To you and others, inform me your reno size and what reno you want to do, i will calculate for you.

TQ
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Today, i decided to give one of many more tips for house owner, for me i would plaster first, then install water piping and wiring later after plaster. That mean you have to cut the wall. This step, many contractor do not want to do this cause for them is messy. PM me if you want to know why?...
A good main contractor should do this. This is one indicator that if he/she is good and experience contractor.