This scene is probably familiar to you, especially in winter. The heat pump has been running since four, even with the curtains drawn. And despite this, the lounge is still cold by eight.
Across Dunedin, villas and bungalows leak warmth through bare ceilings and damp subfloors. The fix rarely starts with a heater. It starts with what gets written into your plans.
Quick Summary
Searches for “healthy homes dunedin” usually surface the Healthy Homes Standards, which are legal minimums for rental properties only. Your own home does not have to comply. But the five areas the standards cover (heating, insulation, ventilation, moisture, draught stopping) are a sensible starting point for any renovation.
Good healthy home design in NZ goes further. It includes proper insulation, heating capacity, extractor fans and a ground moisture barrier before a builder prices anything. Here is what those specifications mean for an older Dunedin home.
What Counts as a Healthy Home in Dunedin
A healthy home holds warmth, stays dry underneath, and moves moist air out before it condenses. In New Zealand, the phrase also has a legal meaning. The Healthy Homes Standards, set by the Residential Tenancies (Healthy Homes Standards) Regulations 2019, required all private rental properties to comply by 1 July 2025. The five key areas each map to a line on your plans:
- Heating: a fixed heater for the main living room
- Insulation: ceiling and underfloor first
- Ventilation: extractor fans plus openable windows
- Moisture ingress and drainage: working gutters and a dry subfloor
- Draught stopping: sealing the gaps that let cold air in
So, do the healthy homes standards apply to my own home? The quick answer is no. If you own and live in your house, the regulations do not require you to meet the minimum requirements. Though the numbers still matter.
Analysis of 2023 Census data by Environmental Health Intelligence New Zealand found that nearly 700,000 Kiwis, or 16.5 percent of New Zealanders, are living in homes affected by visible mould. In a city with as much pre-war timber housing as Dunedin, treat the rental homes minimums as your floor, not your target.
Insulation: Where a Warmer Dunedin Home Starts
Ceiling and underfloor insulation does more for warmth than any other single line on your plans. Heat rises, so an uninsulated ceiling is the biggest escape route.
Is it common for old houses to not have insulation? Much of it, yes. Many older Dunedin homes were built without the levels of insulation and energy efficiency that are required today. In fact, many of these older homes are yet to see these energy-saving features implemented.
If you’re wondering how to make an old Dunedin home warmer, you can work in this order:
- Ceiling insulation
- Underfloor insulation
- Windows and draughts
Keeping a 100-year-old house warm follows the same process. But bear in mind that adding insulation to walls will require a building consent. That makes it a consented, documented renovation, not a weekend project.
What insulation R-value do I need in Dunedin? R-value measures resistance to heat flow. Higher is warmer. Compare the rental floor with new building work in Otago’s zone:
| Rental minimum | New building work (Building Code H1) | |
|---|---|---|
| Ceiling/roof | R3.3 | R6.6 |
| Underfloor | R1.3 | Higher, set by the H1 schedule |
BRANZ guidance on insulation requirements has the full H1 schedule. That gap is why a villa renovation drawn to current code feels like a different house.
Heating, Ventilation and Healthy Humidity
Healthy home heating means having a fixed heating device in the main living room. It should reach at least 18 degrees Celsius on a cold day as per the heating standard’s benchmark. In practice, that usually means a heat pump sized from the room’s measurements.
Heating only works alongside ventilation: dry air is cheaper to heat than damp air. Kitchens and bathrooms produce most of a home’s moisture, so the plans should show extractor fans in both, vented outside, plus windows that open in every habitable room.
What is a healthy humidity level in a home? Roughly 40 to 60 percent relative humidity. Any higher and condensation and mould follow. Keep the lounge heated and the air moving, and even a July night in Dunedin stays on the right side of that range.
What is a healthy indoor temperature in winter? At least 18 degrees in living areas, warmer for young children or older occupants.
Moisture Barriers and Dry Ground
Older Dunedin homes are more prone to dampness from the ground underneath. Thankfully, the Healthy Homes moisture barrier requirement provides guidelines for addressing this particular issue. For example, the guidelines recommend installing a layer of heavy polythene sheet over the soil in an enclosed subfloor. This prevents moisture from reaching the timber floors and through the living room.
Drainage does the same job outside. Gutters and downpipes need to carry stormwater well clear of the house, which takes real thought on Dunedin’s sloping sections. These details belong on the drawings: subfloor ventilation, drainage paths and the barrier itself.
Start With the Plans, Not the Building Site
R-values, heating capacity, fan sizes, the ground barrier: every one of these is a line on your drawings. Decided during the Concept Design stage, they cost nothing extra. Left until the builder has priced, they come back as paid variations.
Epoch’s renovation design service resolves them inside the architectural process, and your first chat with the team is free.
A warm, dry, healthy home isn’t a luxury in Dunedin. It’s the whole point. But it starts on the plans, not on the building site.
Eco Workshop has been designing healthy homes for over twenty years and knows exactly what needs to be specified in the drawings to make the difference between a house that’s warm and one that’s not. Come in for a free chat at 31e Stafford Street.
References
Environmental Health Intelligence New Zealand. (2025). Living in mouldy dwellings: Surveillance report 2023.
https://www.ehinz.ac.nz/assets/Surveillance-reports/Released_2025/Mouldy-dwellings-surveillance-report-2023.pdf
Ministry of Business, Innovation and Employment, Tenancy Services. (2026). Healthy homes.
https://www.tenancy.govt.nz/healthy-homes/
BRANZ. (2026). Determining insulation requirements.
https://www.level.org.nz/passive-design/insulation/determining-insulation-requirements/