Nicola Stables says a move that would require holiday homeowners like herself to obtain a resource consent to rent their properties out to six or more people could result in visitors going elsewhere for their holidays.
Ms Stables says her Te Kouma chalet, which can sleep up to 10 people, is usually booked out between mid-December and the end of January.
The chalet, about 5km south of Coromandel, has two bedrooms and a toilet upstairs, a bedroom downstairs, an open plan kitchen, dining and living area and a deck complete with barbecue.
It's a five-minute walk to a nearby beach and a two-minute drive to a boat ramp.
Ms Stables, who lives in Huntly and bought the property as an investment with her husband in 2006, said that outside the busy periods of the year, bookings were sporadic.