Mobile Office 20ft

excl. VAT

What a 20ft mobile office unit is actually for

A 20ft mobile office unit is a small purpose built office building that can be craned onto a site, connected, worked in, and later lifted off and taken somewhere else. At 14 m² with a washroom and a kitchen area, it is designed as a place where people spend a working day, which is a very different brief from storage. That distinction drives everything that follows: light, air, temperature, power, quiet and security all have to work for people rather than for boxes.

How many workstations 14 m² realistically supports

Once you subtract the washroom and the kitchen area, the usable office floor is smaller than the headline figure. In practice a unit of this size works well as a one or two person office with room for a desk, a chair, a visitor seat and a filing or plan cabinet. Three people is possible for short periods, but circulation, noise and heat gain all suffer at once. Before committing, sketch the furniture at scale, allow for the entrance door swing and the washroom door, and leave a route to the exit that stays clear when someone pushes their chair back.

Storage is the item most often forgotten. Site offices accumulate drawings, samples, protective equipment, a printer and a first aid kit within weeks. Wall mounted shelving keeps the floor free. If the unit will hold a network cabinet, decide its position early, because it needs ventilation and its own supply.

Daylight, glare and screen work

Windows do two jobs that conflict with each other. You want daylight and a view out, and you do not want sun falling on a screen. A desk facing a window fights glare all afternoon. A desk with the window directly behind it puts the screen in silhouette. The usual answer is to set desks at right angles to the glazing and fit blinds that can be adjusted through the day. Ask what window sizes and positions the unit is supplied with, whether blinds are included, and whether positions can be changed at order stage, because moving a window afterwards is a structural and weathering job rather than a trim change.

Insulation and how a small building behaves

Full thermal insulation is on the recorded feature list. In a building this small the quality of that insulation matters more than it does in a house, because the ratio of external surface to internal volume is high: there is a great deal of wall and roof wrapped around very little air. A poorly insulated small office therefore overheats quickly on a sunny afternoon and cools quickly overnight in winter. Ask for the build up layer by layer, including the floor, and ask specifically how corners, the door threshold and the window reveals are treated, because those are where heat and draughts leave a compact unit.

Heating and cooling a small room full of equipment

Two people, a couple of computers, a printer and a kettle put a surprising amount of heat into 14 m². In winter that is helpful. From spring onwards it becomes a problem, especially with glazing on a sunny elevation. Energy efficient climate control is listed among the features, and the practical questions are which appliance, what its heating and cooling output is, where the outdoor unit sits, and how it is controlled. A reversible split unit is the common answer because it works in both directions. Ask how the condensate drain is arranged, and where the outdoor unit can be mounted without blocking access or troubling a neighbour.

Ventilation and air quality

An insulated, well sealed office needs deliberate ventilation. Air conditioning recirculates air, it does not necessarily bring in fresh air, and carbon dioxide builds up quickly in a small closed room with two people working in it. The options range from openable windows plus an extract fan, through trickle ventilation, to a compact mechanical ventilation unit with heat recovery. The washroom needs its own extract in any case. Ask what is fitted, and check that opening a window for fresh air does not mean throwing away the heat you have just paid for.

Power and data distribution for office equipment

Circuit planning for an office differs from a home. You want socket count and socket positions matched to where the desks actually go rather than spread evenly around the walls, and you want enough circuits that a kettle and a heater do not share a breaker with the computers. Sensible practice is separate circuits for lighting, general sockets, the kitchen area and the climate unit, with residual current protection and earthing arranged for a steel framed structure. Ask for the incoming supply rating and the type of connection, because that decides what can run at the same time.

Data deserves the same planning. Structured cabling to each desk position with a small patch point, plus a defined place for a router or a mobile broadband antenna, is far tidier and more reliable than cables draped across a floor. If the office will stand on a site with no fixed line, ask whether an external antenna bracket and a sealed cable entry are provided.

The washroom and kitchen area on a site with no facilities

The recorded features include bathroom facilities and a kitchen area, and on a site with nothing else those two small rooms carry a lot of weight. A washroom inside the building removes the daily walk to a portable toilet, provides somewhere to wash hands properly, and makes the unit usable when visitors or clients come. A tea point with a sink, a worktop and space for a fridge and a kettle keeps people on site through lunch instead of driving off.

Both need services. The washroom needs a water supply, a soil connection with fall, and extract ventilation. The kitchen area needs water, a waste connection and dedicated sockets. Where mains drainage is not available, a holding tank or a treatment arrangement takes its place, and both bring their own local approval questions. Frost protection matters as well: a small building left unheated over a cold weekend can freeze its pipes, so ask about trace heating or a simple drain down valve.

Acoustics and privacy for calls

Small offices are noisy in ways people do not anticipate. Two conversations inside 14 m² overlap constantly, a printer sounds loud, an extract fan drones, and rain on a lightweight roof can drown out a call. If confidential conversations will happen here, ask what the wall and door construction is, whether the washroom partition is insulated, and how much sound passes out through the window and the entrance door. Externally, ask where the outdoor fan of the climate unit sits relative to any window likely to be open.

Security and out of hours protection

An office holds laptops, instruments and paperwork, and it usually stands somewhere without a caretaker. Practical measures include a solid door with a good lock set, external shutters or bars at the windows, concealed or protected hinges, an alarm with battery backup, and external lighting on a sensor. Ask what is fitted as standard and what is an option. If the unit will stand empty for weeks, ask how to isolate the electrical supply and the water while keeping frost protection running.

Siting, levelling and the base it stands on

A relocatable building still needs a base. Common arrangements are concrete pads or blocks under the corners and intermediate bearing points, a compacted and levelled prepared surface, or a slab where the unit will stay for years. Whichever is used, level is what matters day to day: a unit set out of level shows it in doors that swing open on their own and a washroom that drains badly. Ask for the bearing point positions and the level tolerance required, and check ground bearing capacity where the ground is soft or recently filled. On exposed sites, ask about ballast or tie down against wind.

Relocation and what repeated moves do to a building

Moving between sites is the point of this type of building, and it is also what wears it out. Every move means disconnecting services, lifting, road transport and setting down again, and each cycle stresses the frame, the seals around openings and the internal finishes. Units that travel frequently tend to develop small cracks at wall junctions, doors that stick, and tired sealant at the roof upstand. None of that is fatal, but it should be inspected and made good between moves rather than ignored until it leaks.

Ask where the lifting points are, whether the unit can be craned fully fitted out or whether internal items must be secured first, and what handling method the manufacturer recommends. Ask also what documentation travels with the building, because a base and lifting drawing, the electrical test certificate and the appliance manuals make every new setup faster.

Temporary connections against permanent ones

How the office is connected depends on how long it stays. A short deployment might run from a temporary supply off a site distribution board, a water bowser or a site main, with a holding tank for waste. A long stay justifies a metered electrical supply, a permanent water connection and a proper drainage connection. The cost and the paperwork differ substantially, and connection applications are handled locally, so start them early. Whichever route you take, commissioning is the same: pressure test the plumbing, test and certify the electrical installation, prove the heating and ventilation, and take a handover pack with drawings, certificates and manuals.

A purpose built office module against a converted steel box

A converted shipping container and a purpose built office module can look similar from the outside and behave very differently inside. A cargo box was made to carry freight, so its steel skin is a continuous thermal bridge with a lining added afterwards, condensation on the inner face of the steel is a recurring complaint, and every window and door has to be cut into a structural skin and reinforced. A module such as a 20ft mobile office unit is designed around its insulation from the start, with framing that already accommodates openings, services routed inside the wall build up, and an insulated floor rather than a deck laid over cold steel. Both approaches have a place, and conversion can be cheaper up front, but for year round occupied working conditions the purpose built route usually gives better comfort at lower running cost.

Maintenance, lifecycle and where the cost sits

Maintenance is straightforward and mostly about water and movement. Check the roof and its outlets, the sealant around windows, door and roof upstands, and the condition of any exposed steelwork and its paint. Clean the climate unit filters, keep the condensate drain clear, and service the unit annually. Flush and check the washroom before and after any long period standing empty.

On cost, the building itself is the predictable part. The variable money goes on the base and levelling, transport distance, crane hire, connections and the distance to them, security fitout, and the specification of the climate unit and internal finishes. Ask for those as separate lines so you can see what a change of site or a longer stay really costs.

Regulatory points to confirm locally

Planning and building requirements for a relocatable office vary by federal state and by municipality, and treatment often differs according to whether the unit is classed as temporary or permanent on that plot. Workplace, fire safety, sanitary provision and accessibility expectations for commercial use also differ by location and by how the building is used. Confirm the position with your local building authority before ordering a 20ft mobile office unit, and ask the supplier which drawings and documents they can provide to support an application.

How many people can work in a 20ft mobile office unit?

One or two people comfortably. The 14 m² figure includes the washroom and the kitchen area, so the desk space itself is smaller. Two workstations, a visitor chair and a cabinet fit without crowding. A third person is workable for short spells but pushes up noise, heat and traffic through the room. Plan the furniture layout at scale before ordering rather than after delivery.

Does it need mains water and drainage, or can it run temporarily?

Both are possible. For a short deployment, a temporary electrical supply, a water tank or site main and a holding tank for waste are common. For a long stay, a metered supply, a permanent water connection and a drainage connection make more sense and usually cost less to run. Connection applications are made locally, so start them well before the unit arrives.

How is a small office kept comfortable in summer?

Three things together. Insulation and shading keep heat out, a reversible climate unit sized for the room removes what gets in, and ventilation brings fresh air so the room does not go stale. Equipment and people add real heat to a space this small, so the cooling output and the window orientation both matter. Ask what unit is fitted and where its outdoor part is mounted.

What is the difference from a converted shipping container?

A cargo box is a structural steel skin with insulation added inside, which leaves thermal bridges and a tendency to condensation, and openings have to be cut and reinforced. A purpose built office module is designed around the insulation, with framing that already allows for windows and doors, services in the wall build up, and an insulated floor. Comfort and running costs usually favour the purpose built approach.

How often can the unit be relocated?

Relocation is normal for this type of building, but each move stresses the frame, the seals around openings and the internal finishes. Buildings that travel often show sticking doors, hairline cracks at wall junctions and tired sealant. Inspect and make good between moves, keep the lifting and base drawings with the unit, and ask the supplier what handling method they recommend.

What should the quotation state before ordering?

The wall, roof and floor build up with insulation thickness, window sizes and positions, the internal height, the climate unit and its output, the incoming supply rating with a circuit schedule, data provision, the washroom and kitchen specification, the required base and bearing points, lifting arrangements, security fitout, commissioning scope and the warranty terms.