How much does roof insulation cost?

Roof insulation quick cost guide

This guide breaks down how much it costs to insulate a roof. By material types like fibreglass, mineral wool, or spray foam, plus installation methods for lofts, pitched roofs, or flats. It covers average UK prices, grants and tips to cut expenses.

In this cost guide we will talk about:

1. Average cost of roof insulation
2. Hiring a professional roof insulator cost
3. Different types of roof insulation and costs
4. Ways to save money on your roof insulation costs
5. Find roof insulation professionals near you on MyBuilder
6. FAQ: Common questions about the cost of roof insulation

Average cost of roof insulation

Planning roof insulation? Get the lowdown on typical costs first to budget smart for better home comfort.

On average, the cost of roof insulation ranges between £740 and £1,700, including both materials and labour.

Here’s a comparison of costs per square metre by insulation type:

Insulation Type	Cost per m²
Fibreglass	£4 – £10
Mineral Wool	£5 – £18.20
Cellulose	£11
Sheeps Wool	£19.75
PIR Board	£12.00
XPS Board	£21.00
Spray Foam (Open Cell)	£55
Spray Foam (Closed Cell)	£70

Hiring a professional roof insulator cost

Hiring a professional tradesperson ensures proper fitting, reducing air leaks and the risk of damp or mould.

Labour typically costs between £150 and £250 per day and installation usually takes 1 - 2 days depending on the project's scale.

Take a look at the insulation process and the different tasks involved:

Task	Cost
Preparation Work	£50 – £150
Insulation Fitting	£200 – £350
Finishing Touches	£50 – £100

Find insulation companies near you on MyBuilder. It’s quick and easy to post your job, and insulation professionals near you will be ready to help.

Different types of roof insulation and costs

Pick insulation that balances upfront costs with energy savings. Match the material to your roof type and goals for the best results.

Fibreglass insulation:

Fibreglass is a widely used, affordable insulation material, typically sold in rolls or batts. Costing between £4 and £10 per square metre, it's both moisture-resistant and fire-safe. Ideal for standard roofs, fibreglass is often the choice for budget-conscious homeowners.

For loft conversions or top-floor areas, you might also explore our advice on choosing loft insulation installers to help you find suitable professionals for quality installation.

Spray foam insulation:

Spray foam insulation excels in sealing air gaps and delivering strong thermal performance. It ranges from £55 to £70 per square metre. While it’s more expensive, the airtight seal can provide excellent long-term savings.

Rigid foam board insulation

Rigid foam board insulation provides a high insulating value and excellent moisture resistance. Priced between £12.50 and £21.50 per square metre depending on the material, it’s best suited for roofs exposed to humidity or where structural strength is more of a concern.

The type of insulation you choose not only depends on costs, but the weather conditions and temperature where you are living. Talk to a professional local to you on MyBuilder.

Talk to a professional

Ways to save money on your roof insulation costs

Roof insulation pays back with lower energy bills. But the initial cost can seem like a large investment.

Here are some more easy ways to cut costs:

Get a grant:

Check the Great British Insulation Scheme (GBIS) or ECO4. They fund or cover insulation for many UK homes, especially low-income ones.

Shop smart:

Compare quotes from 3 local installers. Pick budget materials like fibreglass over spray foam.

​ Time it right:

Book installs in winter when demand drops and firms offer 10 - 20% discounts. Pair with off-peak energy tariffs for quicker payback.

Find roof insulation professionals near you on MyBuilder

Get the right value for your roof insulation project by connecting with verified tradespeople on MyBuilder. It only takes a few minutes to post your job today, then request quotes from multiple different insulation companies in your area.

Then, you can compare quotes and make a confident decision. Take the first step towards energy-efficient insulation today.

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FAQ: Common questions about roof insulation costs

Is there a noticeable difference in temperature regulation with proper roof insulation?

Yes, proper roof insulation greatly improves temperature regulation by reducing heat loss in winter and heat gain in summer. It helps maintain more stable indoor temperatures, minimises draughts, and enhances overall comfort. This often leads to lower energy bills and a reduced environmental impact.

What are the common challenges encountered during the roof insulation process?

Typical challenges include restricted access in tight or awkward spaces, moisture and ventilation problems that may lead to mould, and the removal of old insulation materials. Choosing the right insulation for your roof type and ensuring correct installation can help avoid these issues.

What maintenance considerations should I keep in mind to extend the life of my roof insulation?

Maintenance should include checking for leaks or damp, ensuring adequate ventilation, and confirming the insulation remains evenly spread and undisturbed.

Regular professional inspections can catch problems early and help maintain the insulation’s effectiveness over time.

How long does roof insulation last?

Quality roof insulation typically lasts 25-50 years, depending on material and conditions. Fibreglass and mineral wool endure 40+ years with minimal degradation, while spray foam can reach 50 years if installed correctly.