The Green Deal Cardiff
  Cardiff Buildings

Making your Home cheaper to run.

Telephone: 0800 8 10 10 60







Free Cavity Wall Insulation Grants in Cardiff, Bridgend, Caerphilly and throughout South Wales.


Tap and call 07960 799 681 (from Smartphones)


Is Cavity Wall Insulation really Free in Cardiff?

Under the Cavity Wall Insulation Grant scheme, Cavity Wall Insulation is Free in 99% of the cases for those that qualify for the Grant.

The Enhanced Cavity Wall Insulation Grant qualification, has been broadened. Many people who did not qualify for this Grant in the past, will now qualify.

There is also a new Flexible Cavity Wall Insulation Grant scheme available which is based on a number of factors, but it is not based on benefits.

To find out more go here.

We would of course be pleased to give a quote to those that do not qualify for a grant on either scheme.

Click here to complete a short Online Enquiry Form

 What Free Cavity Wall Insulation do we use?

We always install “SuperBead” Polystyrene Beads and not “RockWool” (fibre). Polystyrene Bead is a superior material for insulating Cavity Walls, but it is more expensive. “SuperBead” cavity wall insulation has been certified for the following.

Thermal properties — “SuperBead” cavity wall insulation has a declared thermal conductivity of 0.035.

Water resistance — “SuperBead” cavity wall insulation will resist the transfer of water across the cavity.

Condensation — “SuperBead” cavity wall insulation will contribute to limiting the risk of condensation.

Behaviour in relation to fire —  “SuperBead” cavity wall insulation does not prejudice the fire resistance properties of the wall.

Durability — “SuperBead” cavity wall insulation is durable, rot-proof and water resistant. It is sufficiently stable to remain effective as an insulation for the life of the building

“SuperBead” cavity wall insulation is up to 20% more efficient than fibre insulation. The insulation is blown into the cavity with an adhesive which “goes off” in about 20 minutes. There are about 30% fewer holes than using fibre, and the holes are smaller. This leaves a “solid” blanket of polystyrene wrapped around your home, reducing heat loss through the walls by about 70%.

The beads have been thoroughly tested and will not deteriorate over time. They are fully fire resistant. They have approval for use in even the most extreme of conditions.

As a part of the initial survey we also carry out a CAS + ISA (Cavity Assessment and Surveillance Scheme) survey. The suitability of your walls to be insulated will be assessed. This is part of the greatly improved quality control measures found in the new free Cavity Wall Insulation Grant scheme.


How is Cavity Wall Insulation Funded?

The Government have (for at least another couple of years) massive European targets to reduce Carbon Emissions. The Government, as Governments do, passed the buck. They gave a Legal Obligation to the Gas and Electricity companies to reduce Carbon Emissions. This is know as the Energy Company's Obligation, ECO for short.

From April 2017, the system has been simplified and an energy assessment is no longer required. Instead the Government have "deemed" an amount of Carbon Emission savings for each type of property - terraced, semi-detached, detached, 2 bed, 3 bed, 4 bed etc. We then sell these Carbon Emission savings to one of the Gas and Electricity companies - and that is how it is funded. We all pay an amount on our fuel bills towards this fund, so yes, we pay for it, as usual.


Are my Cavity Walls suitable for insulating?

If your home was built after 1925, the chances are that its external walls are made of two skins of brick with a gap or cavity between them, held together with wall ties. Cavity Wall Insulation fills that gap, keeping the warmth in - thus saving energy. It can also help reduce condensation inside the house if this is a problem on your external walls.

Your home will usually be suitable for cavity wall insulation if:

  • the external walls are unfilled cavity walls
  • your cavity is at least 50mm wide
  • the masonry or brickwork of your property is in reasonably good condition
  • properties built after 1982 now qualify for a grant.

But it is not as simple as that.

As a part of the initial survey we also carry out a Cavity Assessment Survey (CAS). This is a PAS2030 and OFGEM compliant survey, with an Independent Surveillance of the Assessment (ISA) by CIGA (the underwriter of the 25 year guarantee).

The suitability of the walls to be insulated will be assessed by way of an extensive survey of the property.

This survey includes drilling a small test hole into the wall of each elevation. A borescope will be inserted into each hole and the cavity will be examined. Photographs of the cavity will be taken, along with measurements of the depth of the cavity.

All walls are carefully examined and any remedial work noted , such as cracks, unfilled holes, etc. This remedial work has to be completed before the walls can be insulated

Gutters and down-pipes are examined for any leaks, blocks, or spillage and proper drainage.

The survey will take about 2 hours, and is free of charge.

The report and photographs are then uploaded to the CIGA platform for auditing.

This is a part of the greatly improved quality control measures found within the new free Cavity Wall Insulation in Cardiff Grant scheme.


What if there is damp? 

If you have any damp patches on the inside of your external walls then they should not be insulated until the cause of the damp has been resolved. In fact, if there is damp, the property will fail the CAS + ISA, and we will not install cavity wall insulation. To get a Grant there must be a 25 year guarantee issued. To get a 25 year guarantee issued the property must pass a CAS + ISA survey. So, if there is damp there is no Grant - simples.

If it is "Black Mould / Spots" then this is probably Condensation and not Damp. 90% of the time Condensation is a lifestyle issue rather than a structural issue. However, Cavity Wall Insulation can help reduce/eradicate Condensation.


How is Cavity Wall insulation installed? 

Filling cavity walls is not a job you can do yourself. We do the job in around 2-3 hours for an average house with easily accessible walls. It is simple, quick - and with no mess. 

Cavity Wall Insulation can reduce the amount of heat escaping from your home by up to 35% (70% of the heat lost through the walls) and can reduce CO2 emissions by up to 3 tonnes per year. 

  • Most homes built of brick between 1925 and 2017
  • Blown into the gap between two skins of brick.
  • Installed from the ground floor to the roof. 

Free Cavity Wall Insulation being installed

Our Installers are among the best in the business, and they will make good the holes with closely-matching filler, so that you have a first-class result with the minimum of fuss and disruption. Most of our customers are amazed at how quickly and neatly this operation can be carried out and our work is guaranteed for 25 years by CIGA the Government-backed Cavity Insulation Guarantee Agency – offering you complete peace of mind.

Peace of Mind

The Cavity Insulation Guarantee Agency provides independent 25 year guarantees for Cavity Wall Insulation fitted by registered installers in the UK and Channel Islands. 

The Government regards cavity wall insulation as "the most effective energy savings measure that most people can carry out on their homes" and a major contributor to reducing carbon emissions.   

The Cavity Insulation Guarantee Agency was established in consultation with the Government's Energy, Environment and Waste Directorate (a division of DETR) to provide householders with an independent, uniform and dependable guarantee covering defects in materials and workmanship.

Independent research carried out for the Department of the Environment, Transport and the Regions (DETR) has confirmed that cavity wall insulation is a very reliable process.

Problems are therefore extremely rare, but if they do occur, CIGA has the expertise to ensure that they are swiftly rectified. The new CAS + ISA survey will also reduce the potential for future problems, by only insulating walls that are suitable.

CIGA also operates and administers the Cavity Wall Insulation Self Certification scheme (CWISC) in association with the British Board of Agrément. The scheme provides homeowners with the comfort of knowing that work by registered contractors complies with the requirements of the Building regulations.

Book a Survey

By email to

To call from a Smartphone just tap this number      0800 8 10 10 60       or this one    07960 799681

otherwise call us on one of the numbers below

Freephone: 0800 8 10 10 60  Mobile: 07960 79 96 81 Landline: 01443 836455

or you can complete the online enquiry form below.









2013 COPYRIGHT OF THE GREEN DEAL CARDIFF.CO.UK  Group websites   The Green Deal      Green Deal   The Green Deal