Yes, pouring a concrete garden path is well within reach for a capable DIY homeowner in New Zealand — no building consent is typically required for a simple garden path, and no licensed trade is involved. That said, concrete work is less forgiving than it looks, and a few key steps done right will mean the difference between a path that lasts decades and one that cracks within a season.
Do You Need a Building Consent?
For a standard garden path, building consent is generally not required under Schedule 1 of the Building Act 2004. However, rules can vary depending on your local council, the path's proximity to boundaries or structures, and whether it affects stormwater drainage. Always confirm with your local council before you start — what's exempt in one district may not be in another. You can find general guidance at MBIE Building Performance.
Planning Your Path
Before you mix a single bag of concrete, spend time on planning:
- Width and layout: A comfortable garden path is typically 900 mm–1200 mm wide. Mark it out with string lines and pegs.
- Drainage: Concrete paths must shed water — aim for a cross-fall of at least 1:100 (1 cm drop per metre of width) away from your house or garden beds. Poor drainage can undermine foundations and cause slip hazards.
- Thickness: For a pedestrian garden path, 75–100 mm of concrete over a compacted sub-base is standard. If you expect wheelbarrow or light vehicle traffic, go 100 mm minimum.
- Sub-base: Excavate at least 150 mm below your finished surface level. Lay 75 mm of compacted AP20 (all-passing 20 mm) crushed gravel as a base. This is critical — skipping it is the number-one cause of cracking and sinking.
Formwork
Formwork (the timber frame that holds wet concrete in shape) is usually made from 100 × 25 mm treated timber. Stake it firmly every 600–900 mm with timber pegs. Check it's level (or at your desired fall) with a spirit level before pouring. Lightly oil the inside faces so the timber releases cleanly once the concrete sets.
Choosing the Right Concrete Mix
For a garden path, you have two main options:
| Option | Best for | Approx. cost guide |
|---|---|---|
| Bagged premix (e.g. 20 kg bags) | Small paths under ~5 m² | Higher per-m³, but convenient |
| Ready-mix truck delivery | Paths over ~5–8 m² | More economical, faster pour |
A 20 MPa mix is the minimum for pedestrian paths; 25 MPa gives better durability, especially in areas with frost (common in Central Otago, Waikato hill country, and the South Island). Ask your supplier — Bunnings and Mitre 10 both stock bagged premix concrete suitable for paths.
If mixing by hand, follow the bag instructions exactly. Do not add extra water to make it easier to work — this weakens the finished concrete significantly.
Pouring and Finishing
- Dampen the sub-base lightly before pouring to prevent the dry gravel from sucking moisture out of the mix too quickly.
- Pour concrete into the formwork and spread with a shovel, working it into corners.
- Screed the surface level using a straight piece of timber dragged across the top of the formwork in a sawing motion.
- Once the surface water sheen disappears, finish with a wooden float for a slightly textured, slip-resistant surface. Avoid over-trowelling — a very smooth finish becomes dangerously slippery when wet.
- Control joints: For paths longer than about 3 metres, cut or tool control joints every 1.5–2 m to give the concrete a place to crack in a controlled, straight line rather than randomly.
Curing — Don't Rush This Step
Curing is how concrete gains its strength, and it's the step most DIYers skip. Keep the surface moist for at least 3–7 days by covering it with wet hessian or plastic sheeting, or by applying a curing compound. Avoid pouring in direct hot sun, strong wind, or when frost is forecast — all of these cause premature drying and surface cracking. BRANZ has solid technical guidance on concrete best practice if you want to go deeper.
Safety Notes
- Wet concrete is caustic — wear waterproof gloves, eye protection, and rubber boots. Prolonged skin contact can cause serious chemical burns.
- Bags of premix are heavy (20–25 kg each). Use safe lifting technique and consider a mixer hire for larger jobs.
- Check WorkSafe NZ guidance if you're hiring any equipment or working near utilities.
When to Call a Professional
While a garden path is DIY-friendly, consider hiring a qualified landscaper or concretor if:
- Your path is large (over 10–15 m²) or involves complex curves and levels
- The ground is unstable, on a slope, or has poor drainage requiring engineered solutions
- You want exposed aggregate, stamped, or coloured concrete finishes
- The path connects to a driveway, retaining wall, or structure where consent may be needed
- You simply want the job done right the first time without the risk
A professional landscaper will have the tools, experience, and contacts with ready-mix suppliers to get the job done efficiently. You can find qualified local landscapers on tradedirectory.co.nz.
Licensed Building Practitioner (LBP)
