"It was quite unusual when I saw it but they have no problems."
The 90sq m house, which sits on a half share of an 890sq m cross-lease section, has a capital valuation of $290,000 and Ms Liu predicted it would fetch close to $400,000 at auction on July 26.
The listing comes less than three weeks after the Herald flushed out a toilet-in-kitchen studio, and a room with a "summer kitchen" - a crude outside bench with a tin sink and single tap - both available for rent on the North Shore.
The kitchen studio was a furnished bedroom in Anthony Wong and Anita Leung's family home where the en suite also featured a washing machine, fridge, microwave and portable hotplates, directly opposite the toilet - a hygiene hazard.
Auckland Council's building control inspections manager, Tim Weight, said a wall-less en suite was not against the rules.
It could comply with the Building Code depending on whether any additional ventilation had been put in place. The council's compliance team would now investigate.
Registered Master Builders Association chief executive Warwick Quinn said wall-less en suites were "considered very European".
Real Estate Institute chief executive Helen O'Sullivan said she had not seen that presentation of bathroom and bedroom before.
While there was no law requiring a bathroom to be curtained off, "modesty usually suggested it".