Use the condition of the whole window, not its age alone, to decide what needs attention.
How long does double glazing last is a useful starting question, but a window does not become one single worn-out item on a particular birthday. The sealed glass unit, frame, opening hardware and seals can develop different faults. Understanding which part has changed helps you avoid treating a repairable problem as a reason to replace the complete assembly.
Age provides context, while symptoms provide a better brief for an assessment. Note what you can see and how the window operates: mist between panes, moisture on the room side, a catching sash and a damaged frame point to different questions. This guide explains how to approach that decision without diagnosing a window from age alone.
Our double glazing service page states: Quality double glazing typically lasts 20–25 years or more with proper care. That is general guidance rather than a promise that every part of every window will remain unchanged for that period. The present condition still needs to be checked before deciding what work is worthwhile.
Keep the installation details and care instructions if you have them. They help establish what is fitted and how it should be maintained, but missing paperwork does not itself prove that replacement is necessary. Describe the actual problem and which windows are affected rather than using an assumed installation date as the whole diagnosis.
Cloudiness trapped between panes is different from condensation that can be wiped from the room-side surface. The first points to a sealed-unit issue; surface moisture needs consideration of the conditions around the window. Record where the moisture appears and whether it can be wiped away before describing the fault in an enquiry.
Our misted double glazing service explains replacing a misted sealed unit while retaining a suitable existing frame. That is a different decision from changing the whole window. The frame and surrounding condition should still be assessed, so the repair proposal addresses the affected component rather than simply treating all moisture as the same problem.
A handle that is difficult to turn or a sash that catches does not by itself tell you the glass or frame has reached the end of its useful life. Note when the problem occurs and whether the opening closes properly. Avoid forcing an awkward mechanism; have the fault assessed instead of assuming harder pressure is the answer.
The window handle and hinge repairs service covers hardware faults that can often be repaired. Check the locking and seals as part of the same discussion. A repair should address the identified cause, while broader damage or compatibility issues may change which options are appropriate.
How long do uPVC windows last is really a question about a complete assembly in a particular property. Look at the frame, opening sections and glass separately. A window that still operates properly presents a different case from one with several recurring faults, even if their installation dates are similar.
Follow the product care instructions for cleaning and maintenance, and raise changes in operation before they become harder to manage. At an assessment, ask what can be retained and why. The useful comparison is between a defined repair and a defined replacement, not between a general material label and an assumed lifespan.
When asking how long do composite doors last, assess the leaf, frame, seals, hinges and locking as connected but separate parts. Difficulty closing a door is not the same symptom as damage to the panel. Our composite doors page covers the product service; explain the current condition rather than choosing a replacement solely because of age.
When to replace windows depends on the faults found and the outcome you want. Compare the scope of a repair with the glazing, operation and finish of a proposed replacement. Request a written quote that identifies retained parts and new work. That gives you a clearer decision than a whole-house replacement based only on one misted pane or a calendar estimate.
Arrange a free home survey through our double glazing service and request a written quote based on the condition of your windows.
The condition of the frames, sealed units, seals and hardware matters more than age alone. Assess each part and compare a defined repair with replacement before deciding whether the complete window needs changing.
Check the door leaf, frame, seals and hardware, and follow the product care guidance. Age alone does not establish whether the door needs replacement; describe damage or operating faults for an assessment.
Consider replacement when the assessment shows that repairs would not adequately address the faults or your requirements. Ask what can be retained and compare the complete repair and replacement proposals.
Not necessarily. A misted sealed unit can be replaced while retaining a suitable frame. The condition of the frame and the cause of any other faults should be assessed before choosing the work.