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Beside all the ERSS as mentioned, you should be aware of strutting works needed to prevent your neighbor's house from collapsing on your plot. Double if yours is a terrace house as strutting needed of both left & right neighbor. Important to note on waterproofing issues in your neighbor/s related to the aforementioned strutting. This means you have to be aware of third parties' liabilities within the Contractor's All Risk Insurance Policy which your builder must procure before construction commencement. Overall, the ERSS, Strutting & the separate ERSS Qualified Registered Professional Engineer will be upwards of 225K. This is not including the actual concrete, steel, etc to form your basement. Also, depending on your project Professional Engineer's (not the ERSS PE which means you'll need 2 PE for the job) structural design of the foundation (ie: Pile Cap or Footing), added ERSS is needed for the foundation's pile cap or footing. Finally, there is regulation / requirements to the draining of underground water during excavation. Just thought you should be know.