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External wall insulation (EWI) offers a way to improve the thermal efficiency of homes built with solid walls. There are many options for external wall insulation, which can improve the energy performance of your home. It can reduce fuel bills by up to 25% and prevent condensation from forming on walls, helping to protect against mould and structural damage.
With the appropriate selection of cladding material, external wall insulation has the potential to significantly improve the appearance of your home. However, it is not appropriate for every house, as set out below. It is therefore important to refer to all the guidance here before installation.
External wall insulation finished with a top coat of render at Greenleaf Road. An increased wall depth meant all rainwater pipes had to be removed and refit
9.2.1
Certain proposals for external wall insulation are classed as permitted development and do not require planning permission. For more information please visit the Planning Portal website and the Technical Guidance on Household Permitted Development Rights. Some areas are covered by Article 4 directions and therefore permitted development may be removed, please check here.
9.2.2
Where planning permission is required for external wall insulation, applications must include existing and proposed detailed drawings at 1:10 scale showing key junctions. Drawings must clearly show the proposed material type, finish, and the junctions at openings and rooflines.
9.2.3
In application drawings, attention must be paid to connections with neighbouring buildings, and detailing around windows and other features.
9.2.4
External wall insulation is generally not acceptable for listed buildings. It may be supported in conservation areas in exceptional circumstances, and proposals are more likely to be supported on rear elevations than front elevations, and other elevations visible from public vantage points.
9.2.5
For buildings outside of conservation areas, proposals for external wall insulation will be assessed by balancing the positive environmental impact against the potential negative impacts to the character and appearance of the host building and local area.
9.2.6
For buildings outside of conservation areas, proposals for external wall insulation on elevations visible from the street will be supported, provided they are designed with regards to the character of the existing streetscape. Proposals should:
be of a complementary tone and quality to the wider streetscape.
specify materials that are robust and are detailed in a way that ensures longevity.
specify materials that are sustainable.
specify materials that are of high quality. Though brick slips can be acceptable if of high quality, adhesive brick slips are not considered acceptable.
not be incongruous, in relation to materiality, scale and quality.
respect any decorative detailing which forms part of the character of the building.
9.2.7
Pre-application submission is encouraged for all applications for external wall insulation, and especially for proposals that deviate from the criteria above.
9.2.8
The proposed facing materials for external wall insulation proposals should generally either:
match the quality and appearance of the existing facing material, or:
be complementary to and of a higher quality than the existing facing material.
9.2.9
For buildings already finished in render, external wall insulation is more likely to be supported. The external wall insulation and render should be detailed and finished to a high standard.
9.2.10
A suitably qualified professional should be engaged to ensure external wall insulation is appropriately designed for the specific building and correctly installed.
9.2.11
Insulating plaster can also sprayed onto the inside of external walls. This gives an appearance that visually very similar to plastered walls, but with the benefit of additional insulating properties.
9.2.12
For guidance on where external wall insulation is likely to be supported, residents should refer to the table below.
9.2.13
For further guidance on fitting external wall insulation in conservation areas and historic buildings, residents should refer to these guides on Retrofitting Heritage Homes.
External wall insulation installed to the rear of a house in Brixton. Careful detailing around windows ensures the insulation does not have a detrimental impact on the host dwelling, or neighbouring properties
External wall insulation and heritage
Likelihood of approval
Details and requirements
Building that is not listed, outside conservation area
Generally supported, provided it has been designed with regards to the character of the existing streetscape.
Houses
Planning permission is required, if permitted development criteria are not met.
Flats
Planning permission is always required.
Building that is not listed, in conservation area
Generally not supported, except from in some circumstances.
There may be scope for external wall insulation on front elevations where buildings currently make a neutral or negative contribution to the conservation area.
More likely to be supported on side or rear elevations, with due regard to historic character and appearance.
Planning permission is required, if permitted development criteria are not met.
The permitted development criteria are restrictive in respect of external wall insulation and therefore a planning application is likely to be required in most cases.
Listed building
Rarely supported.
Exceptions may include buildings whose exteriors have been severely compromised (for example, by the addition of inappropriate renders or unsympathetic general alterations) and some modernist buildings
Planning permission will almost always be required.
Listed building consent will always be required.
External wall insulation (EWI) offers a way to improve the thermal efficiency of homes built with solid walls. There are many options for external wall insulation, which can improve the energy performance of your home. It can reduce fuel bills by up to 25% and prevent condensation from forming on walls, helping to protect against mould and structural damage.
With the appropriate selection of cladding material, external wall insulation has the potential to significantly improve the appearance of your home. However, it is not appropriate for every house, as set out below. It is therefore important to refer to all the guidance here before installation.
External wall insulation finished with a top coat of render at Greenleaf Road. An increased wall depth meant all rainwater pipes had to be removed and refit
9.2.1
Certain proposals for external wall insulation are classed as permitted development and do not require planning permission. For more information please visit the Planning Portal website and the Technical Guidance on Household Permitted Development Rights. Some areas are covered by Article 4 directions and therefore permitted development may be removed, please check here.
9.2.2
Where planning permission is required for external wall insulation, applications must include existing and proposed detailed drawings at 1:10 scale showing key junctions. Drawings must clearly show the proposed material type, finish, and the junctions at openings and rooflines.
9.2.3
In application drawings, attention must be paid to connections with neighbouring buildings, and detailing around windows and other features.
9.2.4
External wall insulation is generally not acceptable for listed buildings. It may be supported in conservation areas in exceptional circumstances, and proposals are more likely to be supported on rear elevations than front elevations, and other elevations visible from public vantage points.
9.2.5
For buildings outside of conservation areas, proposals for external wall insulation will be assessed by balancing the positive environmental impact against the potential negative impacts to the character and appearance of the host building and local area.
9.2.6
For buildings outside of conservation areas, proposals for external wall insulation on elevations visible from the street will be supported, provided they are designed with regards to the character of the existing streetscape. Proposals should:
be of a complementary tone and quality to the wider streetscape.
specify materials that are robust and are detailed in a way that ensures longevity.
specify materials that are sustainable.
specify materials that are of high quality. Though brick slips can be acceptable if of high quality, adhesive brick slips are not considered acceptable.
not be incongruous, in relation to materiality, scale and quality.
respect any decorative detailing which forms part of the character of the building.
9.2.7
Pre-application submission is encouraged for all applications for external wall insulation, and especially for proposals that deviate from the criteria above.
9.2.8
The proposed facing materials for external wall insulation proposals should generally either:
match the quality and appearance of the existing facing material, or:
be complementary to and of a higher quality than the existing facing material.
9.2.9
For buildings already finished in render, external wall insulation is more likely to be supported. The external wall insulation and render should be detailed and finished to a high standard.
9.2.10
A suitably qualified professional should be engaged to ensure external wall insulation is appropriately designed for the specific building and correctly installed.
9.2.11
Insulating plaster can also sprayed onto the inside of external walls. This gives an appearance that visually very similar to plastered walls, but with the benefit of additional insulating properties.
9.2.12
For guidance on where external wall insulation is likely to be supported, residents should refer to the table below.
9.2.13
For further guidance on fitting external wall insulation in conservation areas and historic buildings, residents should refer to these guides on Retrofitting Heritage Homes.
External wall insulation installed to the rear of a house in Brixton. Careful detailing around windows ensures the insulation does not have a detrimental impact on the host dwelling, or neighbouring properties
External wall insulation and heritage
Likelihood of approval
Details and requirements
Building that is not listed, outside conservation area
Generally supported, provided it has been designed with regards to the character of the existing streetscape.
Houses
Planning permission is required, if permitted development criteria are not met.
Flats
Planning permission is always required.
Building that is not listed, in conservation area
Generally not supported, except from in some circumstances.
There may be scope for external wall insulation on front elevations where buildings currently make a neutral or negative contribution to the conservation area.
More likely to be supported on side or rear elevations, with due regard to historic character and appearance.
Planning permission is required, if permitted development criteria are not met.
The permitted development criteria are restrictive in respect of external wall insulation and therefore a planning application is likely to be required in most cases.
Listed building
Rarely supported.
Exceptions may include buildings whose exteriors have been severely compromised (for example, by the addition of inappropriate renders or unsympathetic general alterations) and some modernist buildings
Planning permission will almost always be required.
External wall insulation finished with a top coat of render at Greenleaf Road. An increased wall depth meant all rainwater pipes had to be removed and refit
External wall insulation installed to the rear of a house in Brixton. Careful detailing around windows ensures the insulation does not have a detrimental impact on the host dwelling, or neighbouring properties