Before your deck builder swings a single hammer, there's a fair bit of groundwork — literally and figuratively — that needs to happen on your property. Giving your builder the right access from the start helps the job run smoothly, safely, and on time. Here's what to expect.
Initial Site Inspection Access
The first thing any reputable deck builder will want to do is walk your property. This site inspection lets them assess the ground conditions, existing structures, drainage, and the best position for your new deck. They'll look at:
- The slope and stability of the ground where the deck will sit
- Proximity to the house, fences, and boundaries
- Existing paving, gardens, or landscaping that may be affected
- Sun orientation and prevailing wind (important in many NZ regions)
- Overhead lines or underground services that could affect the build
Make sure gates are unlocked and dogs are secured so the builder can move freely and safely around the site.
Access to Utility and Service Locations
Before any digging for posts or footings begins, your builder needs to know where underground services run. Striking a buried power cable, gas line, or water pipe is extremely dangerous and costly. In New Zealand, you can request a free service location plan through Dial Before You Dig — your builder may arrange this, but it's worth confirming who is responsible.
Your builder will also want to know the location of:
- Electrical mains and sub-boards — especially if the deck will include outdoor lighting or power points (electrical connection is restricted work under the Electrical Workers Registration Board and must be done by a registered electrician)
- Water and drainage pipes — relevant if you're adding an outdoor tap or if drainage needs to be redirected
- Gas lines — if an outdoor BBQ connection or heater is planned, a licensed gasfitter registered with the Plumbers Gasfitters & Drainlayers Board must do that work
Access to the House Structure
If your deck will be attached to the house (a ledger-mounted deck), the builder needs access to the exterior wall framing. They'll need to inspect — and often expose — the wall cladding or framing to ensure the ledger board is fixed correctly and that weatherproofing around the connection meets the requirements of the NZ Building Code, particularly Clause E2 (External Moisture).
For elevated decks, they may also need to access the subfloor space or interior rooms to check structural connections.
Building Consent and Council Requirements
Depending on the size and height of your deck, a building consent may be required. Under Schedule 1 of the Building Act, some low-level decks (generally no more than 1.5 metres above ground) may be exempt — but this varies by council and site conditions. Always confirm with your local council before assuming consent isn't needed.
If consent is required, your builder will need:
- Access to complete accurate site measurements and drawings
- Details of the existing structure the deck attaches to
- Possibly a copy of your property's LIM report or existing building consent records
Your builder may handle the consent application, or you may need to apply yourself — clarify this upfront. You can find guidance on consent requirements at MBIE Building Performance.
Ongoing Site Access During the Build
Once work is underway, your builder will need reliable daily access, which typically includes:
- Vehicle and trailer access for delivering timber, hardware, and tools — check whether your driveway or side access can handle a ute and trailer
- A clear work zone — move outdoor furniture, pot plants, and children's play equipment out of the build area
- Access to power and water — most builders will use your outdoor power point and may need a tap for mixing concrete for footings. Discuss this beforehand and agree on fair use
- A place to store materials — decking timber, posts, and hardware need somewhere dry and flat to be staged
Neighbour and Boundary Considerations
If your deck is close to a boundary, your builder may need to work near or along the fence line. It's courteous — and sometimes necessary — to let neighbours know work is starting. In some cases, access to a neighbour's property may be needed temporarily; this requires their permission.
When to Call a Professional
A qualified deck builder will manage most of the access and planning requirements for you, but it's important to use a tradesperson who understands NZ building regulations. Look for builders familiar with NZS 3604 (Timber Framed Buildings) and the NZ Building Code. If your deck includes electrical, plumbing, or gas work, those specific elements must be completed by licensed tradespeople — no exceptions.
For peace of mind, consider using a Licensed Building Practitioner (LBP), who is legally authorised to carry out and sign off restricted building work. You can find qualified local deck builders on tradedirectory.co.nz.
For technical guidance on timber decking construction and weatherproofing best practice, BRANZ is an excellent NZ-specific resource.
Licensed Building Practitioner (LBP)
