Building Work You Can Do in Auckland Without Consent

Last reviewed: July 2026 · How we research these costs · Council rules: Auckland Council

People ask me all the time whether they need to ring council before they touch anything on their section, and the answer catches a lot of Henderson homeowners off guard: a solid chunk of everyday renovation work is exempt from a building consent under the Building Act. I’m Dave, I’ve spent close to eighteen years on the tools building and renovating houses across West Auckland — Henderson, Sunnyvale, Ranui, out to Te Atatū — and this exemption list is one of the things I get asked about more than almost anything else. Here’s the trap: “no consent needed” almost never means “no rules at all”. Get that distinction wrong and you can end up ripping out work that never actually complied, so it pays to know exactly where the line sits.

This guide walks through the jobs that are usually exempt, where the exemption quietly stops, how the Building Code and the Auckland Unitary Plan still apply even when a consent doesn’t, and what it costs when someone gets it wrong. Treat every size and height figure here as indicative — the list gets updated, so the current council schedule is always the authority for your own job.

The jobs I don’t need to ring council for

Schedule 1 of the Building Act is the list that actually matters, and it covers more of the work I get called out for than most owners expect. This is what I treat as consent-free, with the limits that come attached:

Job	Limit	Condition
Detached shed or sleepout	Up to 30 m², single storey	Built or supervised by a Licensed Building Practitioner
Deck	Under 1.5 m above ground	—
Fence or garden wall	Up to 2.5 m	—
Retaining wall	Up to 1.5 m	No extra surcharge load
Repair or replacement	—	Comparable materials (e.g. re-cladding rotten weatherboard, same-profile roof)
Internal non-structural work	—	New kitchen layout, relining, vanity swap

That table isn’t the whole list, and it gets updated — check it on the Building Performance site before you plan a job around it. I’ve had clients tell me a shed was fine because “the neighbour built one in 2015,” and that’s exactly the kind of assumption that gets people into trouble.

The pattern behind that list is worth understanding. Parliament exempted the work that’s either low-risk or easy to put right if it goes wrong — repairs with comparable materials, small detached structures, low decks and fences, and interior work that doesn’t touch the bones of the house. The moment a job climbs higher, spans further, carries more load, or ties into plumbing, drainage or structure, it drifts back toward needing a consent.

Exempt or consent-required: where the line usually falls

Owners always want the one-line version, so here’s roughly how the common jobs tend to split. Treat this as a rule-of-thumb summary of the same Schedule 1 logic, not a replacement for it — the exact limits live in the current schedule, and the right-hand column kicks in the moment a job crosses one of them.

Type of work	Usually exempt when…	Usually needs consent when…
Deck	It sits low enough above the ground to fall within the schedule	It’s raised higher, carries a roof, or ties into the house structure
Detached shed or sleepout	Small, single-storey and within the floor-area limit, built or supervised by an LBP	It’s over the size limit, or has plumbing the exemption doesn’t cover
Fence or garden wall	It’s below the height limit in the schedule	It’s taller, or it’s a swimming-pool barrier, which has its own separate rules
Retaining wall	It’s low and carries no extra surcharge load	It’s higher, or a driveway or building above adds load to it
Repair or replacement	It’s like-for-like using comparable materials	You change the material or alter the structure while you’re at it
Interior work	It’s non-structural — relining, a new kitchen layout, a vanity swap	You move or remove a load-bearing wall, or alter the drainage

It’s height, size, load, structure and plumbing that push a job from the left of that table to the right. When one of mine sits close to an edge, I stop guessing and read the current schedule for the exact figure — “close enough” is precisely where people come unstuck.

Consent-free doesn’t mean code-free

This is the bit that trips people up on nearly every job I look at. Even when a consent isn’t required, the work still has to meet the Building Code. A consent-free deck still has to be structurally sound. Consent-free plumbing and drainage still has to be done by a properly licensed tradesperson. If you sell the house down the track, a LIM or a sharp buyer’s builder will flag anything that doesn’t stack up, and you may be the one paying to fix or remove it. “I didn’t need a consent” doesn’t hold up if the work itself is substandard.

I see this most with decks and retaining. A low deck that skips a consent still has to hold a summer barbecue full of people; an exempt retaining wall still has to actually retain the ground behind it. Exempt only means council isn’t there to check it for you — the standard hasn’t dropped an inch, and you’re now the only set of eyes making sure it’s met.

Where Henderson’s own rules bite harder than the Building Act

The national exemptions are only half the story. The Auckland Unitary Plan sits on top of them, and a job that needs zero building consent can still need a resource consent. Around Henderson and the wider West Auckland foothills you run into overlays for flooding, overland flow paths, significant ecological areas and heritage — a shed that’s fine under Schedule 1 can still breach height-to-boundary or site coverage rules under the Unitary Plan. Our reactive clay soil is the other thing I watch for: even a “simple” retaining wall or slab can move if it’s not designed for the ground it’s sitting on, which is exactly why that 1.5 m retaining limit exists rather than something more generous.

Protected and scheduled trees catch people too. Building near one can trigger a consent even when the structure itself is exempt, so if there’s a big tree anywhere near the work, check the overlays before you order materials.

If your section carries any of those overlays — and plenty of the older West Auckland streets do — the Unitary Plan can decide the job before the Building Act gets a look in. Check your address on the council’s Unitary Plan viewer and confirm the current position with Auckland Council before you commit to a design.

What getting it wrong actually costs

Skipping a consent you genuinely needed is the expensive path, not the cheap one:

Scenario	Typical cost
Certificate of Acceptance (applied for after the work is done)	$3,000 – $8,000
Standard building consent for a minor structure (fees + inspections)	$1,500 – $4,000

A Certificate of Acceptance often means opening up finished work to prove it complies, on top of the extra inspections. Doing it right the first time is nearly always the cheaper road.

And that’s only the council side. If unconsented work turns up on a LIM when you’re selling, buyers get nervous and banks get cautious while you sort it out — I’ve watched a settlement stall over a sleepout that would have been straightforward to consent at the time. The shortcut that looked cheap on the day has a habit of turning up years later with interest.

The assumptions that catch homeowners out

Nearly every job I’ve had to unpick started with a reasonable-sounding assumption. Here are the ones I hear most, and why they don’t hold:

• “The neighbour did it.” Someone else’s shed being fine tells you nothing about your section, your overlays, or the rules as they stood the year they built.
• “It’s only small.” A structure can be well under a size limit and still trip a boundary setback or a height-to-boundary line under the Unitary Plan.
• “It’s just a repair.” Like-for-like is exempt, but the moment you upgrade to a different material or shift something, it counts as new work.
• “The sleepout’s just for guests.” As soon as it has a sink, shower or toilet, plumbing and drainage rules come into play regardless of the floor area.
• “We’ll sort the paperwork later.” A Certificate of Acceptance after the fact is dearer than a normal consent and isn’t guaranteed to be granted.

How I check a job before I put a spade in the ground

• Measure the exact job — a lot of these exemptions hinge on precise size and height limits, not roughly right.
• Check Schedule 1 for the building consent side of things.
• Check the Unitary Plan viewer for your specific address, for overlays that trigger a resource consent.
• If in doubt, ask council or a Licensed Building Practitioner before you start, not after. If the project turns out bigger than you first thought, it’s worth understanding the full 2026 consent process before you commit.

My rule of thumb after eighteen years of this: exemptions cover repairs, small detached structures and low-risk work. Anything structural, anything touching waterproofing, fire safety or drainage, and anything near a boundary or a hazard overlay earns a proper check before the tools come out.

Questions I get asked on site

Can I build a sleepout in my Henderson backyard without consent? Sometimes. A detached, single-storey building up to 30 m² can be exempt if it’s built or supervised by a Licensed Building Practitioner and meets the conditions, including plumbing rules if it has facilities. You still need to check Unitary Plan rules on site coverage, height and setbacks, which can stop the project regardless of the building exemption.

Does replacing my kitchen need consent? A like-for-like kitchen replacement that doesn’t move walls or alter structure generally doesn’t need building consent. Relocate the sink, alter the drainage, or knock out a load-bearing wall, though, and that changes things — the plumbing and any structural change are usually where the line falls.

What if I already did work that needed consent? You can apply for a Certificate of Acceptance, council’s way of assessing work after it’s built. It’s not guaranteed to be granted, it usually costs more than a normal consent, and you may have to expose finished work for inspection. Still far better than leaving unconsented work sitting on the record when you come to sell.

Do I need a building consent to build a deck? It depends on how high the deck sits above the ground. A low deck can be exempt under Schedule 1, but once it’s raised higher, carries a roof, or ties into the house structurally, a consent is usually required. The trigger height is the kind of figure that gets adjusted over time, so check the current schedule for your own deck rather than relying on a number you half-remember.

Can I put up a fence or a low retaining wall without consent? Often, yes. A fence or garden wall up to the height in Schedule 1, and a low retaining wall that carries no extra surcharge load from a driveway or building above it, are commonly exempt. Go taller, add a load, or build a swimming-pool barrier — which has its own separate rules — and the position changes. Confirm the current limits before you dig the post holes.

Before you plan any job around an exemption, check the current Schedule 1 for the building-consent side and your address on the Auckland Unitary Plan viewer for the resource-consent side. If those two don’t give you a clear yes, a quick word with council or a Licensed Building Practitioner beats an expensive fix later.