Cube Saunas
Ula L Ebony.The dark architectural cube.
The Ula L specified in Shou Sugi Ban charred timber, the same 5–6 person capacity in an architectural black finish.
Overview
Ula L Cube Sauna, Ebony.
The Ula L Ebony is the Ula L specified in Shou Sugi Ban charred spruce, same 5–6 person capacity, same insulated construction, same Harvia 9kW heater, but the exterior is deep matte black instead of warm honey beige.
This is the spec we recommend for design-led garden schemes: pale stone patios, contemporary landscaping, dark-framed garden rooms. The charred exterior anchors the garden rather than sitting into it.
The Shou Sugi Ban is a genuine 400-year-old Japanese timber-preservation technique done properly with propane flame and Danish oil. The carbonised surface is the preservative, it can't chip or peel like paint.
Key features
What makes it different.
5–6 person capacity
Twin-tier hemlock benches, five adults comfortably, six socially.
Full-glass front wall
Panoramic toughened glass gable and door.
Shou Sugi Ban ebony cladding
Genuine charred and oiled spruce, deep matte black that ages to graphite.
Harvia 9kW heater
Sized for the larger internal volume. 30-minute warm-up.
100mm rockwool insulation
Efficient running through Scottish winters.
Hemlock interior
Knot-free western hemlock throughout.
Specification
The numbers behind the object.
- Capacity
- 5–6 adults
- External footprint
- 3.0 x 2.4 m
- Interior ceiling height
- 2.1 m
- Cladding
- Shou Sugi Ban charred spruce
- Insulation
- 100mm rockwool
- Lining
- Knot-free western hemlock
- Heater
- Harvia electric 9kW
- Heat-up time
- ≈ 30 minutes
- Power requirement
- 32A single-phase
- Roof
- EPDM flat
- Warranty
- 10 yr structural
Living with it
How it actually works day to day.
The charred timber is the preservative, no annual paint refresh, no peeling, no fading to a muddy grey. Re-oil every 3–4 seasons if you want to preserve the deep matte black; leave it and let it silver to graphite if you prefer.
Against pale stone or render, the ebony reads as a piece of sculpture. Against dark timber cladding or a dark garden room, it disappears into a considered architectural composition.
Interior spec is identical to the beige, hemlock throughout, twin-tier benches, 9kW Harvia. The choice between beige and ebony is purely aesthetic.
Best for
Who typically buys this one.
- Contemporary and architectural garden schemes
- Pale-stone or pale-render properties where the ebony reads as sculpture
- Design-led new-builds and renovations
- Owners wanting a maintenance-friendly finish (Shou Sugi Ban needs less than paint)
Real installations
Ula L in Scottish gardens.
Every photograph on this page is a genuine Signature Garden Rooms installation.
Only the exterior finish. Ebony is Shou Sugi Ban charred spruce (deep matte black). Beige is thermowood with clear oil (warm honey natural). Interior, heater, glass, benches and warranty are identical.
Next step
Ready to talk about the Ula L Cube Sauna, Ebony?
Tell us your garden, your access, and roughly when you'd like it in. We'll come back with a considered price, honest lead time, and any planning notes for your site.
Fully insured · £5m public liability · Falkirk-based, working across Central Scotland