The ground decides the structure before you decide the finish.
Ask most people whether they want a deck or a patio and they'll answer with a material preference — timber warmth versus paved durability. That's a real consideration, but it's the second question, not the first. The first question is how far the ground drops away from the house at the point where the new surface needs to sit. A deck is a raised structure on a substructure of bearers, joists and footings, so it can span over an awkward level change without earthworks. A patio is a paved surface built up from prepared, compacted ground, so it needs that ground to already be close to the finished level — or needs fill and retaining to get it there first.
That structural difference tends to answer the deck-versus-patio question before appearance, budget or maintenance preference get a vote. Once the level change is known, what's left is a genuine comparison between the two on the things that do come down to preference: how each surface feels underfoot, what upkeep it needs over a decade, and how it handles water once it's built. This page works through both — the structural question first, then the practical comparison, then what actually drives cost once the format is settled.
What's underneath a deck.
01 · Deck vs. patio
Two different structural answers to the same brief.
Timber deck
Best fitSloping sites, level changes from the house
CharacterWarm, elevated, ventilated substructure
ConsiderSubstructure engineering, ongoing maintenance
Maintenance cyclePeriodic oiling or staining, typically every 1–3 years
Paved patio
Best fitGround-level or near-ground sites
CharacterDurable, low-maintenance surface
ConsiderBase preparation, falls for drainage
Maintenance cycleOccasional resealing or joint maintenance; otherwise largely maintenance-free
Composite deck
Best fitWhere low maintenance matters more than material cost
CharacterConsistent, weather-resistant surface
ConsiderHigher material cost, substructure still required
Maintenance cycleOccasional cleaning; no oiling or staining required
02 · What shapes the decision
Four factors beyond material preference.
Level change
A deck can resolve a level change a patio cannot; a patio on a sloping site needs retaining or significant fill first, which can add cost that quickly outweighs any saving on the paving itself.
Access & flow
Indoor-outdoor flow from living areas usually sets the finished level and threshold detailing, and getting this datum wrong affects everything built off it afterward, including door thresholds and weathertightness.
Exposure
Sun, rain shelter and wind exposure affect both material choice and whether a roof or pergola is part of the brief, since an unshaded surface in a hot exposed spot can become genuinely uncomfortable to use in summer.
Maintenance
Timber decks need periodic treatment; composite and paved surfaces trade material cost for lower upkeep, and the right answer depends on how much ongoing maintenance the household is realistically willing to keep up with.
03 · Cost drivers
Substructure, not surface finish, is usually the bigger number.
04 · Worked scenarios
Two outdoor-surface briefs.
Rear deck off a raised living area
A 900mm level change from the house means a timber deck with engineered substructure and a balustrade is the practical answer over patio and fill, since closing that gap with fill and retaining would cost more than the deck itself.
Ground-level courtyard off a slab home
Minimal level change favours a paved patio with correctly detailed falls to drain water away from the building, and the decision here comes down to underfoot comfort and long-term maintenance preference rather than structural necessity.
05 · Before comparing quotes
Confirm scope is genuinely comparable.
- Confirm height above ground and whether balustrades are required and included.
- Ask what substructure or base preparation is specified, not just the visible surface.
- Check maintenance expectations for the material over a 10-year horizon.
- Confirm how the new surface sheds water away from the house.
Decks & patios: common questions
Can a patio be built where there's some level change from the house?
For modest drops, yes, with fill or a low retaining edge — but once the level change becomes significant, the cost of retaining and filling to bring the ground up usually outweighs simply building a deck instead.
Do decks always need a building consent?
It depends on height above ground and other factors set by the building code, so it varies case by case — confirm with your council or a licensed building practitioner rather than assuming either way.
How long does a timber deck typically last before major work is needed?
With regular maintenance, a well-built timber deck's structure can last decades, though the visible decking boards themselves may need attention or replacement sooner depending on exposure and timber grade.
Is composite decking worth the extra material cost?
If reducing ongoing maintenance is a priority, often yes — composite avoids the periodic oiling or staining timber needs, though it still requires the same engineered substructure underneath, so it doesn't reduce structural cost.
Decks & Patios Across New Zealand
Explore deck and patio planning, cost considerations and local site factors for major New Zealand regions.
- Decks & patios in Auckland
- Decks & patios in Hamilton
- Decks & patios in Tauranga
- Decks & patios in Rotorua
- Decks & patios in Whangārei
- Decks & patios in Wellington
- Decks & patios in Lower Hutt
- Decks & patios in Palmerston North
- Decks & patios in Napier–Hastings
- Decks & patios in New Plymouth
- Decks & patios in Nelson
- Decks & patios in Christchurch
- Decks & patios in Dunedin
- Decks & patios in Queenstown
- Decks & patios in Invercargill
Sources & methodology
Designed to show its working.
Deck height, balustrade and consent requirements vary by council and site. Confirm structural and consent requirements for the specific property with a licensed building practitioner.