Tile vs Colorbond roof: cost, weight, heat, noise and lifespan compared

For most Australian houses, re-roofing in pre-painted steel (widely known by the BlueScope brand name Colorbond) costs less than a new terracotta tile roof and sits in a similar range to new concrete tiles, once removal, battens and sarking are included. On this site's illustrative ranges, tile to steel runs about $90–$160 per m² of roof surface, a concrete tile re-roof about $80–$140 per m² and terracotta about $120–$220 per m². Steel wins on weight, speed of installation and low-pitch performance; tiles win on thermal mass, rain noise and, for terracotta, colour stability and heritage fit. The right choice depends on your frame, your street, your site's bushfire and wind ratings and how long you plan to stay.

This guide is part of the roof replacement cost overview.

The three main materials at a glance

Factor	Pre-painted steel	Concrete tile	Terracotta tile
Weight on the frame	Light	Heavy	Heavy
Minimum pitch	Low pitches possible with suitable profiles	Needs a steeper pitch than steel	Needs a steeper pitch than steel
Installation	Long sheets, fewer joints, fast	Laid tile by tile on battens	Laid tile by tile on battens
Rain noise	Louder unless insulated	Quieter	Quieter
Heat	Reflects heat well in light colours; low thermal mass	More thermal mass, slower to heat and cool	More thermal mass, slower to heat and cool
Surface	Factory paint finish; scratches need touch-up	Surface coating fades over time	Fired colour, does not fade like a coating
Typical upkeep	Check fixings, flashings, cut edges, gutters	Ridge pointing, broken tiles, possible recoating	Ridge pointing, broken tiles
Illustrative re-roof range per m²	$90–$160 (from tile)	$80–$140	$120–$220

The ranges are illustrative examples used on this site, not market data. They include GST, removal of the old roof and standard sarking, and exclude gutters, structural repairs and special bushfire or cyclone details.

Why the cost gap is narrower than people expect

People often assume steel is far cheaper than tiles. The material can be cheaper per square metre, but switching from tile to steel adds steps:

Removing the tiles. Heavy tiles take time to strip and cost more to dispose of than old sheets.
Batten changes. Tile battens are spaced for tiles. Steel sheets need battens at spacings set by the sheet manufacturer's span tables and your wind classification, so some or all battens may be replaced or supplemented.
Sarking or blanket. Many tile roofs have no sarking. A steel roof is usually installed with a reflective foil or an insulation blanket to manage condensation, heat and noise.
New flashings. Every wall junction, chimney, skylight and vent needs a new steel flashing.
Tie-down checks. A lighter roof is more easily lifted by wind, so the connection between roof and walls matters more. In higher wind classifications the fixings and tie-downs may need upgrading.

On a like-for-like basis, therefore, a tile-to-steel conversion is closer to a new concrete tile roof than a straight steel re-sheet would be.

Worked comparison for one house (illustrative)

A single-storey house in a suburban area has 205 m² of roof surface, a hip roof and an old concrete tile roof with cracked tiles and no sarking. Three options are priced with this site's illustrative mid-range rates.

Option	Rate per m² (illustrative)	Area cost	Fixed costs	Total
Restore the concrete tiles	$45	205 × 45 = $9,225	$2,000	$11,225
New concrete tiles	$110	205 × 110 = $22,550	$4,500	$27,050
Pre-painted steel	$125	205 × 125 = $25,625	$4,500	$30,125
New terracotta tiles	$170	205 × 170 = $34,850	$4,500	$39,350

The restoration looks cheapest, but it is only an option if the tiles are sound. The tiles on this house are cracked and porous, so restoration would be throwing money at a short-term fix. Between new concrete tiles and steel, the difference here is about $3,000. Over a long ownership, the deciding factors may be heat, noise, appearance and upkeep, not price alone. You can rerun these numbers with the re-roof cost estimator.

Heat, noise and comfort

Heat. Light-coloured steel reflects a large share of the sun's energy, and a sarking or blanket under the sheets cuts radiant heat into the ceiling space. Dark steel absorbs more heat. Tiles have more thermal mass, so the ceiling space warms and cools more slowly. In practice the insulation in your ceiling and the ventilation of the roof space matter as much as the roof material. The National Construction Code sets energy efficiency requirements for new work; your contractor or certifier can tell you what applies to a re-roof.

Noise. Rain on a steel roof is louder than on tiles, especially on a bare roof with no blanket. An insulation blanket under the sheets and ceiling insulation reduce the sound a lot. If you work from home or sleep in a room under a low ceiling, ask for the blanket option in writing.

Condensation. Steel roofs can form condensation on their underside in cold, humid conditions. Sarking or a blanket with a vapour-permeable layer, plus roof space ventilation, manages it.

Bushfire, wind and hail

Bushfire. Both steel and tiles can be used in bushfire-prone areas, but the details differ by bushfire attack level under AS 3959: sarking, ember-proofing of gaps, ridge and valley details and gutter guards. See bushfire and wind requirements.
Wind. In cyclonic regions of Queensland, Western Australia and the Northern Territory, steel roofing is common and the fixing pattern, batten size and tie-downs are engineered for the wind classification.
Hail. Large hail can dent steel and crack tiles. Dents may be cosmetic; cracked tiles let water in. How your insurer treats each is set out in your product disclosure statement. See storm damage versus wear and tear.

Heritage and neighbourhood rules

If your property is in a heritage conservation area or heritage overlay, changing from terracotta to steel can need approval, and the council may require a specific profile or colour. Some housing estates also have covenants on roof materials. Check before you sign. See council approval for re-roofing.

Decision checklist

Is the frame sound, and has anyone checked whether it can carry tiles if you are going from steel to tiles?
What are your site's bushfire attack level and wind classification?
Are you in a heritage area or covered by an estate covenant?
Does each quote include battens, sarking or blanket, flashings and gutters?
What product warranty applies, and does it depend on your distance from the coast or industry?
How long will you own the house, and do you value quiet, looks or low upkeep most?

Frequently asked questions

Can I put a steel roof over existing tiles?

No. Tiles must be removed first; a steel roof is fixed to battens, not laid over a tile roof. Some contractors install steel over an existing old steel roof in limited situations, but stripping and re-sheeting is the usual approach.

Can I change from steel to tiles?

Possibly, but tiles are much heavier, so an engineer or the contractor should check that the rafters, trusses and walls can carry the extra load. The roof pitch must also suit the tile.

Does the steel colour affect the product warranty?

Manufacturer warranties for pre-painted steel usually depend on the product, the environment (distance from breaking surf or heavy industry) and correct installation. Ask for the warranty document for the exact product and your location before you sign.

Which lasts longer?

All three can last decades when correctly installed and maintained, but lifespan depends on the product, the environment and workmanship. Rely on the written product warranty and the contractor's statutory warranty rather than marketing claims.

Sources

Australian Building Codes Board — National Construction Code energy efficiency and weatherproofing requirements
Standards Australia — AS 3959 bushfire construction and AS 4055 wind loads for housing
Queensland Building and Construction Commission — consumer guidance on choosing and contracting roofing work
Consumer Affairs Victoria — planning a renovation and contracts