Sauna installation: what to know

What the job involves, what changes the price, and what to ask a pro.

What sauna installation is

Sauna installation builds or assembles an indoor or outdoor sauna with insulated walls, benches, a heater and controls, a dedicated electrical circuit, and proper ventilation with clearance from combustible materials. Owners hire it when they want the heat and layout right the first time and the electrical work done to local rules.

Signs you need it

  • You want a sauna in a basement, garage, bathroom or backyard, and the space has no heat source yet
  • The room is damp, drafty or poorly insulated and needs a proper vapor barrier
  • The old sauna heater or controls have failed and need full replacement
  • The sauna needs a new dedicated circuit or a relocated control panel
  • You want a sauna kit assembled, leveled, and the benches and vents placed correctly

What the pro does

  • Check the room for size, ceiling height, ventilation paths and clearance from walls, glass and combustibles
  • Frame and insulate the walls and ceiling, then install the vapor barrier on the warm side of the insulation
  • Set the benches, backrests and heater guard to the sizes the heater needs
  • Install the electric heater and control, with the temperature sensor placed as the manufacturer directs
  • Run the dedicated circuit and protection through a licensed electrician, and bring the control wiring to the wall
  • Test the heater, the temperature sensor and the door latch, then run a full heat-up and check the ventilation

What changes the price

Every job is different, so we do not publish prices. These are the things that move the quote up or down.

  • Sauna type, such as a prefabricated kit, a custom build or an outdoor unit
  • Room size, height, and how many benches are needed for the seating area
  • Insulation, vapor barrier and framing work needed in the room
  • Heater size and type, and the electrical service it requires
  • Distance from the electrical panel, and any new circuit or panel upgrade
  • Ventilation work, including intake and exhaust vents placed to the design
  • Glass, lighting, door and window choices, and the finish on benches and walls

What a written quote should spell out

  • Sauna size, bench layout, wall and ceiling materials, and the door type
  • Heater make, model, power rating and the control unit
  • Electrical work listed separately for the licensed electrician, with the circuit named
  • Insulation, vapor barrier and ventilation as separate lines
  • Clearance measurements from the heater, benches and walls, shown on the plan
  • Warranty on the heater, the controls and the labor, and who handles claims

Questions to ask before you hire

  • What heater do you recommend for this room size, and what clearance does it need?
  • Who runs the dedicated circuit, and will a licensed electrician do it?
  • How do you handle the vapor barrier and the insulation?
  • Where do the ventilation vents go, and how do you check the airflow?
  • Are the benches and the heater guard spaced to the heater manual?
  • What warranty covers the heater and the controls?
  • What happens if the room has a combustible wall too close to the heater?

Red flags

  • They place the heater too close to the benches, walls or combustible materials
  • They skip the ventilation plan or leave the vents out
  • They leave the electrical circuit to the homeowner or an unlicensed helper
  • They build the walls without a vapor barrier in a damp room
  • They cannot show the heater's clearance requirements from the manual

What you can do yourself

A homeowner can plan the layout, choose the wood or bench finish, and clear the room before the crew arrives. Do not run power, install the heater, or connect the control wiring yourself, because sauna heaters are live electrical equipment and need a licensed electrician. Do not place any heater or wall near combustible materials, and call a pro for every electrical, heater and ventilation step.

Licenses and permits

Sauna installation often requires a licensed electrician for the dedicated circuit and controls, and a permit is often needed when the electrical or structural work changes. Check with your state or local licensing agency and your local building office for the rules that apply to your project.

Sauna installation questions

Can I put a sauna in a bathroom?

It depends on the room's size, its ventilation, its moisture levels, the heater type and the electrical service. Ask the pro to check the clearance, the vents and the circuit before you commit to the location.

Do I need a special circuit for a sauna heater?

Most sauna heaters need a dedicated circuit with protection. The electrician will confirm the circuit size and protection that the heater's manual requires.

What is the difference between a traditional and an infrared sauna?

A traditional sauna heats the air with a stove or electric heater, and water on the stones adds humidity. An infrared sauna heats the body with infrared panels at a lower air temperature. Ask the pro which type fits your room, your power supply and how you plan to use it.

About this guide

This national guide is written and checked by infinibell. Rules and conditions differ by place, so local pros are credited on guides for the cities they serve, not on national ones.

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