Roof Restoration Costs in Australia: A Practical Guide

Restoration cost depends first on roof size measured in square metres. A larger roof requires more cleaning time, more coating product, and more labour. Most quotes are provided per square metre or as a total based on a site inspection.

Current condition has a major impact. A lightly weathered roof with minimal moss and intact bedding may only need basic cleaning and coating. Severely degraded roofs with widespread moss, lichen, cracked tiles, or deteriorated pointing add significant time to cleaning, repair, and preparation. The worse the starting condition, the higher the cost.

Roof type changes what products and techniques are used. Tile restoration involves high-pressure cleaning, repointing ridge caps and hips with new mortar, rebedding where movement has occurred, replacing broken tiles, and applying primer and coating. Metal roof restoration skips the repointing but requires specialised rust treatment and metal-safe coatings. Concrete tiles cost less to coat than terracotta due to surface porosity differences.

Accessibility affects labour costs and safety equipment. A single-storey home with low pitch may be accessible with basic ladder work. A two-storey home with steep pitch requires scaffolding or harness systems, adding hundreds to thousands of dollars to the quote. Complex roof shapes with multiple valleys, dormers, or skylights increase labour time.

Coating choice also impacts pricing. Basic acrylic coatings are the most affordable and suit most residential applications. Premium thermal-rated or elastomeric coatings cost more per litre but offer better heat reflection, longer lifespan, and superior flexibility. Some manufacturers offer ten-year coating performance periods when applied to specification; others offer shorter periods with lower-tier products.

A proper restoration quote covers high-pressure cleaning to remove dirt, moss, and lichen. This includes treating organic growth with biocide to prevent immediate regrowth. Cleaning alone is not restoration; it is preparation for the restoration steps that follow.

Broken tile replacement should be included within a reasonable allowance. Most quotes include up to 20 or 30 tiles. If your roof has extensive breakage, the quote should itemise the additional cost per tile. Tiles are matched as closely as possible to the existing profile and colour.

Full repointing and rebedding of ridge caps and hips is essential for tile roofs. Old mortar is removed, ridge caps are rebedded in fresh mortar on a bed of flexible pointing compound, and the leading edge is repointed. This step prevents water ingress along the ridgeline and secures loose caps. Metal roofs skip this step but may include fastener replacement or rust treatment.

Primer application prepares the surface for coating. Primer improves adhesion, seals porous surfaces, and ensures even coating coverage. Skipping primer results in poor coating performance and early failure. Two coats of protective coating follow the primer, applied at the manufacturer-specified spread rate, not thinned to save product.

Final cleanup includes removing all debris, clearing gutters and downpipes, and leaving the property in clean condition. Gutter clearing is often included as part of restoration because debris from cleaning and coating work accumulates in gutters.