Whether you need planning permission really depends on the type of building and whether you are matching existing look of the windows. Grade 1 and grade 2 listed buildings sometimes do need counsel approvals for changing sash windows. A simple renovation job should not require permissions as long as you are restoring sympathetically. Approvals are normally required when you are changing the look silly isn’t befitting the area. We can help guide you in the process to ensure that you do have all of the approvals required to get your sash window project completed.