“Double glazed windows that are not draught
proofed will offer no more thermal protection
and insulation than single glazed sash
windows!
Sash window draught proofing London by
Mortice & Green sash window repairs
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Sash Window Draught Proofing
At Mortice & Green, we provide specialist sash window draught proofing services throughout London, helping homeowners improve comfort, reduce heat loss and preserve the character of their original timber windows. As a family-run business established in 1994, we have over 30 years of experience repairing, restoring and upgrading traditional sash windows without compromising their period appearance. Our highly skilled restorative joiners install discreet draught-proofing systems that eliminate cold draughts, rattling windows and unnecessary energy loss while allowing your sash windows to continue operating smoothly. Whether your windows are part of a listed building, a conservation area or a traditional period property, we provide tailored solutions backed by exceptional workmanship and outstanding customer care.
Reduce Draughts Without Replacing Your Original Windows
One of the most common complaints with traditional sash windows is the amount of cold air that enters the property through gaps created by years of natural movement and wear. Over time, ageing sash cords, worn timber, loose staff beads and deteriorated parting beads can allow unwanted draughts to pass through the window, making rooms feel colder and increasing heating costs.
Our sash window draught proofing service is designed to eliminate these problems while retaining your original windows. As part of a complete refurbishment, we replace worn sash cords, rebalance the sashes, renew parting beads and staff beads where required, service pulley wheels, repair catches and locks, and install discreet brush pile draught-proofing systems integrated within the timber beads. Once completed, your windows open and close smoothly, operate quietly and provide significantly improved insulation without altering their traditional appearance.
Unlike temporary sealants or DIY draught excluders, our professional draught-proofing system offers a long-lasting solution that enhances both comfort and the overall performance of your original sash windows.
Improve Energy Efficiency While Preserving Period Features
Professional sash window draught proofing offers one of the most cost-effective ways to improve the energy efficiency of period properties. Since windows are often one of the biggest sources of heat loss within a home, reducing unwanted air movement can make a noticeable difference to indoor comfort throughout the year.
At Mortice & Green, we believe in preserving original timber windows wherever possible rather than recommending unnecessary replacements. Our restoration-led approach allows homeowners to retain the charm, craftsmanship and historical character of their existing windows while benefiting from improved thermal performance and reduced rattling.
Where appropriate, draught proofing can also be combined with additional restoration work or slimline double glazing upgrades to further enhance insulation whilst maintaining the property’s original appearance. Every project is carefully assessed to ensure the most suitable solution is recommended based on the condition of the existing windows and the individual requirements of the property.
Our aim is always to extend the lifespan of your original windows whilst improving their everyday performance for many years to come.
Why Choose Mortice & Green for Sash Window Draught Proofing?
Mortice & Green has been repairing and restoring traditional sash windows across London since 1994, earning a reputation for exceptional craftsmanship, honest advice and outstanding customer care. Every quotation is carried out by one of the company proprietors, and all work is completed exclusively by our experienced in-house restorative joiners. We never subcontract our projects, ensuring every installation meets our exacting standards.
Our independent workshop allows us to manufacture replacement timber components where necessary, helping us restore windows rather than replace them whenever possible. We only recommend work that is genuinely required and provide straightforward quotations with no hidden costs.
All of our sash window repairs and draught-proofing work are completed using premium-quality materials and proven restoration techniques. Every repair is backed by our minimum three-year guarantee, giving homeowners complete confidence that their investment is built to last.
By taking on a carefully managed workload, we ensure every customer receives the personal attention and high standard of workmanship that has made Mortice & Green one of London’s most trusted sash window specialists.
Areas We Cover for Sash Window Draught Proofing
Mortice & Green provides professional sash window draught proofing services across London, helping homeowners improve the energy efficiency and performance of their original timber windows. Our experienced team regularly works in:
- North London
- South West London
- West London
- North West London
- Central London
- Islington
- Hackney
- Kensington
- Chelsea
- Fulham
- Putney
- Wimbledon
- Hampstead
- Notting Hill
- Mayfair
- Belgravia
We also cover many surrounding towns and boroughs across Greater London. If your area isn’t listed above, please get in touch and our team will be happy to confirm whether we can assist with your sash window draught proofing project. We offer free, no-obligation site surveys and expert advice for both period and modern timber properties.
How Much Does Sash Window Draught Proofing Cost?
The cost of sash window draught proofing depends on the size and condition of the windows, along with any restoration work required before the draught-proofing system can be installed.
As a general guide:
- Professional sash window draught proofing: from £200–£400 per window.
- Sash cord replacement (if required): from £120–£250 per window.
- Full sash window refurbishment and renovation: from £400–£900 per window when additional repairs are needed.
Every property is different, which is why we provide free, no-obligation quotations following a detailed inspection of your windows. Our honest recommendations ensure you only pay for the work that is genuinely necessary, helping you improve your home’s comfort, reduce energy loss and preserve your original timber windows for years to come.
Give us a call today for sash window draught Proofing London
020 7118 9191
Frequently Asked Questions
How does sash window draught proofing work?
Sash window draught proofing involves fitting a system of discrete brush pile seals and compression seals into the channels and meeting rails of your existing sash windows. The brush piles are integrated within the parting beads and staff beads that hold the sashes in place, creating a continuous seal around the perimeter of each sash that eliminates draughts without restricting the opening and closing operation of the window. The system is virtually invisible once installed and does not alter the appearance of the window.
How much does sash window draught proofing cost in London?
Sash window draught proofing typically costs from £200 to £400 per window depending on the size of the window, its current condition, and whether any preparatory work is required to the timber before the draught proofing system can be fitted. For properties with multiple windows requiring draught proofing, we offer competitive pricing for combined quotations. Mortice & Green provides free, no-obligation quotations – call 020 7118 9191 to arrange a survey.
Will draught proofing make a noticeable difference to heat retention in my London home?
Yes – sash windows are often the single largest source of heat loss in period London properties, and effective draught proofing can make a significant difference to comfort and heating bills. Original unmodified sash windows can lose as much heat through gaps as a small open fireplace. A properly installed draught proofing system eliminates the draughts at the primary points of air infiltration, around the sashes, at the meeting rail, and at the top and bottom of the frame, producing a noticeably warmer and quieter room.
Can sash windows be draught proofed without affecting how they open and close?
Yes. The brush pile draught proofing system Mortice & Green installs is specifically designed to maintain the full sliding operation of the sash windows. Both sashes should continue to open, close, and be held in any position as before. In many cases, the draught proofing installation also includes minor adjustments to the sash operation, easing stiff sashes and ensuring the weight-to-sash balance is correct, so windows often operate more smoothly after draught proofing than before.
Is sash window draught proofing permitted in conservation areas in London?
Yes. Draught proofing is carried out entirely within the existing window frame without altering the external appearance of the window in any way. It is therefore acceptable in virtually all conservation areas and on listed buildings across London, where external modifications to windows are often restricted. If you have any specific concerns about your property, Mortice & Green will advise at the survey stage.
How long does sash window draught proofing take to install?
A single sash window typically takes three to four hours to draught proof. For a full bay window of three sashes, the work takes approximately a day. We minimise disruption throughout and leave the property clean on completion. We carry all required materials and tools to complete the work in a single visit in most cases.