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The building design that you are describing does not appear to have much density of material or insulation between the noisy pipe and the complainant. Heavy materials like concrete tend to be the best materials for sound insulation.
Interior walls that have layers of plasterboard with sound control material in the cavity can be very effective in reducing sound.
Has anyone with a similarly located Lot i.e. one that abuts the pipe work, complained about this in the past? Perhaps it is a new problem? The lower Lots in a building would probably have greater issues than higher Lots.
If I was you I would first seek the advice of a plumber.
Then …. If there is not a plumbing problem perhaps your Committee can (1) Suggest that the complainant move their bed to another wall if possible; or (2) Have the Committee discuss with the complainant the feasibility and acceptability of the installation of an extra sound barrier on the inside of the common property wall. Perhaps both the OC and the complainant can share the cost?
NCAT decisions pertaining to Strata Schemes are often searched for in the pre purchase due diligence. If nothing is done about this issue and it ends up becoming rancorous through NCAT it may draw unfavourable attention to this “defect” and dissuade potential purchasers from buying in your building. Is this something that your OC would be prepared to accept?