Do I Need Planning Permission?
Permitted Development
You should not need planning permission if you are fitting windows which are identical, like-with-like replacements.
When you update or replace existing windows, in most cases, a formal planning application and planning permission is not required and you can carry out the work under Permitted Development.
However, if the new windows differ in appearance or size to those you are replacing (for instance, different glazing patterns) you may need to apply for planning permission.
Enquire HereBuilding Regulations
Since 1 April 2002 building regulations have applied to all replacement glazing. The regulations apply to thermal performance and other areas such as safety, air supply, means of escape and ventilation.
An external window or door is a "controlled fitting" under the Building Regulations and as a result of this classification these Regulations set out certain standards to be met when such a window or door is replaced.
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Thermal Heat Loss
Dwellings are required to be energy efficient. A method of achieving greater energy efficiency is to take steps to reduce the amount of heat that is lost through the glazing in both windows and doors.
If you are to install windows and doors you should be aware that they need to comply with the requirements of the Building Regulations in relation to the amount of heat that can pass through the glass and framework, which is measured as a U-Value. This U-Value should not be exceeded.
Enquire HereSafety glazing
Safety glazing should be provided to any glass in a critical area. Below is a list giving a general view as to when safety glazing is required:
On any panel (e.g. on internal and external walls and partitions) up to 800mm from floor level.
Within any glazed door up to 1500mm from floor level.
On any side panel to any door up to 300mm from the edge of the door, up to 1500mm from floor level.
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Ventilation Planning
Windows and doors provide ventilation to rooms within a dwelling and rules apply to how much ventilation. The type and extent of ventilation will be dependent on the use and size of the room.
For example, rooms where steam will be produced (kitchens, bathrooms, utility rooms etc) should be provided with higher levels of ventilation (normally mechanical fans and windows) than other rooms where suitably sized window openings and background ("trickle") ventilators may suffice.
Enquire HereMeans of Escape
When replacing any window, the opening should be sized to provide at least the same potential for escape as the window it replaces. If the original window that is being replaced was larger than necessary for the purpose of escape, then the new window opening could be reduced down to the minimum as specified in the criteria below.
The means of escape should be considered for any new window installed to an extension or existing dwelling. If an escape window is required then criteria set out below should be followed. It is also generally good practice to replace any window on the first floor that is not used as an escape window with an escape window.
Width and Height - Either of these are not to be any less than 450mm
Clear Openable Area - No less than 0.33m²
Cill height - The bottom of the openable area should be no more than 1100mm above the floor area. Only one window per room is generally required.
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