Finding Qualified Healthy Homes Contractors in NZ: EWRB, Gasfitters, and Who Does What

Which Healthy Homes Work Needs a Registered Tradesperson

The Healthy Homes Standards let you self-assess most compliance requirements — measuring rooms, checking insulation depths, testing fan operation. Work that falls within regulated electrical, gas-fitting, or drainlaying work must be carried out by an appropriately registered professional.

Getting this wrong doesn't just risk a botched installation. The work may not satisfy the standard or other safety and building requirements.

Heat Pump Installation: EWRB-Registered Electricians

Electrical work associated with installing, relocating, or replacing a heat pump must be performed by a person registered with the Electrical Workers Registration Board (EWRB). The heat pump work may also involve a qualified HVAC technician.

After installation, the electrician must issue an Electrical Safety Certificate (ESC). This certificate confirms the work complies with NZ electrical safety standards and is a key piece of your Healthy Homes evidence file.

How to verify an electrician's registration: search the EWRB public register at ewrb.govt.nz and check the person's registration.

When hiring for a heat pump install, provide the contractor with:

• The required kW output from the MBIE Heating Assessment Tool
• The location for the indoor and outdoor units
• Confirmation that the unit must have a thermostat (unthermostatted heaters don't satisfy the standard)

Direct-wired panel heaters (1.5 kW or above with thermostat) are permitted only where the required heating capacity is 2.4 kW or less. For most NZ living rooms, a heat pump is the practical choice.

Gas Work: Registered Gasfitters

Installing, servicing, or modifying any gas appliance — flued gas heaters, gas hobs, gas hot water systems — requires a gasfitter registered with the Plumbers, Gasfitters, and Drainlayers Board (PGDB).

This applies to:

• Flued gas heater installation: a qualifying heater under the Healthy Homes heating standard, but only if properly flued and installed by a registered gasfitter
• Wood burner and pellet fire installation: requires both a registered installer and a building consent from your local council
• Removing or decommissioning unflued gas heaters: unflued LPG cabinet heaters are prohibited under the Healthy Homes Standards, so if one needs to come out and be replaced, a gasfitter handles the disconnection

The gasfitter issues a Gas Safety Certificate after installation. Keep this in your evidence file alongside the appliance specifications and invoice.

How to verify: search the PGDB public register at pgdb.co.nz. The register covers plumbers, gasfitters, and drainlayers.

Drainage: Certified Drainlayers

Work on ground drainage — such as modifying stormwater systems or connecting or redirecting downpipes below ground — requires a certified drainlayer, also registered through the PGDB.

For the moisture ingress and drainage standard, a common contractor need is work on blocked or damaged underground drainage. Gutter clearing and above-ground downpipe reattachment can be done without a registered drainlayer; work on underground pipes, soak pits, or council stormwater connections needs one.

Insulation: Professional Installers (Not Legally Mandated, But Practical)

Unlike electrical, gas, and drainage work, insulation installation does not legally require a registered tradesperson. A competent landlord can install ceiling batts or underfloor insulation themselves, provided the product meets the climate zone R-value requirements.

That said, professional installers from companies affiliated with the Insulation Association of New Zealand offer:

• Correct product selection for your climate zone
• Proper installation to NZS 4246:2016 (especially for ground moisture barriers)
• Written confirmation of R-values and coverage area — useful evidence for your compliance file

For ceiling insulation in tight spaces or underfloor work in crawl spaces, professional installers have the equipment and experience to do the job safely.

What You Can Do Yourself

These tasks don't require any registration:

• Measuring rooms for the Heating Assessment Tool (length, width, ceiling height, window areas)
• Checking insulation depth and condition in accessible ceiling and subfloor spaces
• Testing extractor fan operation and checking that ducting exits to the exterior
• Draught stopping: fitting weather-stripping, sealing gaps around doors and windows, blocking unused fireplaces
• Clearing gutters and downpipes (above-ground maintenance)
• Photographing everything for your evidence file

Briefing Your Contractor

The biggest source of wasted money in Healthy Homes compliance is a contractor who installs the wrong specification because the landlord didn't brief them properly. Before any trade visit:

1. Know the required output or specification (kW from the heating tool, fan diameter and L/s flow rate, insulation R-value for your climate zone)
2. Put the brief in writing — what needs to be installed, where, and to what specification
3. Ask for the relevant safety certificate or compliance documentation after the job
4. Photograph the completed installation with a dated image

The NZ Healthy Homes Compliance Guide includes a printable contractor briefing checklist covering the specifications for each standard, so the tradesperson knows exactly what's needed before they arrive.

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