Most project managers order a modular site office exactly once per project, under time pressure, and find out at delivery what they should have asked at quotation. The unit is too small for the site team, the meeting room is missing, the toilet block was assumed to be included and is not, or the crane the supplier expected turns out not to exist on site. This guide is written for contractors, EPC teams, mine operators and camp managers who need to buy one or more site offices and get the specification right the first time. By the end you will be able to fix five decisions: how many people the office must hold, which unit type fits, which layout to order, what your site can actually receive, and what to put in the RFQ so quotes come back comparable. Every figure used here comes from published product pages and guides on this site; where a number depends on the project, it is marked as such.
A modular site office is a prefabricated building unit, manufactured in a factory and delivered to a construction site, mine, oilfield or industrial camp to house the project's administrative work. On this site the standard platform is a flat-pack module with an external frame of 6,055 x 2,400 x 2,896 mm - a 20-foot-class module, not a shipping container itself - and this size is published across our site office product pages. The factory scope covers the structural frame, wall and roof panels with glass-wool insulation, PVC flooring, doors and windows, and concealed electrical systems as listed in each product specification table; the modules ship flat-packed and are assembled on site with bolted connections, while connection to site power, water and sewage remains a site-side task. Because the module size is standardized, one office can be a single 20-foot-class unit, part of a larger complex, or one of the published two-storey layouts - each configured per the confirmed shop drawings. That standardization is the main reason project teams choose modular over timber or local site-built sheds: the same module type can be quoted, shipped, craned and later resold or relocated with predictable results.
Sizing errors almost always come from starting with the catalogue instead of the headcount. Before comparing any model, write down four numbers and one sentence:
A common pattern for a 6-10 person site team is one unit with an open workstation area plus a partitioned meeting room. A 10-20 person team typically splits into separate office units plus a dedicated meeting or administration unit. Above that, or when welfare is in scope, a multi-unit complex or a two-storey administration building is usually the economical answer. These are typical planning examples drawn from published configurations, not capacity standards; final occupancy per unit is determined by the actual floor plan, furniture layout, circulation space, meeting-room usage, local workplace requirements and fire-escape conditions.
Three published configurations on this site cover most site office requirements. They share the same 6,055 x 2,400 x 2,896 mm module size; combining units into a complex, and which units combine, is configured per the project shop drawings rather than assumed.
| Configuration | What it holds (typical) | Fits when |
|---|---|---|
| Single-unit site office | Open workstations plus a partitioned meeting room in one 20-foot-class footprint unit | Small site teams, supervisor cabins, one-unit sites |
| Two-storey administration building | Doubled floor area on the same footprint; offices and meeting space across two levels | Tight sites where land area, not budget, is the constraint |
| Multi-unit office complex | Private offices, open workstations, meeting rooms, plus welfare rooms such as rest areas, lockers and changing rooms, linked by corridor units | Head offices of camps and EPC projects where admin and welfare share one complex |
The table describes typical configurations, not universal specifications; the exact room count, partition positions and window placement of each model follow the product drawings. To see how these translate into actual models: a single-unit option with a meeting room is published on the remote project site office with meeting and welfare rooms page. For constrained plots, the two-storey camp administration and office building doubles usable area without doubling land take. For full camps, the modular construction site office complex for overseas projects page shows the corridor-linked, welfare-inclusive layout. Where the office sits inside a wider oilfield or industrial camp, the oilfield camp office and staff accommodation modules page covers that case.
Two selection rules keep this phase honest. First, decide welfare scope once and write it into the RFQ - the most frequent quote mismatch comes from one supplier pricing toilets inside the office complex and another assuming separate sanitation units. Second, if the office will move between sites during its life, say so before quotation; relocation affects the foundation detail, the services connection method and the corrosion specification you should ask about.
When the headcount sits between the single-unit and complex configurations, the single-versus-two-storey call comes down to three site facts rather than price. Measure the plot first: if the compound has the footprint for two units side by side, two single units are simpler to place, phase and later resell separately. If the plot is tight - compounds inside plants, yards behind existing buildings, urban logistics depots - the two-storey building recovers the second floor within the same 20-foot-class footprint. Check the handling second: a stacked building needs the lifting plan confirmed for the assembled weight at height, which your crane provider signs off against the drawings. Check the people last: stairs change who can work on the upper floor, which matters where workforce rules or client audits set requirements on access. When all three facts are comfortable, the two-storey layout can reduce land take because one foundation area serves two floors - but it also adds stair and structural design, lifting and erection conditions, and local compliance items that two single units do not have, so which layout costs less depends on the project's drawings, ground and crane conditions. Run the sequence in order for every site rather than assuming either answer.
A correctly chosen unit still fails if the site cannot receive it. Four checks, in the order they usually bite. Each of them is confirmed against project drawings, site data and the people responsible on site - none of them is closed by a supplier's web page:
Lead time deserves one honest sentence. The product pages list 10-15 days for this platform class, which is the production period stated per order - not a door-to-site delivery date. Transport time and on-site assembly time are additional and are confirmed separately, and actual schedules for multi-unit or customized orders follow the order confirmation, because quantity, configuration and shipping destination all move the date. Treat any supplier who quotes a firm calendar date before seeing your specification with caution.
Three quotes rarely differ because one factory is cheaper; they differ because each factory priced a different scope. Before comparing numbers, align the quotes on four points: identical configuration (same layout, same partition count, same window and door schedule), identical delivery scope (ex-works, FOB or CIF, and to which port), identical installation responsibility (who sends the assembly crew or supervisor, who pays local labour), and identical documentation (drawings, packing lists, material certificates). Our guide on what should be included in a prefab house quotation lists the line items to demand before you compare prices. When shortlisting factories rather than quotes, the eight checks before you order from a container house factory in China apply to site offices exactly as they do to accommodation units.
A complete RFQ for a modular site office contains seven blocks. Incomplete RFQs get incomplete quotes - the price comes back fast and the surprises arrive with the container.
| RFQ block | What to state |
|---|---|
| 1. Function and headcount | Office use, peak simultaneous users, private rooms and meeting capacity required |
| 2. Quantity and configuration | Number of units, single or two-storey, welfare rooms in or out of scope, corridor links if any |
| 3. Site conditions | Destination country and site location, ground type, unloading equipment available, access route limits |
| 4. Climate and code inputs | Temperature range, wind and snow expectations, and any local documentation the building must support - final compliance sits with local review |
| 5. Services scope | Electrical fit-out level, plumbing scope, HVAC expectation, and what the site provides at the interface |
| 6. Commercial terms | Incoterms, destination port, target order date, expected relocation or resale during use |
| 7. Documentation needed | Drawings, material specifications, packing lists and inspection records you require before shipment |
Use the same RFQ text with every shortlisted supplier so the answers are comparable line by line. Note that submitting an RFQ starts a conversation, not a commitment: lead time, compliance and site suitability are confirmed during quotation and order, not at the form.
For convenience, here is a short template that maps to the seven blocks above - copy it, replace the bracketed fields, and send it to each shortlisted supplier:
Subject: RFQ - Modular site office, [project name] Hello, Please quote on the following: 1. Function: site office for [construction / mining / EPC] project; [N] simultaneous users, [N] private offices, meeting room for [N] people. 2. Quantity and configuration: [N] unit(s), [single unit / two-storey / multi-unit complex with welfare rooms]. 3. Site: [country], [city or region]; ground type: [ ]; unloading equipment available: [crane / forklift / none]. 4. Climate: temperature range [ ] to [ ] C; wind or snow notes: [ ]; local documentation required: [yes/no]. 5. Services: electrical fit-out [standard / custom]; toilets and showers inside scope: [yes/no]; site provides [power / water / sewage] at the interface. 6. Commercial: Incoterms [EXW / FOB / CIF]; destination port [ ]; target order date [ ]; relocation during use: [yes/no]. 7. Documents required: layout drawings, material lists, packing lists, inspection records. Please reply with an itemized quotation, listing configuration, delivery scope and installation responsibility separately. Best regards, [Name] / [Company]
Knowing the sequence helps you judge which supplier is actually in control. After an RFQ with the seven blocks above arrives, the supplier confirms the configuration and returns a quotation - with a complete RFQ this is a specification exercise, not a guessing game. Once an order is placed, production drawings for the agreed layout are prepared and issued for your confirmation; this is the last cheap moment to change partition positions, window counts or door swings, so review the drawings against your headcount list rather than approving them unread. Production follows the factory's inspection flow, and the documents you listed in RFQ block 7 - drawings, material specifications, packing lists, inspection records - are prepared against the order. Loading is planned per the shipment: for flat-pack platforms the published loading guide explains the knock-down packing logic and how many units of each system load into a 40HQ container, and the exact loading plan for your office configuration is confirmed against the model files before the container is stuffed. After arrival, the site receives the unit against the delivery scope line in the quotation - this is where the Phase 4 alignment pays off, because both sides are working from the same list of what is included.
The factory price of a site office is one block of the landed cost, not the total. The blocks buyers most often leave out of the comparison: ocean freight and destination-port charges; inland transport from port to site; the crane or handler on delivery day; foundation materials and any local groundworks labour; connection of power, water and sewage at the site interface; and assembly labour for the knock-down panels. Who owns each block is set in the quotation, which is why Phase 4 asks you to align the delivery and installation scope before comparing numbers.
How many people fit in one modular site office? The published single-unit configuration holds an open workstation area plus a partitioned meeting room within the 6,055 x 2,400 x 2,896 mm module, which suits small site teams. The exact headcount depends on the actual floor plan, furniture and circulation layout, meeting-room usage and your country's workplace and fire-escape rules, so confirm against the model drawing rather than a general rule.
Can a site office have toilets and showers inside? Welfare rooms - rest areas, lockers and changing rooms - are an explicit part of the office complex configuration published on this site, and sanitation fit-out follows the model selected and the quotation scope. Shower and toilet fit-out levels therefore vary by model: state this in the RFQ rather than assuming it is standard.
How long does a site office take to deliver? The product pages list 10-15 days production time for this platform class per order. Transport and on-site assembly take additional time and are confirmed separately, and the schedule for multi-unit or customized orders is the one stated in your order confirmation.
Is a two-storey site office safe? The two-storey configuration is a published model built on the same standardized module, with structural drawings issued per order. Its safety for your project depends on the specific model, the load conditions it is engineered for, and local review of those drawings by a qualified engineer - covering, among other inputs, wind, snow and seismic requirements where they apply. A web page cannot substitute for that sign-off.
Can the office be moved to a second site? Relocation is possible only as far as the specific product design, the handling conditions at both sites and the unit's condition allow. Whether a unit can take a second move depends on how it was founded and connected, the lifting and road-transport conditions of the new site, and the actual state of the structure and finishes after its first service period - all reviewed against the supplier's drawings before the move is planned, not assumed afterwards.
Can the layout be customized? Yes - models on this platform are produced to supplied drawings, and the published product pages list color as customizable. Partition positions, window and door placement and fit-out level are confirmed on the production drawings during the order, within what the platform's structural system supports, which is why RFQ block 2 asks for your layout requirement up front.
Do site offices arrive furnished? The published specification tables define the building scope - structural frame, insulated wall and roof panels, PVC flooring, doors and windows, and concealed electrical systems - with color and fit-out options confirmed per configuration. Furniture, and any plumbing fit-out beyond the listed scope, vary by model and order, so list what you expect to find inside the unit in RFQ block 5 rather than assuming either way.
What is the minimum order quantity? The site office product pages list MOQ of 1 set, so a single office can be ordered on its own. Freight economics still favour grouping units, which is why camp orders ship office and accommodation units in one loading plan.
If you have the headcount and site basics, the most direct route to a comparable price is an RFQ that contains the seven blocks above. Send it through the contact page and the quotation you get back will itemize configuration, delivery scope and documentation separately, so you can compare it against any other supplier line by line.
Related reading: How to Prevent Condensation in a Modular Container Office | Two-Storey Flat-Pack Container House from China
Planning a site office for your project? Send us your headcount, site location and layout requirement - we will return an itemized quotation with configuration, delivery scope and documentation listed separately.
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