Once you have several quotes, you can compare the costs to help guide your budget planning. According to the 2015/16 HIA Kitchen and Bathrooms survey, the average cost of a complete bathroom renovation in 2015 was on average $17,779.
choose which parent to live with - at age 16 a young person can usually decide which parent to live with if their parents are separated, and decide whether/when to visit the other parent; choose to leave home - at age 16 a young person can leave home without their parents' consent
Typically 8 year olds and over can be left at home for up to several hours (usually after school before a parent gets home from work). 12 years old appears to be the most common recommendation. See the Home Alone Children Legal Age Limits link below for recommendations and a listing of a state by state comparison.