The roof has been patched three times in five winters. The latest roofer looked up from the ladder and said the words nobody wants to hear: it’s time for a new one. So the first question is obvious. What does a Colorbond roof replacement cost, and why do quotes for the same house come back so far apart?
We get asked this on just about every job we quote on the Mornington Peninsula. The honest answer is that we can’t give you a price without measuring, and neither can anyone else, at least not one you should trust. What we can do is show you exactly what goes into the number. Once you know that, you can read a quote properly and spot when something is missing.
Square metres set the base price, but they rarely decide it
Every quote starts with the area of the roof. That’s the sheeting, the screws and the labour to lay it. Two houses with the same floor area can still have very different roofs, though, and the shape is where the money goes.
A simple gable roof (two flat planes meeting at a ridge) is the cheapest kind to sheet. Long, straight runs go down quickly with very little cutting. A hip roof with valleys, a few dormers and a skillion over the extension is a different job entirely. Every hip and valley means cut sheets, extra flashings and slower progress. Flashings are the folded metal strips that seal the joins, edges and anything poking through the roof.
Pitch matters too. A steep roof takes longer to work on safely, and that time shows up in the labour line.
What comes off the roof affects the price as much as what goes on
This one surprises people. A fair share of a replacement quote has nothing to do with the new roof at all. It’s the cost of stripping and disposing of the old one.
- Old metal sheeting is the easiest to remove. It’s light and lifts off in big pieces.
- Concrete or terracotta tiles are heavy, slow to strip and cost more to cart away.
- Decramastic (pressed metal tiles with a stone chip coating) is fiddly to remove, and the loose granules make a mess.
- Asbestos cement sheeting, found on some older homes and sheds, has to be removed by a licensed asbestos removalist. That is a separate, specialist cost and it’s not optional.
If you’re swapping tiles for steel, the battens (the timber or steel rails the roof sits on) usually need work as well. Tiles and metal sheets need battens at different spacings, so expect a line for refixing or adding battens. A metal roof is also much lighter than tiles, so it relies on being properly fixed down against the wind rather than on its own weight. That’s worth asking about on any tile conversion. We cover the bigger decision in our guide to choosing between Colorbond and tiles.
Near the water, the steel itself costs more
Standard Colorbond suits most of the peninsula. But BlueScope, which makes it, recommends a heavier duty product called Colorbond Ultra for homes in severe coastal conditions, where salt spray hits the roof regularly. For the harshest sites right on the coast there is also a stainless steel version.
Both cost more than standard sheet. On a bayside street in Rosebud or Rye, or a clifftop in Mount Martha, it is usually money well spent. Warranty cover depends on the product and on how far the house sits from the coast, so a cheaper quote using standard steel on a beachfront home is not really comparing like with like. Ask every roofer which grade they have priced, and ask for the manufacturer warranty for your address in writing.
Profile changes the price a little too. Corrugated (Custom Orb is the classic wavy profile) and the flatter, boxier trapezoidal profiles are priced differently, and concealed fix profiles such as Klip-Lok cost more again. Concealed fix sheets have no screws through the top, which makes them a good match for low pitches.
The extras that turn a cheap quote into an expensive one
Most of the arguments we hear about roof quotes come down to what was, or wasn’t, included. These are the items worth looking for line by line.
Safety gear and scaffolding
Victorian workplace safety rules require edge protection or scaffolding for roof work where there’s a fall risk. On a two storey home, a steep block or a tight side passage, this can be a real slice of the total. A quote that leaves it out hasn’t saved you anything. It has either missed it or plans to add it later.
Insulation blanket or sarking
Under a metal roof we strongly recommend a foil backed insulation blanket. It cuts heat, controls condensation and takes the edge off rain noise. On a tile conversion, it’s what stops a new steel roof sounding like a drum in a downpour. Our explainer on roof sarking covers the difference between the two.
Gutters, fascia and downpipes
If your gutters are old, replace them at the same time. The scaffolding is already up and the new roof edge has to meet the gutter properly anyway. Doing them a year later means paying for access twice.
Skylights, flues and solar panels
Every penetration needs a new flashing. Solar panels have to be taken off and put back by an electrician, which is a separate cost many people forget until the quote arrives.
Whatever is hiding under the old roof
Nobody can see rotten battens or damaged rafters until the old roof is off. A good quote tells you how surprises will be handled: a set rate, or a stop and a phone call before any extra work. If a quote says nothing about it, ask.
How to read a roof quote without getting caught out
Lay your quotes side by side and check these points before you compare the totals:
- Which Colorbond product and profile, and in which colour
- Removal and disposal of the old roof, including asbestos if any
- Batten work, fixings and tie downs
- Insulation blanket or sarking
- Gutters, fascia, downpipes, ridge capping and all flashings
- Scaffolding and edge protection
- How hidden damage will be priced
- Manufacturer and workmanship warranties, in writing
Also check who is doing the work. In Victoria, roof plumbing has to be done or supervised by a licensed roof plumber, who issues a compliance certificate for the work. Ask for the licence number. It’s also worth asking whether your job needs a building permit, especially for a structural change or if your street falls under a heritage overlay. A roofer who works locally should be able to tell you straight away.
When one quote is much lower than the rest, it is almost always missing something on that list. When one is much higher, it may simply include things the others left out. The total on its own tells you very little.
Sometimes a restoration is the better spend
Not every tired roof needs replacing. If the sheets are sound and the problem is faded paint, a few leaks or worn flashings, a repair or restoration can buy you years for a fraction of the outlay. Our breakdown of roof restoration costs sets out what that path involves.
Replacement makes sense when the steel is rusting through, the tiles are failing faster than you can fix them, or you’re spending money on the roof every winter with nothing to show for it. Rust that has eaten through the sheet can’t be painted away. Neither can a roof frame that has sagged under heavy tiles for decades.
We’ll tell you honestly which one your roof needs. If a repair will do the job, that’s what we’ll quote. When it really is time, our Colorbond and metal roof replacement service covers the whole job, from stripping the old roof to the final flashing.
A real number starts with a measure
The only figure that means anything is one based on your roof, measured in person, with every item on the list above spelled out. Book a measure and quote for your Mornington Peninsula roof replacement and we’ll walk you through each line before you decide anything.
Common questions about Colorbond roof replacement
How much does a Colorbond roof replacement cost?
It depends on the size and shape of the roof, what is being removed, the grade of steel and the extras included. A simple gable roof replacing old metal costs far less than a complex hip roof replacing tiles on a two storey home. A proper measure and an itemised quote is the only reliable way to get a figure.
What is the most expensive part of replacing a roof?
The new sheeting and the labour to lay it are usually the biggest line. Removing a heavy tile roof, scaffolding on difficult sites and any asbestos removal can add a large amount on top. On coastal homes, the step up to a heavier duty steel grade also lifts the materials cost.
What time of year is the cheapest to replace a roof?
Roofing doesn’t really have sale seasons, so the price itself rarely changes much through the year. What changes is scheduling. Wet winter weather causes delays and the peninsula gets busy over summer, so booking early gives you more choice of dates.
What is the typical lifespan of a Colorbond roof?
A well installed Colorbond roof lasts a long time, but how long depends heavily on how close you are to the coast and which product was used. BlueScope’s warranty terms change with distance from the sea, so ask your roofer for the warranty that applies to your address. Hosing down areas that rain doesn’t reach, such as under the eaves, helps in salty spots.
How do I know if a roof quote is too high?
Compare what each quote includes before you compare the totals. A higher quote often includes scaffolding, an insulation blanket, new gutters or a coastal grade of steel that a cheaper one leaves out. If two quotes cover the same items and are still far apart, ask each roofer to explain the difference.
Can you replace a tile roof with Colorbond?
Yes, and it’s one of the most common replacements on the peninsula. The tiles come off, the battens are adjusted to suit metal sheeting, an insulation blanket goes down and the new roof is fixed in place. Because steel is much lighter than tile, it needs to be properly fixed down against the wind.
