2–3 Person Bathroom Sauna
An indoor sauna that tucks into the corner of an existing bathroom or room. No foundation, no roof, no exterior siding — you frame the angled front and finish the inside. 6kW electric heater, L-shaped cedar benches, and a sloped floor with a centered drain.
This is a full design package for an indoor corner sauna — the kind you build into an existing bathroom, basement, or spare room rather than out in the yard. The footprint is a pentagonal corner layout, roughly 5'4" × 5'4" with a three-panel angled front face, giving you about 25 square feet of hot room and seating for 2–3 people. Because two of the walls and the ceiling are already there, the build is simpler and cheaper than a standalone: you only frame and finish the angled front panels. The design uses a 6kW electric heater, an L-shaped upper bench with two lower tiers in cedar, mineral wool insulation behind an aluminum foil vapor barrier, and a tile floor sloped to a centered drain so water has somewhere to go. Ventilation is a proper three-vent system — two passive vents plus a mechanical exhaust fan. The plan covers 13 construction phases from floor preparation to final electrical.
Get the Bathroom Sauna Plan
Everything you need to build this sauna — or hand to your contractor so they can price it and start building.
2–3 Person Bathroom Sauna — $49
Your plan will be delivered to your email within 24 hours of purchase.
Key Specs
Estimated Budget
Materials only: approximately $6,802 based on current pricing — the heater and door are the big-ticket items. The materials list in the package includes item-level pricing with links to specific products so you can price it out for your own zip code. This does not include electrician labor for the 240V heater circuit, permit fees, or plumbing labor for the floor drain. Total with a professional build: roughly $11,800–$13,800 depending on rates and site conditions.
What's Included in This Plan
Every item you need to build — framing, mineral wool, foil vapor barrier, cedar paneling, bench lumber, door, heater, lighting, ventilation, and the floor drain assembly. Includes quantities, unit pricing, and a linked Google Sheet you can copy and customize.
Interactive 3D model of the corner build. Rotate, zoom, and inspect the pentagonal footprint, angled front face, bench layout, and drain placement before you cut anything.
Illustrated step-by-step build guide covering floor preparation, floor drain and slope, front-wall framing, closing in the wall, electrical rough-in, insulation and vapor barrier, cedar interior, flooring, benches, door, heater, ventilation, and final electrical finishes — written for an indoor build.
Frequently Asked Questions
Can I really fit a sauna into a bathroom?
Yes. This is an indoor corner build with a roughly 5'4" × 5'4" pentagonal footprint (about 25 sq ft) that tucks into the corner of an existing bathroom or room. Two walls and the ceiling are already there, so there's no foundation or roof to build — you only frame and finish the angled front face.
How is the plan delivered, and what's included?
It's an instant PDF download after purchase. You get the full materials list with pricing and product links, an interactive 3D SketchUp model, and 13 step-by-step construction phases written specifically for an indoor build.
How much will the materials cost to build?
About $6,802 in materials at current pricing, with the 6kW heater and the door as the biggest line items. That figure doesn't include electrician labor for the 240V circuit, permits, or plumbing labor for the floor drain.
Do I need ventilation and a drain for an indoor sauna?
Yes — both are essential indoors, and the plan covers them. It uses a 3-vent system (two passive vents plus a mechanical exhaust) and a tile floor sloped to a centered drain so splash water and condensation leave the room.
Get the Bathroom Sauna Plan
Everything you need to build this sauna — or hand to your contractor so they can price it and start building.
2–3 Person Bathroom Sauna — $49
Your plan will be delivered to your email within 24 hours of purchase.
Need Something Different?
Have a different corner, an odd ceiling height, or a tighter space? We design fully custom indoor saunas tailored to your room, climate, and budget.
Learn About Custom Design →