Without a doubt! A home can be made more comfortable, more energy efficient, and less noisy by installing double glazing. This is an excellent technique to improve energy efficiency.

A great number of individuals who own older homes are curious about the possibility of installing double glazing into their existing wooden windows rather than having to replace the complete unit by itself. 

The encouraging news is that it is possible to double-glaze windows that are already made of wood. By using this method, it is possible to preserve the personality and appearance of classic timber frames while simultaneously reaping the benefits of contemporary double glazing. Allow me to explain how this can be accomplished, as well as the benefits that it provides.

Can You Double Glaze Existing Wooden Windows?

Double glazing has become a popular solution for improving energy efficiency, reducing noise, and enhancing the overall comfort of a home. For those who own older properties with traditional wooden windows, a common question arises:

Can you double-glaze existing wooden windows without replacing them entirely? The answer is yes, in many cases, you can retrofit double glazing into your existing wooden window frames.

Double glazing involves using two panes of glass with a layer of insulating gas (like argon) in between, which improves thermal efficiency and reduces noise transmission. The ability to retrofit double glazing into wooden windows provides several benefits:

  • Preservation of Aesthetic: By double-glazing existing wooden windows, you maintain the original character and charm of older homes, which can be crucial for heritage properties or period-style houses.
  • Cost Savings: Retrofitting double glazing can be more cost-effective than replacing entire windows. It avoids the need for new frames, which can be expensive, especially for custom or unique window designs.
  • Improved Insulation: Adding double glazing to existing wooden windows can significantly improve energy efficiency by reducing heat loss in winter and minimizing heat gain in summer. This can lead to lower energy bills and a smaller carbon footprint.
  • Noise Reduction: Double glazing also acts as a sound barrier, making your home quieter by reducing outside noise.

To retrofit double glazing into existing wooden windows, a specialist will typically:

  • Assess the Condition of the Frames: Wooden window frames must be in good condition to support the additional weight of double glazing. Any rot or structural issues should be repaired beforehand.
  • Measure and Fabricate: Accurate measurements are taken to create custom double-glazing units that fit the existing frames.
  • Install the Double Glazing: The old glass is removed, and the new double-glazed units are installed in the existing frames. This process requires careful craftsmanship to ensure a secure fit and proper sealing.
  • Finish and Seal: The edges and seals are finished to ensure weatherproofing and durability.

Retrofitting double glazing into existing wooden windows is a feasible option for many homeowners looking to improve energy efficiency without compromising the aesthetics of their property. However, it is essential to work with experienced professionals who specialize in this type of installation to ensure a successful outcome.

How To Install Double-Glazed Units In Wooden Frames?

Installing double-glazed units in existing wooden window frames is a task that requires precision and skill. This process can help improve energy efficiency and reduce noise, while also preserving the original charm of your home’s wooden frames. Here’s a step-by-step guide on how to install double-glazed units in wooden frames, find more info here:

Step 1: Assess the Wooden Frames

  • Check the Condition of the Frames: Before starting, ensure that the existing wooden frames are in good condition. Look for signs of rot, warping, or structural damage. If there are issues, they need to be repaired before installing double glazing.
  • Measure the Frames: Accurate measurements are crucial for a proper fit. Measure the height, width, and depth of the existing frames to ensure that the new double-glazed units will fit precisely.

Step 2: Select Double-Glazed Units

  • Choose the Right Units: Consult with a professional to select double-glazed units that meet your needs. Consider factors like the type of glass, the insulating gas used (such as argon), and the overall thickness of the unit.
  • Custom Fabrication: Based on your measurements, the double-glazed units should be custom-made to fit your wooden frames. This ensures a snug fit and optimal performance.

Step 3: Remove the Old Glass

  • Safety First: Wear safety goggles and gloves when removing the old glass. Keep a drop cloth or plastic sheeting to collect any debris or broken glass.
  • Remove Glazing Beads or Putty: If your windows have glazing beads, carefully remove them with a putty knife or pry bar. If they’re held in place with putty, soften them with a heat gun before removal.
  • Take Out the Old Glass: Gently remove the old glass pane, ensuring no damage to the wooden frame.

Step 4: Install the Double-Glazed Units

  • Prepare the Frame: Clean the frame thoroughly, removing any debris or old putty residue. Ensure the surface is smooth and free from defects.
  • Apply Sealant or Glazing Tape: To create a weatherproof seal, apply a suitable sealant or glazing tape around the edges of the frame.
  • Insert the Double-Glazed Unit: Carefully place the double-glazed unit into the frame. Ensure it’s centered and level.

Step 5: Secure the Glass and Finish

  • Replace Glazing Beads or Apply Putty: If you removed glazing beads, reattach them using small nails or brads. If using putty, apply it around the edges and smooth it for a clean finish.
  • Add Seals and Weatherstripping: To further improve insulation, consider adding weatherstripping around the frame. This helps prevent drafts and water infiltration.
  • Finish and Paint: Once the glass is secure, paint or stain any exposed wood to match the existing finish and protect against moisture.

Step 6: Test and Maintain

  • Test for Air Leaks: After installation, check for air leaks or drafts around the window. Use a candle or incense stick to identify any airflow.
  • Regular Maintenance: To keep your double-glazed units in good condition, perform regular maintenance, including repainting or re-staining the frames as needed and checking for any signs of deterioration.

By following these steps, you can successfully install double-glazed units in wooden frames, improving energy efficiency and comfort while maintaining the traditional look of your windows. If you’re not experienced in this type of work, it’s advisable to hire a professional to ensure a safe and high-quality installation.


Homeowners who wish to increase energy efficiency, decrease noise, and preserve the classic look of their windows can retrofit double-glazed units into existing wooden frames. This method may be less expensive than replacing all of the windows in a house, and it has many advantages, such as keeping the house’s historic character, improving insulation, and decreasing heat loss.

Nevertheless, accuracy, thorough planning, and focus on detail are essential for a successful installation. After checking the state of the wooden frames, the next step is to remove the old glass and install the new double-glazed units with precision.

For the best results and longest lifespan, make sure you use a secure seal and finish it properly. To guarantee a safe and effective installation, it is advisable to obtain expert assistance if you are not skilled in this type of job.

Modern double glazing has many advantages, and with the correct method and skill, you may have them all while preserving the classic beauty of your wooden window frames. Your double-glazed windows can last for many years, adding comfort, energy savings, and value to your house, if you take care of them according to industry standards and execute routine maintenance.

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