If your tile roof is shedding grit into the gutters, cracking underfoot and needing repointing every few years, you have probably started wondering whether to keep patching it or switch to metal. A tile to metal roof conversion (some people call it "tile to tin", others a tile to Colorbond® reroof) is the replacement Central Coast homeowners ask us about most. It is also a genuinely different decision from a straight restoration. This guide covers what a conversion costs here, what happens on the roof day by day, how the two materials compare in our salt air, and how to tell whether converting is the smart spend or an unnecessary one.
The short answer: most Central Coast homes we convert fall between $20,000 and $40,000, the work takes 3 to 7 days, and the new roof is up to 90% lighter than the tiles it replaces. Whether it is worth it comes down mostly to the condition of your tiles, and we cover that further down.
A conversion replaces the whole roof system, not just the tiles
A conversion means removing your existing tiles (and usually the old battens and sarking beneath them) and replacing the whole covering with a metal roof, most commonly Colorbond® steel. It is more than a re-roof over the top: the old system comes off, the structure is checked, and a new, lighter, fully sealed metal system goes on in its place.
The battens are the part people do not expect. Tile battens are laid out to suit the tiles, and metal sheets fix to a different layout, so the old timber usually comes off with the tiles and new battens go on to suit the sheeting. The frame underneath is a different story. Because the new roof weighs so much less, the job is rarely about strengthening rafters and far more often about fixing the odd tired or rotten piece we find once the tiles are off.
It is one of the bigger investments you can make in your home, but for the right house it pays that back in lower maintenance and a much longer service life.
Why Central Coast homeowners are switching to metal
The Central Coast climate is hard on tile. Salt-laden air from Terrigal through to Umina, driving coastal rain, strong winds and relentless summer UV all work at the weak points of a tiled roof: the mortar bedding, the pointing and the porous surface of ageing tiles. Once tiles become brittle and the pointing cracks, wind-driven water finds its way under the caps and into the roof cavity. Owners typically start looking at metal when:
- The tiles themselves are failing: widely cracked, porous or delaminating, not just the odd broken one. If water soaks into the tile rather than beading off, the tile is done.
- Leaks keep coming back despite repairs and repointing.
- They are tired of the upkeep a tiled roof needs to stay watertight in a coastal environment.
- The roof structure is under strain and a lighter covering would help.
- They want a modern look and the clean lines of a Colorbond® profile.
We see it most on exposed streets near the water, around Avoca Beach and Bateau Bay for example, and on the solid 1970s and 80s family homes that owners are renovating for the long haul.
Tile versus metal: how they really compare
Neither material is simply "better". They suit different homes and priorities. Here is how they stack up for a typical Central Coast property:
- Weight. An old concrete tile roof weighs around 45kg per square metre. Colorbond® weighs around 5kg. That takes a lot of load off your roof frame and walls, which can matter on older homes.
- Lifespan. Properly installed and maintained, a Colorbond® roof lasts 40+ years even in coastal conditions, and inland roofs can see 50+. Tile can also last a long time, but only if the pointing and bedding are kept up.
- Maintenance. Metal has no mortar to crack or repoint and far fewer entry points for water. Tile needs periodic repointing and tile replacement to stay sound.
- Wind. Tiles can lift and crack in a big blow. Metal sheets are screwed down along their length.
- Coastal durability. For homes near the water, the grade of steel matters. Our rule of thumb is that within 1km of breaking surf calls for marine grade steel and stainless fasteners, and 1 to 5km still needs upgraded fasteners and careful detailing.
- Look. Tile offers a traditional profile; metal gives crisp, contemporary lines in the full Colorbond® range, in corrugated or concealed fix profiles.
- Noise and heat. Modern metal roofs go on over sarking and an insulation blanket, which brings rain noise down to tile roof levels and keeps summer heat in check. The old tin shed reputation comes from roofs with no insulation at all.
For beachfront homes there is also a tougher grade again, and our guide on when Colorbond Ultra is worth paying for explains which streets need it and which do not.
What a tile to Colorbond conversion costs on the Central Coast
Most tile to metal conversions we quote on the Central Coast come in between $20,000 and $40,000, depending mainly on the size of the roof and how easy it is to get to. That is broadly the same range as replacing the roof like for like with new tiles, because the big costs (stripping, disposal, battens, sarking, flashings and labour) are there either way.
People often ask whether $30,000 is too much for a roof. For a conversion, that sits in the middle of our usual range, so on its own it is not a red flag. What matters is what the number includes. A quote that looks cheap often leaves out removal and disposal of the old tiles, new sarking and insulation, or scaffolding on a two-storey home, and those turn up later as extras.
Which is more expensive, tiles or Colorbond? Per square metre, concrete tiles are the cheaper material, at around $40 to $70 supplied and installed against around $90 to $200 for Colorbond®. But that comparison only applies if you are putting a new roof on anyway. If your tiles are sound, a restoration costs a fraction of either. Our breakdown of roof replacement costs on the Central Coast goes through the full numbers by material and roof size.
The things that move your price within that range:
- Roof size and complexity: the area of sheeting plus the number of valleys, hips and penetrations.
- Removal and disposal of the old tiles, battens and sarking. We include this in every replacement quote.
- Structural repairs uncovered once the tiles are off. We photograph them and quote them before going ahead, so they never land on the final invoice as a surprise. Minor batten replacement is common and inexpensive.
- Pitch and access: steep or two-storey roofs need scaffolding and more safety setup.
- Product choice: standard versus marine grade Colorbond®, and the profile and colour selected.
- Extras: new gutters, fascia covers, an insulation blanket, and taking solar panels off and putting them back.
Because every roof is different, the only reliable figure comes from someone standing on yours. Our quotes are free and written, with each of those items listed.
How the job runs, from quote to clean-up
Done properly, a tile to metal conversion is a staged job, not a quick swap. Most homes take 3 to 7 days from start to finish, and you can stay home the whole time. The work is all outside, though the stripping days are noisy and we will warn you which ones they are. Here is how it typically runs:
1. Inspection and quote. We assess the tiles, the roof frame, the pitch and access, and confirm whether your structure suits a metal system. You get a clear written quote, including disposal, before any work starts.
2. Profile, colour and grade. You choose the profile and colour against your actual house, and we write the steel grade and fasteners your distance from the surf calls for into the quote rather than assuming them. Materials are ordered and the job is booked around a weather window.
3. Removal of the old roof. The tiles are stripped in stages and taken away, along with tired battens and old sarking. We never strip more roof than we can close up before weather can reach it, so your home stays weatherproof throughout. This is also when any hidden issues in the frame come to light.
4. Structural check and prep. The rafters and framing are inspected and any damaged or rotten timber is repaired so the new roof sits on a sound base.
5. Sarking, insulation and battens. New sarking and an insulation blanket go on, along with new battens set out for the sheeting. With the roof open, this is the one chance you get to add insulation cheaply.
6. Installing the metal sheeting. The sheets are cut, laid and fixed in your chosen colour, with correct laps, new flashings, ridge capping, valleys and penetrations sealed properly. This is the core of our Colorbond re-roofing work, and it is where coastal detailing makes or breaks the roof.
7. Gutters, handover and clean-up. Guttering and downpipes are checked or replaced as needed. Old gutters on a new roof tend to fail first and look it, so most owners replace them at the same time. We do a final inspection with you, hand over photos and warranty documents, and run a magnetic sweep of the yard for stray screws.
The weak points of a metal roof, and how we deal with them
Metal is not trouble free, and anyone who tells you otherwise is selling something. The good news is that its problems are predictable, and most of them are decided on installation day.
The biggest one on the Coast is the wrong grade of steel near the beach. A roof that is perfect in Kariong can rust early at Terrigal. Close behind it are the fasteners: the rubber seals on roofing screws perish in the sun over 15 to 20 years, long before the steel does, and re-screwing with new sealed fasteners is the routine fix. Galvanic corrosion is the quieter one. Copper pipes or lead flashing touching steel will eat it slowly, so dissimilar metals have to be kept apart.
Salt also builds up in the spots rain never rinses: under a second-storey overhang, beneath the eaves, or tucked under a patio roof. A quick hose over the roof after a long dry spell genuinely extends coating life near the water. Within the salt zone we suggest a professional check every 2 to 3 years, and every 3 to 5 years inland.
When restoring the tiles is the smarter spend
Conversion is not always the right answer. If the tiles themselves are still in good shape and only the surface coating and pointing have aged, a full tile roof restoration (clean, repairs, repointing and a fresh protective coating) is usually the smarter, more affordable spend. Restoration makes sense when:
- The tiles are sound, not widely cracked or crumbling.
- You are happy with a tiled look and want to refresh rather than replace.
- Budget is the priority and the roof still has years of life in the tiles.
Converting to metal earns its keep when the tiles are genuinely at the end of their life, when the roof structure would benefit from a lighter load, or when you want to be free of the tile and mortar maintenance cycle for good. A roof at 40 to 60 years old that has never had major work is often in that camp. At the inspection we will tell you honestly which camp your roof sits in. We would rather steer you to a straightforward restoration than sell you a conversion you do not need.
Get a straight answer on your roof
Our licensed local team (NSW Licence #203374C) has restored, replaced and converted roofs right across the Central Coast, from Gosford and Erina through to Toukley. Rather than guess from an online range, start with a free inspection and a written recommendation for your roof specifically. If converting is the right move, our metal roofing team will quote the full job, grade, gutters and all, so you know exactly what you are paying for.