- Changes to facades, roofs, window frames and windows
- Structural interventions, such as a wall opening or a new stair opening
- Insulating or fitting different glazing
- Removing or changing historic interior features, such as fireplaces, staircases or ceilings
- Painting in a different colour
Ordinary maintenance is usually permit-free: work that preserves what is there without changing material, shape, detailing or colour. In Amsterdam this only applies if consultation with the heritage adviser shows that the structure and historic features are not altered. Permit-free work on a monument in Amsterdam (in Dutch)