How do I know if my roof needs repair or replacement?

Six factors matter most: roof age, number of recent leaks, extent of visible damage, structural sag/ceiling staining, energy bill changes, and how long you'll stay in the home. Use Crown Roofers' free 6-question quiz to score these and get a clear repair-vs-replace recommendation with cost estimates.

At what age does a roof typically need replacement?

Colorbond and metal roofs commonly last 30–50 years. Concrete tile roofs typically last 30–50 years but may need re-pointing and re-bedding at 20–30 years. Terracotta tile roofs can last 50–75 years with proper maintenance. Over 30 years old with multiple issues, full replacement is usually more cost-effective long term than ongoing repairs.

How much does a roof repair cost in Sydney?

Minor repairs typically run $300–$800 (a few broken tiles, small leak fix). Targeted repairs across multiple sections cost $1,500–$3,500. Extensive repairs approaching partial replacement run $4,000–$8,000. Crown Roofers gives a free written quote before any work begins.

How much does a roof replacement cost in Sydney?

Full roof replacements in Sydney range $12,000–$35,000. Colorbond re-roofs sit at the upper end ($15,000–$35,000), concrete and terracotta tile re-roofs around $12,000–$28,000. Factors: roof size, pitch, access difficulty, material choice, and whether battens/sarking need replacement.

What's the biggest red flag that means replace not repair?

Visible sagging or dips in the ridge line. That signals rotted rafters or structural overload — often from old concrete tiles plus water saturation. This is unsafe and not repairable in isolation. It requires a licensed roof plumber on-site within days and usually means a full structural and roof replacement.

60-second diagnostic

Should I repair or replace my roof?

Answer 6 questions. We'll score your roof on age, leaks, damage, structure, energy and time horizon — then tell you whether targeted repair, partial replacement, or full re-roof is the smart call. With Sydney cost ranges for each.

How this quiz works

The 6 factors that decide repair vs replace

The repair-or-replace decision isn't binary — it's a weighted score across six independent factors. Crown Roofers' quiz uses the same framework our licensed inspectors apply on every site visit. We've tuned the weights from our Sydney roof inspections, weighted toward the factors that most reliably predict whether a roof can be patched economically or has crossed into end-of-life.

Age is the strongest single predictor. A Sydney concrete tile roof under 20 years old is almost always repairable; over 30 years old it's almost always replacement territory. Colorbond roofs last 30–50 years depending on coastal salt exposure. Terracotta lasts 50–75 years and is rarely a hard replacement candidate unless structural issues are present.

Leak count and damage extent jointly indicate whether the failure is localised or systemic. One isolated leak from a cracked tile or failed flashing is a $400 repair. Three or more leaks across multiple rooms is a systemic envelope failure — repairing each point individually costs more than re-roofing and only buys you 12–18 months before the next leak appears.

Sagging or visible dips in the ridge line is the strongest red flag. It indicates either rotted rafters or structural overload (usually old concrete tiles plus water saturation). Any visible sag triggers a structural inspection and almost always means a full re-roof plus rafter repair. Don't ignore this — it's a safety issue.

The last two factors — energy bill change and time horizon — are about ROI rather than urgency. If your bill has jumped without lifestyle changes, the roof is likely failing as an insulation envelope. If you're staying 5+ years, replacement amortises better than repeated repairs.