How much does a custom sauna cost in Toronto?

A custom sauna is a room built in place to fit your space. A prefab sauna is a kit of factory-made panels that is put together on site. Three Toronto renovation firms publish prices for custom work, and each uses the word a little differently.

RenoHouse, a Toronto renovation firm, splits custom into two tiers in its 2026 basement sauna guide. Both sit in its list of prices for the sauna room itself, with labour and wiring on separate lines. A custom-built Finnish sauna in cedar, which it calls semi-custom, costs $12,000 to $25,000. A custom luxury build with a glass front and Wi-Fi controls costs $25,000 to $50,000 or more. A Finnish sauna is the traditional kind, heated by an electric heater topped with stones.

Magic Reno, a renovation company serving Toronto and the Greater Toronto Area, sorts its prices by sauna type instead. It lists a custom infrared sauna at $12,000 to $18,000 or more, a traditional Finnish sauna at $18,000 to $28,000 or more, and glass-front or hybrid builds at $28,000 to $40,000 or more. A hybrid room has both a Finnish heater and infrared panels. Magic Reno is one of the 39 companies listed in this index.

Oriel Renovations, also in Toronto, gives one wider band. It says a typical custom-built sauna in Toronto costs $30,000 to $75,000, depending on size and features, and that the cost includes materials, labour and design.

Our reading: the word custom tells you how a room is built, not what it will cost. Ask each firm which tier or type its quote belongs to.

The price ranges overlap. RenoHouse prices a prefab Finnish kit, from 4 by 5 feet to 5 by 7 feet, at $5,000 to $12,000 for the kit alone. A larger kit, from 6 by 8 feet to 8 by 8 feet, costs $8,000 to $18,000. Its semi-custom build starts at $12,000, so a large kit can cost more than a small custom room.

The clearer difference is labour. RenoHouse charges $1,500 to $3,500 to assemble a prefab Finnish kit. It charges $4,000 to $8,000 for a room built on site, which covers framing, tongue and groove cedar (boards that lock edge to edge) and finishing. The kit line, by its label, is assembly only.

For finished projects, RenoHouse gives $10,000 to $20,000 for a prefab Finnish kit with professional installation. Oriel Renovations gives the same $10,000 to $20,000 for a prefabricated sauna. The full list of indoor prices, with a source on every row, is on the indoor sauna cost guide, and the sauna kit cost guide covers kits and heaters.

A glass front changes more than the look. RenoHouse's sizing rule adds 1 kW (kilowatt, the heater's power rating) of heater for every 10 square feet of glass. In its worked example, a room 6 by 7 by 7 feet needs an 8 kW heater with a standard glass door, or a 9 kW heater with a full glass front.

A bigger heater can need a bigger circuit. A hardwired circuit is wired straight from the electrical panel rather than plugged in, and 240V is a heavier supply than a normal 120V wall outlet. Amps measure how much current a circuit can carry.

RenoHouse prices a hardwired 240V, 30- to 40-amp circuit for a heater up to 6 kW at $800 to $1,800. A 40- to 60-amp circuit for an 8- to 9-kW heater costs $1,500 to $2,800. For comparison, a 10 mm tempered glass sauna door alone costs $600 to $1,800 on RenoHouse's list.

The top of RenoHouse's luxury tier is written as $50,000 or more, so that source sets no upper limit. Oriel's custom band reaches $75,000. The ESA rules guide explains the permit a new heater circuit needs from the ESA, Ontario's Electrical Safety Authority.

This is where two quotes for the same room can differ most. Magic Reno says its prices include framing, insulation, electrical work filed with the ESA, the heater and the finish. RenoHouse prices many of those items as separate lines.

RenoHouse lists the building layers one by one. Foil-faced insulation costs $400 to $1,200. A foil vapour barrier, the layer that keeps moisture out of the walls, costs $200 to $500. An exhaust fan ducted outside with a timer costs $500 to $1,500.

The basement around the sauna is a separate job. Full basement work, covering demolition, drywall, tile and plumbing, costs $6,000 to $15,000 or more on RenoHouse's list. Its all-in figure for a semi-custom Finnish sauna with that full basement work is $18,000 to $32,000.

Oriel Renovations prices a third kind of job. It says fitting a sauna into an existing room of the house typically costs $15,000 to $50,000, a range that covers changes such as electrical upgrades.

Before you compare two totals, ask each firm to list the framing, insulation, vapour barrier, heater, controls, circuit, ventilation, door, floor and finish, and to mark which ones are in the price. Our reading: compare the lists before you compare the totals. The guide to reading a sauna quote goes through those lines one by one.

Longer than a kit. RenoHouse gives 2 to 4 weeks for a professionally installed prefab Finnish kit, with 3 to 6 days of actual work. A semi-custom sauna with full basement work takes 4 to 8 weeks, with 10 to 18 days of work. A luxury custom hybrid room with a cold plunge takes 8 to 14 weeks. RenoHouse adds that permits and the ESA filing take another 2 to 6 weeks before work starts, and that cedar boards can take 1 to 3 weeks to arrive.

Permits are part of that time. The City of Toronto says a building permit is needed to finish a basement when the work includes structural or material alterations, or new or changed heating or plumbing. RenoHouse says a basement sauna that adds walls and a 240V circuit triggers a permit. Magic Reno takes a narrower view: it says a building permit is typically not required for an interior sauna without structural changes, and that the 240V circuit needs an electrical permit from the ESA. Ask the City about your own plans. RenoHouse's guide puts the City's minimum permit fee at $214.79 and says most sauna projects pay $300 to $800 in permit fees.

A plug-in infrared cabin is the quick exception. The guide to a sauna in a Toronto condo covers that route.

Of the 39 companies in this index, 13 describe installation or build work on their own websites, 12 describe selling sauna and cold plunge equipment, and for the other 14 the index could not tell either way. Magic Reno, filed under Willowdale on the Toronto page, is one of the 13. The full list is on the saunas page, and how the index is built explains where each record comes from.

The index does not record licences, warranties, finished projects or how long a company takes. RenoHouse, Magic Reno and Oriel Renovations are renovation firms that sell this work, so their prices are what they charge, not independent surveys. SaunaIndex does not sell saunas and earns nothing from the firms named here; the about page explains how the site is run.

On a job priced at $12,000 or more, ask each firm for a written scope, its timeline and two recent clients you can call. If you spot an error on this page, the contact page reaches the team.