The cost also involves brand and non-brand, different brands use different materials, the price will be different, the approximate algorithm is like this: first calculate the aluminum consumption of 1.5*1.5 standard window, divided by 2.25 to get a square weight. Multiply the weight by the price of aluminum to get a square cost of aluminum! Total price of a square window = above aluminum cost + accessories (glue, crescent lock, pulley, secondary gear, etc.) + glass + service matching fee + perso......