Sash windows in
conservation areas.
London has 1,033 conservation areas. Replacing windows in any of them needs an approach that keeps the streetscape intact — and an installer who knows the rules.
What you can,
what you cannot.
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01
Article 4 directions
Many CAs have an Article 4 removing permitted-development rights for windows.
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02
Like-for-like
Most CAs allow timber sash replacement that matches the original profile.
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03
No uPVC
Plastic windows almost never get permission in a CA. Do not try.
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04
Front matters most
Rear elevations have more flexibility — sometimes.
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05
Group value
Even an unlisted building in a CA can have group value — means stricter rules.
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06
Enforcement
Councils do enforce — recent London cases reversed at owners expense.
Most CAs:
no consent needed.
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01
Article 4 check
We confirm whether your CA carries an Article 4 direction.
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02
Profile match
Existing window measured and replicated to 1mm tolerance.
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03
Glazing
Slim-line double glazing approved in 95%+ of London CAs.
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04
Paint
Heritage colours only — no contemporary RAL.
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05
Application (if needed)
Householder planning application, 8-week determination.
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06
Records
Drawings filed for next owner — future-proofing.
Common questions about
conservation.
Search your postcode at planning.data.gov.uk — or ask us, we have boundary maps for every London CA.
It is a council instruction that removes permitted-development rights. In windows context, it means even a like-for-like replacement needs planning permission. Common in Hampstead, Bedford Park, Highgate.
Almost always yes, if the slim-line profile matches the original. We have approved double-glazed installs in 33 London boroughs.
Free survey,
fixed quote.
Tell us about the property and we will come back within one working day with a window count, indicative price and the next available survey slot.
London NW10 7XF
+ M25 corridor