Sash Window Insights & Guides
Regulatory updates, restoration know-how and cost guides from London's heritage sash window specialists.
- Can't Sleep Because of Traffic Noise? How Acoustic Secondary Glazing Cuts Noise by 50dB — 10.8mm Stadip Silence glass and a 150mm air gap deliver up to 50dB noise reduction in London period sash windows.
- Part L 2026 Vs Your Sash Windows: What Every London Homeowner Needs to Know — How the March 2026 Part L update affects Victorian & Georgian sash windows in London.
All sash window services
- Sash window draught elimination — Seals every gap around sashes, meeting rails and beads to stop cold air.
- Secondary glazing installation — Slim internal units for maximum thermal and acoustic performance.
- Secondary glazing vs draught proofing — Compare costs, benefits and use cases for both approaches.
- Sash window restoration — Complete refurbishment of period timber sash windows.
- Sash windows refurbishment — Cords, beads, glazing and finishes renewed by hand.
- Sash window repair — Stuck, rattling or broken sashes fixed without replacement.
- Sash cord & rope replacement — Genuine hemp cords and brass pulleys, fitted correctly.
- Heritage window restoration — Conservation-grade work for listed buildings.
- Victorian sash window draught proofing — Specialist care for 19th-century joinery.
- Thermal efficiency upgrades — Cut heating bills by up to 30% with sympathetic upgrades.
- Noise reduction for sash windows — Up to 75% quieter interiors on busy London streets.
- Window security solutions — Discreet locks, restrictors and reinforced beading.
- Ongoing window maintenance — Annual servicing to keep sashes running smoothly.
- Emergency window services — Same-day response for broken glass and failed sashes.
- Cost of draught proofing — Transparent per-window pricing from £150.
- Learn how draught proofing works — Detailed guide to the process, materials and outcomes.
Frequently asked questions
- How much does sash window draught proofing cost?
- Draught proofing is priced per window, typically £150–£600 depending on size, condition and whether cords, beads or glazing also need renewing. Every quote is fixed after a free on-site survey.
- How long does draught proofing a sash window take?
- A typical Victorian or Edwardian sash window takes 2–4 hours to draught proof, service and rebalance. A whole house of 8–12 windows is usually completed in 2–3 days with minimal disruption.
- Will draught proofing damage my period sash windows?
- No. We use conservation-grade brush and compression seals routed into the existing joinery. The work is fully reversible, protects the original timber and is approved for use on Grade II listed buildings.
- How much energy will I save after draught proofing?
- Homeowners typically see heating bills fall by around 30% after sash windows are draught proofed, and up to 75% less external noise once combined with secondary glazing.
- Do you offer a guarantee?
- Yes — every draught proofing and restoration job is covered by our 10-year workmanship guarantee, and we are fully insured for work on listed and period properties.
Why choose us
- 15 years restoring London's period sash windows
- Fully insured with a 10-year workmanship guarantee
- Conservation-friendly methods approved for listed buildings
- Free on-site survey and fixed per-window pricing (£150–£600)
- Rated 4.9/5 across 150+ homeowner reviews
Get in touch: 0207 060 1573 · info@sgs.org.uk · WhatsApp