The short answer
The short answer
A lock that will not latch may reflect hardware damage, incomplete closure, sash alignment, frame movement, or obstruction. Do not force it or assume the lock alone is the cause; secure the area appropriately and arrange prompt assessment when security or child safety is affected.
Next-step priority: Prompt Assessment.
Observable signs
- The latch and keeper do not align.
- The window does not close fully before locking.
- Hardware is loose, damaged, or missing.
Possible explanations
- Latch or keeper condition
- Sash not fully closed
- Frame or sash misalignment
- Debris, paint, or damaged seals
Safe checks
- Use only normal closing and latching motion.
- Note whether the sash sits evenly and closes fully.
- Limit access to the opening until security and child-safety concerns are addressed.
What not to attempt
- Do not force or modify the latch.
- Do not drill into the frame without product and installation information.
- Do not rely on an improvised lock where fall or security risk exists.
Repair and replacement signals
Signals to discuss for repair
- Compatible latch, keeper, adjustment, or service restores safe operation and the frame remains suitable.
Signals to discuss for replacement
- Frame or sash distortion prevents safe closure and compatible repair is unsuitable.
- The assembly has broader deterioration or security problems.
What a professional may check
- Closure and alignment
- Latch and keeper
- Frame and sash condition
- Safety and security needs
Sources
Sources
- Window Types and Technologies — U.S. Department of Energy
- Window Installation — U.S. Department of Energy