Green Home Grant Examples of Cost

A new Government scheme launching in September will help homeowners in England improve the energy efficiency of their properties via a £5,000 grant. The grant can be used for a whole range of energy saving improvements including double-glazing, loft insulation, solid wall insulation and floor insulation.

Improving the thermal efficiency of the envelope of the property (floor, walls and roof) in our opinion is the best way to help lower homeowner’s energy bills and also reach the Governments ambitious energy targets.

In total, the Chancellor Rishi Sunak has put aside £2 billion for the Green Homes Grant scheme, meaning a minimum of 400,000 homeowners in England should benefit. It is expected that everyone will be able to apply for this grant – it will not be means tested. It is worth noting that much like the Green Deal Home Improvement fund grant that was launched several years ago, the Green Homes Grant will require a contribution from the homeowner (in most cases) – the current thinking is that approximately two-thirds of the cost of the energy efficiency works will be covered by the grant with the homeowner expected to pick up the other third.

Green Home Grant Example 1: Cavity Wall Insulation

Cavity wall insulation costs approximately £11 per m2, so for a mid-terrace house that is 5 metres across there is approximately 25m2 of wall on the front and the back – so in total 50m2.

  • Total Wall Area (50m2) x 11 per m2 = £550 total cost.
  • 2 / 3rd Government contribution – £366.66
  • 1 / 3rd Household contribution – £183.33

Green Home Grant Example 2: Double Glazing 

A new double-glazing window costs approximately £600 so in a detached house with 13 windows, the total cost of getting the glazing replaced would be £7,800.

  • 2 / 3rd Government contribution – £5,200
  • 1 / 3rd Household contribution – £2,600

However, the maximum homeowner grant is £5000, so the homeowner would actually have to pay £2,800.

Green Home Grant Example 3: Solid Wall insulation

The costings on a typical semi detached house. The cost of installing 90mm of EPS is approximately £90 per m2, so on a semi detached house could be anywhere from £10,000 to £14,000 depending on the length of the flank wall.

In this case you would get the full £5,000 grant and need to top up the remaining £5,000 – £9,000 for the rest of the works. This being the case, it maybe an option just to do a particular problem wall e.g. a long cold flank wall for example.

What about those who can’t afford to make the ‘Customer Contribution’?

The scheme is open to all, but it is thought that Low Income households will be able to claim £10,000 under the scheme and those households will not be required to make any contribution. However there unfortunately will no doubt be some properties who ‘fall through the gap’ and will be unable to afford the contrition if they are not considered to live in low income households.

What energy saving improvements does the Green Homes Grant cover?

As mentioned previously, the Government want to make insulating the envelope of the home a priority, so we expect cavity wall insulation, external wall insulation, loft insulation double glazing and floor insulation to be the priority.

We would be surprised if the grant covered ‘topping up’ of existing insulation measures – so for example if the householder already has 170mm of loft insulation, it seems unlikely the Government will provide a grant for this to be topped up to 300mm as the incremental energy saving gains will be minimal.

Having said that, the Government is not just trying to improve the energy efficiency of England’s housing stock, it is also trying to promote job growth in the Green Economy following the COVID-19 pandemic, so potentially some of the marginal upgrades may actually make the cut, for example just replacing 1 or 2 windows in the home.

While the Government are keen to improve the efficiency of the envelope of homes, the way the announcement was worded suggests that improvements to heating systems (e.g. boilers) will not be included. In our opinion, this makes sense as replacing a boiler typically only produces minimal energy savings especially if the existing boiler has been installed within the last 15 years.

How do you get the Green Homes Grant?

Unfortunately, the Government are yet to reveal exactly how the scheme will run, however we think it is a fair bet they will use the previous Green Deal Home Improvement fund grant as a blueprint. For that scheme, the homeowner had to apply for the voucher via a Government portal and at the same time had to select their approved installer and we think this will be the same process this time round.

Leave a comment