Sash Window Restoration: Your Complete UK Guide for 2024

Sash window restoration remains one of the most worthwhile investments for period property owners across the UK. Rather than ripping out original features, restoring traditional sash windows preserves character whilst delivering modern performance standards. We've seen countless homeowners wrestling with this decision, so this guide walks you through everything you need to know about restoring, repairing, or replacing your windows and doors. ## Key Takeaways Professional sash window restoration typically costs £800–£1,500 per window, compared to £1,200–£2,000 for full replacement Modern draught-proofing and secondary glazing can achieve U-values as low as 1.8 W/m²K without compromising original features uPVC windows may be cheaper initially (£300–£600 per window) but last 20-25 years versus 60+ years for restored timber sash windows Always check if your property sits within a Conservation Area before replacing original windows — you may need planning permission Energy-efficient windows must meet Building Regulations Part L requirements (minimum U-value of 1.6 W/m²K for replacement windows) ## Understanding Sash Window Repair vs Replacement Cost The choice between restoration and replacement isn't straightforward. Original timber sash windows in decent structural condition almost always benefit from restoration rather than replacement. Restoration involves stripping back layers of paint, replacing worn sash cords, repairing rot with timber splices, and fitting modern drau