@VicRes said:
“…documentation from the installer that it does comply with the by-law.”
This could be a statement from the installer that “the work complies with ABC building codes” Nothing more. Effectively meaningless, as the ABC codes are (as I understand) non-binding suggestions of good practice. And mostly refer to build-time design rather than renovation. They don’t say much about replacing carpet with timber flooring.
What would work for me would be
“We propose to use 12mm Dunlop AcoustiCushion sound insulation underlay under the timber flooring”
or
“We propose to use 10mm Regupol 6010 sound insulation underlay under the timber flooring”
Or similar.
Why would this not work, one wonders?