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Modular sauna 7×2.7m made of thermally modified wood: expert guide 2026. #1 export to Germany, manufacturer's prices. Photos, videos

19.06.26

🏗️ Architecture and design - an engineering approach to a modular sauna

Frame-panel technology: why it works

The bathhouse, measuring 7000 x 2700 x 2850 mm (with a usable area of 18.9 m²), is constructed using frame-panel technology . It is not a temporary building, but a carefully designed complex optimized for:

✅ Fast delivery in assembled form (without the need for a construction site at the customer's site)
✅ Installation without a solid foundation
✅ Stability of geometry under cyclic loads (heating/cooling, moisture/dry air)
✅ Easy scaling and modification to suit customer needs

Why 215°C Thermowood is a must for exterior cladding.

Ordinary wood under conditions of cyclic heating, moisture and atmospheric influences:

Expands/contracts → deformations, cracks, seam divergence
Absorbs moisture → rot, mold, unpleasant odor
Requires annual treatment with antiseptics and painting.

Thermally modified wood from Thermowood Production is treated at 215°C in a superheated steam environment.

Drying to moisture content <12%
Heating to 215°C in an oxygen-free environment.
Breakdown of hemicellulose (water-absorbing polysaccharides)
Lignin crystallization → rigid cell wall
Fixing humidity at a level of 3-5%

The result is a material with unique properties:

Indicator	Common pine	Thermowood (215°C)
Dimensional stability	Shrinkage up to 10%	Shrinkage <1%
Moisture absorption	10–15%	3–5%
Rot resistance	Class 3–4 (EN 350)	Class 1 (highest)
Thermal conductivity	High	20-25% lower
Tar production	Yes, at 90°C+	Absent
Service life	2–3 years	20–30 years old

🧪 Scientific confirmation : Research by VTT Technical Research Centre of Finland confirms that thermally modified timber of the Thermo-D class has rot resistance class 1 – the highest level according to the European standard EN 350.

📐 Specifications and planning

General parameters:

Parameter	Meaning
External dimensions	7000 × 2700 × 2850 mm
Usable area	18.9 m²
Ceiling height	2200 mm (internal)
Construction	Frame-panel, modular, 1 set
Weight of the structure	~2800 kg (without equipment)
Manufacturing time	2 months after the advance payment
Guarantee	5 years for the structure, 2 years for the equipment

Space zoning:

Zone	Square	Peculiarities	Purpose
Couple	~6.5 m²	Linden lining, foil insulation, 100 mm insulation, drain, cement-bonded particle board under the tile	Warming, steaming, aromatherapy
Recreation room	~9.0 m²	Imitation timber 22 mm, panoramic window, fully wired for electricity.	Rest between sessions, storage of things
Shower/toilet	~3.4 m²	Cement particle board under tiles (Customer's), outlets under sink/shower/boiler	Hygiene, comfort, independence from external communications

Materials and accessories:

✅ Frame : pine timber 100×50 mm, bioprotection treatment
✅ External cladding : heat-treated imitation timber (planken) 22 mm, horizontal installation, on all sides
✅ Insulation : 100 mm mineral wool + class A+ vapor barrier
✅ Interior paneling : Steam room: linden paneling (hypoallergenic, non-scorching). Dressing room/shower: 22 mm imitation timber.
✅ Floor : Antechamber: 32 mm tongue and groove board. Steam room/shower: Cement particle board with tile (the customer purchases and installs the tiles themselves).
✅ Roofing materials : single-pitched corrugated sheet, color "Anthracite" (RAL 7016)
✅ Door : Entrance: metal-plastic, single-chamber, laminated "Anthracite", 2000 × 860 mm. Internal (to the steam room): Tesli RS for sauna, 1900 × 700 mm
✅ Windows : Panoramic: 2 pcs., 1500×1900 mm, tempered glass 8 mm, transparent. With a transom: 2 pcs., 1500×400 mm, for salvo ventilation
✅ Stove : Novaslav Panorama PKS 02K C3 wood-burning stove (without stones)
✅ Fire protection : magnesite + stainless steel screen with thermal protection 1100°C + ventilation valves F-100 (alder)
✅ Electricity : full wiring, panel, sockets, switches, track lights, LED shelf lighting, paired lamps, pipe heating
✅ Plumbing : water and sewer piping, outlets for sink, shower, and boiler (equipment not included)
✅ Coating : Exterior: 2 coats of Vidaron V07 "California Redwood", matte (9 l × 3 buckets). Interior: clear varnish (walls, ceiling, floor)

💡 Expert advice : Cement particle board in the steam room and shower is a professional solution. The client chooses the tiles themselves, controlling the design and budget, and the base is ready for installation.

🔥 Fire safety and engineering systems

Fire protection circuit for a wood stove:

Novaslav Panorama stove with a remote firebox → combustion zones are located outside the steam room
Magnesite board → thermal barrier, non-combustible material of class NG
Stainless steel screen with thermal protection 1100°C → convection protection, air gap cools the structure
F-100 ventilation valves (alder) → draft control, microclimate control, rapid ventilation
Master Flash + metal ceiling cover → sealing the roof penetration, preventing sparks from entering

Electrical safety:

✅ Moisture-resistant cable (VVGng-LS), protection class of sockets and lamps IP54
✅ Separate panel with circuit breakers, RCD 30 mA, grounding ≤4 Ohm
✅ Track lights + LED shelf lighting → aesthetics + functionality + safety
✅ Paired luminaires → special design for damp rooms with high temperatures
✅ Pipe heating → preventing condensate from freezing in winter

📜 Standard Compliance : The design meets the requirements of DSTU B V.2.2-15, EN 14915 (domestic and commercial saunas), and DIN 68800 (fire protection of wood-burning stoves). For commissioning a commercial facility, it is recommended to obtain a fire inspection report and an insulation resistance measurement report.

🌿 Eco-friendly and wellness-friendly

Why linden in a steam room is an investment in health

Health factor	Advantages of linden lining	Why is this important?
Hypoallergenic	Does not emit resin, allergens or toxins.	Safe for children, allergy sufferers, and people with sensitive skin
Tactile comfort	The surface is soft and warm to the touch and does not burn the body.	Comfort when in contact with hot surfaces
Natural aromatherapy	Light honey aroma when heated	Relaxation, stress relief without artificial flavors
Moisture resistance	Natural moisture resistance, minimal expansion	Durability, geometric stability
Aesthetics	Light, uniform color, pleasant texture	Visual comfort, feeling of cleanliness

Thermowood Production's environmental passport:

Parameter	Standard	Health benefits
Materials	100% natural wood, mineral wool, steel.	No toxic fumes
Chemical treatment	Only outside: Vidaron (safe impregnation), inside – clear varnish	Safe when heated, no harmful fumes
Energy efficiency	100 mm insulation + thermally modified wood + foil insulation	Reduce energy consumption by 20–30%
Water conservation	Steam room trap, cement particle board under the tiles	Easy cleaning, minimal water use
Certification	CE, FSC/PEFC, ISO 9001, DSTU, EN 14915	Compliance with Ukrainian and European standards

🌱 Expert opinion : The combination of thermally modified wood on the outside and linden wood on the inside of the steam room creates the perfect balance between durability, safety and comfort.

💰 Economic justification and payback

Transparent cost calculation:

Position	Amount (UAH)
Basic package (thermated exterior sheathing, frame, insulation, roof, floor, doors, basic electrical/plumbing)	443 946,00
Novaslav Panorama stove + pipes/linings/MasterFlash	35 720,00
Partitions (1 with a Tesli RS door + 1 for a shower)	26 409,00
Windows (2 panoramic 1500×1900 + 2 with a transom 1500×400)	61 892,00
Electrical installation work (equipment + installation, full set)	60 500,00
Plumbing work (piping + equipment outlets)	16 000,00
Fire protection (magnesite + stainless steel screen, 1100°C)	10 914,00
Ventilation valves (alder) F-100, 2 pcs.	4 570,00
Vidaron impregnation (3 buckets x 9 l, outside)	3 051,00
🎁 BONUS: 2 thermowood headrests	0,00
TOTAL VAT	663 002,00

📌 The price is fixed and does not change after the contract is signed. Plumbing fixtures and tiles are purchased by the customer.

For private use (savings on vacation):

Expense item	A regular bathhouse "from scratch"	Bathroom 7×2.7 m (Thermowood)
Starting price	400 000 – 700 000 ₴	663 002 ₴
Annual maintenance (paint, antiseptic, repair)	15,000 – 30,000 UAH/year	0 ₴ (thermowood does not need)
Repair/replacement of elements (3–5 years)	50 000 – 100 000 ₴	0 UAH (thermowood does not rot)
Total expenses for 10 years	≈ 800 000 – 1 300 000 ₴	≈ 663 002 ₴
Savings over 10 years	—	✅ 137 000 – 637 000 ₴

🎯 Conclusion : A Thermowood Production sauna pays for itself due to the absence of maintenance costs in the 4th or 5th year , and then continues to work for you without any additional investment.

For business (rental/green tourism):

Indicator	Calculation	Result
Cost of a bathhouse	Basic configuration + options	663 002 ₴
Average bill per session	800–1,500 UAH/hour (depending on the region)	1,200 ₴ (average)
Number of sessions/day	3–5 (at 60–80% occupancy)	4 sessions
working days/month	22–26 (season)	24 days
Monthly income	1 200 ₴ × 4 × 24	115 200 ₴
Operating expenses (firewood, water, electricity, cleaning)	~15% of income	~17 300 ₴
Net profit/month	115 200 – 17 300	97 900 ₴
Payback	663 002 ÷ 97 900	✅ 6–8 months

📈 Real scenario (taking into account off-season, marketing, taxes): payback period is 10-14 months .

Additional sources of income for business:

✅ Package offers : " Bathhouse + barbecue + tea" - +30-50% to the average bill
✅ Subscriptions : 10 sessions at a discount - guaranteed client flow
✅ Night rates : +20–40% to the cost for evening hours
✅ Photo zones : panoramic windows and stylish design – free marketing from guests
✅ Sales of related products : bath whisks, sauna oils, drinks — +10–15% to revenue

💡 Expert advice : Add an ice bath or plunge pool to your sauna – this will increase the average bill by 40-60% and create a unique offer on the market.

⚖️ Comparison with similar products – why this sauna wins

7×2.7 m sauna (thermowood) vs. sauna "from scratch":

Criterion	Bathhouse "from scratch"	Bathroom 7×2.7 m (Thermowood)
Implementation period	3–6 months	2 months (production) + delivery
Turnkey price	Grows during construction	Fixed, transparent
Quality control	Depends on the qualifications of the team	Factory, every operation
Guarantee	1 year (often without written commitment)	5 years for the structure
Mobility	Impossible	Possible relocation
Foundation	A major overhaul is needed	Not required (site recommended)
Operating costs	Annual sanding, finishing, repair	Minimal (thermowood does not require maintenance)

✅ Conclusion : A modular bathhouse is an ideal solution for quickly launching a business or private use without the stress of construction.

Thermally Modified Wood 215°C vs. Other Sauna Materials :

Material	Service life	Care	Safety	Aesthetics	Price/Quality
Thermopine (215°C)	20–30 years old	Minimum	High resin content (resin-free)	Chocolate color, stable	⭐⭐⭐⭐⭐
Common pine	2–3 years	Annual	Low (resin, burns)	It darkens and cracks.	⭐⭐
Cedar (Canada)	10–12 years	Average	Medium (resin in nodes)	Pinkish brown, knots	⭐⭐⭐
Linden/Alder (outside)	3–5 years	Annual	Average	Light, darkens quickly	⭐⭐⭐

✅ Conclusion : Thermosonic 215°C for external cladding + linden inside the steam room is the optimal balance of price, durability, safety and aesthetics.

🚛 Delivery, installation, and site preparation

Delivery terms:

✅ Assembled delivery by hired transport throughout Ukraine
✅ Delivery costs are agreed upon individually, payment to the driver on site
✅ Unloading : a truck crane or manipulator is required (the customer provides access)
✅ Export to the EU : full support, EUR.1 certificate (0% duty), documentation in German/English

Site requirements:

✅ Flat surface (level difference ≤3 cm over 5 m)
✅ Access for a truck (width ≥3 m)
✅ Connection to the power grid (220V or 380V, power ≥9 kW)
✅ Water and sewerage supply (for the shower area)
✅ Distance from the site boundaries ≥1 m (in accordance with DBN)

Types of foundations (optional):

Type	Description	Price	Installation time
Concrete slab	Reinforced concrete 100–150 mm with reinforcement	25 000–45 000 ₴	3-5 days
Strip foundation	Concrete strip around the perimeter	30 000–55 000 ₴	5–7 days
Screw piles	Steel piles with blades are screwed into the ground	18 000–35 000 ₴	1–2 days
FBS blocks	Finished blocks on a sand bed	12 000–22 000 ₴	1–2 days

✅ Advantage of a modular bathhouse : No need for a solid foundation - saving 50-70% on the cost of preparatory work.

🧼 Care and maintenance – how to maintain perfect condition

Daily care:

✅ Wipe the benches with a damp cloth after each use
✅ Check the water level in the drainage bucket (if present)
✅ Ventilate the room for 10–15 minutes after the session (using the windows)

Monthly care:

✅ Clean the stove and chimney from soot (according to the manufacturer's instructions)
✅ Check the wiring for damage
✅ Clean ventilation filters (if present)

Annual care (optional):

✅ Renewal of the Vidaron exterior coating (every 3–5 years to maintain color)
✅ Professional maintenance of the furnace and electrical equipment (optional)
✅ Checking the tightness of windows and doors

💡 Lifehack : Thermowood doesn't require chemical treatment—simple care is enough to maintain its perfect condition for decades. The material's color is consistent throughout, so even after sanding, the surface looks like new.

🌍 Export to Germany - full support "from factory to door"

Why do German customers choose Thermowood Production?

Germany is our number one priority market , accounting for over 45% of all international shipments. Here's why:

Advantage for the German market	What does this mean for the client?
EN 14915+DIN 68800 certification	Full compliance with German building codes and fire safety requirements
EUR.1 Certificate	0% import duty for customers in Germany thanks to the EU-Ukraine Association Agreement
Thermowood 215°C	Complies with German eco-standards: no chemicals, no toxins, 100% natural
Logistics "to the door"	Delivery to any point in Germany: Berlin, Munich, Hamburg, Frankfurt, Stuttgart
Documentation in German	Instructions, technical data sheets, warranty cards – a complete package in the customer’s language
24/7 support	Consultations in German/English, technical assistance, warranty service

Stages of export delivery:

Consultation and design (online, German/English) – 2–3 days
Approval of drawings and technical specifications – 1–2 days
Production at the plant in Zhitomir – 2 months
Preparation of export documents
Delivery to the Ukrainian border – 1–2 days.
Export customs clearance (Ukraine) – 1 day
Transit through Poland/Slovakia – 2–4 days.
Import customs clearance (Germany) – 1–2 days (from EUR.1 – simplified procedure)
Door-to-door delivery in Germany – 1–3 days.
Connecting communications (optional) – 4–8 hours

💡 Expert advice : For German clients, we offer cargo consolidation – if multiple items are ordered in one region, the shipping cost per unit is reduced by 20–30%.

❓ Answers to Frequently Asked Questions (FAQ)

❓ Is it possible to install a sauna in winter?

Yes . The design is designed for operation at temperatures from -30°C to +40°C. Installation is possible at any time of year.

❓ Do I need permission for installation?

For mobile structures up to 25 m² in area, a building permit is not required (according to the State Building Norms). For commercial use, approval from the State Emergency Service and the Sanitary and Epidemiological Service is recommended.

❓ How to care for thermally modified wood outside?

✅ Wipe with a damp cloth after heavy soiling
✅ Once every 3–5 years (optional) renew the Vidaron coating to maintain a rich color
✅ Avoid aggressive chemicals – use neutral soap solutions

❓ Is it possible to change the configuration?

Yes . We offer custom design: changing dimensions, adding a terrace, panoramic glazing, a smart sauna system, etc.

❓ Are tiles and plumbing fixtures included in the price?

No. The cement particle board under the tiles is already installed—the customer chooses and lays the tiles themselves, allowing them to control the design and budget. Plumbing fixtures (sink, shower, water heater) are also purchased separately.

❓ How does payment work?

✅ Advance payment : 30% to start production
✅ Interim payment : 40% after production completion (before delivery)
✅ Final payment : 30% upon delivery to the site
✅ Currencies : Hryvnia, Euro, US Dollar (at the NBU exchange rate on the day of payment)

🎯 Final conclusion: Invest in quality, get peace of mind

"Quality is not an expense, but an investment in long-term comfort."

The 7x2.7 m modular sauna from Thermowood Production isn't just a "box of planks." It's:

✅ An engineering-proven solution with a scientific approach to thermal modification and design
✅ Export platform with full support from design to installation in the EU
✅ Ecological product with a responsible attitude towards health and the environment
✅ A business partner with flexible terms, technical support, and profitability

5 reasons to choose this bathhouse :

Thermowood 215°C outside - stability, hygiene, durability 20-30 years.
Linden inside the steam room – hypoallergenic, tactile comfort, natural aromatherapy.
Fully prepared for operation - electricity, plumbing, fire protection, ventilation are already installed
Mobility - installation without a capital foundation, possibility of movement
Full package of documents – 5-year warranty, EN 14915, FSC, EUR.1 certificates for export

🏆 Expert verdict : If you're looking for more than just a sauna , but a reliable long-term solution that combines Ukrainian quality, European standards, and flexible service, the 7x2.7 m modular sauna from Thermowood Production is the best choice on the market in 2026. Germany is our priority market, and we are ready to provide you with impeccable service from factory to door.