Restore, repair or replace, which does your roof actually need?

Short answer: repair fixes a single fault on an otherwise sound roof. Restoration resets a tired-but-sound roof for ten to fifteen years. Replacement is the answer once the metal is rusted through, more than a fifth of the tiles are cracked, or the repair list keeps growing. The decision is settled with photos from on the roof, not a guess from the ground.

The decision tree, in plain English

Every roof we look at sorts into one of three buckets. The job is to get yours into the right bucket before any money changes hands.

Repair

When: a specific fault on an otherwise healthy roof. A cracked tile or two after a hailstorm. A flashing the previous trades silicone-bombed instead of installing properly. A blocked box gutter that overflowed in the last big rain. The roof around the fault is sound; the rest has years in it.

Cost: $500 to $1,800 for most leak repairs in the Illawarra. A complex flashing rebuild on a two-storey job with scaffolding will run higher.

Risk if you delay: the fault widens. Water tracks through sarking into ceilings, batts and downlights. A $700 flashing repair becomes a $7,000 internal job by the second wet winter.

Restore

When: the roof is structurally sound but tired. The paint is chalking, the pointing is failing on the ridge caps, the screws on the metal are weeping rust spots. Twelve to twenty years old, no widespread structural problems. The job is to reset it for another decade or more, not rebuild it.

What good looks like: a high pressure clean, replace any cracked tiles or rusted fasteners, rebed and repoint ridge caps in fresh flexible pointing, two coats of a named membrane (Shieldcoat, Nutech or Dulux Acratex). The quote names the membrane and the colour, the prep work, and the warranty in years.

Cost: $4,000 to $12,000 in the Illawarra for a standard family-home roof.

Risk: the wrong roof gets restored. A coat of membrane over a roof that is structurally finished is paint hiding a problem. A working roofer tells you when restoration is the wrong answer.

Replace

When: the steel is rusted through, the tiles are widely cracked or porous (water absorbs rather than runs off), the roof is past 30 years and the repair quotes keep stacking up, or you are renovating below and the roof is on the list anyway. Replacement also tends to be the answer for a coastal home on the beachfront where salt has eaten the standard-grade Colorbond and only ultra-grade will see out another generation.

What good looks like: stripped to the battens, sarking and insulation upgraded as a line item (not assumed), new sheets or tiles laid with new fasteners, all flashings remade, gutters and downpipes addressed in the same job by a licensed roof plumber, height safety as a scoped line not padding, full waste removal.

Cost: $15,000 to $45,000 plus for a standard family home in the Illawarra; coastal ultra-grade, complex pitches and two-storey access push the top end higher.

Risk: spending replacement money on a roof that would have restored fine. A reputable roofer talks you out of replacement when the roof does not need it; that is the test of who you are dealing with.

What pushes a roof into the replace column on the South Coast

Three Illawarra-specific factors compress the timeline.

Salt air. Standard-grade Colorbond is rated for "moderate" coastal exposure (roughly 1 km from the coast). Houses east of the highway in Thirroul, Austinmer, Bulli and Wombarra sit in "severe marine" territory where ultra-grade is the right specification and standard grade halves its lifespan. If a previous roofer used standard grade where ultra should have gone, it will tell you in fifteen years, not thirty.

Hail. The escarpment funnels southerly hail events differently than open Sydney suburbs. Concrete tile takes hail well; older terracotta cracks. A single 2019-style hailstorm will retire a tile roof that was otherwise good for another decade.

Original 1960s and 70s installs. A lot of Illawarra roofs went on in one wave between 1965 and 1980. They are now well past 50 years on the tile and 40 on the original galvanised metal. They have had their innings. The question is whether to spend $3,000 on the third repair this decade or put that money toward the replacement that has to happen within five years anyway.

How to tell which bucket yours is in, without us

Look up at your eaves and ridge from the ground.

• Tile roof: are the ridge caps cement still smooth, or webbed with cracks and missing chunks? Are any tiles slipped, cracked or moss-covered in patches?
• Metal roof: are the screws weeping orange streaks down the sheet, or are the heads still tight and grey? Are the gutter inside edges blistered with rust, or sound?
• Both: stand in the ceiling space with a torch after the next solid rain. Brown streaks on the sarking or batts mean a leak that is already inside.

None of that replaces a roofer on the roof with a camera. It just tells you which conversation to have.

What we do

Every Ridgeline assessment includes photographs from on the roof, a one-page written report sorting the roof into repair, restore or replace with the reasoning named, and a fixed price for each option that applies to your roof. If repair is the right answer we will tell you, even when restoration would pay us more. The job is to be the roofer you call back in fifteen years, not the one who restored a roof that should have been replaced.