Hello All, we have a Rijskmonument house in Zierikzee ( I can provide the number of the monument if that helps ). The image below is the front of the house where we want to do the following works : repair if needed the wooden window and door frames of the ground floor without any changes to the aspect, shape or profiles. Clean and repaint the facade in the same colour as existing. Remove the single glass 5mm for the ground floor 2 big windows ( in total 12 panels ) and replace that with Fineo vacuum glass - 8mm thickness. For the entry door which has a glass panels above with an organic pattern - we will not change that window but install a glass panel from Fineo on the inside of the door, also to maximize the energy efficiency. Overall, for the big windows the glass will be installed in the same frame with the same appearance as before. For the work we obtained a quote from a reputable company from Zierikzee specialised in heritage restauration with very good work. In practical terms , what we want is to increase the thermal performance for the ground floor windows, repair if needed the wood frames ( work done by the contractor ) and paint the element that are painted in the same colour. The work will not change at all the appearance of the house. The questions we have are : given that employed a specialist that works on monument and that we are not changing at all the appearance of the house ( except installing new glass ) , Do we need a building permit ? If not where can we get a definitive answer that will provide us piece of mind for the future? If we need building permit , what are the steps to obtain one for a monument building like this ? Looking forward to answers on the topics above ! Many thanks and a beautiful day to everyone ! Kind regards, Florin