Dark colours tend to shrink the room a bit. It brings the walls in, especially in spacious rooms. However, you will quickly become used to it and it’s not nearly as impactful as you first think. Try starting with the longest wall first or maybe just start with an alcove to ease into the change a bit. But it’s important to remember that with the right style, like dark and contemporary, dark walls work in any room. If you’re really worried about the room shrinking, you can counter it with the use of mirrors. Strategically placed mirrors can add a massive sense of space, and they reflect light too which really helps. Similarly, a gloss paint, because of its reflective finish, has a similar effect.