Deck vs Patio: Which Suits Your Auckland Home?
Quick answer: Deck vs patio in Auckland comes down to your floor height: a raised timber floor suits a deck, while a slab-on-ground house can take a patio only if it keeps the cladding and floor clearances, drains away from the walls and fits your site’s paving limit.
Open the ranch slider, step outside and look down. If you’re stepping down 400 or 500 mm onto the lawn, the question has mostly answered itself, because a deck can run out level with your living room and a patio can’t. If you’re stepping down a few centimetres onto the grass, a patio looks like the obvious, cheaper choice.
But that’s exactly the house where a patio laid in the wrong place lets water under the door, puts the bottom of the cladding in the splash zone and counts against a paving limit most people have never heard of. The material comes later. The house decides first, and if you want to sit out there when it’s raining, the roof over it is the decision after that.
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Start With Your Floor Height, Not the Material
Every outdoor living area has to meet the house at the door. That join is where water tries to get in, where people trip and where most of the cost hides, so it’s the first thing to look at.
Houses on piles: villas, bungalows and most weatherboard homes
Older New Zealand houses were built on suspended timber floors: floorboards on joists and bearers, sitting on piles with a crawl space underneath. BRANZ’s article on level threshold access describes how front doors on these homes traditionally meant steps up from the ground, and how timber decks then became part of the Kiwi way of living outside because they could bring the outdoor surface up to the floor.
On a house like this, the deck has the natural advantage. A deck is a structure in its own right, so it can be built to whatever height the floor needs, and BRANZ notes that level entry from a free-draining timber deck was achievable with minimal risk of water getting inside. The gaps between the boards let rain fall straight through instead of pooling against the door.
A patio on the same house has to sit on the ground. If the floor is half a metre up, you either accept steps down from the door onto the patio, or you build the ground up with fill, retaining and a set of stairs, at which point you’re paying for a structure anyway. On a villa in Grey Lynn or a bungalow in Mt Eden with the floor well above the lawn, a deck is usually the only way to get a genuinely level step from the living room to the outdoor area.
💡 Quick tip: Not sure which floor you have? Walk round the outside. Subfloor vents, a timber or board skirt and a crawl space mean a suspended floor. A concrete edge running round the base of the walls with the cladding starting just above it usually means a slab.
Slab-on-ground houses: the clearance problem
Over time, BRANZ explains, New Zealand houses moved to reinforced concrete slab-on-ground floors, and the difference between the outside ground and the inside floor shrank. Many of these homes got concrete patios instead of decks, sometimes tiled, because the floor was close enough to the ground to make a patio look like the natural fit.
This is where the rules start to bite. According to BRANZ, the general minimums in NZS 3604:2011, the standard for timber-framed buildings, are 150 mm between the floor and permanent paving, or 225 mm above unpaved ground. The same article sets out that the cladding must finish at least 100 mm above an outside paved surface, and that the base of the cladding has to extend 50 mm below the internal floor level.
Put those numbers together and you can see the trap. Imagine a slab house where the lawn currently sits 200 mm below the floor. Lay a 100 mm thick patio on top of the lawn and you’re down to roughly 100 mm between the patio and the floor, under the 150 mm minimum for paving. The bottom edge of the cladding, which hangs 50 mm below the floor, would now be about 50 mm off the paving instead of the 100 mm it needs. Rain bouncing off the hard surface hits the base of the wall, and a heavy downpour has a much shorter climb to the door sill.
None of that shows up on the day the concrete is poured. It shows up years later as swollen bottom plates, stained carpet by the slider, or a weathertightness question from a buyer’s inspector. On a slab house, the patio’s finished level is the most important number in the whole job.
When you want the patio level with the floor
Level access to a patio from a slab house can be done, and done properly. BRANZ describes the solution in E2/AS1 paragraph 7.4.2, the Acceptable Solution for external moisture: a drained channel across the door opening, no longer than 3,700 mm, at least 200 mm wide and 150 mm deep, with a minimum fall of 1:200 to a sump connected to the stormwater system. The patio itself then needs a minimum fall of 1:40 away from the channel, in line with the Building Code’s surface water clause.
That detail costs more than a plain slab and needs to be designed at the start, not added once the concrete is down. It also only solves the doorway. Elsewhere along the wall, the 100 mm cladding clearance still has to hold. If a level patio is what you want, this is the conversation to have with whoever designs it, and it’s covered in more depth in Sonder Architecture’s guide to designing a deck around the level change at your door.
💡 Quick tip: Before anyone quotes a patio, measure from the inside floor level to the ground outside the door. Under about 250 mm, ask how the quote keeps the 150 mm floor clearance and the 100 mm cladding clearance once the patio is laid.
Deck or patio at a glance
| Question | Deck | Patio |
|---|---|---|
| Best match for | Raised floors on piles, sloping sections | Slab houses with room to keep the clearances, flat ground |
| Level step from the living room | Yes, built to floor height and free-draining | Only with a designed drainage channel at the door |
| Barrier needed | Where people could fall 1 m or more | Only if it sits above a drop of 1 m or more |
| Building consent | Exempt where a fall of more than 1.5 m is not possible, even if it collapses | Ask council about any associated drainage or retaining |
| Unitary Plan impervious area | Slatted decks are excluded | Patios are included, unless the paving is porous or permeable |
| Our published price | From around $8,000-$12,000 installed for basic pine, 10-15 m² | No single figure; quoted on the site |
Deck vs Patio Rules: Consent, Barriers and the 1 m to 1.5 m Gap
Ask most people whether a deck needs consent and they’ll say “not if it’s under 1.5 metres”. That’s roughly right, and it’s also where the most common deck mistake in Auckland starts, because the height that triggers consent and the height that triggers a safety barrier aren’t the same number.
The 1.5 m consent exemption
Schedule 1 of the Building Act 2004 lists work that doesn’t need a building consent. Clause 24 covers building work in connection with a deck, platform, bridge, boardwalk or the like “from which it is not possible to fall more than 1.5 metres even if it collapses”.
Read the last four words twice. The test isn’t the height of the deck boards above the lawn where you happen to measure. It’s the worst fall anyone could have from the deck, including the case where it gives way. On a sloping Titirangi or Glendowie section, a deck that sits 600 mm off the ground at the house end can easily be 1.8 m up at the far edge, and that far edge is the one that counts.
A patio sitting on the ground has no fall to measure, which is part of its appeal. But a patio is rarely only a patio on a sloping site: once the ground is cut and filled to make it level, retaining walls and drainage come into it, and those carry their own rules under Schedule 1 and the Building Code.
The 1 m barrier rule
Clause F4 of the Building Code deals with safety from falling. Its performance requirement F4.3.1, in the Building Regulations 1992, says a barrier must be provided “where people could fall 1 metre or more from an opening in the external envelope or floor of a building, or from a sudden change of level within or associated with a building”.
So there’s a band between 1 m and 1.5 m where a deck can be exempt from consent and still need a barrier. A deck that’s exempt from consent at 1.3 m still needs a compliant barrier, and the exemption doesn’t excuse leaving it off. Section 17 of the Building Act is blunt about it: all building work must comply with the Building Code “whether or not a building consent is required”.
Imagine a family in a Howick house with a deck that runs 1.2 m above a paved path at one corner. Nobody needed a consent to build it, so nobody from council ever looked at it, and the open edge is exactly where a toddler or a guest who’s had a couple of drinks goes over. F4 exists for exactly that edge, which is why we treat the barrier as part of the deck’s design rather than an optional extra.
Important note: This is general information, not consent or Building Code advice for your property. Whether your deck, patio, steps or barrier need a building consent, and what a compliant design looks like, is a question for Auckland Council or a Licensed Building Practitioner who has seen the site.
Exempt still means Code-compliant
Exempt work skips the consent paperwork. It doesn’t skip the standards. A consent-exempt deck still has to be durable, safe and weathertight where it meets the house. In practice that means the right timber treatment, fixings that suit the exposure, a ledger or junction detail that won’t trap water against the wall, and a barrier where the fall is 1 m or more.
It also means there’s no council inspection to catch a mistake, so the quality of the builder matters more on exempt work, not less. When we build a deck, our in-house Licensed Building Practitioner (LBP #BP156911) provides oversight on process, documentation, workmanship and compliance, consent or no consent.
💡 Quick tip: Measure the highest possible fall, not the average height. Run a string line from the deck edge to the lowest ground beneath it on the downhill side: that’s the number that decides both the barrier and the consent question.
Where the Rain Goes: Surface Water and Auckland’s Paving Limit
A slatted deck lets water fall through to the ground beneath it. A patio sheds every drop sideways, and that water has to go somewhere that isn’t your house or your neighbour’s.
Falling away from the house
Clause E1 of the Building Code covers surface water. It requires surface water from a storm with a 2% chance of happening in any year not to enter buildings (for housing), and it requires water from a 10% annual-probability event that’s collected or concentrated by buildings or sitework to be disposed of in a way that avoids the likelihood of damage or nuisance to other property.
A big hard patio is sitework that collects water. It needs to fall away from the house, and BRANZ’s description of the E2/AS1 level-threshold detail gives 1:40 as the minimum fall away from the door channel. Over a 4 m wide patio, 1:40 is a 100 mm drop from the house edge to the garden edge. On a flat section, that water then has to soak in, run to a drain or reach the stormwater system without pooling against the boundary fence.
A timber deck has a different water story. Rain goes through the gaps onto the ground underneath, which should be shaped to drain, and the deck’s job is to stay off the house wall far enough for the junction to dry out. That doesn’t make decks maintenance-free, but it does mean you aren’t building a new catchment beside your walls.
Patios count, slatted decks don’t
This is the rule most homeowners have never heard of, and it can decide the question outright on a small or already-paved site. The Auckland Unitary Plan’s definitions describe an impervious area as a surface that “prevents or significantly retards the soakage of water into the ground”. The definition includes roofs and paved areas, and it names driveways, parking areas and patios. It excludes, among other things, porous or permeable paving and slatted decks.
That matters because residential zones cap impervious area. In the Mixed Housing Suburban zone, standard H4.6.8 in the Unitary Plan’s zone rules (July 2026 version) says the maximum impervious area must not exceed 60% of the site, and no more than 10% of a riparian, lakeside or coastal protection yard. The zone chapter is marked with pending Plan Change 120 modifications, so check the current rule for your own zone before you plan around it.
On a 600 m² section, 60% is 360 m². The house roof, the driveway, the paths and the garage slab all come out of that. A new 30 m² concrete patio counts against the impervious limit; a 30 m² slatted deck doesn’t. If your site is already close to the limit, a patio could tip it over and turn a simple job into a planning question for council, while a deck might not move the needle at all. How the limits apply to your particular zone and site is planning territory, the kind of question Sonder Architecture’s architectural designers work through at design stage.
💡 Quick tip: If you love the look of a patio but the site is tight on impervious area, ask about permeable paving. The Unitary Plan’s definition excludes porous or permeable paving from impervious area, though it still has to be laid to suit the ground and your zone’s rules.
Building coverage and a roof over the top
There’s a second Unitary Plan measure, building coverage, and here decks and patios behave alike while they’re open to the sky. The definition of building coverage excludes uncovered decks and pergolas. Put a solid roof over either one and you’re into a different conversation, which we come back to below.
What a Deck or Patio Costs, and What It Asks of You Later
So which is cheaper? The usual online answer is that a patio wins on price. In Auckland, on the houses we work on, it depends on whether the patio needs fill, retaining, a drainage channel and a stormwater connection to do the job properly, and whether the deck needs to be 400 mm high or 1.4 m high with a barrier.
The deck prices we publish
Our answers on deck and outdoor renovation pricing give these figures for a new Auckland deck: a basic pine deck (10-15 m²) starts from around $8,000-$12,000 installed; a mid-range kwila or hardwood deck of the same size typically costs $15,000-$25,000; and a premium composite decking installation with integrated lighting and framing starts from $20,000-$35,000. Large decks, multi-level designs and decks that need consent cost more.
Time on site is shorter than most people expect. The same FAQ puts a standard deck of up to 25 m² at one to two weeks to build once the materials are on site, and warns that kwila timber lead times can add four to eight weeks to the start date. If you want to be out there by summer, order early.
Why we don’t publish a patio price
We don’t publish a single patio figure, and we’d be suspicious of anyone who did without seeing the site. A patio on flat, well-drained ground beside a house with plenty of clearance is one job. The same square metres beside a slab house with 180 mm of clearance, on clay, with a downhill neighbour, is another: it might need the ground lowered rather than built up, a channel drain at the door and a new stormwater connection. The surface you see is the cheap part. What’s underneath and at the house edge is where the money goes.
What we can say honestly is that the comparison isn’t patio versus deck per square metre. It’s the full cost of getting each one to meet your house properly. On a raised-floor home, that usually favours the deck. On a slab home with generous clearance and room under the impervious limit, the patio often comes out ahead.
Upkeep over 20 years
Maintenance is where the two really part ways. According to our FAQ, a kwila deck in Auckland can last 25 to 40 years with proper maintenance, which means oiling once or twice a year. Composite decking requires virtually no maintenance, won’t rot or splinter and holds its colour, but the FAQ also puts it at 30-60% more to install than kwila. If you’re weighing that trade-off, our guide to what composite decking’s warranty does and doesn’t cover goes through the details, including the timber frame underneath the boards.
A well-built patio asks less of you: keep the falls clear, keep the drain at the door free of leaves and stop the garden from creeping up against the cladding. That last one is easy to miss. Every layer of bark or topsoil you add along the house edge eats into the clearance the builder left you.
💡 Quick tip: Whichever you build, ask for the finished levels in writing: floor, outdoor surface and the bottom of the cladding. It’s three numbers, and it’s the easiest way to check the clearances were kept.
Covering It, and How We Help You Decide
Auckland’s weather is the reason so many decks and patios sit empty half the year. A roof over part of the area changes that, and it’s worth deciding before you build, because a roof needs posts and footings, and those are easier to plan into the surface than to cut into it later.
Pergola or veranda
Schedule 1 of the Building Act treats these differently. Clause 6 exempts building work in connection with a pergola. Clause 17 exempts a porch or veranda that’s on or attached to an existing building, at the ground or first-storey level, no larger than 20 m² in floor area and not overhanging an area the public can access. Clause 17A covers a porch or veranda of more than 20 m² and up to 30 m² at ground level, where an LBP carries out or supervises the design or construction.
Which category a roofed structure falls into, and whether yours needs consent, is a question for council or your LBP. What matters for the deck-or-patio decision is that the covered area needs to drain too: the roof’s water lands somewhere, and on a patio it lands on a hard surface that’s already shedding water. Our guide to pergola roofs, materials and wind zones covers the options, and the pergola calculator gives you a starting range.
A real example from Cockle Bay
A deck doesn’t have to be a project on its own. In Cockle Bay, finished in October 2019, we rebuilt the Kwila deck off the back of the house and extended it while upgrading the upstairs ensuite and laundry, with one project manager running the whole job. The project page for that East Auckland deck and ensuite job shows how the outdoor and indoor halves fitted together.
How we work out which one fits
When we look at an outdoor area, we start where this article started: the floor level, the ground level and the bottom of the cladding. Then we check the fall across the site, where the water will go, how much of the section is already hard surface and whether the area will be covered. Only then do we talk timber, composite, concrete or pavers. It’s the same order whether you end up with a deck, a patio or a mix of both, such as a deck at the door stepping down to a paved area further out.
Our team that designs and builds decks, patios and covered outdoor areas works on a fixed price. As our process page puts it, you’ll know the price, the timeline and exactly what’s included before any work starts. We’ve completed more than 1,000 Auckland renovations since 2017, and on outdoor work the house edge is where we spend the most time at the design stage.
💡 Quick tip: If you’re renovating inside as well, plan the outdoor area at the same time. Changing a window to a slider, or a slider to bifolds, sets the threshold height the deck or patio has to meet.
So, Deck or Patio?
If your floor sits well above the ground, build a deck: it’s the only way to get a level step outside without fighting the house. If you’re on a slab with the clearances to spare, a flat site and room under your impervious limit, a patio is often the better buy. If you’re on a slab and want the patio level with the floor, that can be done, but only as a designed detail. Measure the floor-to-ground height this weekend, and you’ll know which conversation you’re having. Call us on 0800 199 888 if you’d like us to look at it with you.
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Is a deck or a patio better in Auckland?
It depends on your floor height. A house on piles with the floor well above the ground suits a deck, because a deck can be built level with the floor and drains through its gaps. A slab-on-ground house can take a patio if the patio keeps the floor and cladding clearances, falls away from the walls and fits within your zone limit on impervious area.
Is a patio cheaper than a deck in NZ?
Often, but not always. A patio on flat, well-drained ground beside a house with plenty of clearance is usually the cheaper surface. Once a patio needs fill, retaining, a drainage channel at the door or a new stormwater connection, the gap closes. Our FAQ puts a basic pine deck of 10-15 m² from around $8,000-$12,000 installed; we quote patios on the site.
How much does a deck cost in Auckland?
Our renovation FAQ gives these guides: a basic pine deck of 10-15 m² starts from around $8,000-$12,000 installed; a mid-range kwila or hardwood deck of the same size typically costs $15,000-$25,000; and a premium composite installation with integrated lighting and framing starts from $20,000-$35,000. Large decks, multi-level designs and decks that need consent cost more.
Do I need a building consent for a deck in NZ?
Schedule 1 of the Building Act exempts a deck from which it is not possible to fall more than 1.5 metres, even if it collapses. Measure the worst fall, usually the downhill edge, not the average height. Exempt work must still comply with the Building Code. Confirm your own deck with Auckland Council or a Licensed Building Practitioner before you build.
When does a deck need a balustrade?
Building Code clause F4.3.1 requires a barrier where people could fall 1 metre or more from a change of level associated with a building. That is lower than the 1.5 metre consent exemption, so a deck can be exempt from consent and still need a compliant barrier. The barrier design itself is a question for your builder or a Licensed Building Practitioner.
How close can a patio be to my floor level?
BRANZ notes that NZS 3604:2011 sets general minimums of 150 mm between the floor and permanent paving, or 225 mm above unpaved ground, and that cladding must finish at least 100 mm above a paved surface. A patio laid too high closes those gaps. Level access is possible with a designed drainage channel at the door, as E2/AS1 describes.
Does a patio count towards impervious area in Auckland?
Yes. The Auckland Unitary Plan defines impervious area to include paved areas such as driveways and patios, and excludes slatted decks and porous or permeable paving. Residential zones cap impervious area: in the Mixed Housing Suburban zone the July 2026 plan text sets 60 per cent of the site. Check the current rule for your own zone with council.
Can I make a patio level with my sliding door?
Yes, but only as a designed detail. BRANZ describes the E2/AS1 approach: a drained channel across the door opening, no longer than 3,700 mm, at least 200 mm wide and 150 mm deep, falling to a sump, with the patio sloping away at a minimum of 1:40. It needs planning before the concrete is poured, not after.
How long does a deck last compared with a patio?
Our FAQ says a kwila deck in Auckland can last 25 to 40 years with proper maintenance, which means oiling once or twice a year, while composite decking needs virtually no maintenance. A well-built patio asks less of you: keep the falls and the door drain clear, and stop garden beds building up against the cladding.
Can I put a roof over my deck or patio without consent?
Schedule 1 of the Building Act exempts building work in connection with a pergola, and a porch or veranda attached to an existing building at ground or first-storey level up to 20 m², with a further category up to 30 m² where an LBP designs or supervises it. Which category a roofed structure falls into is a question for council or your LBP.
Related guides
- Laying and looking after a kwila deck in Auckland
- Costs and consent across a whole outdoor renovation
- Adding a built-in outdoor kitchen beside the deck: cost and the rules it triggers
Further Resources
- Featured projects and Client stories to see specifications on some of the projects.
- Real client stories from Auckland
Need more information?
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References
- Building Act 2004, section 17 and Schedule 1 (clauses 6, 17, 17A and 24), New Zealand Legislation
- Building Regulations 1992, Schedule 1 Building Code (clauses E1 Surface water and F4 Safety from falling), New Zealand Legislation
- BRANZ, Level threshold access (Bruce Sedcole, last updated 1 August 2021)
- Auckland Unitary Plan, Chapter J Definitions (impervious area; building coverage)
- Auckland Unitary Plan, H4 Residential – Mixed Housing Suburban Zone, Standard H4.6.8 Maximum impervious area
