Cavity wall insulation is an efficient way to reduce the amount of energy needed to heat your home and lower your heating bills. If you’re considering this for your home, you’re probably wondering about the costs. These costs will be significantly influenced by the size of your home, the type of insulation material used, and the complexity of the installation process. Please note that the prices may have changed in the meantime and this information is best used as a guide.
What is Cavity Wall Insulation?
Cavity wall insulation involves filling the gap between the two layers of a cavity wall with insulating material, thereby reducing the amount of heat escaping from your home. It’s generally used in houses built after the 1920s, which often have two layers of wall with a gap or ‘cavity’ between them.
The Cost of Cavity Wall Insulation
As of 2023, the cost for installing cavity wall insulation in a typical three-bedroom semi-detached house in the UK might range between £400 and £700. For a detached house, the price could range between £700 and £1,500.
However, the exact cost will depend on several factors:
- Size of Your Home: The larger your home, the more insulation material will be needed, and the more labour will be required, increasing the cost. For instance, a two-bedroom bungalow will likely cost less than a four-bedroom detached house.
- Insulation Material: Different materials can be used for cavity wall insulation, such as mineral wool, polystyrene beads, or polyurethane foam. The choice of material will affect the price, with polyurethane foam usually being more expensive but also more efficient.
- Installation Complexity: If your property has hard-to-reach walls, or if the cavities are narrow or filled with debris, this can complicate the installation process and increase the cost.
- Location: Prices may also vary depending on your location within the UK. Typically, prices in urban areas are lower due to higher competition among providers.
Grants and Funding
Local governments and energy service providers are presenting an array of complimentary benefits ranging from innovative loft and cavity wall insulation to boiler replacements. If your house exhibits a low energy performance evaluation, you might be eligible for the ‘UK Insulation Initiative’ and ‘ECO’ schemes.
What are the offerings?
From 2013, around 2.5 million homes have enjoyed free or subsidised energy efficiency improvements via the Government’s Energy Company Obligation (ECO) scheme. This mandates most energy companies to provide measures assisting low income, fuel-poor, and vulnerable households to efficiently heat their homes.
Moreover, in the previous year, the Government disclosed plans to prolong the scheme in 2023 to assist hundreds of thousands of households that are not currently benefitting, under what’s been dubbed as The UK Insulation Initiative (formerly ECO+ scheme). This scheme was initially set to roll out in April of the current year but has been postponed until the summer.
According to the Government, energy companies can initiate measures under the new scheme ahead of the legislation’s enforcement, but most have revealed that they won’t be ready until the summer. The new scheme will persist until March 2026.
Numerous large energy providers and local governments are donating thousands of pounds towards energy efficiency home improvements. These are accessible to households across England, Scotland, and Wales (with similar schemes available in Northern Ireland). The improvements encompass:
Free insulation: Loft, cavity wall, and other types. Boilers, heating controls, and other efficiency enhancements: There are stricter criteria, but certain households can avail of replacement boilers, free heating controls, and more. The primary ECO scheme is solely available to those who receive specific benefits. However, the new, extended UK Insulation Initiative will permit anyone residing in a home with a low-rated ‘energy performance certificate’ (EPC) AND within certain council tax bands to apply.
Why do energy service providers and local authorities provide insulation and other services?
While multiple insulation types are available under the ECO and UK Insulation Initiative, for most homes, loft or cavity wall insulation will be the primary available measures. The Government affirms that these are “two of the most cost-effective energy efficiency measures to install to reduce energy bills”.
For comprehensive information on how to avail of free insulation, first, confirm your eligibility and then proceed with the application.
What is loft and cavity wall insulation exactly?
Most homes constructed between 1920 and 1990 have a void between internal and external walls. Filling this space with insulation means that cold air is kept out and warm air is retained – though it is not suitable for every home.
Up to 25% of your home’s heat escapes via the roof, but this can be mitigated by placing mineral wool beneath the rafters to insulate the loft.
How much can insulation save me?
The Energy Saving Trust estimates that cavity wall insulation installation (including construction work) can cost up to £1,800, potentially saving between £180 and £690 annually on your energy bills, contingent on your home. Loft insulation could cost up to £890, with potential annual savings between £330 and £590.
Cavity wall insulation is not for everyone When correctly installed in suitable properties, cavity wall insulation can enhance energy efficiency and reduce home heating expenses. However, there have been many instances of damp
While there are costs involved with cavity wall insulation, it’s important to consider the long-term savings. By reducing heat loss from your home, cavity wall insulation can help reduce your energy bills, potentially saving hundreds of pounds per year. Therefore, while the initial cost can be significant, the return on investment over time can be substantial.
Please remember that this information is based on prices and data available as of September 2021, and actual costs may vary. Always obtain quotes from several providers before proceeding, and check if you are eligible for any grants or funding schemes.