No Lady K it is not. There has to be a sound reason, i.e. refusal to grant approval has to be reasonable.
The SSMA does not limit your rights in the way described by Robert – for example, if an OC refused approval for an internal renovation on the basis that, “we don’t like it”, that is not a sound reason, and the refusal can be challenged.
It sounds like you have provided all that is necessary, so if I were you I would proceed to adjudication.