At-a-Glance Roof Insulation Pricing
- Supply-only roof insulation: $8–$25 per m² (batts/blanket/foil; varies by R-value & brand)
- Installed by a pro: $35–$70 per m² for straightforward access; $70–$110+ per m² for tight access/complex roofs
- Note: Metal roofs often use roof blanket (Anticon); tiled roofs often use ceiling batts. Prices vary by R-value, roof size, access & pitch.
Roof insulation is one of the best investments you can make in your Australian home's comfort and energy efficiency. Whether you're dealing with scorching summer heat or winter chill, proper insulation makes a dramatic difference—but costs vary significantly based on your roof type, access, and insulation choice.
This guide breaks down real-world roof insulation costs across Australia, with specific insights for Mornington Peninsula and SE Melbourne conditions. We'll cover everything from budget DIY options to premium professional installations.
Quick Price Table (by roof size & insulation type)
| Roof Size | Supply-Only Cost | Professionally Installed |
|---|---|---|
| Small (≤120 m²) 3-4 bedroom home |
$1,000–$3,000 | $4,500–$9,000 |
| Medium (121–220 m²) 4-5 bedroom home |
$1,800–$5,500 | $7,000–$16,000 |
| Large (220–350 m²) 5+ bedroom/complex home |
$3,000–$8,750 | $12,000–$28,000 |
Price drivers: Metal roof blanket (foil + bulk insulation) costs more than basic batts. Higher R-values increase material costs. Complex roofs with multiple levels, penetrations, or poor access require significantly more labour time.
Cost Per m² (Supply vs Installed)
Here's what you can expect to pay per square metre for different insulation types:
Ceiling Batts (Above Plasterboard)
- Supply: $8–$18 per m² (varies by R-value and brand)
- Professionally installed: $35–$60 per m²
- Best for: Tiled roofs, retrofit projects with good ceiling access
Roof Blanket (Anticon for Metal Roofs)
- Supply: $14–$28 per m² (foil-faced glasswool)
- Professionally installed: $50–$90 per m²
- Best for: Metal roofs, combines thermal and condensation control
Rigid Boards & Specialty Products
- Supply: $25–$45 per m² (PIR, XPS, specialist systems)
- Professionally installed: $70–$110+ per m²
- Best for: Limited space applications, high-performance requirements
What drives the price difference? Brand reputation, R-value rating, product thickness, integrated vapour barriers, wastage factors, and fixing/fastening systems all impact the final cost. Premium brands with proven coastal performance cost more but often provide better long-term value.
Key Factors That Change the Price
Roof Access & Complexity
This is the biggest cost variable for professional installation:
- Easy access, low pitch: Base pricing applies
- Steep pitch (>30°): Add 30-50% to labour costs
- Multi-storey/high roofs: Safety equipment adds time and cost
- Tight roof cavities: Slower installation, higher labour rates
- Complex rooflines: Hips, valleys, dormers require careful cutting and fitting
Roof Material Considerations
- Metal roofs: Usually require roof blanket under the sheets
- Tiled roofs: Often use ceiling batts; different access requirements
- Age of roof: Older roofs may need repair before insulation
R-Value & Performance Requirements
Higher thermal performance costs more but provides better long-term benefits:
- Basic performance (R1.8-R2.5): Lower cost, adequate for mild climates
- Good performance (R2.5-R3.5): Most popular choice around Melbourne
- High performance (R4.0+): Premium cost, maximum energy savings
Additional Cost Factors
- Old insulation removal: $8-15 per m² (if required)
- Penetration sealing: Skylights, flues, downlights
- Vapour barrier upgrades: Essential for coastal areas
- Safety requirements: Edge protection, harness systems
- Regional labour rates: CBD/premium areas cost more than outer suburbs
Metal Roofs vs Tiled Roofs (What We Use Locally)
The Mornington Peninsula's coastal conditions and prevalent roof types affect both insulation choice and pricing:
Metal Roofs (Colorbond, Corrugated)
Most Peninsula homes have metal roofing, which typically uses foil-faced roof blanket (Anticon) under the sheets. This approach:
- Combines thermal insulation with condensation control
- Provides excellent rain noise reduction
- Costs more than basic batts but delivers better coastal performance
- Installation requires working under the roof sheets or during roof restoration
Tiled Roofs (Clay, Concrete)
Traditional tiles often use ceiling batts above the plasterboard ceiling:
- Easier retrofit installation from inside the home
- Sarking layer serves a different purpose than insulation
- Good thermal performance, limited condensation benefits
- Generally lower installation costs due to better access
Coastal considerations: Peninsula properties need marine-grade fasteners and vapour-resistant products. Proper installation detailing is crucial to prevent condensation issues that can damage roof structures over time.
Is Insulation Worth It? (Payback & Comfort)
Roof insulation provides multiple benefits that justify the investment:
Energy Savings
- Summer cooling: 20-40% reduction in air conditioning costs
- Winter heating: 15-30% reduction in heating bills
- Typical payback: 3-7 years depending on energy usage
Comfort Improvements
- More consistent indoor temperatures
- Significantly quieter during rain (especially metal roofs)
- Reduced condensation and moisture problems
- Better indoor air quality
Property Value
Quality roof insulation adds value by improving energy efficiency ratings and buyer appeal. Many Peninsula buyers specifically look for well-insulated homes given our climate extremes.
Local Pricing – Mornington Peninsula & Bayside
Local jobs on the Mornington Peninsula typically fall within the ranges outlined above, but several factors can push costs higher:
- Coastal access: Some Peninsula properties have challenging access requiring specialised equipment
- Wind exposure: High-exposure sites need more robust fastening systems
- Heritage restrictions: Some areas have specific requirements affecting material choice
- Local demand: Premium suburbs often have higher labour rates
We regularly work across Mount Eliza, Mornington, Mount Martha, and the broader bayside area. Most projects land within our quoted ranges, but complex or difficult-access properties may require site-specific pricing.
The key is getting a detailed written quote that accounts for your specific roof design, access requirements, and performance goals.
Get a Fast, Local Quote
Every roof is different, and the best way to get accurate pricing is with a site inspection. We provide detailed written quotes covering materials, labour, and any additional requirements specific to your property.
Our experienced team understands Peninsula conditions and can recommend the most cost-effective insulation solution for your home and budget.
Ready to Improve Your Home's Comfort?
Get a detailed quote for roof insulation that suits your Peninsula home's specific needs and budget.
Get a Fast Quote 03 4152 7766Frequently Asked Questions
What's the best insulation for a metal roof?
Roof blanket (also called Anticon) is typically the best choice for metal roofs. This combines foil-faced glasswool with the correct R-value and vapour barrier. Popular options are R1.8 to R2.5 depending on your climate zone and energy goals.
What R-value should I choose around Melbourne?
For roof blanket under metal roofs, R2.5–R3.5 is commonly used around Melbourne. For ceiling batts above plasterboard, R3.0–R6.0 depending on your energy efficiency goals. Higher R-values cost more but provide better thermal performance.
Do I need sarking as well as insulation?
Sarking and insulation serve different purposes. Sarking is a reflective membrane that reduces radiant heat transfer, while bulk insulation provides thermal resistance. Many roof blanket products combine both functions in one product.
How long does roof insulation installation take?
Often 1 day for small, simple roofs with good access. Medium to large roofs typically take 2–3 days. Complex roofs with difficult access, multiple penetrations, or old insulation removal can take longer.
Can you insulate under an existing roof?
Yes, in most cases. For metal roofs, this is often done from below through the roof cavity. For tiled roofs, ceiling batts can be installed above the plasterboard ceiling. Access and roof design affect the approach and cost.
Will roof insulation help with condensation and noise?
Yes, with the right system and proper installation. Foil-faced insulation acts as a vapour barrier to prevent condensation, and bulk insulation significantly reduces rain noise on metal roofs. Proper detailing is crucial for best results.
Do you remove old insulation?
Old insulation removal is available on request but adds to the cost. This is recommended if the old insulation is damaged, compressed, or moisture-affected. Clean removal and disposal typically adds $8–$15 per m² to the project.
Understanding roof insulation costs helps you make an informed investment in your home's comfort and energy efficiency. Whether you choose a budget-friendly DIY approach or professional installation with premium materials, proper insulation provides excellent long-term value for Australian homeowners.
For roof repairs or comprehensive insulation solutions on the Mornington Peninsula, our experienced team provides detailed quotes and professional installation backed by industry warranties. If your insulation issues started with a leak or damage, we offer expert roof repairs in Mornington to address the root cause before installing new insulation.
Last updated: September 25, 2025