Finished floor levels are mostly a matter of personal preference but there are some things to consider.
You may require the frame of your window/door to be sunk beneath the level of your finished floor in order to reduce the ‘step’ over a threshold, to allow for an inward opening door to not catch the flooring when it is opened into the property, or just because you prefer the look.
Your finished floor level is usually made up of a layer of screed, with your carpet/floor tiles etc. laid on top.
Finished floor levels are usually decided by your designer/architect and we can make our frame sizes to suit these details.
If you are replacing existing doors, it will be useful to know how far above the structural opening (the brick/block which your door sits on) the finished floor level is. This allows us to make sure your internal threshold isn’t lower than your finished floor level.