Modified Containers

Modified containers and portable modular buildings: site offices, welfare and toilet units, security cabins and container bars, ready to use or built to suit your project.

Modified containers and portable modular buildings: site offices, welfare and toilet units, security cabins and container bars, ready to use or built to suit your project.

Condition
Size
Height

Container Bar

A shipping container structure with premium finishes in polished concrete and wood panelling. Request your quote for a specific project

Sanitary module

The prefabricated sanitary module is an approved, practical solution designed to provide sanitary facilities for up to 20 people. Ideal for building sites, camps, events and temporary spaces, this prefabricated module stands out for its quick installation, durability and regulatory compliance.

Office module 6M

The 6-metre prefabricated office module is the standard model most widely used in site offices and construction projects. Its assemblable and stackable design makes it possible to optimise space and extend facilities practically and efficiently. The ideal size for comfortable, functional modular offices that install quickly.

Office module 3M

The prefabricated office module is the ideal compact solution for urban building sites and confined spaces. At 3.70 metres long, this portable module fits easily into any city site, offering practicality, functionality and quick installation.

Security module

It has 3 strategically placed windows offering a 270° panoramic view, ideal for security posts, access control, site entrances and security on plots or premises.

Modified containers

Ready-to-use spaces with no building work

A modified container is a shipping container or a steel-framed portable modular unit converted for a specific use: an office, a toilet block, a security cabin, a bar, a changing room or a workshop. It arrives fully assembled, with electrics, insulation and finishes, and is set in place in a few hours by crane truck.

It is the fastest way to get a functional space on a construction site, at a warehouse, an event or a farm, with no major building permits or construction timescales. Choose from standard models ready for delivery or bespoke projects.

  • Thermal insulation in the walls, roof and floor.
  • Electrical installation with consumer unit, sockets and lighting.
  • Windows with security bars or shutters, and a security door.
  • Several units can be joined together for more floor space.
6 metre portable office cabin
Ready to use
Delivered fully assembled
2.5–12 m
In length
Made to measure
If your project calls for it

Unit dimensions

External dimensions and use of each modular unit
UnitDimensions (L × W × H)Approx. floor areaIdeal for
3 m office3.70 × 2.40 × 2.60 m~9 m²A single workstation, urban sites
6 m office6.00 × 2.40 × 2.60 m~14 m²Site office, 2–4 workstations, meetings
Toilet block2.50 × 2.40 × 2.60 m~6 m²Construction sites and events, up to 20 people
Security cabin2.50 × 2.40 × 2.60 m~6 m²Access control and security
Container bar6.00 or 12.00 × 2.40 × 2.60 m14–29 m²Hospitality, terraces, festivals

For construction sites, compare models on our site cabins and site offices page.

How we build a modified container

  1. Tell us how you will use it

    What activity will take place inside, how many people, where it will be placed and whether you want to buy or rent.

  2. Proposal and quote

    We choose the standard unit that fits, or we propose the layout, equipment and finishes for a bespoke project.

  3. Fabrication

    We prepare the unit with insulation, electrics, doors and windows and, if needed, plumbing, ready to connect.

  4. Delivery and positioning

    We deliver it by crane truck and set it in place on a firm, level base.

Advantages over traditional construction

Speed and flexibility

A standard unit is delivered ready to use and a bespoke one is built in weeks, not months. When the project or event ends, it can be moved to another site or sold.

  • No groundworks beyond a level base.
  • Reusable across several sites.
  • Expandable by joining several units.

Controlled cost

The price is fixed from the start, with no building surprises. If you only need it for a while, rental avoids the upfront investment.

  • Fixed quote with transport included.
  • Buy or rent depending on how long you need it.
  • Durable, low-maintenance steel structure.

Frequently asked questions about modified containers

What is a modified container?

It is a shipping container or a steel-framed portable modular unit converted for a specific use: an office, toilet block, changing room, security cabin, bar or workshop. It arrives insulated, with electrics and finishes, ready to use.

What is the difference between a portable modular unit and a converted shipping container?

A portable modular unit is built from the outset as an occupiable space, with dimensions and panels designed for that purpose. A converted shipping container starts life as a freight container and keeps its very strong Corten steel structure. We recommend one or the other depending on the use.

Do I need planning permission for a portable cabin?

It depends on the municipality, the land and how long it will be installed. On construction sites the permit for the works itself is usually enough; for permanent installations it is best to check with your local council. We can advise you on the unit’s documentation.

Do the units come with electricity and water?

All of them have an electrical installation with a consumer unit, sockets and lighting, ready to connect. Toilet blocks and units with a kitchen or washbasin also include plumbing to connect to the mains or a water tank.

Can several units be joined together?

Yes. They can be placed side by side or stacked to create larger offices, changing rooms with toilets or complete site welfare set-ups.

How long does it take to get a modified container?

Standard models in stock are delivered within a few days. A bespoke project depends on its complexity: we give you the build time together with the quote.

Can office units and toilet blocks be rented?

Yes. For construction sites and events, rental is the most common option. If you will use the unit for years or on several projects in a row, buying usually pays off.

Do you build bespoke modified containers?

Yes. As well as our standard models, we convert containers into canteens, changing rooms, workshops, shops, classrooms or hospitality spaces. Tell us your idea and we will prepare a proposal.

Have a project in mind?

Tell us what space you need and where, and we will send you a proposal with the unit, equipment and transport included.

Adrián Marengo, founder of Mar Containers