Begin with the condition, not the age
Age is one piece of context. Look at how the window operates, whether the frame is sound, where moisture appears and what you want to improve. A sticking handle, a failed glass unit and deterioration around an opening are different problems.
When a targeted repair may be worth assessing
Hardware or weatherstripping may be replaceable when compatible parts are available and the frame and sash remain suitable. A technician needs to identify the component and check whether another issue is causing the symptom.
When glass-unit replacement may be an option
Persistent moisture between sealed panes can warrant assessment of the insulated glass unit. If the surrounding window remains suitable, replacing the glazing may be an option to compare with complete replacement.
When a broader replacement assessment is useful
Frame deterioration, repeated operating problems, major damage or a change in the intended opening can justify a whole-window assessment. Confirm the removal method, finishing responsibilities and treatment of any damage found during work.
Compare the same scope
Ask what is being supplied, which components stay, what finishing is included and who handles disposal. Compare product specifications and written terms; a headline price alone does not describe the work.
| Situation | Useful next question |
|---|---|
| Difficult operation | Is the cause hardware, alignment or the frame? |
| Moisture between panes | Is the insulated glass unit affected, and is the surrounding window suitable? |
| Drafts or water entry | Where is the path, and what building components are involved? |
| A new size or opening | What design, structural and permit work is required? |
This guide is a starting point for an enquiry. The cause and appropriate work require assessment of the actual window and site.