Modern Methods of Construction (MMC) covers a set of building techniques — from panellised systems to fully volumetric 3D modules — that move construction work from the site into a factory. Within the MMC framework used by Homes England and the NHBC, volumetric modules assembled off-site and craned into position sit in Category 1, the most complete form of offsite manufacturing. Bathroom pods are one of the most mature and widely adopted Category 1 products in the UK and European market today.
The reason bathroom pods lead the MMC conversation is structural: a bathroom is the single most trade-intensive room in a building relative to its size. A traditional ensuite requires first-fix plumbing, electrics, waterproofing, tiling, sanitaryware installation, second-fix MEP and snagging — all inside a room that might be 2.5 m². Multiply that across a 300-room hotel or a 500-bed student scheme, and the bathroom becomes the critical path item on the programme.
Why the construction sector is adopting MMC now?
Three pressures are pushing developers and contractors toward MMC faster than at any point in the last decade. The first is labour: the UK construction sector has reported a persistent shortage of skilled trades, particularly in plumbing, tiling and electrical installation, which makes sequencing multiple wet trades across dozens of identical rooms increasingly difficult to resource reliably. The second is programme certainty: lenders and operators increasingly price in the risk of late snagging on repeated rooms, and offsite production reduces that exposure. The third is quality control: a factory environment allows dimensional checks, pressure testing and finish inspection before a unit ever reaches site, rather than relying on trade-by-trade sign-off in variable site conditions.
Bathroom pods answer all three pressures directly. A pod is manufactured as a complete three-dimensional unit — chassis, waterproof floor tray, wall panels, pre-installed mechanical and electrical systems, sanitaryware and finishes — in a factory, then transported to site and lifted or rolled into position. The remaining site work is limited to structural openings, service connections and interface sealing, rather than a full trade sequence per room.
What this looks like at scale?
The commercial case for MMC strengthens with repetition. A single bespoke bathroom pod carries the full cost of design, prototyping and production setup. A scheme with 300 or 400 identical pods spreads that cost across every unit, while giving the design team a single prototype to approve before the whole production run starts. Domczar, a Polish manufacturer of prefabricated bathroom pods operating under ISO 9001 and ISO 14001, delivered 457 bathroom pods for a hotel scheme in Dublin and 362 units for a hotel in Warsaw in 2025 — both projects where the bathroom was the most repeated, most trade-dense room type in the building. With an annual production capacity of 9,000 units, this kind of factory-based delivery is now a standard part of the MMC toolkit for hotel, residential and student housing developers across Europe, not a niche experiment.
For architects and contractors evaluating where to start with offsite construction, bathrooms are usually the lowest-risk, highest-return entry point: the room is self-contained, its interfaces with the rest of the building are well understood, and the quality argument is easy to demonstrate to a client. A closer look at what bathroom pods are and how they’re manufactured, installed and specified is a useful starting point for any team assessing whether MMC is right for their next scheme.
About Domczar: Domczar is a European manufacturer of prefabricated bathroom pods for hotels, student accommodation, residential and healthcare projects, based in north-eastern Poland with an annual production capacity of 9,000 units.
