Repair to original sash and case windows, is generally the most appropriate course of action and does not require planning permission.
Planning permission is not normally required for replacement windows matching or replicating the existing colours and proportions.
Planning permission is required for window replacements and alterations which will change the character of the building.
In general terms, for the replacement of sash and case windows, the best practice is to retain the existing proportions, true three-dimensional effect, transom height and astragal details. If this is carried through then no planning permission is required.
When replacing sash and case windows on elevations which are immediately visible to public view, the original window proportions should be replicated. The true three dimensional effect of a sash and case window should be imitated so that the top half is proud of the bottom half to give the appearance of sash and case windows when closed; the transom bar should be at the same height; and the same number and thickness of astragals should be replicated for each window. For other window types, for example casement or top opening windows, then the existing proportions, number of glazing bars and colour should be retained.
For all replacement windows in non-listed buildings in conservation areas, where elevations are not immediately visible to public view, there are no restrictions on the type of replacement windows which can be installed and no planning permission is required for such alternative windows. This would normally be replacement windows on a rear elevation and facing onto a private garden or courtyard.
In the case of tenement blocks / flats / semi-detached properties or terraced properties where 50% or more of windows in the block have already been changed to modern alternatives and have lost their three dimensional effect or original glazing pattern then there is no requirement to replace windows with three dimensional proportions / original glazing pattern. If a “dummy” transom height to match existing windows is installed no planning permission will be required.
For all replacement windows in non-listed buildings in conservation areas, the best practice is to retain the existing colour where possible. However there is no control over colour of replacement windows for detached houses. For semi-detached dwelling houses, terraced houses or flats, planning permission is not required for a change in colour where 50% or more of properties in the row or block have already had a change from the original unified colour, e.g. from white painted to brown stained windows. In all cases, there is no control over the colour of replacement windows where they are not immediately visible to public view, usually on a rear elevation and facing onto a private garden or courtyard.
In sensitive and open areas, such as Logie Conservation Area, the criteria for replacement windows on public elevations will apply throughout i.e. front, side and rear elevations.
Sometimes additional controlled ventilation is required, and preferred best practice should be followed. If additional ventilation is required this should be achieved by means of discreet/concealed vents, rather than by the addition of prominent trickle vents.
Altering the size of the window opening may require Planning Permission.
It is recommended that the City Council (City Development) is always contacted to discuss window proposals, prior to the windows being installed.
Non-listed properties out with Conservation Areas
All residential properties outwith a Conservation Area which are not listed buildings do not require planning permission for replacement windows and doors.
Best practice should consist of the repair to original sash and case windows and doors over replacement, or if replacement is sought the existing characteristics should be respected. Replacement windows of commercial properties should retain the existing appearance and characteristics of the building. Planning permission is required for altering the external appearance of a non residential property.
Altering the size of the window opening may require Planning Permission.
It is recommended that the City Council (City Development) is contacted to confirm planning permission is not required, prior to the works commencing.