How to Draught-Proof Windows in the UK: A Step-by-Step Guide#

Before you begin draught-proofing your windows, it's essential to gather the right tools and materials and understand the basic process. Here's what you'll need to get started:

What You'll Need#

• Prerequisites:
  • Basic DIY skills
  • Assessment of window condition
• Tools:
  • Tape measure
  • Utility knife
  • Screwdriver
  • Sealant gun
• Materials:
  • Draught excluder tape
  • Sealant
  • Brush strips

Key Takeaways#

• Draught-proofing windows can save up to £200 annually on energy bills.
• Start by measuring and cleaning window frames for effective draught-proofing.
• Use the right materials like draught excluder tape, sealant, and brush strips.
• Proper draught-proofing enhances indoor comfort and reduces your carbon footprint.

Introduction#

Draught-proofing your windows is a straightforward and cost-effective way to improve your home's energy efficiency. By sealing gaps and cracks, you can reduce heat loss, save money on energy bills, and lessen your environmental impact. This guide will walk you through the steps to effectively draught-proof your windows and reap the benefits of a more comfortable home.

Why Draught-Proofing is Important#

Energy Efficiency#

Draught-proofing is one of the simplest ways to improve your home's energy efficiency. By reducing heat loss, you can lower your energy bills significantly. According to the Energy Saving Trust, draught-proofing could save you up to £200 annually on heating costs. This is particularly beneficial in older homes where windows may not be as airtight.

Environmental Benefits#

Reducing your energy consumption not only saves money but also decreases your carbon footprint. Less energy used means fewer emissions produced, contributing to a healthier environment. Considering the UK's commitment to reducing carbon emissions, draught-proofing is a small but effective step towards this goal.

Comfort#

A well-draught-proofed home is a more comfortable one. Eliminating cold draughts can make your living spaces warmer and more enjoyable, especially during the chilly UK winters. This can also lead to a more consistent indoor temperature, reducing the need to constantly adjust your heating.

Materials Needed for Draught-Proofing#

Draught Excluder Tape#

Draught excluder tape is widely available in the UK and is generally affordable, costing around £5 to £10 per roll as of 2026. It provides a quick and easy way to seal gaps around window frames. Available in various widths and thicknesses, you can choose the one that suits your window type best.

Sealant#

Sealants come in various types, such as silicone or acrylic, and are perfect for filling gaps and cracks. Brands like Everbuild and UniBond offer reliable options, priced around £5 to £15 per tube. Silicone sealants are particularly good for areas exposed to weather, as they remain flexible and waterproof.

Brush Strips#

Ideal for sliding or sash windows, brush strips help block draughts from moving parts. Prices range from £3 to £20 depending on size and quality. For best results, choose dense, durable bristles that can withstand frequent use.

Step-by-Step Draught-Proofing Guide#

Step 1: Measure Your Windows#

What to Do: Use a tape measure to accurately assess the dimensions of your windows, including the frames.

Why It Matters: Accurate measurements ensure that you apply the right amount of draught-proofing materials without wastage.

What Happens If Skipped: Skipping this step can lead to gaps in your draught-proofing efforts, resulting in persistent draughts.

Step 2: Clean the Window Frames#

What to Do: Remove dust and debris from the window frames using a damp cloth or mild cleaner.

Why It Matters: A clean surface ensures better adhesion of draught-proofing materials, enhancing their effectiveness and longevity.

What Happens If Skipped: Dirt and grime can prevent materials from sticking properly, reducing the overall effectiveness of your efforts.

Step 3: Apply Draught Excluder Tape#

What to Do: Cut the tape to size and apply it along the edges of the window frames.

Why It Matters: The tape creates a tight seal, blocking out draughts and helping to retain heat.

What Happens If Skipped: Without the tape, draughts will continue to seep through, negating potential energy savings.

Step 4: Seal Gaps with Sealant#

What to Do: Use a sealant gun to apply sealant to any visible gaps or cracks around the window.

Why It Matters: Sealant adds an extra layer of protection against draughts, keeping your home insulated.

What Happens If Skipped: Unsealed gaps can allow air infiltration, reducing the efficiency of your draught-proofing.

Step 5: Install Brush Strips#

What to Do: Attach brush strips to the moving parts of the windows, such as sliding sashes.

Why It Matters: Brush strips prevent air from sneaking through moving parts, ensuring complete draught-proofing.

What Happens If Skipped: Draughts may still enter through movable sections, compromising comfort and efficiency.

Common Mistakes to Avoid#

Incorrect Measurements#

Taking inaccurate measurements can lead to ineffective draught-proofing, as materials may not fit properly, leaving gaps. Always double-check your measurements before purchasing materials.

Using the Wrong Materials#

Ensure you select the appropriate materials for your specific window type. For example, use brush strips for sliding windows and draught excluder tape for fixed frames. Using inappropriate materials can lead to reduced effectiveness and increased costs.

Additional Tips for Improving Window Insulation#

• Consider Secondary Glazing: This option can provide an additional layer of insulation, reducing heat loss further. For more information, check out our guide to energy-efficient double glazing.
• Use Heavy Curtains: These can act as an extra barrier against cold air, making your home even more energy-efficient. Explore our best energy-efficient curtains for more details.
• Install Window Film: This can help block draughts and improve insulation, especially in older windows. It’s a cost-effective solution for temporary measures.

Quick Summary Checklist#

• Measure windows accurately.
• Clean window frames thoroughly.
• Apply draught excluder tape.
• Seal gaps with appropriate sealant.
• Install brush strips on moving parts.

Conclusion#

Draught-proofing your windows is a practical and cost-effective way to enhance your home's comfort and energy efficiency. While you can tackle this project yourself, consider hiring a professional for complex installations. To find the right service, fill out our quote form to get professional quotes tailored to your needs.

For more energy-saving tips, read our article on reducing heating bills in winter. Additionally, if you're looking to extend your draught-proofing efforts, explore our guide on draught-proofing doors.

Sources#

• Energy Saving Trust
• GOV.UK