Agreement between an owner and an architect for construction of a building

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On a quick perusal, one has two important suggestions to offer, for consideration: 1. It is advisable to ensure that the 'architects' -employed is a 'registered firm'. If not, the employer,to protect self against all probable, foreseen otherwise,contingensies,should have suitable stipulations/recitals included, so as to be in a position to legally enforece anyone or more of the obligations undertaken by the employee, in the event of its failure to fulfil. 2. To suitably cover, specifically and clearly, the aspect of the burden/incidence of 'service tax' liability.