Retrofitting

The changes a building is likely to undergo during the retrofit process will depend largely on the age of the building. Internal changes such as draught-proofing and internal insulation will most likely not require planning permission. 

External changes, for example changes to the roof, external wall insulation or heat pump installation, could require planning permission. Some of these updates may be allowed through permitted development rights, provided you meet the limits set through legislation.¹ 

Glazing 
Glazing is the process of adding glass into window fittings. This adds an extra layer to the window, to helps trap heat inside a building. 

Depending on the budget of the project and severity of issues with the building, different levels of glazing may be required. Secondary glazing is less effective than double or triple glazing but may be sufficient for development, as it does not require planning permission and may be more suitable in listed buildings or conservation areas. 

Double and triple glazing can often require planning permission, however, they may be allowed through permitted development rights, provided limits are met. 

Draught-proofing 
Draught-proofing is the process of filling gaps around windows, doors, floors and chimneys to improve a building’s thermal efficiency. It is a cost-effective  way of improving energy efficiency and saving money as a result. 

The process of draught-proofing does not require planning permission; it is primarily an internal change that does not affect the external appearance of the building. 

Insulation 
Adding or increasing the amount of insulation can massively improve the energy efficiency of a building. It is important to identify the areas which are losing the most heat and energy.  

There are different types of insulation dependent on the area of the building that requires upgrading. If the work affects the external appearance or dimensions of the building, then it is likely to require planning permission. However, internal insulation, whether this be for a floor, ceiling/loft or cavity wall, will not require planning permission.

1. https://mcas-proxyweb.mcas.ms/certificate-checker?login=false&originalUrl=https%3A%2F%2Fwww.legislation.gov.uk.mcas.ms%2Fuksi%2F2015%2F596%2Fschedule%2F2%3FMcasTsid%3D15600&McasCSRF=1831e6a25d998e3dda6b489cb655a5681d7f812a3378c6c25b3708e4f3f0b3c4