They do not guarantee work!! Avoid at all costs!!
They replaced glass in fireplace door which cracked right down centre within 5 minutes of use (lucky no one was hurt!). Clear that screws over-tightened or glass not tempered properly. Called to explain situation and Paul (owner) responded "Yeah (pause), what do you want me to do about it?". Arranged to bring door back in following day and was met by Paul's wife who said "This is not my problem." They refused to replace glass at no cost or provide refund.
Took door to another company in Burlington who will do work for nearly half as much. In calling around to find another company, we discovered Grainger Glass has a poor reputation in the industry, so we will never do any business with them again.