1. Inspect the Timber and Paintwork Thoroughly
Begin with a detailed visual inspection. Focus particularly on:
- Lower sashes,
- Window sills,
- Joints and meeting rails.
Look for flaking paint, cracks, or signs of exposed timber. If timber is left untreated, moisture can quickly soak in and lead to rot. Pay special attention after a rainy autumn – areas already absorbing water may darken, feel soft, or produce mould.
If you find early signs of deterioration, act quickly. Minor cracks or flaking can usually be sanded down and sealed. But anything deeper might require professional attention.
2. Clean Out the Channels and Tracks
Over the course of a year, sash window channels accumulate all sorts of debris – dust, cobwebs, and even insect nests. Use a soft brush or narrow vacuum nozzle to clean:
- The internal channels where sashes slide,
- Window cills,
- Pulley boxes (if accessible).
Clean channels reduce strain on sash cords and pulleys, making it easier to open the windows for ventilation during milder winter days.
3. Lubricate Moving Parts and Hardware
Cold weather can stiffen mechanisms. To ensure your windows glide smoothly:
- Apply sash wax (or candle wax in a pinch) to the runners,
- Lubricate pulleys with a light oil,
- Check and oil hinges or locks.
Avoid WD-40 as it tends to attract dust and isn't suitable for all traditional window components.
4. Check for Draughts and Seal Gaps
Even a small gap around your sash window can let in an uncomfortable draught. To detect where cold air is entering:
- Hold a candle or incense stick near the frame edges,
- Watch for flickering or smoke trails.
Common draught points include:
- Where the sashes meet,
- At the staff and parting beads,
- The base of the lower sash.
If draughts are detected, consider installing or upgrading brush seals or weather strips. These can often be fitted without affecting the appearance of the window – a key point for listed buildings or conservation areas.
5. Refresh Paint and Protective Coatings
If your last repaint was more than five years ago, winter is a good motivator to check the condition of your paintwork. Any areas of wear should be:
- Sanded back to stable timber,
- Primed with a suitable wood primer,
- Coated with microporous, weather-resistant paint.
This type of paint allows moisture inside the wood to escape while protecting it from rain, frost and pollution – crucial in the British climate.
6. Bonus Tip: Consider Secondary Glazing for Comfort
Even with perfect maintenance, single-glazed sash windows will lose more heat than double-glazed units. For homeowners who want better thermal performance without compromising period aesthetics, secondary glazing is the ideal solution.
You can choose from:
- Magnetic panels (removable for cleaning),
- Sliding internal windows,
- Fully bespoke secondary systems.
Secondary glazing is especially valuable in high-noise or draught-prone locations and often doesn't require planning permission – even in listed homes.
Caring for your sash windows before winter arrives is one of the smartest investments you can make in your property. Not only does it help retain heat and cut energy bills, but it also protects your valuable timber frames from long-term damage.
If you’re short on time or unsure where to start, PM Windows offers professional winter preparation services across London and surrounding areas. From inspections and draught-proofing to repairs and repainting, we help ensure your windows are as winter-ready as your wardrobe.
Schedule seasonal maintenance with our team.