Poor workmanship, Abandoned Project, unqualified construction work.
Based on our experience, avoid this contractor. We had a bathroom remodel that took several months and he didn't even finish the project - he just abandoned us. Shower was installed incorrectly and has leaked through our ceiling, windows installed incorrectly and left incompleted prior to winter, are just the beginning of the numerous deficiencies left.
Regret paying him half of the project before he disappeared and never returned. Use homestars and avoid my mistake.