Soundproof booth

As a music producer and composer, I am looking to have a soundproof booth built to accommodate a recording studio that I will use for both professional and personal music production. The soundproof booth needs to be a small size, able to accommodate 1 to 2 people, and require a professional level of sound isolation that is virtually soundproof. I want only the highest quality construction materials with the most advanced soundproofing techniques and products available, and will pay accordingly. The booth needs to be completed in a reasonable amount of time and should have acoustically effective doors, walls and other structures to ensure a quiet recording atmosphere. I am looking for contractors with experience in building soundproof booths, as all work should meet or exceed industry standards for soundproofing and acoustic performance.