Local take from Mission Viejo, California: separate the monthly budget from the arrival budget. The monthly budget has housing, cars, childcare, utilities, insurance, and activities. The arrival budget has deposits, furniture, movers, repairs, hotel nights, and all the annoying things nobody posts on Instagram. In Irvine, HOA rules and car-dependent family routines are the two categories I would not underestimate. A move can still be financially smart and still feel expensive during the first six months.