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The great sash-window debate: Repair, replace or drag them into the 21st century

Sash windows, with their inherent charm, present a recurring dilemma for homeowners, especially as colder weather approaches. While they are often a key aesthetic feature that attracts buyers to older properties, their tendency to be draughty can lead to significant discomfort and increased heating costs. One homeowner recounts their experience of living in an east London flat with five large sash windows, initially drawn to the property's character, only to find themselves working in a dressing gown indoors due to extreme cold. Despite attempts to refit the sashes, and receiving a quote of £14,000 (now estimated at £20,000) for double-glazing, the homeowner acknowledges the beauty of sash windows, suggesting they are worth the temporary discomfort for those who appreciate their visual appeal. Historically, the vertical sash window originated in 17th-century France, but the double-hung sash with a counter-weighting mechanism is believed to be a British invention. This design introduced a sophisticated ventilation system superior to traditional casement windows. Robyn Pender, a senior building conservation advisor at Historic England, praises sash windows as a 'genius invention' and a 'gift' for a building, allowing for optimal ventilation control and a low-energy operation. However, Historic England also notes that traditional windows, including sashes, are under threat from modern technologies, viewing their loss as a major threat to heritage and considering them important artifacts in their own right. To address the issue of draughts and improve thermal efficiency without compromising the character of a sash-windowed home, several solutions are available. Ken Moth, deputy chair of the Victorian Society, suggests discreet draught-sealing, installing thin sealed double-glazed units (approximately 10mm–12mm thick with a vacuum between two panes of glass), or applying secondary glazing on the inside with a thin metal frame. He emphasizes that secondary glazing is less invasive and preserves the original window. Moth also points out that older windows naturally become 'wobblier' over time due to over a century of use. The approach to sash window problems depends on whether the property is listed. For unlisted buildings, homeowners have freedom in choosing window types, though Historic England advises against 'plastic' windows due to their negative impact on heritage value and environmental concerns (ending up in landfills and potentially releasing pollutants). For listed buildings, the advice is more stringent: repair is consistently encouraged, and if repair is not possible, replacement should involve accurate copies. Historic England generally views the idea of old windows being 'worn out' as a cultural trend rather than an accurate assessment of their condition, urging homeowners to exhaust all repair options before considering replacement. Andrew Cronan, senior associate director at Strutt & Parker, likens windows to 'the eyes of the house,' highlighting their importance. Modern trends show a shift towards double-glazing for sash windows. Richard Dollar, founder of The Sash Window Workshop, notes that while his company previously focused on draught-sealing, the majority of their work now involves double-glazing, driven by customer demand for eco-friendliness and improved thermal performance. His company offers two methods: replacing the entire window with a new double-glazed replica or replacing only the sliding parts within the existing box frame, with the latter often being more economical than extensive repair and re-painting. Andrew Stronach of Ryedale Joinery echoes this sentiment, stating that double-glazing dominates the market, with less than 5% of customers opting for single-glazing. He also advises regular maintenance, particularly annual re-painting of sills and lower sections of original windows, as old windows made from durable woods like Douglas fir and pitch pine benefit significantly from consistent care, preventing minor cracks from escalating into major repairs. #SashWindows #HomeImprovement #HistoricPreservation #WindowRepair #DoubleGlazing #ThermalEfficiency #PropertyMaintenance #ArchitecturalHeritage #TraditionalCraftsmanship #SashWindows #HomeImprovement #HistoricPreservation #WindowRepair #DoubleGlazing #ThermalEfficiency #PropertyMaintenance #ArchitecturalHeritage #TraditionalCraftsmanship
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