Most of our interior doors are made of oak or ash We oil the oak and the ash is often painted white. We also build some interior doors in walnut, which is a very beautiful type of wood. See photos for inspiration on interiors.
If the interior is to be the same type of wood or color straight through, we usually recommend that you let the interior doors contrast against the rest of the interior. For example, it is common to have oak floors at home. If you also have, for example, stairs and furniture in oak, it can be too much with even interior doors in oak. It can be nice to pick another type of wood We think it's nice with contrasts! If all the interior is all white, it can be nice with a wooden door.