Indoor staircases are a very extensive category. They include many types of stairs. What they have in common is that they are installed inside a building. Indoor staircases can be both wooden and metal. Depending on the type of stairs, their installation can be relatively easy and quick or very complex and time consuming. This is because indoor straight stairs do not require taking various measurements or a lengthy installation, while indoor winder or spiral stairs require taking numerous measurements and supervision at each stage of installation.