Replacing windows in a conservation area in Enfield or Barnet
If you live in one of the older parts of North London, there is a good chance your house sits in a conservation area. Enfield alone has 22 of them. That does not mean you are stuck with draughty single glazing, but it does mean the rules for replacing windows and doors are different from an ordinary street. This guide explains what changes, and how we approach a survey when a house is in a conservation area.
Is my house in a conservation area?
Both councils publish maps of their conservation areas. In our part of North London the best known include Southgate Green, the Lakes Estate between Palmers Green and Southgate, the centre of Winchmore Hill, Bush Hill Park and Enfield Town in Enfield, and Wood Street and Monken Hadley in Barnet. If you are not sure, we check your address before the survey and tell you what applies.
Do I need planning permission to replace windows?
For a house, replacing windows with ones of a similar appearance is usually permitted development, which means no planning application. In a conservation area that still often holds, as long as the new windows look like the old ones from the street.
The picture changes if the council has made an Article 4 direction. This removes some permitted development rights, so replacing windows or doors on the front of the house can need planning permission even when the new ones look similar. Article 4 directions cover several conservation areas near us, including the Lakes Estate, Winchmore Hill, Bush Hill Park and Wood Street in High Barnet, where Barnet Council requires consent for window and door replacements across most of the area.
Two other cases always need care. Flats do not have the same permitted development rights as houses, so a flat owner should check before replacing windows. And a listed building needs listed building consent for any work that affects its character, which usually includes the windows.
What councils look for
Conservation area appraisals from both councils make the same point again and again: what harms the character of a street is not double glazing as such, but windows that change the look of the house. The Southgate Green appraisal names sash windows replaced by plastic casements as one of the changes that has harmed the area, and the Winchmore Hill appraisal lists replacing timber windows with uPVC as a threat to its character.
In practice that means keeping the details that people notice from the pavement:
the way the window opens, sliding sash or side hung casement
the pattern of panes and glazing bars
slim frames and sightlines close to the originals
coloured, stained or leaded glass where the house has it
front doors and porches in a style that suits the age of the house
Window styles that suit period houses
For Victorian and Edwardian houses with sliding sashes, our vertical sliding sash windows keep the original opening style, with Georgian bar options. For cottages and houses with casements, flush sash windows and Residence 9 sit flush in the frame like traditional timber joinery. If you have original coloured glass you want to keep, stained glass encapsulation seals it inside a new double glazed unit.
Building Regulations still apply
Whatever the planning position, replacement windows in England must meet Building Regulations. For an existing home that means a limiting U-value of 1.4 W/m²K or a Window Energy Rating of at least band B, and trickle vents in line with the ventilation rules that came in on 15 June 2022. Every installation we carry out is registered with Assure Certification, and you receive the certificate afterwards.
How we handle it at the survey
When we visit, we check whether the house is in a conservation area, whether an Article 4 direction or listing applies, and what the council is likely to accept on your street. We then suggest windows and doors that keep the character of the house, and explain clearly if an application is likely to be needed.
We cover conservation areas across Southgate, Palmers Green, Winchmore Hill, Enfield and Barnet. To book a free survey, call the showroom on 020 8361 0128 or request a quote online.