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.

Sash Window Insights & Guides

Regulatory updates, restoration know-how and cost guides from London's heritage sash window specialists.

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The Science of Secondary Glazing: How a 150mm Air Gap Cuts Heat Loss by 70% — For owners of period properties, improving window performance involves more than choosing the lowest U-value. Original sash windows contribute to a…
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Sash Window Soundproofing Cost Explained in Under 3 Minutes — If you are researching sash window soundproofing cost, the two most practical retrofit options are professional draught proofing and secondary glazing.
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Grade II Listed Window Draught Proofing: What Conservation Officers Don't Want You to Know — Owning a Grade II listed property does not mean you must accept cold rooms, rattling sashes and high heating bills. It means that improvements need to…
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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