# Questions to Ask a Sauna, Steam Room or Cold Plunge Installer A checklist of questions to ask before you hire an installer for a home sauna, steam room or cold plunge, with the reason behind each question. Updated 2026-10-29. Also on the [web page](https://privatewellnessrooms.fyi/guides/questions-to-ask-a-sauna-steam-room-or-cold-plunge-installer). Ask these questions in the first meeting. Ask for the answers in writing. A good installer can answer each question and show a document to support the answer. ## About the firm 1. **Are you licensed and insured for this work?** HomeGuide includes this question in its lists for sauna and steam room pros. Ask for the licence number and check it with the issuing body. 2. **How many rooms of this type have you installed?** A steam room and a sauna need different skills. HomeGuide suggests that you ask for references or photos from recent projects. 3. **Which trades do you do yourself, and which do you subcontract?** Many projects need a carpenter, an electrician, a plumber and a tiler. 4. **Who is my main point of contact?** HomeGuide includes this question for steam room pros. ## About the quote 5. **Is the cost of the unit included in your installation quote?** HomeGuide lists this question for sauna installers. 6. **What is not included?** Ask about the base, the electrical circuit, a panel upgrade, ventilation, permits and delivery. Steam & Oak says that a quote for a cabin price alone does not cover the job. 7. **What is the timeline?** Ask when work starts and when it ends. Ask what can cause a delay. ## Saunas 8. **What size heater do you specify, and why?** HomeGuide says the heater size should be 1 kW for every 50 cubic feet of sauna room. Rooms on exterior walls and outdoor saunas may need larger heaters. 9. **What circuit will the heater need?** Sauna Heater Supply says most traditional electric heaters need a dedicated 240V circuit. It also describes the NEC 125% continuous-load rule for circuit sizing. 10. **Does the heater manual allow a GFCI or RCD on the heater circuit?** The Harvia KIP manual says the heater must not connect to a GFI breaker. Agree on the answer with your electrician before you buy the heater. 11. **How will you ventilate the room?** The Harvia KIP manual says the air in the sauna room should change six times per hour. 12. **What insulation and vapour barrier will you use?** The same manual specifies insulation of at least R11 and a paper-backed aluminium vapour barrier, with the aluminium side facing into the room. ## Steam rooms 13. **How will you waterproof the room?** Mr. Steam says you need a vapour barrier and/or waterproof material behind the surface material. 14. **How will you slope the ceiling?** Laticrete, citing the Tile Council of North America, says the ceiling must slope at least 2 inches per foot so that water does not drip on users. 15. **How high is the ceiling?** Mr. Steam says to limit the ceiling to 8 feet. A higher ceiling needs a larger generator. 16. **Who will connect the generator?** The Mr. Steam manual says only qualified, licensed electricians and plumbers must install it. It also calls for a separate circuit breaker and a disconnect. ## Cold plunges 17. **What circuit and outlet does this model need?** A Plunge manual says to plug the unit into a GFCI outlet, with a 15-amp breaker for the Standard model and a 20-amp breaker for the Pro/XL. It also says not to remove or bypass the GFCI. 18. **Where will the unit sit?** HomeGuide says most above-ground plunge pools need a concrete slab. It also says most cities require a barrier around pools that exceed a certain depth. 19. **What permits will the plunge need?** HomeGuide gives $500 to $2,000 for plunge pool building permits in the US. ## After handover 20. **What warranty do you give on your work and on the products?** HomeGuide includes this question in both lists. 21. **What maintenance will the room need?** Ask for a written schedule. 22. **Which documents will I get?** Ask for the manuals, the permit sign-off and any electrical certificate. Compare builders, dealers and installers near you in our directory, then take this list to each meeting. ## Sources - [HomeGuide: How much does a sauna cost?](https://homeguide.com/costs/sauna-cost) (fetched 2026-10-29) - [HomeGuide: How much does a steam room cost?](https://homeguide.com/costs/steam-room-cost) (fetched 2026-10-29) - [HomeGuide: How much does a plunge pool cost?](https://homeguide.com/costs/plunge-pool-cost) (fetched 2026-10-29) - [Steam & Oak: Sauna installation UK](https://www.steamandoak.co.uk/blogs/news/sauna-installation-uk) (29 August 2026, fetched 2026-10-29) - [Sauna Heater Supply: Sauna electrical requirements](https://saunaheatersupply.com/blogs/sauna-heater-supply-school/sauna-electrical-requirements) (fetched 2026-10-29) - [Harvia: KIP heater owner's and operator's manual](https://harviaheater.com/wp-content/uploads/2024/02/kip.pdf) (fetched 2026-10-29) - [Mr. Steam: Virtual technical support center](https://www.mrsteam.com/virtual-tech/) (fetched 2026-10-29) - [Mr. Steam: Steambath generator installation, operation and maintenance manual](https://pim.mrsteam.com/Resources/Entities/Mrsteam/Documents/6446cb4f-5f9a-433c-9c0a-111dab242cb3.pdf) (fetched 2026-10-29) - [Laticrete: TDS 172, steam rooms and steam showers](https://cdn-global.laticrete.com/-/media/project/laticrete-international/shared/files/support-and-downloads/technical-datasheets/tds172.ashx?la=en) (fetched 2026-10-29) - [Plunge: Cold plunge manual (copy hosted by Wellness Shop)](https://www.wellnessshop.ca/wp-content/uploads/2025/02/Cold-Plunge-Manual.pdf) (fetched 2026-10-29) - [Hydro Systems: Cold plunge chiller installation guide](https://hydrosystem.com/wp-content/uploads/2024/04/HS-Cold-Plunge-Install-Guide-Jan-2024.pdf) (January 2024, fetched 2026-10-29) - [Electrical Safety Authority: Finding the right contractor](https://esasafe.com/compliance/finding-the-right-contractor/) (fetched 2026-10-29) - [Electrical Safety Authority: Hire a licensed electrical contractor](https://esasafe.com/compliance/hiring-a-licensed-electrical-contractor/) (fetched 2026-10-29) ## Questions ### Should the installer pull the permits? Ask who applies for each permit and who books each inspection. Sauna Heater Supply says virtually every US jurisdiction requires a permit and inspection for a new high-amperage circuit. In Ontario, the person who does the electrical work must file the notification with the ESA. ### Can a cold plunge share a circuit with other equipment? Check the manual for your model. The Hydro Systems cold plunge chiller guide says the chiller must have a dedicated 110-volt, 20-amp GFCI receptacle. ### What should I get at handover? Get the manuals, the warranty terms, a maintenance schedule and any electrical certificate. In Ontario, ask for a copy of the ESA Certificate of Acceptance.