A strict reading would suggest that even an innocuous internal renovation requires an unopposed resolution of a general meeting. If this applies, you would need to put a motion to a general meeting and hope that nobody opposes. However, this is one of the default rules that may be amended by an owners corporation (OC) (Some of the default rules may not be amended).
Many OCs amend this rule to authorise the executive committee (EC) to approve some sorts of more minor unit alterations or all sorts of unit alterations or to only require a simple majority general meeting resolution rather than unopposed. I suggest you check with your EC or strata manager to find out whether your OC has amended the default rule or has adopted an additional rule about internal alterations.