Can I improve the efficiency of my existing windows and doors?

Yes, you can significantly improve the efficiency of existing windows and doors through targeted upgrades and maintenance. Here’s a structured guide to the most effective methods, costs, and considerations for UK homeowners and businesses.

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Quick Wins: Low-Cost Improvements

Draught-proofing

• Methods: Apply self-adhesive EPDM rubber strips (for PVC/metal frames) or nail-on strips (for wooden frames). Avoid foam tape, as it degrades quickly.
• Savings: Reduces heat loss and saves ~£40/year for an average household.
• Mistakes: Using incorrect strip types for frame materials or covering ventilation points like trickle vents.

Window Film

• Application: Self-adhesive polymer films can be applied to single-glazed windows to mimic double-glazing effects.
• Pros: Cheap (under £20 per window), DIY-friendly.
• Limitations: Less durable than permanent glazing solutions.

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Medium-Cost Glazing Upgrades

Secondary Glazing

• Process: Install a separate pane inside existing windows.
• Performance: Reduces noise and heat loss, bridging the gap between single and double glazing.

Glass Replacement

• Options: Retrofit double-glazed units into existing frames if structurally sound.
• Cost: ~£250–£500 per window (depending on size).
• Policy Note: New glazing must meet Building Regulations (U-value ≤1.4 W/m²K or Window Energy Rating B).

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High-Impact Replacements

Energy-Efficient Doors

• Features: Insulated cores, thermal breaks, and airtight seals.
• Cost: Over £1,000 per door when installed individually, but cheaper as part of a bundled window-door upgrade.
• Benefits: Enhances security, noise reduction, and fire safety alongside energy savings.

Triple Glazing

• Usage: Ideal for north-facing windows or extreme climates.
• Design: Three panes with argon gas and low-emissivity coatings reduce U-values to ~0.8 W/m²K.

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UK-Specific Considerations

• Regulations: Replaced windows/doors must comply with 2024 Building Regulations (U-value ≤1.4 W/m²K).
• Grants: Check local authority schemes for retrofit funding, though none are currently nationwide.
• Expert Tip: Combine window upgrades with door replacements for bulk discounts from installers.

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Common Mistakes to Avoid

1. Ignoring Frames: Heat escapes through frames as much as glass—prioritise insulated PVCu or timber.
2. Overlooking Ventilation: Draught-proofing must preserve airflow to prevent condensation.
3. DIY Errors: Poorly fitted weatherstripping or films can worsen performance.

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Final Recommendations

For most UK properties, start with draught-proofing and films for immediate gains, then consider glazing upgrades. For doors, prioritise replacements if older than 15 years or visibly damaged. Always use TrustMark-registered installers to ensure compliance.