Is a by-law requried to move pipes in a laundry renovation?

We are renovating our internal laundry with new cupboards and storage. However,  some pipes need to be moved along the wall to accommodate the relocation of the laundry sink.

Our strata manager is telling us we need a special by-law to cover this in addition to a “scope of work” and plumbers diagram.

Any advice on whether this is correct?

Thanks