Full design package for an owner-built outdoor sauna at a lakeside cabin — 3D model, materials list, and construction instructions delivered remotely.
This project is a good example of what our remote design services look like. A client based in Minnesota reached out with a clear vision: an 8x12 outdoor sauna with a dedicated changing room at his lakeside cabin in Northern Wisconsin. He and his brother had the construction skills to build it themselves — they'd done remodeling work before and were comfortable framing walls and running a build. What they needed was help hashing out the technical design details specific to sauna construction. Things like which electric heater to choose, how to configure the benches, where to place windows, how to design and construct a floor drain, how to set up the ventilation system, and what materials to use throughout. We put together a complete design package that included a dimensionally accurate 3D model in SketchUp, a detailed materials list with pricing and sourcing, and a set of construction instructions covering the sauna-specific order of operations. The client took those materials and ran with them — exactly how remote design is supposed to work.
Location: Northern Wisconsin (remote design)
Size: 8x12 ft (hot room + changing room)
Type: Owner-built, remote design
Why Remote Design
Not every sauna project needs a local contractor or an in-person consultation. This client had the hands-on skills to build the sauna himself — what he didn't have was experience with the specific technical decisions that separate a good sauna from a mediocre one. That's the gap remote design fills. We handled the design and planning, he handled the construction. The deliverables — a 3D model, materials list, and construction guide — gave him everything he needed to build with confidence without us ever setting foot on the property.
Design Goals
Design an 8x12 outdoor sauna with a dedicated changing room — a small entry space to hang towels, take off shoes, and keep cold air from rushing into the hot room when the door opens.
Spec the right electric heater for the room volume and cold climate — compare options across performance, WiFi capability, and budget so the client could make an informed decision.
Configure an L-shaped, three-tier bench layout that maximizes seating in the ~8x8 hot room while keeping the top bench in the optimal heat zone with 7.5-foot ceilings.
Design the building envelope for Upper Midwest winters — below-zero temperatures, proper vapor barrier placement, and insulation strategy for walls, ceiling, and an insulated subfloor over a concrete slab.
Provide a complete, priced materials list so the client could source everything locally in Northern Wisconsin without guessing at quantities or specs.
Key Design Decisions
Heater selection: We walked through several electric heater options — comparing standard models, WiFi-enabled heaters for remote startup from your phone, and convection-based heaters like the Sanum that actively circulate air. For a cabin you're not always at, WiFi control is a practical advantage: turn it on from the house and it's ready when you walk out.
Ceiling height and bench tiers: The client initially planned 7-foot ceilings. We recommended bumping to 7.5 feet to support a proper three-tier bench layout — a step-up bench near the floor, then two full benches spaced about 17 inches apart. The extra height keeps the top bench in the best heat without anyone ducking.
Window placement: Windows are a trade-off between views and heat retention. We worked through the site orientation — lake views to one side, a neighboring lot on the other — and recommended placing windows strategically to capture the best sightlines without unnecessary heat loss.
Floor drain design: With a concrete slab foundation, the drain location and pipe routing had to be planned before the pour. We detailed drain placement near the center of the hot room with a slight floor slope, so the client could coordinate with his concrete contractor on timing.
Ventilation system: Proper air exchange is critical and often overlooked in DIY builds. We designed the intake and exhaust vent placement and sizing for the hot room volume to ensure good airflow without dumping heat.
Wall construction and insulation: We recommended 2x4 framing for the walls — with sheathing, house wrap, insulation, foil vapor barrier, and cedar paneling, there are enough layers to perform well even in extreme cold without sacrificing interior space by going to 2x6. The insulated subfloor over the slab uses rigid foam between joists for additional cold-climate protection.
What the Design Package Included
3D model: A dimensionally accurate SketchUp model with measurements for every wall, bench, window opening, and structural element — something the client could reference throughout the entire build.
Materials list with pricing: A line-by-line spreadsheet of every material needed, with pricing and sourcing notes. The client adapted this to local suppliers in Northern Wisconsin.
Construction instructions: A step-by-step guide covering the sauna-specific order of operations — framing sequence, vapor barrier installation, insulation approach, paneling, bench construction, heater installation, and ventilation setup.
Key Specs
Overall dimensions: 8x12 ft exterior (8x8 hot room + 3.5 ft changing room).
Heater: Electric, 240V dedicated circuit, sized for ~8x8 hot room volume.
Interior: Cedar paneling on walls and ceiling, three-tier L-shaped bench layout.
Ceiling: 7.5 ft flat ceiling under a 4/12 pitch roof.
Foundation: Concrete slab with insulated 2x6 subfloor (rigid foam between joists).
Exterior: Half-log siding to match existing cabin.
Flooring: Tile in hot room with center floor drain, sloped for drainage.
Ventilation: Passive intake and exhaust vents sized for hot room volume.
Lighting: Warm LED strip lights mounted under the benches for soft ambient glow. LED Lights | Adapter
Changing room: ~3.5 ft wide entry space with bench seating and hooks.
Get the Full Plan for This Project
Includes the layout, materials list, heater sizing, bench dimensions, and design notes — everything you need to use this project as a reference for your own build.
8x12 Sauna with Changing Room Plan — $49
Your plan package will be delivered to your email within 24 hours of purchase.
Building Your Own Sauna? We Can Handle the Design.
If you've got the skills to build but need help with the sauna-specific design decisions — heater selection, bench layout, ventilation, materials, vapor barriers — that's exactly what our remote design service covers. We'll deliver a 3D model, materials list, and construction guide so you can build with confidence from anywhere in the country.
Tahoe Sauna Company provides design and consulting services only. Construction is performed by the client or by an independent, properly licensed contractor hired directly by the client under a separate agreement.
Free: DIY Sauna Design Checklist
12 decisions that determine how well your sauna performs — insulation, bench height, heater sizing, ventilation, and more. Get them right before you build.