Government Grants for Thermal Insulation & Heating Infrastructure

Government Grants for Thermal Insulation & Heating Infrastructure

Some Facts: Cavity Wall Insulation etc.

The Warm Front Scheme:

As a useful starting point refer to which provides an at-a glance summary of eligibility for all insulation and heat-related grant aid.

Energy Company Grants:

Grants are funded by the energy companies via EnergyLink (part of the Government Carbon Emissions Reduction Target – CERT), and as with those of other previous initiatives, are offered subject to the work being carried out by an ‘approved installer’ – meaning a contractor approved as competent both by the British Board of Agrément and by the manufacturer of the product being used.

Accreditation of Contractors:

As part of the accreditation process – for example, to qualify for installing cavity-wall insulation, an approved installer has to satisfy an initial site installation check, and thereafter will be subject to the BBA Assessment and Surveillance Scheme. The product manufacturer will also make spot checks to ensure that the installation complies with the conditions set out in the BBA certificate.

Proof of Competence:

At least one member of the team of operatives must carry an identification card issued
by the manufacturer.

Building Regulations or Exemptions:

Like the fitting of replacement windows, insulation of a cavity wall requires consent under the building regulations, and involves prior application unless the contractor holds an exemption certificate.

BBA Certificate numbering:

BBA Product Certificates for cavity insulation require not only that the BBA identification mark is shown on quotations, tenders and invoices, but also the certificate number which identifies the product irrefutably.

Initial Survey:

The whole process begins with a pre-works survey by the installation company, and on completion the work will be guaranteed for a period of 25 years by CIGA, the Cavity Wall Guarantee Agency. 25-year Guarantee

The following definitions might be of assistance:

25-year Guarantee:

CIGA: (Cavity Wall Guarantee Agency): Established in consultation with the UK Energy Environment and Waste Directorate (part of DETR). An independent agency with is own secretariat that provides a 25-year guarantee for cavity-wall insulation. Governed by a council of system-designers who also supply the insulation material) and registered installers with support from trade associations and government bodies. The guarantee covers defects in materials and workmanship. Guarantees are transferable when a dwelling changes hands.

To find out more, click on

Energy Savings Trust:

An independent, non-profit making organisation acting as a bridge between government, consumers, trade, businesses, local authorities and the energy market. Mission: to provide impartial information and advice specifically designed to help consumers take action to save energy.

To find out more click on

British Board of Agrément – (BBA) is the UK’s major authority offering approval of construction products, systems and installers.
Since 1966 Agrément Certificates have been providing invaluable information on the performance of new construction products and materials. For only a little less time, the
BBA has been running its injected cavity wall insulation approved installer scheme, and since 2002 has provided the inspections that have underpinned the FENSA Competent
Persons Scheme for replacement windows and doors in England and Wales.

The BBA has a reputation for integrity and its absolute independence and impartialityrecognised throughout the construction industry in the UK and beyond. The reputation
of the BBA is also underlined by its UKAS accreditations. The BBA is also the UK representative of EOTA, the body that co-ordinates the issue of European Technical

Approvals across the EU. In this respect, the organisation is responsible for issuing European Technical Approvals (ETAs), and will also offer testing and certification services in support of CE markings against harmonised European standards.

Maintenance of core values is addressed by a Governing Board of senior figures drawn from the UK construction industry and implemented by the BBA Management Team. Input to technical work is also overseen by a Technical Advisory Committee, including representatives of all key industry sectors. See also

Retrospective Fill.

Types of Cavity Insulation

Survey Key points: Older cavity construction: Retrospective insulation:

Essentially, three types of retrospective cavity fill are likely to be encountered: Looseblown mineral wool (glass or rock); Expanded polystyrene bead (EPS); and Ureaformaldehyde
foam (UF). Each has its place, but all are approximately equivalent in insulation properties. UF tends to be less favoured than the other two products and is
unsuitable for use where the wall is moderately or severely exposed to incident weather, but was much used in the 1960s/70s, until perceptions that formaldehyde gas was one
cause of a ‘sick-building’ syndrome caused it to be regarded with suspicion. An adverse effect has not been convincingly proved.

A building survey should be able to establish whether retrospective cavity fill has been installed, and the type of material. This information should also be indicated in the
Energy Performance Certificate (EPC), but take note: The Independent Surveyors Association knows of several instances where the Energy Assessor has failed to make the correct interpretation.

Air-bricks Sub-floor ventilation:

Surveyors need to be aware of the following:

1. Work of installing CWI is a rapid process (2 hours for the average semidetached house), and we are aware of various examples where under-floor ventilation in some older housing has been compromised: firstly by neglecting to confirm sleeving of the cavity, or secondly by failure to remove the outer ‘air-brick, and provide protection by fitting a ‘cavity-brush’ or other type of approved protection to prevent the air channel becoming blocked by the insulation. Use of a torch will often assist in determining whether an air channel is sleeved or not. One of our members recommends checking the opening into an under-floor void by using a length of stiff wire (he uses an opened-up clothes hanger for this purpose).

If unimpeded and protected openings cannot be determined, this fact should be stated in the report, with a recommendation for an extended survey to investigate further, by opening-up. The risks associated with insufficient airing of ground-level voids below suspended-timber floors should be emphasised.

Pre-works Survey Report:

2. The pre-works inspection carried out by the installation company should be a detailed assessment of all aspects of the wall in accordance with BS 8208:Part1: 1985, and should result in a survey report and comprehensive data record which will be retained by the BBA certificate-holder. However examples of defects (generally penetrating dampness) continue to occur where walls unsuitable for cavity-insulation have, nevertheless, been treated:


One case (unreported) concerns a tenant, where the Local Authority landlord upgraded its social-housing stock on an exposed coastal site, by inappropriate installation of loose-blown rock-wool into the cavity walls. Within two years, water-bridging had occurred, causing dampness internally, and development of
‘black-mould’ (Stachybotrys chartarum or similar). The tenant had a history of chronic asthma, which became dramatically worsened by the environmental
conditions within the dwelling, resulting in a successful claim for compensation against the landlord. As well as compensation in recognition of the ill-health suffered, the Local-Authority landlord had to carry out remedial rectification which included opening up the walls and removing the saturated
cavity-fill, and then providing insulation externally, behind a rendered, weatherproof finish.

The importance of the pre-works survey cannot be underestimated, and the purchaser of a house with retrospectively-fitted CWI should always be advised to obtain a copy of the report as well as the guarantee certificate for safekeeping with the title documents.

Importance of comprehensive inspection for penetrating dampness:

3. When carrying out a building survey of a dwelling which has been treated with CWI, it is advisable to ensure careful inspection of the internal wall surfaces for dampness at all levels, and not only on the ground floor. Investigate for circular patches which might indicate bridging of wall ties; dampness on the undersides of, or around, structural openings where cavity-trays may have been compromised, as well as at floor level. Externally, check with particular care, render and other finishes for evidence of structural fractures (defective wallties, and other structural faults), and the level of damp-proof courses. If in doubt, warn the client of the consequences of defects arising from inappropriate CWI.

Identify the Material:

4. Wherever possible, try and establish the nature of the material used for cavity insulation. Inspection at roof-void level, or from an electricity-meter wall-box, will often leave clues where the material has escaped through openings in the structure.

Notice to Conveyancer:

5. Recommend the client to instruct the conveyancer that cavity-wall insulation has been installed, that it is a notifiable event under the Building Regulations, unless the work has been carried out by a contractor holding an ‘exemption certificate’. If the work is of recent origin, recommend that a copy of the preworks survey, and CIGA guarantee are obtained (from CIGA), if necessary; and that any benefit under guarantee is transferred on change of ownership. A small charge is made for changing the name on the certificate (£5.00).

Advise of Risks:

6. Advise the client of the risks from penetrating dampness arising from cavity fill, the extent of your investigation for current evidence of dampness within the dwelling, and the importance of the CIGA guarantee, if available.

7. Advise clients about the possibility of grant aid for dwellings which need improvement: is a good starting point.

“© R.H. Hulls: February 2010”


Having served 16 years in the army Colin re-educated during the early 1990’s including two years at the Camborne School of Mines reading Mineral Surveying and Resource Management achieving a first class Diploma (Dip CSM). This allowed direct entry to the second year at The University of the West of England, Bristol reading Valuation and Estate Management. Training and experience was gained with Exeter City Council Estates Department and Sheperds Chartered Surveyors qualifying as a Member of the Royal Institution of Chartered Surveyors in June 2003. Colin set-up the company in May 2009 and covers the complete range of services.

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