the design prepared for you is a very clean and modern, yet lakeside/mountain home approach. The basement and ground floor are connected via a spiral staircase.
The gym is the main area in the lower level an overlooks the terrace which generously opens itself fully to the surroundings.
Slate flooring and a whitewashed wood for the structure will beautifully merge the newly built part with the main house and yet leave it as distinct and new.
The renderings supplied are only to give you an idea of the structure of the build out and the detailing that should be used.
All details can be further developed and explained if selected.
Shortage of time leaves the entry very schematic, yet I would be very happy to further explain the design.