Metal roofs are a different job to tile roofs. The paint systems are different, the prep is different, the failure points are different, and the cost is different. If you’ve got an ageing Colorbond, zincalume or galvanised iron roof over your Hills District home and you’re trying to work out whether it needs painting — or whether the quote you’ve received is reasonable — here’s what’s actually going on.

Quick Answer On Cost

Metal roof painting is quoted per square metre. As a rough guide for a Hills District home with a sound Colorbond or metal roof in reasonable condition, the rate starts around $60 per square metre, with older zincalume, galvanised iron, or jobs with significant rust treatment sitting higher.

Two-storey homes add a premium of roughly 15–30% over the equivalent single-storey rate, because of the extra scaffolding, height safety and time involved.

That’s a guide — every metal roof is different. For an exact number, call Nasser at Easy Cut Painting on 0416 283 735 and we’ll come out for a look.

Metal Roof Painting Is 80% Prep

A metal roof paint job only lasts if the surface is properly prepared. Here’s what proper prep looks like on a Hills District job:

Full High-Pressure Clean

Every metal roof we paint gets a proper pressure wash first — not a quick hose-down, but a high-pressure clean that removes oxidation, dirt, cobwebs and old chalking. On older zincalume and galvanised roofs, the oxidation needs to come off or the paint won’t stick.

Rust Treatment

Any spots of rust get cleaned back to sound metal, treated with a rust converter, and primed before the topcoat goes on. Skipping this step is the single most common reason metal roofs need repainting three years later instead of fifteen.

Fastener Check

We walk the roof looking for loose tek screws, failed washers, lifted sheets and popped nails. Anything letting water in gets sorted before we paint. A fresh coat of paint doesn’t fix a leaking roof.

Flashings And Penetrations

Old silicone around flashings, chimneys, whirlybirds and antennas gets checked and re-sealed where needed.

Priming

A proper metal-specific primer — etch primer for bare metal, zinc phosphate primer over rust-treated areas, bonding primer over sound painted surfaces. Different surfaces, different primers. This is where cheap jobs cut corners.

Paint Systems Matter On Metal

A metal roof bakes in Sydney’s sun. Hills District summers put surface temperatures on a dark roof well over 60 degrees. A cheap wall paint will not survive that — it cracks, flakes and chalks within a couple of years.

A proper metal roof paint system uses:

• A metal-compatible primer matched to the substrate
• A high-solids acrylic or elastomeric topcoat rated for metal roofs and UV exposure
• Two topcoats for colour, build and durability
• Quality Australian roof coatings with heat reflective technology built in — this bounces infrared radiation away from the roof surface instead of letting it soak into the ceiling cavity. Result: a cooler house and lower cooling bills through a Hills District summer. This is standard in quality metal roof coatings, not an optional extra.

Before you sign a quote, ask the painter exactly which paint product they’re using and how many coats. If they can’t tell you, that’s a red flag.

Additional Meterage — Eaves, Gutters, Fascia And More

When the ladders and safety gear are already set up, a lot of Hills District homeowners add other exterior painting work to the same job. These are all quoted as additional meterage — same rate structure, just more measured surface area added to your total. Common additions:

• Eaves, soffits and fascia
• Barge boards and trims
• Downpipes and gutters
• Feature beams and external timber

Adding these while we’re already set up saves a separate mobilisation later. If any of that is on your list, tell us when you book the quote.

Signs Your Metal Roof Is Due

Chalking. You touch the roof and your hand comes away powdery. The binder in the old paint has broken down — UV has cooked it.

Fade. One side of the roof (the north-facing side in Sydney) is visibly lighter than the other.

Rust spots. Small brown spots appearing, especially around fixings, edges, or where something has scratched the coating.

Flaking. Any peeling or lifting of the existing paint, even in small patches.

Caught early, a metal roof paint job is straightforward. Left too long and it turns into a rust repair job with paint on top, which is genuinely more expensive.

Colorbond Vs Older Metal Roofs

Colorbond

Usually the easiest. Modern Colorbond has a factory finish that lasts a long time. When that finish finally starts to chalk and fade — typically 15–20 years in — it can be washed and repainted with a compatible coating. We see this across Castle Hill, Baulkham Hills and Bella Vista homes built in the late 90s and early 2000s.

Zincalume

The bare, unpainted silver metal. It can be painted, but it needs a proper etch primer and light sanding first, or the paint won’t key in. Skip that step and the paint sheets straight off.

Older Galvanised Iron

The classic corrugated look on older Hills District homes. Can be painted, but the galvanising layer needs to be properly weathered or etched first. Fresh galvanising is a nightmare for paint to stick to. Old weathered galvanising is actually easier.

DIY?

Short version: we’d rather you didn’t. Metal roofs are slippery, pitched, hot, and the prep is the whole game. The cost of doing it twice always works out more than the cost of doing it once properly.

How We Quote Metal Roofs

We come out, walk the roof, measure it, and assess the condition. Then we write a fully itemised quote — per-square-metre rate, total meterage, any additional meterage for eaves/gutters/fascia, rust treatment scope, and exactly which paint system we’re using. No surprises.

We’ve been painting metal roofs across the Hills District for over 25 years. We’re Master Painters, we use metal-roof-rated paint systems from brands we trust, and we stand behind the work.

We also take on larger commercial painting projects — including commercial metal roofs.

Frequently Asked Questions

How Much Does It Cost To Paint A Metal Roof Per Square Metre?

For a sound Colorbond or metal roof in the Hills District, expect the rate to start around $60 per square metre, with older or rust-affected roofs sitting higher. The rate depends on metal type, condition, access and paint system. Multi-storey adds 15–30%. Call us for a specific figure on your roof.

How Long Does Metal Roof Paint Last?

With proper prep and a quality metal roof coating system, 10–15 years is a reasonable expectation in Sydney’s climate. Cheap paint on a metal roof — especially without proper rust treatment and priming — can fail within 2–3 years.

Can You Paint Over Rust On A Metal Roof?

You can, but only after the rust is properly treated. Any rust needs to be cleaned back to sound metal, treated with a rust converter, and primed with a corrosion-resistant primer before topcoating. Painting directly over untreated rust is the most common reason metal roof paint fails early.

What’s The Best Paint For A Metal Roof In Sydney?

Quality Australian metal roof coatings — high-solids acrylics or elastomerics rated for metal and UV exposure, with heat reflective technology built in. These are specifically formulated to handle the temperature extremes a metal roof goes through. Cheap wall paint or generic exterior paint is not suitable.

Can You Paint A Zincalume Roof?

Yes, but it needs specific prep — an etch primer and proper surface preparation. Without the right primer, paint won’t bond to zincalume and will sheet off. It’s not a DIY-friendly job.

Is It Better To Paint Or Replace A Metal Roof?

If the sheets are structurally sound (no holes, no severe corrosion eating through), painting is almost always better value. A quality repaint extends the roof’s life by 10–15 years. We’ll tell you honestly if the metal is past saving.

Get A Real Number On Your Metal Roof

Call Nasser at Easy Cut Painting on 0416 283 735 for a straight answer on what your metal roof will cost to paint.