Roof painting on the North Shore

Is painting your roof worth it?

Painting is worth it when the roofing itself is sound and only the coating has worn out. A chalky, faded or patchy roof with a few rust spots is a good candidate. Once sheets are rusted through, fixings have failed, tiles are cracking or the roof leaks, paint will not fix it, and you need a licensed roofer for repairs or replacement before any repaint.

Paint on a roof does two jobs. It protects the steel or concrete underneath from the weather, and it restores the look of the house from the street. One NZ paint maker’s technical team describes the average roof repaint cycle as being driven mainly by appearance: the trigger is usually chalking, the powdery surface you see when the binder breaks down in the sun.

Signs a roof is past painting and needs a roofer instead:

• Holes or rust that has eaten right through the sheet, often at laps, gutters and around fixings.
• Loose, missing or rusted-out nails and screws.
• Cracked, broken or crumbling tiles, or ridge mortar that has let go.
• Water marks on ceilings, which point to a leak.

We don’t do roof repairs, leak repairs or re-roofing. Those need a licensed roofer, and we’re happy to point you to one. When the roof checks out, the local crew can paint it once the repairs are done.

Which roofs can be painted?

Corrugated and longrun iron, pre-painted steel, pressed metal tiles and unglazed concrete or clay tiles can all be repainted with a roof paint system made for them. Each needs its own primer: galvanised steel, pre-painted steel and bare concrete all take different ones. Glazed tiles are a poor base for paint, and any roof from before the 2000s gets an asbestos check first.

Iron and pre-painted steel

Most North Shore metal roofs are either galvanised corrugated iron or factory pre-painted steel. A manufacturer’s data sheet for a waterborne acrylic roof paint says galvanised and zinc-aluminium coated steel must be primed before the topcoat, and pre-painted steel takes its own pre-coated steel primer. Near the coast, the same sheet notes more than one primer coat may be needed because salt makes conditions more corrosive.

Concrete and clay tiles

Weathered concrete tiles soak up water and lose their surface, so they are washed, treated for moss and lichen, then sealed before two finish coats. Unglazed terracotta can be painted the same way. Glazed tiles are different: one manufacturer’s technical advice warns that paint struggles to hold on glazed areas and flaking is likely, so we usually recommend leaving them as they are.

Decramastic and other pressed metal tiles

Chip-coated pressed metal tiles can be repainted, but two cautions apply. A repaint restores the colour, not the original stone-chip texture. And the bitumen layer on these tiles can bleed into solvent-based paint, so a waterborne primer is used on bare spots. Some older mastic and bitumen-based tile coatings may contain asbestos, which leads to the next point.

Asbestos check first. WorkSafe warns that asbestos may be present in buildings built before the 2000s and that decramastic tiles installed before asbestos was phased out may contain it. High-pressure water blasting is prohibited on asbestos-containing roofing under the Asbestos Regulations. On any pre-2000s roof and every decramastic roof, the crew never water blasts: cleaning is a low-pressure soft wash, and if asbestos is suspected we’ll ask you to have it tested before anything else happens.

What happens before a roof is painted?

Before any paint goes on, the roof is cleaned, moss and lichen are treated, loose and flaking paint is taken back to a firm edge, rust is removed as far as practical, and bare areas are spot primed. Only then do the two finish coats go on. Manufacturers’ roof repaint specifications put this preparation at the centre of how long the job lasts.

Here is how a typical repaint builds up, following a manufacturer’s published system for a waterborne acrylic roof paint:

1. Moss and lichen treatment. Heavy growth is treated first so it dies back before washing. Treatments go on in dry weather, never when rain is forecast.
2. Wash. A roof wash removes dirt, chalk and loose material. On older roofs this is a soft wash, never a blaster.
3. Rust and flaking paint. White corrosion and as much red rust as practical are removed mechanically, and flaking paint is feathered back to a sound edge.
4. Primer. Bare metal and rusted spots are primed with a metal primer; bare concrete tiles get a sealer.
5. Two finish coats. The data sheet calls for two coats by brush, roller or airless spray, with a minimum two-hour recoat time that depends on film thickness and the weather.

Wash water and treatment run-off must not reach the stormwater drains. Auckland Council’s guidance on pressure washing and water blasting says downpipes should be disconnected or diverted to unsealed ground and drains blocked, and that moss and mould removers should not go on when rain is forecast. Containment is part of the quote, and we’ll tell you how the crew plans to handle it at your place.

Older roofs may also carry lead-based paint under newer coats. The same data sheet recommends lead testing on roofs installed before 1971, and Health New Zealand advises treating buildings from the 1980s or earlier as likely to have lead-based paint. Where lead is likely, flaking paint should come off by methods that keep dust and flakes contained and collected.

Choosing a roof colour

Pick a colour that suits the house and the street, then think about heat and upkeep. Lighter roofs reflect more of the sun’s heat, but one manufacturer notes they stay cooler and damper, so moss and mould can take hold sooner. Many roof paints offer heat-reflective versions of darker colours. If your house has heritage controls, check before changing the colour.

A few practical points:

• Heat. Paint makers sell darker roof colours with pigments that reflect more infrared light, so they absorb less heat than the same colour without them. For the strongest effect, one maker tests these colours over a white base coat. We can’t promise a set drop in indoor temperature, because insulation and ventilation matter as much as the paint.
• Weathering. North and west-facing slopes get the most sun and usually show wear first, whatever the colour.
• Gutters and trims. Matching or contrasting the fascia and gutters changes the look a lot. Those are painted surfaces on the house, though, and this page covers the roof only.
• Samples. Roof colours look lighter on a big sunny slope than on a small card. Look at a painted sample outside before deciding.

Some Auckland properties are scheduled for heritage or sit in a special character area, where changes to the outside of a house can be managed under the Auckland Unitary Plan. Auckland Council explains how to check if there are heritage controls on your property. If your street has them, confirm with the council before a colour change.

Does a roof repaint need a building consent?

Repainting an existing roof is maintenance, and maintenance normally needs no building consent. MBIE’s Building Performance site says owners can maintain their buildings without a building consent, under Schedule 1 of the Building Act 2004, provided comparable materials are used. The work must still comply with the Building Code.

Schedule 1 covers the repair and maintenance of building components where comparable materials are used. It does not cover everything. Repairing or replacing roofing that has failed the Building Code’s durability requirements, other than maintenance, falls outside the exemption, and so does swapping to a heavier roof that changes the load on the structure.

That is another reason roof repairs and re-roofing sit with a licensed roofer rather than with us. If you are unsure whether your project counts as maintenance, Building Performance suggests asking the council for a discretionary exemption or applying for a consent rather than guessing.

When is the best time of year to paint a roof?

The best time is a settled dry spell with mild temperatures, which is easiest to find in the warmer months. Waterborne roof paint should not go on below 8 °C, or when it may drop below that while drying, and the roof needs to be dry. Very hot roofs and late-afternoon starts cause their own problems, so timing within the day matters too.

What the paint label and manufacturers’ advice say about weather, for a typical waterborne acrylic roof system:

• Minimum temperature. Not below 8 °C, or when it may fall below 8 °C during drying. A winter additive lets the brush-and-roller grade go down to 3 °C.
• Too hot. One maker advises around 18 °C in the morning as ideal, because paint on a very hot roof can dry before it forms a proper film.
• Dew. Paint applied late in the day, or on shaded south-facing slopes in cooler months, may not form a film before the evening dew, and can blister.
• Rain. Moss and mould treatments, washing and painting all need dry weather. Auckland Council guidance says treatments should not go on when rain is forecast.

It helps to ask for a quote early, so the job can wait for a good weather window rather than being squeezed into a poor one. If the roof is collecting drinking water into a tank, the data sheet says downpipes stay disconnected until the first shower of rain after painting has flushed the surface.

What roof painting costs in Auckland

Roof painting is priced on area and condition. Published Auckland rates for metal roofs run about $17 to $25 per square metre for the painting itself, while whole-job quotes for a roughly 100 m² roof land between $2,000 and $4,000 once washing, prep and access are included. Rust treatment and scaffolding can add $500 to $2,000 each. We price yours after an inspection.

A guide only, built from figures Auckland roof painters and renovation companies publish (checked October 2026). Rates published excluding GST have had GST added; guides that do not state GST are shown as published. We confirm your price after seeing the roof.

How a roof repaint runs

1. Inspection: the crew checks the roof material, its age, rust, moss and any asbestos or lead risk, and we quote.
2. Wash and treat: moss and lichen are treated in dry weather, then the roof is washed, by soft wash on any pre-2000s or decramastic roof, with run-off kept out of the stormwater.
3. Repairs flagged: anything that needs fixing, like rusted-through sheets, failed fixings or broken tiles, goes to a licensed roofer before painting.
4. Prep and prime: flaking paint and rust are taken back, bare metal is primed and bare tiles are sealed.
5. Two coats: two finish coats go on in suitable weather, with drying time between them.
6. Final check: the crew looks over the finished roof, gutters and downpipes, and downpipes are reconnected when it is safe to do so.