Service tax on construction services

My client is Builder,developing own land and construct Resiential Flat in Gujarat. I need to have Formet of Lagal Drafting for sale of Flat in order to avoid Service tax.

Dear sir/s, We are in the feild of Aluminium Doors, Windows,Partitions, Glazing, Cladding etc.. Mostly we are doing this activity for Residential, Commercial, Hotels, Hospital projects as per their requirement and specifications. At present we are charging 2% service tax on our total bill value to our client. So we would like to know that is this activity under service tax or excise? Can you guide us with the clarifications? Thanks.

Kindly send a copy of agreemnet to me to please