Ventilation System Installation in Auckland

Signs You Need Help

When You Need Ventilation

Condensation on your windows is the obvious one. You wake up, the glass is dripping, and the sills are going soft. That’s not normal wear and tear. That’s a ventilation problem.

Mould in the bathroom is another red flag. Particularly around the ceiling, the shower surround, and behind the vanity where air doesn’t move. A window cracked open won’t fix it if there’s no mechanical extraction pulling moisture out.

Then there’s the musty smell. Sometimes you stop noticing it because you live with it. Visitors notice. It means trapped moisture in the house, and it gets worse in winter when everything stays closed up.

Landlords have a deadline too. The Healthy Homes ventilation standard requires working extraction in kitchens and bathrooms for all rental properties. If your fans don’t meet the minimum airflow rates or vent into the roof space instead of outside, they don’t count. The Healthy Homes ventilation standard on Tenancy Services spells out exactly what’s required.

And if you’re just putting in a new rangehood or replacing a tired bathroom fan, that still needs an electrician. Wiring it to a switch is the easy part. Getting the ducting right and making sure it meets Building Code G4 is the bit most people miss.

Our Ventilation Services

What We Handle

Positive pressure systems are what most Aucklanders think of first. HRV, DVS, SmartVent. These pull drier air from the roof space and push it through the house, which dilutes moisture and reduces condensation. They work well in older, draughtier homes. One thing to know: positive pressure on its own doesn’t extract air to outside, so it won’t satisfy Healthy Homes requirements for kitchens and bathrooms without separate extraction fans.

We also install balanced pressure and heat recovery systems. These supply fresh air in and extract stale air out in roughly equal amounts, often recovering heat in the process. For newer, more airtight homes where moisture gets trapped because the house is sealed up tight, balanced systems make more sense than positive pressure.

Bathroom extractor fans are probably our most common ventilation job. Ceiling-mounted, inline (hidden in the roof space with just a grille visible), or through-wall units where ducting to the roof isn’t practical. The key spec: 120mm minimum duct diameter and at least 25 litres per second airflow for any fan installed after July 2019. Plenty of older homes still have undersized 100mm fans that don’t cut it.

Kitchen rangehood wiring gets its own mention because it’s not just plugging in a unit. Rangehoods need 150mm ducting run to outside, and the circuit needs to handle the motor load. We wire them, connect the ducting, and fit the exterior cowl so you’re compliant with G4.

Controllers and humidistats are the finishing touch. A humidistat turns the fan on automatically when moisture levels climb, which means the bathroom fan runs when it needs to without anyone remembering to flick a switch. We install multi-speed controllers, timer switches, and humidity-sensing units depending on what suits the setup.

Dedicated circuit wiring ties everything together. Ventilation systems, particularly whole-house units and rangehoods, draw enough current that they shouldn’t share a circuit with lights or power outlets. We run dedicated circuits back to the switchboard so everything operates safely and within regulations.

Auckland Coverage

Ventilation Across Auckland

A huge chunk of Auckland’s housing was built before 1990. Timber-framed, single-glazed, minimal insulation. These homes breathe a bit on their own through gaps and cracks, but that doesn’t mean moisture is under control. Walk through suburbs like Mt Roskill, Glenfield, Panmure, or Blockhouse Bay and you’ll find plenty of bathrooms with no extractor fan at all, or a fan that vents straight into the roof cavity. That causes rot, wet insulation, and more mould than it prevents.

The renovated villas and bungalows in Grey Lynn, Ponsonby, Mt Eden, and Devonport have their own version of the problem. New double glazing and better insulation make the house warmer but also trap moisture that used to escape through the old leaky envelope. Without planned ventilation, condensation actually gets worse after a renovation. Seems backwards, but it’s common.

Auckland’s maritime humidity makes all of this harder. Even a well-built home collects moisture from cooking, showers, breathing, and drying laundry inside. On the North Shore and Eastern Bays, salt-laden coastal air adds corrosion to the mix, so fan and ducting materials need to handle that too.

For landlords and property managers across South Auckland, the West, and everywhere in between, the pressure is practical. Healthy Homes compliance isn’t optional, and tenants are increasingly aware of what’s required. Getting ventilation sorted properly the first time saves callbacks and maintenance down the track.

Our Process

What to Expect

Why Us

Why Choose Totally Amped Electrical

Every extraction system we install vents to outside. Full stop. Not into the roof space, not into the soffit cavity. Venting into the roof is the single most common ventilation mistake in Auckland homes, and it causes more damage than having no fan at all. Wet insulation, timber rot, and mould in the ceiling framing all trace back to this shortcut.

We size fans to Building Code G4 requirements, not to whatever fits the hole. That means 25 L/s minimum for bathrooms and 50 L/s for kitchens, with adjustments for duct length and bends. An undersized fan that technically spins but doesn’t move enough air is a compliance problem waiting to happen.

For landlords and property managers, we provide written compliance documentation after every ventilation job. Fan specifications, duct diameters, measured airflow rates. If Tenancy Services or a property inspector asks for evidence, you’ve got it.

And we’re licensed electricians. Ventilation work that involves electrical connections, dedicated circuits, or switchboard modifications is prescribed electrical work in New Zealand. We do it properly, we sign it off, and it’s done right.

Does my HRV or DVS system count for Healthy Homes compliance?

On its own, usually not. Most HRV and DVS units are positive pressure systems that push air through the house but don’t extract from kitchens or bathrooms to outside. Healthy Homes requires mechanical extraction directly from wet areas. You’ll likely need dedicated extractor fans in bathrooms and a ducted rangehood in the kitchen alongside your existing system.

What size fan does my bathroom need?

If it’s being installed now, 120mm duct diameter minimum and at least 25 litres per second (L/s) airflow. Older 100mm fans often fall short of that, especially with longer duct runs where friction reduces airflow. We measure the actual output to confirm.

Can you install a ventilation system in an older home?

Absolutely. Pre-1990s homes are actually where we do most of our ventilation work around Auckland. Roof spaces in older timber homes are usually accessible enough for running ducting, and ceiling-mounted or inline fans fit without major structural changes. The main thing is getting ducts routed to an exterior wall or roof cowl rather than dumping into the roof cavity.

Why is my bathroom fan so noisy?

A few reasons. The fan might be oversized for the space, the bearings could be worn, or (most common) the duct run has sharp bends or crushed flexible sections creating turbulence. Sometimes the fan is mounted directly to ceiling joists without rubber isolators, which transmits vibration through the whole ceiling. We sort all of that.

Do I need a separate circuit for a ventilation system?

Depends on the system. A single bathroom fan on a timer can usually share an existing lighting circuit. Whole-house systems like HRV, DVS, or SmartVent draw more current and should run on a dedicated circuit. Same goes for larger rangehoods. We assess the electrical load during the inspection and run a dedicated circuit if the existing setup can’t handle it safely.