Roof Replacement Cost Calculator (Australia)
Indicative supply & install pricing only — real quotes depend on site inspection, materials, access and scope. Use this tool to get a fast ball-park figure, then book a site visit for an exact quote.
Estimated Roof Replacement Cost
View detailed breakdown
What drives roof replacement costs in Australia?
Peninsula roofing costs depend on five key factors:
- Total roof area: Measured including pitch and overhangs—typically 1.1–1.4× your floor area
- Material and profile: Colorbond steel vs concrete/terracotta tiles, with profile affecting labour time
- Pitch and complexity: Steep roofs and multi-valley designs require more safety equipment and skilled labour
- Access and storeys: Difficult sites with narrow access or double-storey heights increase setup costs
- Scope additions: Insulation, sarking, skylights, and new gutters significantly impact total cost
Colorbond vs tiles: Peninsula pricing realities
Material choice affects both supply and installation costs on the Peninsula:
Colorbond steel advantages
- Faster installation: Lighter sheets mean quicker progress, reducing labour costs
- Lower structural load: Existing frames rarely need strengthening
- Coastal performance: COLORBOND Ultra resists salt air corrosion better than standard steel
- Easier removal: Less disposal weight and time compared to tiles
Tile considerations
- Higher material cost: Concrete and terracotta tiles carry premium pricing
- Slower installation: Individual tile placement takes more time than sheet roofing
- Weight factors: May require structural assessment or beam upgrades
- Coastal durability: Salt spray can cause tile surface degradation over time
Peninsula conditions affecting your roof choice
Local weather patterns influence both performance and maintenance costs:
Coastal exposure
Properties within 1km of Port Phillip Bay face increased salt air exposure. COLORBOND Ultra performs better than standard steel in these conditions, while tiles may show surface erosion over 15–20 years.
Wind and weather
Peninsula southerlies and storm activity favour well-fastened metal roofing. Our installations exceed minimum fixing requirements for improved wind resistance.
Thermal performance
Both Colorbond and tiles benefit from proper sarking and insulation. The calculator includes sarking and bulk insulation options that significantly improve comfort and energy efficiency.
When restoration beats replacement
Not every roof needs full replacement. Consider roof restoration if:
- Structure and sarking are sound (under 25 years old)
- Only surface coating or minor repairs are needed
- Budget constraints make staged works preferable
- Council approval timeframes favour restoration scope
Our Peninsula specialists can assess whether restoration or replacement offers better value for your specific situation.
Roof replacement cost – FAQs
What's included in the calculator?
Supply & install of the chosen roofing, standard flashings, fixings, and any options you select such as sarking or gutters. Structural works and asbestos are excluded.
How accurate is the estimate?
It's a planning-level guide (±10–20%). We'll confirm after site inspection.
Colorbond or tiles — which costs more?
Material rates differ by region and profile. Colorbond is often lighter and faster to install; tiles can carry higher material cost and removal.
Do you service my suburb?
We cover the Mornington Peninsula & bayside — see locations.
Get a firm quote
Ready for precise pricing? Book a roof inspection or call 03 4162 7766. We service the Mornington Peninsula & bayside suburbs.