Secondary Glazing for Sash Windows in Cheltenham
Secondary glazing adds a slim, discreet panel inside your original sash window, so you keep every piece of historic timber and glass while cutting heat loss by up to 60% and street noise dramatically. It is the thermal upgrade of choice in Cheltenham conservation areas and listed buildings where replacement or retrofit double glazing has been refused. Most houses are measured, made and fitted within two to three weeks.
Request a Free Restoration Survey
Tell us about your windows and we will arrange a no-obligation survey, usually within five working days.
Who secondary glazing suits
Secondary glazing suits period homes in Montpellier, Lansdown, Pittville, Charlton Kings and Leckhampton where the original windows must stay untouched. If your room is cold at the glass, loud with traffic, or the windows carry irreplaceable crown glass, a secondary panel solves it without consent complications.
- Conservation area and Article 4 homes where double glazing has been refused
- Listed buildings where original windows and glass must remain in place
- Rooms that are cold at the glass despite good heating
- Bedrooms and sitting rooms troubled by traffic noise
- Original crown or cylinder glass you do not want to lose
- Condensation and mould forming on the glass each winter
From survey to installation
Four stages over two to three weeks: survey and measure each reveal, manufacture the panels to size, fit and seal on site, then finish and demonstrate. Nothing is fixed to the historic window itself — panels mount to the reveal or sub-frame, keeping the installation fully reversible.
Step 1
Survey and measure
We measure every reveal to the millimetre, check sash operation and agree panel types, colours and ventilation with you.
Step 2
Manufacture
Panels are made to order with low-E or acoustic glass in slim powder-coated frames, colour-matched to your joinery.
Step 3
Fit and seal
Panels are fixed to the reveals — never the historic window — sealed against draughts, and aligned so the sashes still open freely.
Step 4
Finish and demonstrate
Trims are finished, everything is cleaned, and we show you how to remove, open and maintain each panel.
Specification detail
- Slim powder-coated aluminium frames colour-matched to your window joinery
- Low-E glass as standard, with acoustic laminated options for busy roads
- Vertical sliding, hinged or lift-out panels matched to how you use each window
- Mounted to the reveal, not the historic fabric — fully reversible for listed buildings
- Discreet trickle ventilation options to keep airflow and prevent condensation
- 10-year guarantee on panels and installation
We work throughout Montpellier, Pittville, Charlton Kings, Leckhampton, Lansdown and the wider Cheltenham conservation areas. See the full range of sash window repairs in Cheltenham.
Listed Building Window Regulations in Cheltenham
What you can and cannot do to windows on a listed building or in a conservation area — and why secondary glazing is usually the answer where other upgrades are refused.
Read the guide