DIY Sauna vs Kit: Cost, Time and What to Hire Out

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“DIY sauna” covers three different jobs: assembling a prefab kit, lining a shell you framed yourself with a material kit, or sourcing every board yourself. The carpentry can be yours on all three; the heater circuit is not, because a licensed electrician wires it and pulls the permit. On cost, Fixr (updated January 2025) says “A prefab, four-person kit that you install yourself averages $2,640 to $4,790,” while a custom-built four-person sauna measuring 8 x 5 feet, professionally installed, “will average $7,140.” If you can frame a wall, a material kit or a scratch build is realistic; if you can’t, a prefab kit is the shorter road.

DIY or kit: the three ways to build

SaunaFin describes its prefab walls as “self-supporting,” with “no additional framing or insulation.” For its material kits: “You or your contractor build the frame walls, insulate and finish the exterior.” The sources disagree on which is more common: Fixr says “About 90% of saunas sold today are prefab,” while SaunaFin, which sells both, says “Sauna kits are more popular than pre-fab saunas.” Neither says where its figure comes from.

Cost comparison

They price different things, so nothing here is averaged.

No source prices a from-scratch DIY build as a total; the parts list below shows what the guides say each piece costs. Fixr also notes that “a good quality prefab sauna will still cost you almost the same as a custom sauna, depending on what you want.”

SaunaFin’s kit prices don’t include the studs, insulation, wiring or exterior finish you supply, or freight. Its U.S. freight table runs $890 to $1,840 by zone and kit size, plus a $225 packaging charge; SaunaFin calls the table “an estimate,” says freight “will be confirmed before” the order is finalized, and elsewhere on the same page gives an “average freight range” of “approx. $350.00 to $600.00.” SaunaFin also claims its kit “will generally save you $400-$800” over buying parts “a la carte.”

Time and skills needed

SaunaFin’s rule of thumb for its material kits: “If you can erect the stud framing, you will have no problem installing the sauna kit.” Almost Heaven’s barrel manual lists a cordless drill, rubber mallet, hammer, framing square, screwdrivers, utility knife, level and wrench as helpful tools, and warns to “use two or more people” when moving and lifting heavy pieces.

Materials list for a DIY build

SaunaFin’s list of what its customers supply for a material kit is a fair outline of a scratch build too: 2 x 4 stud framing for walls and drop ceiling, fiberglass insulation (it names 3½-inch R-12 or R-13 batts), wiring, and an exterior finish.

If you source those parts yourself, here is what the two guides say they cost:

Fixr’s insulation note: R13 is usual in 2 x 4 walls, R19 in 2 x 6 walls, and the ceiling “needs to be R26 or higher.” The North American Sauna Society says the ceiling is “the most critical location to insulate well,” with fiberglass plus an aluminum foil vapor barrier. Vent placement is covered on sauna ventilation.

The heater is the part not to improvise. The North American Sauna Society says to “Use only UL listed heaters” and that each has “specific size ranges within which they safely operate.” UL 875 (10th edition, July 2024), the UL standard for electric dry-bath heaters, covers both a heater installed in a room “built or assembled in the field to comply to the manufacturer’s size specifications” and a heater sold with a factory-built room. So choose the heater early and build the room inside its maker’s size range.

What to hire out

• The heater circuit and hookup. Almost Heaven’s manual: “ALL ELECTRICAL WORK NEEDS TO BE COMPLETED BY A LICENSED ELECTRICIAN.” Breaker and wire size come from the heater manual; a licensed electrician confirms the circuit and pulls the permit. See sauna electrical requirements.
• A wood stove and chimney. Follow the stove manual and your local building code for clearances, chimney and floor protection, and ask your building department whether you need a permit.
• Digging. Call 811 a few business days before you dig for a footing or a trench. Base choices are on sauna foundation options.
• The permit question. Ask your building department before you start; a framed outbuilding and an electrical circuit may each need one.

Fixr adds that with a prefab, “it is wise to have a professional install your pre-built sauna to ensure you have the proper set-up and don’t void your warranty.”

When a kit makes more sense

SaunaFin points to a prefab when you’re renting (it “can be dismantled and re-assembled elsewhere”), when you can’t build one yourself or find someone who will, or when you want an outdoor sauna, where it says the choice of freestanding styles and sizes is larger. It points to a material kit when the sauna is part of a renovation or needs an odd size or shape, and says material kits are available faster than its prefabs (“generally, 2-3 weeks” on its outdoor page; its kit page says “Shipped in 3-5 weeks”). A scratch build means sourcing and cutting every piece yourself; SaunaFin notes that lumber yards generally carry only 8-foot or random lengths, “which creates a lot of waste” in a small room. For what a boxed outdoor kit actually contains, see what’s included in an outdoor sauna kit; for full outdoor budgets, see outdoor sauna cost.

Sources

1. Fixr — How Much Does It Cost to Install a Sauna? (updated Jan 31, 2025)
2. HomeGuide — How Much Does a Home Sauna Cost? (dated Sept 5, 2023; page title says 2026)
3. SaunaFin — Sauna Material Kits (what the kit includes, what you supply, install time, freight table) (checked Nov 1, 2026)
4. SaunaFin — LK Plus material kits, listed prices in USD (site default is CAD) (checked Nov 2, 2026)
5. SaunaFin — Outdoor Saunas (prefab vs. material kit) (checked Nov 1, 2026)
6. Almost Heaven Saunas — Barrel Sauna Installation & Owner's Manual (9-2024), pp. 2–3
7. Almost Heaven Saunas — outdoor saunas collection, listed prices (checked Nov 1, 2026)
8. Almost Heaven Saunas — Professional Assembly (checked Nov 1, 2026)
9. North American Sauna Society — Build a Sauna (© 2026)
10. UL 875 Ed. 10-2024, Electric Dry-Bath Heaters (published July 8, 2024), scope via ANSI Webstore
11. Call 811 (Common Ground Alliance) — 811 Before You Dig (accessed Nov 1, 2026)

Updated 2026-11-02