The cost of hot tub, spa, and sauna services can vary widely depending on the scope of the project and location. Nationwide, hot tub installation typically costs between $3,000 and $16,000 depending on the size, material, and features. Spa repair services usually range from $150 to $600, while sauna installation costs typically fall between $3,000 and $5,000 for an indoor unit and $5,000 to $25,000 for a custom-built outdoor sauna. Smaller repairs, such as fixing jets or replacing heating elements, may cost anywhere between $100 and $1,000 depending on the complexity. It's always a good idea to get multiple quotes and ask about potential hidden costs to better understand your total investment.