Heritage Window Draught Proofing
Preserving the character of a period property often means working with original features — and for many homeowners, that includes beautiful but draught-prone sash or casement windows. While their craftsmanship and charm are undeniable, heritage windows can also be a source of heat loss and discomfort in colder months.
Heritage window draught proofing offers a practical solution: retaining the authentic look of your property while improving comfort and energy efficiency.
Why Draught Proofing Is Essential for Period Properties
Historic homes, particularly those built before double glazing was standard, were constructed with different priorities. Natural ventilation was often part of the design, but over time, timber frames, glazing putty, and joints can deteriorate, creating unwanted draughts.
Key reasons to draught proof your heritage windows include:
- Heat Loss Reduction – Gaps in window frames allow warm air to escape, driving up heating bills.
- Improved Comfort – Eliminating cold spots and draughts makes rooms more pleasant year-round.
- Noise Reduction – Seals help to dampen external noise without changing the window’s appearance.
- Preservation – Carefully chosen draught seals protect timber frames from excess moisture and movement.
For listed buildings, draught proofing can also be one of the most cost-effective and least invasive ways to improve efficiency while meeting conservation requirements.
Common Draught Sources in Heritage Windows
Understanding where draughts enter is the first step to effective sealing.
Typical sources include:
Gaps around the sash frame – Wear and seasonal movement can create small openings around sliding sashes.
Meeting rails – The point where top and bottom sashes meet can leak air if not snugly fitted.
Glazing putty shrinkage – Over time, putty around the glass can crack, allowing cold air to enter.
Hinge and hardware joints – On casement windows, loose hinges and warped frames create gaps.
Ventilation slots or trickle vents – Necessary for airflow but often a source of heat loss if left unprotected in winter.
Effective Draught Proofing Solutions
Modern draught proofing methods can be tailored to the style and needs of your heritage windows.
Brush Seals
Flexible brush strips can be fitted into discreet channels along the sash or casement frame. They are virtually invisible when the window is closed, allowing smooth movement while blocking air infiltration.
Perimeter Seals
Rubber or foam perimeter seals can be placed along the edges of the window frame to create a tight seal. For heritage properties, conservation-grade seals are available that blend with timber finishes.
Vent Covers
Magnetic or removable vent covers provide a seasonal option — allowing you to block draughts in the colder months while preserving ventilation when needed.
For listed buildings, all products should be sympathetic to the original design and, where possible, reversible to comply with planning requirements.
Benefits: Energy, Comfort, Preservation
Draught proofing heritage windows delivers multiple benefits:
Energy Savings – The Energy Saving Trust estimates that draught proofing can save up to £60 per year on heating bills for a typical home.
Enhanced Comfort – Eliminates cold zones near windows, creating a more consistent indoor temperature.
Preservation of Original Features – Quality seals prevent rattling, reduce moisture ingress, and extend the lifespan of timber frames.
Sustainability – Improves efficiency without replacing historic materials, reducing waste and environmental impact.
Professional Installation vs DIY
While there are DIY kits available for draught seals for period homes, professional installation offers several advantages:
Professional Benefits
- Bespoke fitting for irregular frames and non-standard window sizes.
- Use of conservation-approved materials.
- Workmanship that ensures smooth sash or casement operation.
DIY Considerations
- More affordable upfront but may be less durable.
- Requires precision to avoid affecting window movement.
- Best suited for minor gaps and non-listed properties.
If your home is listed or in a conservation area, it’s best to consult a specialist who understands heritage regulations.
FAQs
1. How do I stop draughts from timber sash windows?
By installing discreet brush or perimeter seals, repairing glazing putty, and ensuring smooth operation of the sashes.
2. Will draught proofing affect window appearance?
When done correctly, seals are almost invisible and do not alter the historic look.
3. Is it reversible for listed buildings?
Yes — many conservation-approved methods are fully reversible to protect heritage value.
4. How much energy can draught proofing save?
Depending on property size and draught levels, it can cut heating bills by up to 15% annually.