Help with interior design of loft extension and fitness studio

Looking for someone to assist with interior design in 4 rooms: Loft bedroom, loft office, loft en suite, fitness studio in main bedroom of Victorian semi. The extension is starting 3rd week of February and will be finished 2nd weekend of March approx. I have the technical drawings for the loft extension (they include dimensions of main bedroom as well) if needed. We have some ideas of what we like/don't like and are not looking for full inspiration etc, just a little push to grow some ideas for the finishing of the conversion and relocation of the fitness studio