minimum distance from front, side and rear boundaries. Side and rear yards of around 1 to 1.5 metres are common in residential zones, with a deeper front yard. Some plans allow accessory buildings closer to a side or rear boundary where they stay under a stated height and wall length, and some allow a reduced setback with the written approval of the affected neighbour.
- Height in relation to boundary. Also called a recession or daylight plane. An imaginary sloping plane rising from the boundary that the structure must sit under. Carports are low, so this rarely governs, but a high-clearance structure can breach it.
- Building coverage. The proportion of the site that may be covered by buildings. A carport counts towards it, and on a small site already carrying a house and a garage this is the control most likely to fail.
- Impervious surface limits. A separate cap on hard surfaces in some plans, relevant where the carport comes with a new concrete slab or extended driveway.
Overlays sit on top of these: heritage and special character areas, natural hazard and flood overlays, coastal environment, significant trees and infrastructure setbacks such as overhead lines. An overlay can restrict a location the underlying zone permits.
Two non-council constraints catch people out just as often. A registered covenant on the title can prohibit accessory structures or dictate materials and colours, and it is enforceable regardless of council approval. A sewer, water or stormwater line running under the proposed footprint will usually need a build-over approval from the network utility, or a shift in the post layout.
Why the rules change from council to council
The consent exemptions are national and identical everywhere. The planning rules are not. Every territorial authority writes its own district plan, so the same 24 square metre carport can be a permitted activity in one suburb and require a resource consent two council boundaries away. Zone, medium density standards, wind and snow zone and council interpretation of attached structures all vary.
The reliable move is a property-specific check rather than a general answer. Most councils publish a property search that returns your zone, overlays and the relevant standards, and most will confirm in writing whether a proposed carport is a permitted activity.
The Practical Steps, In Order
- Set the footprint. Decide the size you need in square metres measured within the posts, then check it against the 20 and 40 square metre thresholds. A single carport typically sits under 20 square metres; a double usually lands in the 20 to 40 band.
- Check your zone and overlays. Use your council’s property search to pull the zone, yard setbacks, building coverage limit and any overlays affecting the site.
- Test the location on paper. Mark boundaries, existing buildings, services and the proposed footprint on a site plan. Confirm the setbacks and recalculate site coverage with the carport included.
- Check the title. Look for covenants, easements and rights of way that restrict accessory buildings or run under the footprint.
- Confirm the exemption pathway. Up to 20 square metres you can proceed. Between 20 and 40 square metres, decide whether an LBP or a Chartered Professional Engineer will carry the design or construction, and get it in writing.
- Get the engineering for your zone. Ask the supplier for structural documentation sized to your wind and snow zone, plus a durability statement. Keep it with your property records.
- Confirm with council in writing. Even where no consent is required, written confirmation that the work is exempt and the location is a permitted activity is the record you will want at sale time.
- Sort stormwater before you build. Confirm where roof water will discharge and that the connection is acceptable to council.
Keep every document. Without a consent, there is no council record of the structure, so your file is the only evidence the work was exempt and compliant.
What Happens If You Get It Wrong
Building work that needed a consent and did not get one can attract a notice to fix. The remedy is usually a certificate of acceptance, a retrospective council assessment of work it never inspected. It costs more than a consent would have, it is discretionary, and council may require parts of the structure to be opened up or removed to be assessed.
A structure that breaches the district plan is a separate problem: it can require a retrospective resource consent, a neighbour’s approval, or physical relocation. Either way, the record surfaces on the LIM report, and unconsented or non-complying structures are a standard point of negotiation, price adjustment or delay in a residential sale.
Getting It Right the First Time
Carport rules look complicated because two sets of them apply at once, but the sequence is short. Size decides whether you need a building consent. Your council’s district plan decides where the carport can go. The Building Code applies either way, and the paperwork is what proves it.
Settle the footprint first, because the 20 and 40 square metre thresholds do most of the work. Check the zone and the title before you commit to a location, since a boundary setback or a site coverage limit is far cheaper to design around than to fix afterwards. If the carport lands between 20 and 40 square metres, confirm in writing who is carrying the exemption, whether that is an LBP on the build or an engineer on the design. Then keep every document, because with no consent on file your own records are the only evidence the work was exempt and compliant when a buyer’s solicitor asks.
Do that in order and a carport is one of the simplest additions you can make to a property. Skip a step and it becomes a certificate of acceptance, a retrospective resource consent, or a line item in a sale negotiation.
Next Steps:
- Work out your footprint. Measure the area within the posts and check it against the 20 and 40 square metre thresholds. Single and double kitset sizes, the 2.1 metre standard height and the extra-height option are on the carport range page.
- Check the engineering behind the exemption. PurlinDek spans, load compliance and durability, which is what a 20 to 40 square metre exemption relies on.
- Look at completed installations. Builder-installed and customer-installed carports across New Zealand, for sizing and siting ideas.
- Send us your site details. Dimensions, location and wind zone, and we will confirm the structure and the documentation you will need for your council.
Carport Consent FAQs
Do I need consent for a carport in NZ?
Not if it is at ground level and no more than 20 square metres in floor area, under Schedule 1 exemption 18. Between 20 and 40 square metres it is still exempt provided a Licensed Building Practitioner carries out or supervises the design or construction, or a Chartered Professional Engineer designs or reviews it. Above 40 square metres a building consent is always required. In every case, the district plan rules and the Building Code still apply.
How close to the boundary can I build a carport?
There is no national figure. The minimum distance comes from your council’s district plan yard setbacks for the zone, commonly around 1 to 1.5 metres to side and rear boundaries in residential zones, with a deeper front yard. Some plans allow a reduced setback with the written approval of the affected neighbour, or allow accessory buildings closer where they stay under a stated height and wall length. Building Code fire provisions also become more demanding close to a boundary. Check your zone before you fix the location.
What size carport can I build without consent?
Up to 20 square metres with no professional involvement, and up to 40 square metres with an LBP or Chartered Professional Engineer involved. Floor area is measured within the posts or walls supporting the roof, so a 6 by 6 metre carport is 36 square metres and needs the professional pathway.
Does a carport need consent if it is attached to the house?
Attachment does not change the exemption. Since a 2016 amendment the carport exemptions apply to both free-standing and attached carports. What attachment does change is the technical risk: fixing into an existing wall or roof affects weathertightness and the structural behaviour of the existing building, and both need to be handled properly.
Do I need consent to convert a carport into a garage?
Usually yes. Adding walls and a door changes the structure and brings it under different Building Code requirements for fire safety, ventilation and structural stability. Small conversions under 20 square metres with minimal change may qualify for an exemption, and like-for-like repairs generally do, but assume consent is needed and confirm with council before starting.
Does a carport count towards site coverage?
Yes, in most district plans a roofed structure counts towards building coverage. On a site already close to its coverage limit this can be the binding constraint even where the carport is well under 20 square metres.
Do I need a resource consent as well?
Only if the carport breaches a district plan standard, for example a yard setback or the coverage limit. If it complies with every relevant standard it is a permitted activity and no resource consent is needed.
Is a carport the same as a pergola or a shade sail?
No. Pergolas and shade sails sit under different Schedule 1 exemptions with different conditions. A carport is a roofed structure for vehicle storage with at least one open side.