Yes — installing a basic soaker hose system in your garden beds is well within reach for most NZ homeowners. It requires no specialist licences, no building consent, and only a handful of affordable tools and fittings. Done well, it's one of the most water-efficient ways to keep your plants healthy, delivering moisture slowly and directly to the root zone.
What Is a Soaker Hose System?
A soaker hose is a porous rubber or recycled-material hose that weeps water slowly along its entire length. Unlike sprinklers, it delivers water at ground level, reducing evaporation and keeping foliage dry — which helps prevent fungal disease. A basic system typically connects to an outdoor tap via a standard garden hose, runs through your garden beds, and can be controlled manually or with a simple battery-operated timer.
What You'll Need
- Soaker hose (sold by the metre or in kit form at Bunnings or Mitre 10)
- Standard garden hose to connect from the tap to the bed
- Hose connectors, end caps, and T-pieces (usually included in kits)
- Hose staples or pegs to hold the hose in place
- A backflow preventer (highly recommended — more on this below)
- Optional: battery-operated tap timer for automated watering
- Optional: pressure reducer, as soaker hoses work best at low pressure (around 70–100 kPa)
Planning Your Layout
Before you buy anything, sketch out your garden beds and measure the total length of hose you'll need. Keep these points in mind:
- Maximum run length: Most soaker hoses perform best up to around 15–20 metres per run. Longer than this and the far end may receive very little water. Check the manufacturer's specifications.
- Spacing: Lay hose runs roughly 30–45 cm apart for most garden plants, or closer together for dense plantings.
- Slope: Soaker hoses work on gentle slopes, but very steep gradients can cause uneven distribution.
- Tap pressure: NZ mains water pressure is typically 300–500 kPa — too high for most soaker hoses. A simple pressure reducer fitted at the tap connection will protect the hose and give even output.
Step-by-Step Installation
1. Fit a Backflow Preventer
Attach a backflow preventer directly to your outdoor tap before anything else. This is a small, inexpensive device that stops garden water (and any soil or fertiliser residue) from being siphoned back into your drinking water supply. While not always legally mandated for a simple garden hose connection, it is strongly recommended as good practice and aligns with the intent of the NZ Building Code (clause G12 covering water supplies). If you're unsure about your property's setup, check with your local council or a licensed plumber.
2. Connect the Supply Hose
Run a standard garden hose from the tap to the edge of your garden bed. Attach a pressure reducer and, if you want automated watering, a battery-operated tap timer between the tap and the supply hose.
3. Lay the Soaker Hose
Unroll the soaker hose and lay it through the bed in your planned pattern — either in straight runs or gentle curves around plants. Avoid sharp bends, which can restrict flow. Secure the hose every 60–90 cm with hose staples or pegs pushed into the soil.
4. Cap the End
Fit the end cap supplied with your kit firmly onto the far end of the soaker hose. This forces water to seep through the hose walls rather than gush out the end.
5. Test the System
Turn the tap on slowly and check for even weeping along the hose length, and that all connections are leak-free. Let it run for 20–30 minutes and then check soil moisture at various points along the run.
6. Mulch Over the Hose
Cover the soaker hose with 50–75 mm of mulch (bark, pea straw, or similar). This dramatically reduces evaporation, keeps the hose protected from UV degradation, and improves water efficiency — a key consideration given water restrictions that apply in many NZ regions during summer.
Water Efficiency Tips for NZ Conditions
NZ's climate varies enormously — from the wet West Coast to the dry Canterbury plains and Hawke's Bay summers. Energywise and your local council may have water conservation guidelines worth checking. General tips:
- Water in the early morning to minimise evaporation
- Use a timer to avoid overwatering
- Check soil moisture before each watering cycle — soaker hoses can overwater in heavier clay soils if left on too long
- Adjust run times seasonally
Do You Need a Building Consent?
For a basic soaker hose system connected to an existing outdoor tap, no building consent is required. This type of work falls well outside the scope of restricted or consented building work. However, if you're considering a more complex permanent irrigation system involving trenching, new pipework, or connections to the mains supply, check with your local council and refer to MBIE Building Performance for guidance.
When to Call a Professional
A basic soaker hose system is genuine DIY territory. However, call a licensed plumber (registered with the Plumbers Gasfitters & Drainlayers Board) if you want to:
- Connect a permanent irrigation system directly into your home's water supply pipework — this is restricted plumbing work and must be done by a licensed tradesperson
- Install an in-ground automated irrigation system with solenoid valves and a controller
- Add a new outdoor tap to your property
For larger garden design and irrigation planning, a qualified landscaper can design an efficient system tailored to your soil type, plant selection, and local climate. You can find experienced local landscapers on tradedirectory.co.nz.
Sources & Further Reading
- MBIE Building Performance – Building Code clause G12 (Water Supplies)
- Plumbers Gasfitters & Drainlayers Board – Licensed tradespeople
- Energywise – Water and energy efficiency
- Bunnings – Irrigation and soaker hose products
- Mitre 10 – Garden irrigation supplies
- BRANZ – Building and home performance guidance
Licensed Building Practitioner (LBP)
