How Much Does It Cost to Build a Backyard Sauna?
If you build Honka yourself, allow about $11,500 to $15,500 for materials and equipment in the U.S. Honka is our backyard sauna for four to five people. With hired carpentry, the estimate comes to $23,500 to $27,500. Budget separately for the foundation, site work and electrical installation.
Honka cost breakdown
Estimated prices for the Honka sauna and deck in USD, based on November 2026 retail prices. This build uses spruce paneling and alder benches.
| Cost item | Low | High |
|---|---|---|
| Framing lumber for the sauna and deck | $750 | $950 |
| Wall and roof plywood sheathing | $400 | $550 |
| Wall and ceiling mineral wool insulation | $250 | $350 |
| Housewrap, sauna foil, tapes and flashing | $200 | $350 |
| Furring strips, plywood spacers and trim | $200 | $325 |
| Pine siding, soffits and exterior wood finish | $1,650 | $2,000 |
| Bitumen roof base and cap sheets, primer and drip edges | $375 | $550 |
| Wood floor, drainage gutter, deck boards and fascia | $250 | $400 |
| Spruce wall and ceiling paneling and alder bench boards | $2,700 | $3,200 |
| Bench framing, supports and legs | $80 | $150 |
| Front glazing, ¾-inch tempered insulated glass units | $1,400 | $1,800 |
| Window frames and seals, site-built wood door and hardware | $250 | $450 |
| Ventilation ducts, vents, fittings and supports | $100 | $180 |
| Screws, nails, structural connectors and sealants | $225 | $425 |
| 9 kW electric heater, controls and stones | $2,900 | $3,700 |
| Materials and equipment (rounded) | $11,500 | $15,500 |
| Carpentry (160 hours × $75/hour) | $12,000 | $12,000 |
| Total with carpentry (rounded) | $23,500 | $27,500 |
The front glass price is for the glass units. Frames and seals are on the next line. Have your builder check the opening sizes before you order.
Carpentry time
We allowed 160 hours of carpentry. That's about four weeks for one carpenter or two weeks for a crew of two. A carpenter who's familiar with sauna builds may work faster.
Costs to price for your site
Start with the foundation and the work needed to get the site ready. Get a separate price for drainage beyond the sauna and for running power to it. On an island or a site you can't drive to, ask how the lumber and glass will get from the delivery truck to the building spot.
Set aside money for the drawings, delivery, taxes and any permits you need. Check which of these costs are already covered in your builder's quote.
Wood and heater prices
Interior wood
The prices below cover the wall and ceiling paneling and the boards you sit on. Bench frames, fasteners and finishes are separate. Honka takes roughly 150 to 200 square feet of interior paneling. If you're buying tongue-and-groove boards, ask how much wall each pack covers once the boards are fitted together.
| Paneling and bench boards | Low | High |
|---|---|---|
| Spruce paneling with alder bench boards | $2,700 | $3,200 |
| Thermo-spruce paneling with thermo-aspen bench boards | $3,900 | $4,600 |
| Paneling and bench boards | Low | High |
|---|---|---|
| Basswood paneling with basswood bench boards | $1,300 | $1,500 |
| Clear Western Red Cedar paneling and bench boards | $4,500 | $5,200 |
The Canadian examples use narrower bench boards. If you choose one of those options, have your carpenter check the bench layout before ordering.
Sauna heater price comparison
| Item | Approx. USD |
|---|---|
| Harvia Cilindro PC90 | $1,600 |
| Harvia M3 | $1,000 |
| Sauna stones | $200 |
| M3 chimney kit (sloped roof) | $1,500 |
| M3 heat shield and floor plate | $700 |
Getting a quote from a carpenter
Give your carpenter the drawings and ask for an itemized quote. Have them separate materials from labor and spell out who's handling the glass, heater installation and site work. That makes it easier to compare two bids or decide which parts you want to do yourself.