Sash Window Repair: Consent And Other Issues

12/08/2016 - 3 minutes read

Sash Window Repair: Consent And Other Issues 

If you’re lucky enough to live in a period property, and particularly if it’s a Grade 1 listed or Grade 2 listed building, you’ll be fully aware that the privilege of living with history is balanced by an equal responsibility.

The joy of being surrounded with the markers of Georgian and Victorian architecture (sash windows, plasterwork ceilings) comes with the trusted guardianship of these features for future generations.

Getting permission to renovate or repair however, and knowing exactly how these renovations should be undertaken, can seem more than a little daunting. Where to begin? Here are some general rules of thumb.

For Listed Buildings 

Firstly, permissions for repair are only necessary under specific circumstances. Usually, like-for-like repairs to listed buildings don’t demand Listed Building Consent, although you may be requested to show details of your intended repairs so the Conservation Section can be confident in your plans.

If you’re looking to make more drastic changes to your windows, such as complete replacement, then you almost certainly will need Listed Building Consent, and gaining this might require that you provide detailed drawings of proposed changes, to a scale of 1:10 or even 1:5 to guarantee detailing matches or is sympathetic to the original feature.

For Non-Listed Buildings 

If your building isn’t listed, your local council may still encourage you to make any repairs using sympathetic materials and matching detail, and this will apply particularly to non-listed buildings within a conservation area, so it’s always worth applying to your local council Conservation Section for approval or clarification before starting any work, to avoid problems further down the line.


Repairs are generally less expensive than you might imagine. Most sash window repairs can be carried out in situ and will be much cheaper than replacement. Rotten timber sections can be pieced in, weights and pulleys can be replaced and historic mouldings can be replaced with exact matches.

If historic windows do need to be replaced, this can be done speedily and sympathetically using traditional materials and designs to maintain the structural integrity of your home.

Envirosash provides high quality sash window restoration services to London and the South of England. We restore, draught proof and install slim double glazing into existing period windows and doors. We also manufacture bespoke made to measure windows and doors, all our joinery is crafted from Accoya wood.

Contact Alex on 0800 292 2309 today to arrange a free survey and quote with no obligation