UPS installment - Rawalpindi

there are a lot of electricians and mechanics who know how to install UPS but they Don't  know about UPS i m graduate B TECH and part time i install UPS in houses  with proper techniques and no doubt the charges are reliable i think a simple electrician require 2 to 3 thousand for the installment of ups in single story but my charges are only 2500 for 4 rooms or single story and for double story only 4000