Home Sauna Design: A Complete Guide to Planning Your Perfect Sauna

Planning a home sauna? Here is a complete guide to the key decisions — from choosing the right type and size to timber selection, heater choice, and what to expect from the installation process.

A home sauna is a significant investment, and getting the design right from the outset will ensure you enjoy it for decades. Here is a comprehensive guide to the key decisions involved in planning a home sauna.

Step 1: Choose the Right Type of Sauna

The first decision is whether you want an indoor sauna, a garden sauna, or a container sauna. Indoor saunas are ideal if you have an existing room that can be converted — a bathroom, ensuite, home gym, or basement. Garden saunas are the best choice if you have outdoor space and want a standalone structure. Container saunas are a good option if you want something relocatable or with an industrial aesthetic.

Step 2: Determine the Right Size

Sauna size is typically expressed in terms of the number of people it is designed to accommodate. A 1–2 person sauna requires a floor area of approximately 1.2m x 1.5m. A 4-person sauna typically requires around 1.8m x 2.1m. A 6-person sauna requires approximately 2.1m x 2.4m or larger.

It is worth noting that many of our clients choose a sauna that is slightly larger than they initially think they need — the additional space is rarely regretted, and a larger sauna heats up proportionally rather than exponentially.

Step 3: Choose Your Timber

The interior timber defines the aesthetic and feel of your sauna. Clear Alder is the traditional Finnish choice — light, smooth, and excellent thermal properties. Western Red Cedar is aromatic and beautiful. Thermowood has a rich, dark tone and outstanding durability. We guide every client through the options during the design consultation.

Step 4: Select Your Heater

The heater is the heart of the sauna. The most important factor is matching the heater power to the sauna volume — as a rough guide, you need approximately 1kW of heater power per cubic metre of sauna volume. We work with Harvia, Huum, and Narvi — the leading Finnish heater manufacturers — and recommend the optimal model for your specific installation.

Step 5: Plan the Lighting

Lighting has a profound effect on the sauna experience. We recommend warm, amber-toned LED lighting at low level — avoiding overhead lighting which can feel harsh. Chromotherapy (colour-changing) lighting is a popular option for clients who want to customise the atmosphere. All lighting must be specified for the sauna environment — standard domestic fittings are not suitable.

Step 6: Consider the Extras

• —Sound system: Discreetly integrated speakers engineered for the thermal environment
• —Cold plunge: An outdoor shower, cold plunge pool, or ice bath to complete the wellness circuit
• —Deck or terrace: An outdoor relaxation space adjacent to the sauna
• —Smart controls: Remote temperature monitoring and scheduling via a smartphone app
• —Window or glazed door: Natural light and a view of the garden transform the experience

The Design Process at South Coast Sauna Co.

Every project begins with a complimentary design consultation — either in person or via video call. We assess your space, discuss your requirements, and within 48 hours deliver a full written quotation, detailed CAD drawings, and a clear material specification. There is no obligation and no cost.