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Ready to get started? This estimate gives you a good indication of costs, but we recommend getting quotes from local installers for your specific project.
Talk to an InstallerHow this cosy roof cost calculator works
This cosy roof cost calculator is specifically designed for UK homeowners looking to upgrade their conservatory or extension with a warm, insulated roof. Unlike generic roofing calculators, this tool focuses on the specific requirements and typical UK roofing prices for 2025.
The calculator considers multiple factors that affect conservatory roof replacement cost UK including your roof size (measured in m²), choice of material (tiled warm roof system, insulated solid panels, glass, or polycarbonate), structural complexity, your region, and any additional extras like plastering, lighting, or structural work.
You'll receive an instant estimate showing both the total cost range and the conservatory roof cost per m². The tool also calculates approximate installation time and potential energy savings, helping you understand the long-term value of upgrading to an energy efficient conservatory roof.
Important: These estimates are for guidance only. Actual quotes from installers may vary based on your specific site conditions, access requirements, existing structure, and current market rates. We always recommend obtaining at least three quotes from qualified installers.
Typical cosy conservatory roof costs per m²
Understanding the conservatory roof replacement cost per m² helps you budget realistically. Here are typical price ranges for different roof types in the UK:
- Tiled warm roof systems: £300 – £700 per m² (most popular choice for solid tiled conservatory roof conversions)
- Insulated solid panel systems: £250 – £550 per m² (lightweight tiled roof for conservatories alternative)
- Glass roofs: £185 – £500 per m² (modern, light-filled option but lower insulation)
- Polycarbonate roofs: £120 – £250 per m² (budget option, minimal insulation)
These are guide prices only. The actual insulated conservatory roof price you pay will depend on your project's specific requirements, chosen materials, and regional labour cost for conservatory roof replacement.
What affects the cost of a warm or cosy roof?
Several key factors influence the final conservatory roof conversion cost:
- Roof size: Larger roofs cost more overall, though the cost per m² may decrease slightly for bigger projects
- Shape and complexity: Simple lean-to designs are most affordable, while Victorian, hipped, or L-shaped roofs require more materials and skilled labour
- Roof material: Solid tiled warm roof systems cost more than polycarbonate but offer far better insulation and U-value performance
- Insulation level: Upgrading to premium insulation with lower U-values increases upfront costs but improves energy efficiency and long-term savings
- Regional variations: London and the South East typically have higher labour rates than the Midlands, North, Wales, or Scotland
- Extras and upgrades: Internal plastering and painting, new LED spotlights, replacement gutters and fascias, or structural steelwork all add to the total
- Access and scaffolding: Difficult site access or the need for extensive scaffolding can increase costs
- Existing structure: Some conservatories may need structural strengthening before a heavier solid roof conservatory can be installed
Frequently Asked Questions
How accurate is this cosy roof cost calculator for UK prices?
This warm roof cost calculator UK tool uses realistic 2025 price ranges based on typical market rates for conservatory roof replacement cost UK. It factors in regional variations, material costs, and labour rates across different parts of the UK. However, it provides estimates only – actual quotes from installers can vary by ±15-20% depending on your specific project requirements, site conditions, installer rates, and current material availability. Always obtain multiple quotes for the most accurate pricing.
What is a "cosy" or "warm" conservatory roof?
A warm roof conservatory or cosy roof refers to a highly insulated solid roof system that replaces old glass or polycarbonate conservatory roofs. Unlike traditional conservatory roofs, an insulated warm roof system includes multiple layers of insulation, creating a thermally efficient barrier. This makes your conservatory usable year-round by keeping it warm in winter and cool in summer. Popular options include solid tiled conservatory roof systems and lightweight tiled roof for conservatories alternatives.
What affects the cost per m² of a conservatory roof replacement?
The conservatory roof cost per m2 depends on several factors: your choice of roofing material (tiled warm roof system costs more than polycarbonate), the complexity of your roof shape (Victorian and hipped designs cost more than simple lean-tos), your insulation specification (premium insulation with better U-value ratings increases costs), and your location (London and South East have higher labour costs). Additional features like internal plastering, new lighting, and structural work also increase the per-m² cost.
Is a solid tiled warm roof worth it for energy savings?
Yes, upgrading to an energy efficient conservatory roof typically offers excellent long-term value. A tiled warm roof system or insulated solid panel roof can save £100-£200+ annually on heating costs compared to old glass or polycarbonate roofs. The payback period is usually 10-25 years depending on your usage and energy prices. Beyond financial savings, a warm roof conservatory becomes a comfortable, usable living space year-round rather than being too cold in winter or too hot in summer.
How long does a typical cosy roof installation take?
The cosy roof installation time varies based on the size and complexity of your project. For a small to medium conservatory (up to 20m²), expect 2-3 days. Medium-sized projects (20-40m²) typically take 3-5 days, while larger or more complex installations (40-70m²) may require 5-7 days. Very large or complicated projects over 70m² can take 7-10 days. Weather conditions and any unexpected structural issues can extend these timeframes.
Do I need planning permission or building control for a cosy roof upgrade?
Most conservatory roof conversion cost projects fall under Permitted Development in the UK, meaning you typically don't need planning permission. However, you will need Building Regulations approval to ensure the new roof meets thermal efficiency (U-value and insulation upgrade standards), structural safety, and fire safety requirements. Reputable installers usually handle Building Control applications as part of their service. Check with your local authority if your property is listed, in a conservation area, or if you're unsure about restrictions.
Why do quotes from installers sometimes differ from this calculator?
This cosy roof cost calculator provides general estimates based on typical UK market rates. Individual installer quotes may differ because they consider factors we can't measure remotely: your exact site access (scaffolding requirements), the condition of your existing conservatory structure, specific product brands and quality levels, current workload and availability, regional competition, and whether any additional work is needed (such as repairs to walls, frames, or foundations). Some installers may also offer package deals or seasonal discounts. That's why we recommend comparing quotes from multiple installers.