Sash Window Advice: Care, Maintenance & Upgrades

Timber sash windows are built to last — if they’re looked after. This guide explains how to keep yours smooth, quiet and weather-tight, what to do when problems appear, and when to consider upgrades such as draught proofing or minor repairs. Need tailored advice? Request a survey and call 020 7609 3012

Quick diagnosis: common issues & simple fixes:

Draughts & rattling — gaps around sashes allow cold air and noise. A discreet draught-proofing system (/draught-proofing-system) adds brush seals and tuned beads to stop movement while keeping original looks.
Sticking or painted-shut sashes — usually solved by easing, planing, freeing paint bridges and re-cording or re-balancing the sashes.
Frayed or broken cords — replace cords and service pulleys/weights so sashes open and close smoothly again.
Flaking paint & surface decay — address early. Proper preparation and high-performance paint systems (/window-painting-service) protect timber for years.
Condensation & noise — improve ventilation and consider laminated glass in key rooms for better acoustic performance (where appropriate).
Security worries — upgrade locks, add key-operated stops and consider laminated glass at street level.

Maintenance timetable (typical guidance):

Every 6–12 months: light clean of frames & tracks; check for paint damage; lubricate pulleys/locks; clear trickle vents.
Every 2–4 years: local touch-ups to paint on exposed beads, cills and putty lines.
Every 6–8 years: full repaint externally (exposure and colour affect intervals); internal cycles are often longer.
As needed: replace sash cords; adjust or re-balance; renew seals on high-use windows/doors.
Note: Orientation and exposure (south/west facing, coastal, busy roads) can shorten intervals.

Repair vs replace: how to decide:

Repair/overhaul is ideal when timber is mostly sound but performance is poor (draughts, sticking, worn cords). Adds comfort without altering appearance.
Sectional splicing suits localised decay (cills, lower stiles, beads). Preserves original fabric and profiles.
New sashes in existing frames help where glazing or profiles need upgrading but the box frame is sound.
Full replacement is usually a last resort for severe decay or distortion — and may require permission in Conservation Areas.

Draught proofing explained:

Traditional sashes are designed with clearances to move freely. Over time these gaps grow and cause draughts. A professional draught-proofing system (/draught-proofing-system) discreetly integrates brush seals into the parting/staff beads and meeting rails, reducing air leakage, rattles and dust with minimal visual change.

Painting & protection:

Prep is everything: remove failing coatings, feather edges, repair minor defects and prime bare timber.
Use suitable systems: exterior-grade primer/undercoat/topcoats specified for timber joinery.
Keep profiles crisp: avoid heavy fillers that blunt mouldings; maintain sharp putty lines.
Mind the cill: ensure drip details and end-grain are well sealed.
For a tidy, durable finish see our Window Painting Service (/window-painting-service).

Security & safety upgrades:

Key-operated sash stops and improved fasteners.
Laminated glass at street level for added deterrence and acoustic benefit.
Restrictors/guards for upper floors and family homes.

Planning & Conservation Areas:

Most maintenance and like-for-like repairs are normally acceptable. Visible changes (profile alterations, double-glazed units, full replacements) can require consent, especially under Article 4 directions. We offer advice and sympathetic solutions that retain period character. Learn more: Working in Conservation Areas (/conservation-areas).

Costs & lead times (what to expect):

Pricing depends on quantity, condition, accessibility and finish. Overhauls and draught proofing are typically quoted per opening after survey; painting is assessed by condition and exposure. We provide fixed, itemised quotations with options where helpful.

Glossary (handy terms):

Box frame — the fixed frame housing the sashes and weights.
Parting bead / staff bead — removable trims that guide and retain the sashes.
Meeting rail — where the two sashes meet and lock.
Putty line — bevelled edge securing glass in timber rebates.
Splice repair — cutting out decayed timber and grafting in new wood to match.

FAQs:

Will draught proofing change how my windows look?

No — seals are concealed within beads and meeting points, keeping the original appearance.

Can you work in occupied homes and busy streets?

Yes. We use dust control, safe site practices and schedule works to minimise disruption.

Are uPVC replacements allowed in Conservation Areas?

Policies vary, but uPVC is often resisted on historic elevations. Repairing and upgrading original timber usually achieves better visual outcomes and approval prospects.

How long will the improvements last?

With normal use and basic care, draught seals and quality paint systems last many years. We’ll advise on simple upkeep to extend life.

Get personalised advice:

Tell us about your property and priorities — comfort, appearance, security or all three — and we’ll recommend the best route. Request a survey and call 020 7609 3012