Restoration, Upgrades and Replacement Options for Your Wooden Sash Windows

Original wooden sash windows are a timeless architectural feature that add elegance and charm to any home. However, as they age, they can become a source of drafts, energy inefficiency, and maintenance challenges. Whether you’re looking to preserve their original character or upgrade to modern functionality, here are some practical options to restore, improve, or replace them.

1. Draft Proofing

If your sash windows are letting in cold air, draft proofing is an effective and cost-efficient solution.

• What it involves: Adding brushes, seals, or specialized strips to block gaps between the sashes and frames.
• Benefits:
  • Reduces energy bills by keeping heat inside.
  • Retains the original windows while improving comfort.
  • Can help stop windows rattling.
  • Cost-effective compared to complete replacement.
• Professional or DIY: You can tackle draft proofing yourself with kits available online, or hire a specialist for a more seamless and durable solution.

2. Redecoration

Over time, sash windows may show signs of wear, peeling paint, or discoloration. Regular maintenance can restore their aesthetic appeal.

• What it involves:
  • Removing old paint and sanding down surfaces.
  • Applying primer, paint, or varnish to protect the wood and enhance its appearance.
• Benefits:
  • Extends the life of your windows.
  • Enhances curb appeal and matches your home’s decor.
  • Prevents wood rot and weather damage.
• Tips: 
  • Choose weatherproof paints or finishes, and pay special attention to joints and edges. 
  • If the putty is cracked this should be carefully hacked off and re-puttied using linseed-oil putty before being overpainted
• Professional or DIY: If you have experience decorating you should be able to tackle the job yourself, just be careful not to paint the sashes in. If the glazing needs to be re-bedded with new putty, a glazier may be the best choice for this task to give a neat finish before the putty is overpainted.

3. Replacing the Sashes

If the frames are in good condition but the sashes (the moving parts) are damaged or outdated, replacing them might be the right choice.

• What it involves: Installing new sashes into the existing frames, either as replicas or modernised versions.
• Benefits:
  • Maintains the original frames, reducing waste.
  • Allows for upgrades like double glazing for better insulation.
  • More affordable than full replacement.
• Considerations: 
  • Ensure the replacements match the original design if you’re in a conservation area.
  • If you are looking to have the new sashes double-glazed, the existing box frames need to be deep enough. We suggest the new sashes should be at least 45mm thick in order to accept a double-glazed unit, but we have ways of making narrower sashes work if needed.
  • In order to make replacement sashes worthwhile, the frames need to be in good condition. Check for rot in the sills and the bottom of the pulley-stiles, and also that the frame is still square. If there is a lot of rot, it may be more economical to consider replacing the frames too
  • Remember to factor in the ongoing cost of redecorating the frames over time when weighing up the cost of new sashes v. complete replacement.

4. Complete Replacement

When the windows are beyond repair or no longer meet your needs, replacing them entirely can be the best option.

• What it involves: Removing the entire window (sashes, frame plus any internal trims like architraves and window boards etc.) and installing new units.
• Options:
  • Timber replacements: Preserve the traditional look with modern efficiency. The most environmentally friendly solution.
  • uPVC sash windows: Cost-effective and low-maintenance but may lack authenticity and will likely have a shorter lifespan, not to mention the environmental impact.
  • Aluminium sash windows: Durable and sleek, suitable for modern designs. Modern designs are better at retaining heat than older profiles, but they do not usually have a traditional appearance.
• Benefits:
  • Maximises energy efficiency with modern glazing.
  • Eliminates long-term maintenance issues.
  • Provides the opportunity for a completely new look.
• Considerations: This is the most expensive option and might require permissions in listed buildings or conservation areas.

Making Your Decision

Choosing the best option depends on your priorities:

• Budget: Draft proofing and redecoration are more affordable, while complete replacement requires a bigger investment.
• Aesthetics: If preserving your home’s period character is important, prioritize restoration or timber replacements.
• Energy Efficiency: Upgrading sashes or replacing windows can significantly improve insulation.
• Long-Term Plans: Think about how much maintenance you’re willing to commit to in the future. Complete replacement will have the least maintenance.
• Curb appeal: In the right property, when done sympathetically, new wooden sash windows should pay for themselves when you decide to sell.

Choosing a supplier

If you are looking for complete replacement, we always recommend you consider the following:

• • Use a FENSA registered firm.
  • Consider other memberships, such as the British Woodworking federation or thew “Made In Britain” campaign.
  • Find out how long has the firm been established.
  • Seek references and recommendations.
  • Always look at previous work – view examples, speak to customers.
  • Find out where the windows are made; imported windows might save you a few pounds, but is the quality any good? And will the company still be there in the future should you ever need them?

Final Thoughts

Your sash windows are a valuable part of your home’s heritage. Whether you choose to draft-proof, redecorate, replace the sashes, or go for a complete replacement, there’s a solution to suit your needs. Consult a specialist if you’re unsure, and enjoy the blend of beauty and functionality your sash windows bring to your home.