I'm not able to lock my sash window, what do I do?

I’m not able to lock my sash window, what do I do?

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Please check that the top sash has an even gap all along the top and the bottom sash has an even gap along the bottom. If you have bigger gaps at the end on either the top or bottom sashes, your head or sill could be bowed. This will stop your sashes from going as far as they should, and your window won’t lock. If you have a gap at the corners, your frame is likely fitted out of square, and this can stop your window locking.

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