End-of-warranty window inspections: safeguarding comfort, compliance and cost 

Windows are critical to building performance. They influence energy efficiency, acoustic comfort, air-tightness and resident satisfaction. As warranty periods approach expiry, it is essential to confirm that installed windows meet the required standards. 

GSIM provides comprehensive end-of-warranty tests for building windows, helping clients identify issues while they are still covered by warranty. 

Why end-of-warranty window tests matter 

Before a warranty expires, detailed inspections offer several benefits: 

• Peace of mind – independent assessments confirm that windows are performing as intended, giving owners and residents confidence. 
• Early detection of issues – discovering problems before the warranty ends enables timely remedial work by the original supplier or contractor. 
• Enhanced performance – checking seals, hardware, ventilation and operation can extend window life and improve comfort. 
• Seamless transition to maintenance – test results provide a solid baseline for ongoing planned maintenance programmes. 
• Long-term cost savings – preventing failures, improving durability and ensuring compliance reduces lifecycle costs and supports asset value. 

What GSIM’s end-of-warranty service includes 

Our specialists carry out: 

• Physical inspections and functional tests of window units 
• Checks on operation, seals, fixings and visual condition 
• Documentation of defects and non-conformances 
• Clear reporting for discussion with window suppliers or contractors 
• Recommendations for remedial works and follow-on Planned Preventive Maintenance (PPM) contracts 

By scheduling end-of-warranty tests with GSIM, building owners can safeguard their investment, protect residents and avoid unexpected costs after warranty expiry.