Reverse charge reg

one of my client doing works contract (construction contract) and he is paying service tax @ 4.944% and in addition he is giving sub contact for plumbing , eletrical and painting. Is the reverse tax will applicable for this sub contract too? plumbing contract includes material with labour and eletrical and painting only labour contract. my client is pvt ltd company and the sub contractor is partnership firm. pls advise me the applicability of reverse tax. Regards Jeffry FCA