Roof Restoration Cost Calculator
Use Monolith Roofing’s Roof Restoration Cost Calculator to estimate the price range for restoring your existing roof. The tool models high-pressure cleaning, targeted repairs, rebedding and repointing (for tiled roofs), sealing and coating systems, and optional repainting—plus practical allowances such as scaffolding, gutter cleaning and valley spot repairs. Results display a low–high range you can toggle to show ex-GST or GST-inclusive totals.
How to use the calculator
- Enter roof area (m²) — the tool applies a standard 5% restore-waste factor.
- Set pitch (degrees) — costs increase by $3/m² per degree above 30°.
- Choose roof material — Concrete tile, Terracotta tile, or Metal (Colorbond®/coated steel).
- Select region — Sydney multiplier; Wollongong adds a typical fixed uplift.
- Select system — Tiles: clear sealer or sealer + 2-coat colour. Metal: 2-coat membrane or primer + membrane.
- Add scope items — cleaning, tile replacements, leak/flashings fixes, rebedding/repointing (tiles), repainting if your chosen system doesn’t already include colour, scaffolding, gutter clean, valley spot repairs.
- Set contingency and toggle GST — the calculator instantly updates the range.
Note: This tool is a guide only. Final quotation depends on site inspection, measurements, product selection and installation conditions.
What costs are included?
- Cleaning — high-pressure wash of the roof surface.
- Repairs — broken tile replacement; minor leak/flashings fixes.
- Ridge work (tiled roofs) — rebedding and repointing to restore ridge integrity.
- Sealing & coating — clear sealers or full membrane colour systems (tiles and metal).
- Repainting — only when not already included in the chosen system.
- Optional site items — scaffolding allowance, gutter clean & flush, valley iron spot repairs.
- Region factors — Sydney multiplier and a typical Wollongong fixed uplift for logistics.
- Commercial settings — contingency %, discount %, and GST toggle.
Roof types this calculator supports
Concrete tile
Common across Sydney and NSW. Restoration often combines broken-tile replacement, ridge rebedding/repointing, and a sealer + colour membrane for a uniform finish.
Terracotta tile
Premium appearance with excellent colour retention. Restoration typically includes selective repairs, careful cleaning, repointing, and compatible membrane systems.
Metal (Colorbond®/coated steel)
Coated steel roofs benefit from surface preparation, cleaning, and modern membrane systems. Primer + membrane paths are used for chalked or aged coatings.
Typical pricing signals (rule of thumb)
- Area: Larger roofs add cost but can improve per-m² efficiency.
- Pitch: Over 30° drives access and time (+$3/m²/degree).
- Condition: Cracked tiles, aged coatings, moss/lichen, and prior leak points increase scope.
- System selection: Clear sealers cost less than full colour membrane systems.
- Region & logistics: Crew availability and travel impact totals (Sydney vs regional).
- Optional items: Scaffolding, gutter cleaning and valley work add modest but meaningful allowances.
When to Request a Formal Quote
The calculator converts unknowns into a realistic range; a site inspection turns that range into a firm, itemised price and timeline. Request a formal quote if you:
- Want price certainty and a confirmed installation window (next 3–6 months).
- Are arranging finance, sale/purchase, or insurance and need an itemised figure.
- See signs of underlying issues (soft spots, rust trails, leaks, loose ridge capping).
- Have higher-pitch roofs, complex geometry, or many penetrations (skylights, chimneys, solar).
- Need guidance on system choice (e.g., clear sealer vs colour membrane; primer requirements on metal).
What you’ll receive: verified measurements and condition report; detailing plan for ridges, flashings and penetrations; system options with pros/cons and expected service life; itemised price with allowances and target installation window.
Frequently Asked Questions
What drives roof restoration cost the most?
Material/system choice, roof area, pitch above 30°, condition (repairs, ridge work), and optional items (scaffolding, gutter clean, valley repairs). Region also contributes.
Does a colour membrane include repainting?
Yes. If your selected system includes colour coats, separate repainting isn’t required. The calculator disables repainting in those cases.
Is restoration cheaper than full replacement?
Typically yes, particularly when structure and battens are sound. The calculator focuses on restoration scope only; ask us for a replacement comparison if needed.
How accurate is the calculator?
It provides a realistic range using current allowances. Final pricing depends on inspection, measured quantities, substrate condition and access.
Can I use this for metal roofs?
Yes. Choose the metal system (2-coat membrane or primer + membrane) and add any leak/flashings fixes or optional items.