A threshold is the bottom section of frame on a door. A standard threshold basically means that the bottom section of frame will match the rest of the outer frame. This will usually create a raised step, therefore, it’s worth speaking with your installer to establish how the door will be installed to ensure the step is set down below the floor.

In order to comply with Part M of the building regulations, on most new builds, you will need to specify a low part M compliant aluminium threshold.