Is it possible not to enter the SRO? Can! But then you have to forget about the possibility of providing construction services. Any other permissions of the license issued not SROs are considered invalid and activities that are carried out on the basis of these documents are also illegal. Only, having passed the registration process in SRO, and having received the necessary package of documents and permits, the enterprise can engage in its design, construction, etc. D. Yes, all this is paperwork, but without it, unfortunately.