Custom Sauna, Hammam & Spa Contractor in Boston

US Base & USD Contracts

A US base in Boston with USD contracts and invoicing, and a single point of contact from design through to commissioning.

US-Code Engineering

Every installation is built with UL/ETL-listed components and engineered to the National Electrical Code (NEC), International Building Code (IBC) and ADA requirements.

In-House Manufacturing

From 3D design and technical documentation to custom marble and premium Nordic woods — one team from concept to handover, backed by a 24-month warranty.

Supply and supervision — not a resident install crew

Our Boston office at 66 Long Wharf is a commercial, design and project-management base. We supply the cabin, the plant and the complete technical package — shop drawings, submittals, load schedules — and installation is executed by your licensed local contractor: a Massachusetts-licensed electrician and plumber, plus the waterproofing trade, working to our drawings. Our own engineers attend for set-out, supervision of the critical stages and final testing and commissioning. We do not employ a resident installation crew in North America and we do not hold a US contractor's licence, and we would rather say so at enquiry stage than at inspection stage.

Which code your Massachusetts project is actually inspected against

The governing document is the Massachusetts State Building Code, 780 CMR, 10th Edition, effective 11 October 2024 and based on the 2021 I-Codes; Chapter 51 adopts the 2021 IRC for residential work. Electrical work follows 527 CMR 12.00, which adopts the 2026 National Electrical Code with effect from 24 April 2026 — worth checking against, because secondary code mirrors online still show the 2023 text. In Boston itself, the permitting authority for building, electrical, plumbing and gas is the Inspectional Services Department, under M.G.L. c.143 §§3 and 3A.

Two licences are not optional on our kind of work: a Massachusetts-licensed electrician (M.G.L. c.141 §3) and a Massachusetts-licensed plumber (c.142 §3, 248 CMR 10.00). On listing, there is no Massachusetts-specific rule forcing a particular testing laboratory — 527 CMR 12.00 Rule 6 is permissive — but the hard requirement sits in federal law at OSHA 29 CFR 1910.303(a) and 1910.399, which is why we specify UL- or ETL-listed equipment rather than relying on a CE mark.

Listed components, because the inspector will look

Everything electrical that goes into a US project is specified as UL- or ETL-listed — heaters, controls, lighting and steam plant. A European CE mark is not a North American listing, and an inspector here looks for the listing mark on the equipment itself; it is a common reason an imported sauna fails a first inspection. We select the listed variant at quotation stage rather than substituting later, and the submittal package names the listing on every item so the reviewing authority can check it without calling us.

New England's real design case is the cold, not the heat

ASHRAE's 0.4% summer design dry-bulb at Boston Logan is 32.7 °C — mild by our standards, and cold-plunge chiller selection is straightforward here. The engineering effort goes the other way. An outdoor sauna, cold plunge or cold-water circuit in New England needs freeze protection that a Gulf or Mediterranean design never carries: heat-traced and insulated pipework, a drain-down route for seasonal shutdown, frost-resistant substructure detailing, and glazing and door hardware selected for repeated freeze-thaw. We design that in from the first drawing rather than adding it after the first winter.