What does practical completion mean?

Practical completion in relation to the installation of windows, doors, and conservatories refers to the stage at which the work has been finished to a standard where it can be used for its intended purpose, even if some minor defects or finishing touches still remain.

At this point, the installation should be secure, weather-tight, and fully functional, ensuring that the property can be occupied and protected as expected. Any outstanding issues should be small, non-structural items, such as cosmetic adjustments, sealant finishes, or minor fittings that do not prevent the windows, doors, or conservatory from performing their essential role.