Do you need to an urban development permit? You can find all the information on urban development stipulations in the Brussels-Capital Region on the Homegrade Brussels website.
You can also read through the Regional Urban Development Regulations (RRU) on the Brussels Urban Development website. These regulations are a collection of general rules and conditions for spatial planning in the Brussels-Capital Region. For example, the RRU contains rules for putting up advertising billboards, the insulation of buildings, accessibility for people with a handicap, and the characteristics of buildings and their surroundings.