House washing
The short answer: In Auckland's damp, humid climate, most homes should be soft washed about once a year. Homes that are shaded, south-facing or surrounded by bush grow mould faster and often need it every 6–9 months, while homes in dry, sunny, open spots can stretch to 18–24 months.
Auckland is one of the toughest climates in the country for keeping a house clean. Warm, wet and humid most of the year, it's the perfect environment for mould, moss, lichen and algae to take hold — which is why so many local homes go green on the shady side within a year or two. Here's how to work out the right washing schedule for your place.
Before
After
What affects how often you need to wash
There's no single number that suits every home. A few things speed up how quickly your house goes green:
- Shade and sun — south-facing walls and anything shaded by trees or fences stay damp and grow mould fastest.
- Trees and bush — properties surrounded by bush get more spores, leaf litter and moisture.
- Cladding type — textured surfaces like plaster and rough-sawn timber hold growth more than smooth painted weatherboard.
- Proximity to the coast — salt air and damp add to the build-up.
A simple schedule
- Every 6–9 months — shaded, south-facing or bush-surrounded homes, or anywhere you can already see green returning.
- Once a year — the right interval for most Auckland homes, keeping cladding fresh and algae under control.
- Every 18–24 months — dry, sunny, open sites that stay clean longer.
Signs your house is overdue
Rather than watching the calendar, watch the house. It's time for a wash when you notice:
- Green or black film creeping across cladding, especially on the shady side
- Moss or lichen spotting the roof
- Grimy, dull-looking soffits, fascia and gutters
- Slippery, discoloured paths and steps
Why regular washing actually saves money
It's tempting to leave it, but mould and moss don't just look bad — they hold moisture against the surface. Over time that degrades paint, cladding and roofing, bringing forward the day you need to repaint or re-roof. A regular soft wash is a fraction of that cost, and it protects the biggest asset you own. It also keeps spore levels down around the house, which is better for anyone sensitive to mould.
Frequently asked questions
How often should you wash your house in Auckland?
Most Auckland homes should be soft washed about once a year. Homes that are shaded, south-facing, or surrounded by bush grow mould faster and may need washing every 6 to 9 months. Homes in dry, sunny, open spots can often stretch to 18 to 24 months.
Why does my house go green so quickly?
Auckland's warm, humid, damp climate is ideal for mould, moss and algae. Surfaces that stay shaded and don't dry out — especially south-facing walls and anything under trees — grow that green and black film fastest.
Is it bad to leave mould on your house?
Yes. Left to build up, mould, moss and lichen hold moisture against the surface and can stain or degrade paint, cladding and roofing over time. Washing regularly protects the surface, so it's cheaper than repainting or replacing it.
What is the best time of year to wash a house in Auckland?
House washing can be done year-round in Auckland. Many people book a wash heading into spring or summer, or before Christmas and before a house goes on the market, but a wash any time of year keeps mould under control.
Is your place looking a bit green?
We'll take a look and give you an honest recommendation on timing — no pressure. Free quotes across the Rodney District, West Auckland and the North Shore.
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