Containex 20ft x 8ft Office Portable Modular Building

Versatile | Insulated | Ready to Work

Looking for a clean, comfortable, and professional modular building that’s ready for work from day one? Meet MSS3150 – our brand new 20ft x 8ft Containex portable office unit, designed with flexibility and functionality in mind.

Built around a solid external steel frame and finished with composite galvanised wall and ceiling panels, this high-quality modular building is fully insulated with PU60 foam insulation – helping to keep your space warm in winter and cool in summer.

Inside, you’ll find everything needed to create a smart, plug-and-play office environment:

✅ 2x uPVC fully opening windows, each complete with secure lockable steel shutters
✅ 1x fully lockable external door, designed for strength and security
✅ RCD protected consumer unit providing safe and reliable power for lighting, sockets, and heating
✅ 2x batten lights to ensure bright, even lighting throughout
✅ 2x double plug sockets (2-gang)
✅ 1x wall-mounted convector heater to keep things comfortable
✅ Durable vinyl floor covering for easy cleaning and a professional look
✅ 32amp blue plug and play power connection for quick and hassle-free setup

Flexible Layout Options

We understand that every site and every business is different. That’s why door and window positions can be adjusted to suit your individual needs. Whether you’re using this as a site office, sales cabin, staff welfare space, or a temporary expansion to your existing premises, this modular unit offers the versatility to adapt.

Scalable and Stackable

Need more than one? These buildings can be linked or stacked to create multi-room or multi-storey configurations. They can even be stacked directly on top of a shipping container using a stacking plate. We also supply 13 tread staircases for upper-level access if required.

Why Choose Monnow Site Services?

At Monnow Site Services, we bring over 45 years of expertise to the portable building industry. As a technical partner with Containex, we offer a broad range of their containers, combining superior quality with outstanding customer service. Our offerings include:

• Consultation and Design: Assisting you in choosing and customising the ideal container for your needs.
• Delivery and Installation: Efficient logistics and professional installation for a seamless experience.
• Maintenance and Refurbishment: Keeping your containers in top condition with our expert care.