Specify replacement windows for a rental property

Check constraints before ordering

• Review listed-building, conservation, planning and lease restrictions.
• Identify any required escape opening or fall-protection arrangement.
• Confirm the correct approval or certification route with the relevant body.

Coordinate performance

• Specify suitable glazing, opening, ventilation, weather resistance and security.
• Consider how improved airtightness affects moisture and extract ventilation.
• Check restrictors and locks do not undermine required escape.

Inspect and hand over

• Test opening and closing, seals, safety devices and any vents.
• Obtain the required compliance documents and warranties.
• Explain use and report any defect promptly rather than relying only on the installer's guarantee.

Ask for a written ventilation and handover specification

For England, the Approved Document F questions explain why a disclaimer is not a substitute for complying with the ventilation requirements. Wales and Scotland require their own applicable guidance.

• Ask the designer or installer how the replacement affects background ventilation, purge ventilation and existing mechanical systems. Record the basis for keeping or changing vents rather than accepting 'the old window had none' as the answer.
• List each room, opening arrangement and any escape or safety requirement in the quote. Resolve conflicts between a restrictor, security lock and required escape function before manufacture.
• At handover, obtain the country-appropriate compliance evidence and operating instructions. Check that installed vents work and that occupants can operate any required escape opening.

Related guides

• Check asbestos before disturbing building materials
• Find and fix the cause of damp and mould
• Check Welsh building approval before conversions
• Separate Welsh fire design from building safety duties
• Get the right building control approval in England
• Identify the higher-risk building route in England