Their lawyer, Jeremy Browne, this week filed an appeal in the High Court in Whangarei, seeking orders that Judge de Ridder's judgment and his decision to allow the regional council to join court proceedings be set aside.
They are also seeking costs in the High Court and the district court.
Mr Browne spelled out a number of grounds for the appeal. He said by allowing the regional council to join proceedings just 11 days before the start of the trial prejudiced his clients by denying them an opportunity to analyse the legality of the regional council's rates for the rating years in question. The district court failed to appreciate that a valid rates' assessment notice was needed to trigger rates' liability and a valid rates' invoice the obligation to pay.
Mr Brown said the court erred in interpreting the Local Government Rating Act as only allowing challenges to be made in the High Court and on limited grounds.
The Rogans are among about 100 defaulting ratepayers who owe nearly $1 million in rates and penalties from 2012 in protest against Parliament passing the Kaipara Validation Act. The act retrospectively validated irregularities in the setting and assessing of Kaipara district rates from the 2006/07 financial year to 2011/12 in respect of the Mangawhai wastewater scheme.