(4) Če se vlaga pritožba ali predlaga obnova postopka iz razloga, ker pritožniku ni bila dana možnost udeležbe v postopku kot stranskemu udeležencu, ker takšna oseba meni, da je predvidena gradnja v nasprotju z izvedbenim prostorskim aktom, je treba pritožbi oziroma predlogu za obnovo postopka najpozneje v 15 dneh po vloženi vlogi pristojnemu upravnemu organu za gradbene zadeve predložiti ekspertno mnenje, iz katerega izhaja, da je predvidena gradnja v nasprotju z izvedbenim prostorskim aktom. Takšno mnenje lahko izdela pravna ali fizična oseba, ki izpolnjuje pogoje za prostorskega načrtovalca.
If an appeal is lodged or a repeat procedure is proposed on the grounds that the appellant was given no opportunity to be involved in the procedure as a secondary participant because such person believes that the envisaged construction contravenes the implementing planning document, within fifteen days of the applications being lodged with the relevant administrative body for construction matters it shall be necessary to produce an expert opinion for the appeal or proposal for a repeat procedure from which it proceeds that the envisaged construction contravenes the implementing planning document. Such an opinion may be formulated by a legal or natural person that fulfils the conditions for a planner.