While the Green Homes Grant Scheme is no longer available, rising energy costs remain a concern for many homeowners.

Upgrading insulation – particularly in the loft – is a cost effective and quick way to improve the energy efficiency of a home… and reduce energy costs.


Quick Links:

1. Signs your home is energy inefficient

2. Average costs of a UK home energy bill

3. How to save heat energy in your home

4. Insulation and the EPC certificate

5. Can insulation improve the value of your property?

6. Why choose ROCKWOOL insulation?

7. How we can help

Five signs your home is energy inefficient

#1: You need the heating on all day and night, or for extended periods

#2: The floors and/or walls are cold to the touch

#3: You’ve tried other ways of warming up the house, like heavy curtains, draught excluders, and chimney balloons, but they’ve been ineffective

#4: Your energy bills are still very expensive, despite switching energy tariff

#5: There’s damp and condensation inside your home

The cost of an average UK energy bill

If you don’t have the recommended amount of insulation in your home, insulating it will make your energy bills cheaper.

According to the renewable energy provider, OVO Energy, the average yearly combined energy bill in 2019 was £1,289. It breaks down the average combined energy bill cost per size of the household to:

  • £784 for a small house or flat
  • £1,153 for a medium house
  • £1,604 for a large house

Meanwhile, the Energy Savings Trust says you will save around £150 for insulating the loft alone. It’s closer to £225 a year if you install solid wall insulation.

How to save heat energy in your home

Insulation slows down heat passing through surfaces, like the walls, loft, and roof. It’s resistant to heat flow.

If you insulate your home with stone wool, it’s one of the safest and energy-efficient types of insulation. That means:


  • Hot air won’t easily escape during the winter. The house stays warm, so you don’t need to have the heating on for very long
  • You’re less likely to need fans or air conditioning in the summer because external heat wont warm up your house, helping to keep you cooler.


It’s a material that helps you to manage the temperature of your home all year round, without even touching the thermostat.

Three benefits of insulating your home:

  1. It’s a comfortable temperature all year round
  2. Energy-saving, safe insulation adds value to the property when you come to sell it
  3. You’ll save money on your energy bills

Insulation and the EPC certificate

To get a reliable assessment of how energy-efficient your house is, look at its energy performance certificate (EPC).

The EPC gives you an estimated energy cost, plus an official energy efficiency rating in bands A-G. It’s an indicator of your property’s energy efficiency.

If you don’t have a copy of your EPC, or it’s expired, use the Simple Energy Advice postcode finder to find the most recent certificate. The service is free to use and available to everyone.

If your property is well insulated, your EPC certificate will have an energy-efficient rating and it’s not likely you’ll need to use the grant to insulate your home.

However, a low rating could suggest your property is poorly insulated throughout, or in critical heat-loss areas, like the roof. 

Can insulation improve the value of your property?

The value of energy efficiency was scrutinised in this report by Money Super Market which found a ‘strong correlation’ between a high EPC band rating and higher house price. A property with a band A/B EPC rating increased its value by 14%.

Its findings were mirrored in government research too.

In 2013, the government estimated that if you increased your EPC band from G to E, or from band D to B, you could add £16,000 to the asking price of your property. The average price increase in England was 14%, if the band moved from G to A/B.

A poor rating tells prospective buyers that the utility bills will be very expensive. It suggests there could be significant, costly issues to work on.

If you’re planning to move house within the next year, it’s worth putting the green tech and materials in your home under the microscope.

Thermal performance
The optimal temperature, whatever the weather outside

ROCKWOOL is capable of keeping homes warmer in the winter and cooler in the summer, maintaining a comfortable indoor environment.

Thermal performance

Sound reduction
ROCKWOOL products turn down the volume

Stone wool’s dense, non-linear structure makes it an excellent acoustic material, cutting down on nuisance noise.

Sound reduction

Fire resilience
Homes with peace of mind built in

Our stone wool insulation is non-combustible and capable of withstanding temperatures in excess of 1000 C, providing an extra element of safety.

Fire resilience

Protects the long-term health of buildings and occupants

Stone wool insulation will not contribute to damp or mould, reducing the likelihood of remedial work in the future.