Double glazing is often associated with modern homes, but it's come a long way from bulky, plastic-framed units. For period properties with traditional timber sash windows, modern glazing options now offer warmth and sound insulation without compromising historical aesthetics.
Early Concerns with Double Glazing
In the past, double glazing meant thick profiles and noticeable spacer bars, making them unsuitable for heritage properties. Installations often altered the appearance of original windows, leading to planning rejections in conservation areas.
Enter Slimline Double Glazing
Today's slimline units have revolutionised the market. These units:
- Fit within traditional sash profiles,
- Use narrower cavity spacing (e.g. 6–8mm),
- Maintain the original look from street view.
They're virtually invisible to the untrained eye but offer performance close to standard double glazing.
Heritage-Friendly Technologies
Slimline double glazing now features:
- Low-E coatings for better thermal performance,
- Argon or krypton gas fills,
- Warm edge spacers in neutral tones.
This makes it possible to retain your timber frames while enjoying modern comfort.
Regulations and Planning
In listed buildings or conservation areas, permission may still be required. However, many local authorities now approve slimline double glazing if it’s sympathetically designed.
Secondary glazing is another option – adding an internal pane to existing sashes without changing the original window.
Retrofitting vs Replacing
In many cases, existing sashes can be routed out and reglazed with slimline units. This retains more of the original joinery and can be more cost-effective than full replacement.
For irreparable windows, PM Windows can craft bespoke new sashes with slimline double glazing – replicating historic details exactly.
Final Thoughts
Double glazing no longer means compromising on style. With the right products and craftsmanship, even period homes can benefit from warmth, efficiency and elegance.
Trust PM Windows to advise you on the best solution for your heritage property.
