Garage+Loft Addition: Vehicle & Boat Storage

I'm in need of a skilled contractor to construct an addition to my current garage, with space to accommodate one vehicle and one boat on the lower level. Above this, I'd like a second floor to be constructed primarily for use as a recreational area. Key competencies include construction, property renovation, and interior design. Prospective freelancers should have a proven record in delivering similar projects. Knowledge of the following are desirable:
- Vehicle and boat storage design considerations
- Construction safety measures for multi-level buildings
- Recreational space design and layout.