External Wall Insulation, also known as Solid Wall Insulation, is fixed to the outside walls of your home and covered in a special type of render.

Houses built before the 1920’s usually have solid walls instead of cavity walls and therefore hugely benefit from installing External Wall Insulation.

Check if you are eligible for funding

The Facts & Stats

By installing solid wall insulation, you can save up to
per year on your fuel bills

Increase the value of your home by up to

Reduces your carbon footprint

Make your home more airtight, reducing drafts and heat loss

Requires very little ongoing maintenance

Provides a 25 year energy performance warranty, giving you complete peace of mind

The insulation installed at our home has made an enormous difference. Last winter our fuel bills were halved compared to the year before. We also had an incurable damp problem in one of the bedrooms but now it’s gone! I would highly recommend solid wall insulation to anyone who owns a cold, drafty or damp home

Mrs Kaur, Bloxwich, Walsall

What to expect

Endless colour options



How do I know if I have a solid wall property?

The property was built prior to 1920.


The walls are less than 260mm thick.


The brickwork resembles the photo displayed.

How much does solid wall insulation cost?

Check your eligibility here


The cost of installing solid wall insulation depends entirely on your property archetype and size, and is usually quoted per square metre.

We are able to offer up to 100% funding for solid wall insulation installation, subject to eligibility criteria being met.

Solid Wall Insulation FAQ’s

Will it affect the appearance of my home?

By externally insulating your property it will improve the overall look of your home and add value to your property value. You can select from a variety of different finishes and colour options, to choose a finish that suits your taste and your home.

How long does it take to insulate my home?

The installation process can be weather-dependent and requires dry weather for the latter parts of the installation, however a typical installation takes between 1-2 weeks to complete.

How much mess and disruption can I expect?

Scaffolding will need to be erected around your property to allow our installers full access to apply external wall insulation. The process can be disruptive and materials will need to be delivered to the outside of your home, however our professional installers keep disruption and mess to a minimum and work swiftly and effectively to make the process as easy as possible for every household.

Can Solid Wall Insulation be put on cavity walls?

If your home has cavity walls, then it would not be a requirement to external insulate. Cavity walls need cavity wall insulation, which is a different type of insulation. Cavity walls, as suggested in its name, have space built within the wall where insulation can be injected into. Solid Wall Insulation is required when your home has no cavities and therefore needs insulation on the outside of the property.

How thick is Solid Wall Insulation?

This can vary depending on which system you install, however most insulation is around 100mm thick.

My home suffers from damp, will Solid Wall Insulation help?

Solid Wall insulation can help damp from occurring but may not resolve existing damp problems. Insulating the outside of your home helps raise the temperature of your internal walls and can reduce the risk of condensation forming. We recommend ventilating your property throughout the year and speaking to one of our expert advisors who can assess your property and advise accordingly.

How long does Solid Wall Insulation last?

Solid Wall Insulation can last for many decades, even longer when well maintained. Most installations come with a 25 year guarantee, giving you peace of mind in the system.

Does Solid Wall Insulation require maintenance?

Once the installation is complete your home will look new and fresh and the value of your property should increase due to its kerb appeal and improved energy performance. Solid Wall Insulation requires little maintenance however we do recommend washing down any areas of dirt throughout the year to ensure the render maintains its fresh appearance.

Solid Wall Insulation Grant

What is a free solid wall insulation grant?

ECO grants are funds being provided to help individuals with the lowest incomes insulate their homes, as well as those who live in the least energy-efficient homes or the lower council tax bands.

How do grants for solid wall insulation work?

First, eligibility is determined by a number of factors including household income, EPC rating and whether or not you are receiving any current government benefits. Residential Energy Services then work to determine suitable energy efficiency measures for your home. We also work with a trusted network of partners to help ensure those measures are delivered correctly.

How do I apply for a solid wall insulation grant?

Contacting Residential Energy Services is the quickest and most straightforward way to find out if you qualify, compile your eligibility criteria and approach energy providers to obtain solid wall insulation grant support.

How much can I get from an ECO grant?

Under the Great British Insulation Scheme and ECO4 scheme, free home energy efficiency upgrades are available to eligible homes. The awarding of grant funding is entirely dependent on determining the right measure for your home at this time.

How much money is available for in ECO grants?

The Great British Insulation Scheme is expected to include £1 billion in funding. The ECO4 scheme, which is expected to run until March 2026, expects to deliver up to £4 billion in energy efficiency and heating measures.

I already receive government funding; can I apply for an ECO grant?

If you already receive government assisted benefits, you may not be eligible for the ECO4 scheme. However, you may still be eligible for free insulation measures under the Great British insulation scheme.

Who pays for solid wall insulation improvements to my home?

The Energy Company Obligation is a government scheme deployed by energy suppliers who fund energy efficiency measures for your home, delivered by ECO approved installers.

Who decides what measures I’m suitable for?

It is ultimately the decision of the energy supplier to determine which measures are best; however, a home energy assessment with Residential Energy Services can make this process more accurate, relevant and efficient, to make sure you’re getting exactly the support you need.

Solid Wall Insulation Grant Eligibility

Am I eligible for a solid wall insulation grant through ECO funding?

If you are a homeowner or private renter with an EPC rating of D or below, and you receive any of the ECO4 qualifying benefits, you should be eligible for support either through ECO4 or the Great British Insulation Scheme.

Is the ECO scheme means tested?

If you claim means tested government benefits it is likely that the ECO scheme is for you. Check your eligibility before consulting with your energy supplier.

What benefits do I need to receive to get ECO funding?

If you receive at least one of the following government benefits the energy company obligation should be able to support you with new energy efficiency measures:

  • Child Benefit
  • Pension Guarantee Credit
  • Income-related Employment and Support Allowance (ESA)
  • Income-based Jobseeker’s Allowance (JSA)
  • Income Support
  • Tax Credits (Child Tax Credits and Working Tax Credits)
  • Universal Credit
  • Housing benefit
  • Pension credit saving credit

I already receive ECO funding, can I apply for a new grant?

If you have received support through previous schemes run by the government and your household still qualifies, you may still be eligible under the Great British Insulation Scheme.

What EPC rating do I need to be eligible for ECO funding?

To qualify for ECO4 funding, your property must have an EPC rating of D, E, F or G. To qualify for funding under the Great British Insulation Scheme, your EPC rating must be D or below and your Council Tax Band A-D.

What tax bands are supported by the ECO scheme?

Low income households within the council tax bands A to D are eligible to gain access to support under the Great British Insulation Scheme.

I live in a rural area, am I eligible for ECO funding?

If you do not reside in a tax band area of A-D but you still have an EPC rating of D or below, you may still be eligible for ECO support. Check your eligibility with Residential Energy Services.

Is my home suitable for Solid Wall Insulation?