Green Deal FAQs

How can I tell whether an assessment has been completed correctly and that it´s safe to insulate my home?
An experienced assessor can assimilate a lot of information based on knowledge of the locality, the construction practice at the time of build and inspecting similar properties in the locality. However, every building is different and the level of investigation required will vary, depending on many factors. It is also important that you answer any questions that the assessor asks about the property or its history as accurately and fully as you can.
What does the Assessment Cover?
The majority of houses are suitable for CWI, and the assessment is designed to identify those that are not suitable. This involves a combination of visual checks, questioning and investigation that considers:

  • Form of construction, age of building & structural condition
  • Site conditions and Health & Safety considerations
  • Extent of cavity to be filled and measurement of cavity wall area
  • Outer and inner leaf
  • Services through the cavity
  • Ventilation and flues
  • Means of space and water heating
  • Modification to external walls since original build
  • Extensions and additions.
Will I see the assessment?
It is not usually necessary for a copy of the assessment to be provided and it may not be a written document but may be captured electronically. However, the assessor will usually let you know his finding and, if you are unsure about anything, you can of course ask questions about the process. For example:

  • What is the minimum cavity width (the minimum that can be filled is 50mm)?
  • Are there any areas that will not be insulated?
  • How will the installing team deal with home improvements such as conservatories, car ports and air bricks etc?
have booked to have CWI installed. How do I know that it will be done properly and I won�t have any problems after?
If your property has been deemed suitable then it has been assessed and passed as being suitable for CWI. All work is completed according to strict technical guidance issued by CIGA and all of our installations are covered by the Cavity Insulation Guarantee Agency (CIGA) for 25 years after installation. Therefore in the unlikely event of any problems with the materials or workmanship then you have the comfort of knowing that CIGA is there to investigate and ensure that they are resolved.
How long will the insulation last?
For the lifetime of your property although the warranty is for 25 years
Why should I have Cavity Wall Insulation installed?
CWI is a proven technology giving benefits of a warmer, more comfortable home, significantly reduced heating costs compared to an uninsulated home (annual savings of around £145 and payback in around two/three years) as well as reduced carbon emissions.
I am due to have CWI installed, but am now concerned that it may damage my property, should I cancel?
No- absolutely not, problems post installation are extremely rare. CWI insulation is a proven technology giving benefits of reduced heating costs. (It can save around £145 a year and pay for itself in around two years) and reduces carbon emissions. All systems are subject to technical approvals and in the context of the several hundred thousand installations carried out in the UK each year, very few (only around one in every thousand) have reported any concerns at all to CIGA who provide the independent 25 year guarantee.
Is there much mess created when doing Cavity Wall Insulation?
The drilling process inevitably creates a little dust which will be cleared at the completion of the job. It may be wise to remove vehicles from the drive and objects close to the walls. This will also give the installation technician better access for equipment and tools.