Summary
Adding brush seals to doors and windows, alongside foam strips, sealants, or draught excluders around frames, letterboxes, and thresholds, to ensure proper draught proofing and reduce infiltration.
Cost/difficulty
LOW COST
LOW DIFFICULTY – These measures can be installed by a homeowner with competent DIY skills.
Applicability in Letchworth
Applicable – No specific requirements.
Insights from ASBP
“Use low-VOC sealants and foam strips to minimise indoor air pollutants. Brush seals made from recycled or natural fibres can help reduce the use of plastics.”
Insights from People Powered Retrofit
“Basic draught-proofing measures are a low cost but important first step for any retrofit project, helping to make your home more comfortable and reduce heat loss.”
Case study
Crouch End sash window repair and draught proofing
A blog post from London Sash Window Repairs.
Links to further information
- Energy Efficiency Guide for Letchworth Garden City residents (2024), page 8
- The Surrey Home Energy Improvement Guide (2025), page 38
- HCCSP Retrofitting Your House Guide (2024), page 24
- Retrofitting Your Home – Cambridge Guide (2022), page 10
- Energy Efficiency and Historic Buildings (2016), page 13
- DIY draught-proofing (2022)
Image credits – Stormguard; London Sash Window Repairs.
This guidance is part of Draught proofing
See more guidance notes on this topic below: