Sanitary Units – Modular Welfare & WC Containers

Factory-built sanitary units and welfare cabins with toilets, washbasins, showers and changing areas – designed for construction, industrial, education and event sites across the UK.

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MS10 welfare cabin compact sanitary and welfare unit

MS10 Welfare Cabin

size 10ft x 8ft
compact welfare / sanitary cabin

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MS20 welfare cabin standard sanitary and welfare container

MS20 Welfare Cabin

size 20ft x 8ft
standard welfare / sanitary cabin

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MS20-02 welfare cabin alternative sanitary layout

MS20‑02 Welfare Cabin

size 20ft x 8ft
alternative sanitary / welfare layout

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MS20-03 welfare cabin extended sanitary and welfare space

MS20‑03 Welfare Cabin

size 20ft x 8ft
extended welfare cabin layout

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MS20-23 welfare cabin male and female sanitary container

MS20‑23 Welfare Cabin

size 20ft x 8ft
male / female sanitary welfare cabin

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MS20-28 welfare cabin large sanitary and welfare block

MS20‑28 Welfare Cabin

size 20ft x 8ft
large welfare cabin with sanitary block

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MS20-MSK welfare cabin with canteen and sanitary space

MS20‑MSK Welfare Cabin

size 20ft x 8ft
welfare cabin with canteen and sanitary area

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MS20-MU welfare cabin with changing and drying room

MS20‑MU Welfare Cabin

size 20ft x 8ft
welfare cabin with changing / drying room

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MS20K-MU welfare cabin with kitchen and sanitary facilities

MS20K‑MU Welfare Cabin

size 20ft x 8ft
welfare cabin with kitchen and sanitary area

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MS20-MSKP welfare cabin for weekly hire with sanitary facilities

MS20‑MSKP Welfare Cabin

size 20ft x 8ft
welfare cabin with sanitary facilities for weekly hire

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MS20-MSKZ welfare cabin sanitary and welfare unit for sale

MS20‑MSKZ Welfare Cabin

size 20ft x 8ft
welfare cabin with integrated sanitary and welfare space

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Modular Sanitary Units for Demanding Sites

KC Modular Buildings supplies a complete range of modular sanitary units and welfare cabins based on our ISO frame systems. Each unit is factory-built, fully insulated and delivered ready to connect to your site services, providing reliable toilets, washbasins, showers and changing areas wherever you need them.

Whether you are running a large construction site, an industrial facility, a school campus or a temporary event, our sanitary units are designed to cope with intensive daily use, tough weather conditions and strict hygiene requirements. Units can be used standalone or combined with office and welfare modules to create a complete modular complex.

Sanitary Unit Range

Our ISO frame sanitary units are available in several standard configurations and can be customised to suit your project. Below is an overview of the most popular types.

WC Units

Compact toilet cabins with individual WC cubicles and washbasins, ideal for smaller sites, events or as an add-on to existing modular buildings.

  • 1–6 WC cubicles per unit
  • Washbasins with mixer taps and mirrors
  • Mechanical or gravity ventilation
View technical specification

Shower & Changing Units

Shower cabins with changing benches and hooks, designed for construction sites, sports facilities and industrial applications where staff need to wash on site.

  • Individual shower cubicles with trays and curtains/doors
  • Changing benches and coat hooks
  • Non-slip PVC flooring with floor drains
View technical specification

Combined WC & Shower Units

Mixed sanitary units combining toilets, washbasins and showers in one container, optimised for medium and large sites with higher headcount.

  • Separate WC and shower zones
  • Wash troughs or individual basins
  • Options for male / female separation
View technical specification

Male / Female Sanitary Units

Units with fully separated male and female sections, such as our MS20‑23 welfare cabin, providing compliant sanitary facilities for mixed teams.

  • Dedicated entrances for each section
  • WC, washbasins and urinals (male)
  • WC and washbasins (female)
View MS20‑23 sanitary welfare cabin

Technical Specification – ISO Frame Sanitary Units

Dimensions

Standard sanitary units are based on ISO container footprints (e.g. approx. 6058 x 2438 x 2800 mm), with internal clear height around 2500 mm. Multiple units can be combined or stacked to create larger sanitary blocks.

Steel Structure

  • Load-bearing steel frame in EXC2 class according to PN‑EN 1090‑1
  • Cold-formed steel profiles welded to PN‑EN ISO 3834‑2
  • Shot-blasted to Sa 2.5 (PN‑EN ISO 8501‑1) and spray-painted in a controlled booth
  • ISO-standard corner castings for lifting and transport
  • Stackable up to three storeys (subject to design and foundations)

Roof, Walls and Floor

  • Insulated multi-layer roof with mineral wool and sandwich panels
  • External walls in insulated sandwich panels with steel skins (e.g. RAL 7035 / RAL 9010)
  • Internal partitions in sandwich panels or laminated boards for WC cubicles
  • Floor build-up with mineral wool insulation, cement-particle board and galvanised steel underside
  • 2 mm PVC safety flooring, hot-welded and coved up the wall for hygiene
  • Typical floor load capacity around 200 kg/m²

Windows and Doors

  • White PVC windows with tilt function and obscure double glazing (U ≈ 1.1 W/m²K)
  • Insulated steel external doors with locks and euro cylinders
  • Internal WC doors in laminated board with appropriate sanitary hardware

Electrical Installation

  • Complete electrical installation with distribution board
  • LED lighting with IP65-rated fittings in sanitary areas
  • 230 V socket outlets for maintenance and cleaning equipment
  • External power connection via industrial plug and socket (e.g. 5x32 A)
  • Earthing of the steel frame for safety

Sanitary Installation

  • Surface-mounted hot and cold water installation in PP pipes
  • Surface-mounted PVC waste installation with floor or wall outlets
  • Equipment options: WC pans, urinals, washbasins, wash troughs, shower cabins, floor drains
  • Electric or other water heaters sized to the number of fixtures

Ventilation and Heating

  • Mechanical extract fans and/or ventilation grilles in WC and shower zones
  • Electric convector heaters or panel heaters for year-round comfort

Where Our Sanitary Units Are Used

Construction & Civil Engineering

Sanitary units for main contractors, subcontractors and infrastructure projects, providing compliant welfare facilities in line with CDM regulations.

Industrial & Logistics Sites

Permanent or semi-permanent sanitary blocks for factories, warehouses and logistics hubs, with robust finishes and easy cleaning.

Education & Sports Facilities

Additional toilets and showers for schools, colleges, sports clubs and training centres, delivered as modular extensions to existing buildings.

Events & Temporary Installations

Higher-quality alternatives to chemical toilets for festivals, events and temporary accommodation sites, with proper plumbing and drainage.

Explore the exterior and interior of the MS20‑23 sanitary welfare cabin, a robust modular unit with separate male and female sanitary areas for construction and industrial sites.

MS20-23 sanitary cabin exterior view on construction site
Exterior view of the MS20‑23 sanitary cabin, a steel‑framed welfare unit for construction and industrial sites.
MS20-23 sanitary welfare cabin with insulated steel walls and PVC floor
Interior of the MS20‑23 sanitary welfare cabin with insulated steel walls and easy‑clean PVC safety flooring.
MS20-23 sanitary cabin interior with toilets, washbasins and urinals
Interior of the MS20‑23 sanitary cabin showing toilets, washbasins and urinals in separate sanitary zones.
MS20-23 sanitary welfare cabin with male and female toilets, washbasins and urinals on a construction site
MS20‑23 sanitary welfare cabin with separate male and female areas, complete with toilets, washbasins and urinals.

Sanitary Units – Frequently Asked Questions

Do sanitary units need mains connections?

Yes. Our sanitary units are designed to connect to your site’s water, waste and electrical systems. In some cases, they can be paired with holding tanks and pumps where gravity drainage is not available.

Can sanitary units be combined with offices and welfare cabins?

Absolutely. ISO frame sanitary units can be linked with office, canteen and changing room modules to create a complete modular welfare complex.

Are the sanitary units suitable for year-round use?

Yes. All units are insulated and fitted with heating and mechanical ventilation, making them suitable for year-round operation in UK conditions.

Can you customise the internal layout?

We can adapt the number of WCs, urinals, washbasins and showers, as well as the male/female split, to suit your headcount and site requirements.

Request a Sanitary Unit Proposal

Tell us how many people you need to serve, how long the sanitary units will be on site and whether you need male/female separation, showers or changing areas. We will propose the most efficient modular sanitary solution for your project.

  • ISO frame sanitary units for construction, industrial, education and events
  • WC, shower, combined and male/female configurations
  • Fast delivery, factory-tested installations, minimal site disruption

Call 07443 564 451 Email drawings and requirements Send details via contact form

Why Choose KC Modular Buildings for Sanitary Units?

Factory-Built Quality

All sanitary units are manufactured in controlled factory conditions, with consistent quality, tested installations and reduced on-site risk compared to traditional builds.

Fast Delivery & Installation

With pre-installed electrics and plumbing, sanitary units arrive ready to connect. This keeps disruption to a minimum and allows you to get welfare facilities operational quickly.

Flexible Configurations

From compact WC cabins to larger male/female sanitary blocks with showers and changing areas, layouts can be tailored to your headcount and site constraints.

Durable & Easy to Clean

PVC safety flooring, robust wall finishes and high-quality fixtures are selected for intensive daily use and straightforward cleaning on busy sites.

Sanitary units are often installed alongside other modular buildings to create complete welfare and office complexes. Explore related ISO frame systems: