Dear Mr. Bijay,
There are now more points (queries) beyond the CLA issues. Earlier, you asked only about the applicability of a Labour Licence, but now Statutory Benefits, TDS, and Service Tax are also included in the discussion.
Umakanth sir has clarified the terms related to CLA. In Maharashtra, as per a recent notification, there should be a minimum of 50 workmen required to come under the Labour Licence context. If your deployment at a single site reaches the minimum number, then only do you need to obtain a Labour Licence.
I would like to add a few more points (which can be practically useful for you), for which I need more details, such as your organization's status (Proprietorship, Partnership, Company). What terms and conditions are mentioned in your Agreement (related to statutory, taxation, payment terms, etc.)? Does the Housing Society have any source of regular earnings, or is it being operated/maintained under/by any profitable group? Because the way they are handling Service Tax and TDS, it seems they are working on a large scale. Generally, Co-operative societies don’t want to involve themselves in such things. Moreover, you have not clarified whether the society is ready to provide you with PF-ESI and other mandatory benefits.
First of all, you can approach the labour office in your area, duly mentioning the case history. If the Labour Office issues you any clarification/NOC that the Housing Society does not come under the purview of CLA, then you can exclude those employees from the statutory compliances.
However, if the society is ready to provide you with the benefits in your monthly rates, you should not have any problem. If the client delays your payments, then you have to maintain the backlog of paying the salary and statutory liability.
Regarding TDS, you are right; the TDS should be deducted only on basic prices. Service Tax should be excluded while deducting TDS. If you are a non-company, then Service Tax is applicable under the reverse charge mechanism. Under the reverse charge mechanism, the liability of depositing the service tax lies with the Service Recipient. You have to submit/share your service tax number with them. However, you have to mention the clause in your invoices. If you are a company, then they must pay you the Service Tax.
I hope the points are now clear. However, for a better framework, I advise consulting a professional on these matters.