Hiring the right deck builder starts well before anyone picks up a nail gun. By checking a builder's previous work, credentials, and reputation, you can feel confident your new deck will be safe, compliant with the NZ Building Code, and built to last — whether it's a simple ground-level platform or a multi-level entertainer's deck.
Ask to See a Portfolio of Completed Decks
Any reputable deck builder should be able to show you photos of past projects — ideally a variety of styles, sizes, and materials. Look for:
- Consistent finish quality — clean lines, even gaps between boards, tidy balustrade joins
- Range of materials — treated pine, hardwood, composite decking, or a mix
- Projects similar to yours — if you want a raised deck with a balustrade, ask to see examples of exactly that
Photos are a good start, but they only tell part of the story. Always try to visit a completed deck in person if the builder and homeowner are willing.
Visit a Completed Project in Person
A site visit is one of the most valuable things you can do. When you're there, check:
- Structural connections — are the posts, bearers, and joists neatly bolted and flashed where they meet the house?
- Balustrade height and rigidity — under NZ Building Code the NZ Building Code, balustrades on decks more than 1 metre above ground must be at least 1 metre high and structurally sound. Give the balustrade a firm push; it shouldn't flex significantly.
- Decking board gaps — typically 5–8 mm for drainage and expansion
- Overall weathertightness — look at how the deck meets the house wall; poor flashing here is a common source of moisture damage
Check References From Past Clients
Ask the builder for at least two or three references from previous clients, and actually call them. Good questions to ask include:
- Did the builder stick to the quoted price and timeline?
- Were there any issues during or after the build, and how were they handled?
- Would you hire them again?
- Did the deck require a building consent, and did the builder manage that process?
A builder who hesitates to provide references is a red flag.
Verify Their LBP Licence
In New Zealand, restricted building work (RBW) on decks — including any deck that requires a building consent — must be carried out or supervised by a Licensed Building Practitioner (LBP). You can search the public LBP register on their website to confirm a builder's licence is current and check their licence class and any past disciplinary history.
Generally speaking, decks above a certain height above ground, or those attached to the house in a way that affects weathertightness, will require a building consent. Always confirm with your local council whether your specific project needs one — rules can vary. MBIE Building Performance has useful guidance on when consents are required and what Schedule 1 exemptions may apply.
Look Into Their Business History
- Check the Companies Office (companies.govt.nz) to see how long the business has been registered and whether it is in good standing
- Search for online reviews on Google, Facebook, or Neighbourly
- Ask whether they carry public liability insurance — a professional builder should have this as a minimum
- Check if they are a member of a trade body such as Registered Master Builders or Certified Builders, which have their own vetting processes
Review Their Quote and Contract Carefully
A detailed written quote is itself evidence of professionalism. It should specify:
| Item | What to look for |
|---|---|
| Materials | Species, grade, treatment level (e.g. H3.2 or H4 for ground contact) |
| Fixings | Stainless steel or hot-dip galvanised for NZ conditions |
| Consent | Who is responsible for obtaining it |
| Timeline | Start and completion dates |
| Payment terms | Staged payments tied to milestones, not large upfront sums |
| Warranty | Workmanship guarantee period |
For guidance on fair contracts and your rights, Consumer NZ is a helpful resource.
Understand NZ-Specific Compliance Requirements
Decks in New Zealand must comply with the NZ Building Code, and structural timber decks are typically designed to NZS 3604 (Timber-framed buildings). Treated timber must meet the correct hazard class for its exposure — H3.2 for above-ground outdoor use, H4 or H5 where timber is in ground contact. A knowledgeable builder will discuss these standards with you without prompting.
For technical guidance on construction best practice, BRANZ publishes research and good practice guides that both builders and homeowners can reference.
When to Call a Professional
Always hire a qualified, LBP-licensed deck builder for any deck that:
- Requires a building consent (check with your council)
- Is elevated more than 1 metre above ground
- Is attached to the house structure
- Involves any electrical work (outdoor lighting, power points) — this is restricted electrical work requiring a registered electrician under the Electrical Workers Registration Board (EWRB)
Even for smaller, exempt decks, a professional builder brings expertise in structural design, material selection, and weathertightness that protects your home long-term. You can find qualified local deck builders on tradedirectory.co.nz.
Licensed Building Practitioner (LBP)
