At OCCA, each construction project is technically assessed for its suitability for volumetric offsite or hybrid offsite.
Therefore, we deliver solutions which are tailored to project’s specific needs

Volumetric Modular

Volumetric modular units are large building elements and once they are brought together at the construction site they form complete buildings without the need for an additional superstructure.

OCCA’s volumetric modules’ are steel based and Galpan’s design teams provide the structural design. As the level of coordination between different design disciplines namely structural, architectural and MEP is maximal for volumetric modules, OCCA and Galpan, starting from day one, join forces to arrive at modules that are almost all finished and well-coordinated with each other in both vertical and horizontal sense. OCCA’s volumetric modules are 90 % complete and they come with kitchens, window frames including glasses, and mechanical, electrical and plumbing lines.

At OCCA, 3D design and digitization technologies such as Autodesk REVIT are utilized to achieve high level of co-design amongst project partners. By doing so, possible clashes are detected early enough, and costly changes during production are all prevented.

According to a recent study*, in the USA, segments of specialty on construction such as plumbing electrical and HVAC contractors have the highest portion of construction sector’s value added and yet they have the lowest labor productivity. Installing MEP works at construction site and not utilizing BIM software always result with delays and unforeseen clashes with other disciplines. At the volumetric modules that are designed by OCCA, most of MEP lines such as plumbing, electrical, ventilation, air-conditioning and sprinkler are all installed at the factory and once modules come together at site, on site installation teams will only need to install vertical MEP lines into shafts.

OCCA designs and manufactures dual purpose modules that contain both stairs and elevator shafts and this design approach eliminates a lot of quality issues resulting from on-site welding. The stairs are also almost fully finished, even they come with handrails.

As part of providing complete service to our clients, OCCA can also arrange for transportation of volumetric modules which cannot be containerized due to their large size. Lifting frames for truck loading at the Factory, unloading at the port of departure and at the port of destination as well as at site are designed and provided by OOCA. These frames make sure safe handling of modules during transportation and installation.

*McKinsey&Company, Reinventing construction: A route to higher productivity
February 2017, page 37

Hybrid Offsite

Since its inception, OCCA Offsite set out to become a good example of an offsite construction company that has both design and manufacturing capability for offering construction solutions and products utilizing Modern Methods of Construction (MMC), a term widely used for employing offsite methods for much improved project delivery.

As one of the types of Modern Methods of Construction (MMC)*, hybrid offsite construction is an alternative to volumetric offsite construction and it combines traditionally built steel structure with modular offsite solutions such as bathroom pods and prefabricated façade panels. Hybrid offsite construction actually stands between traditional on-site built construction and volumetric offsite construction. Hybrid offsite is an adaptable construction method for those construction projects where use of volumetric offsite is not a viable option especially due to plan layouts and project parameters.

OCCA Hybrid System consists of three major components:
OCCA Superstructure:  Steel based all column and beam superstructure
OCCA Façade: Steel based and insulated façade panels that are factory manufactured and versatile panels with render, brick, natural stone and metal finishes. The façade panels are large in size and come with window frames and glasses.
OCCA Bathroom Pods: Offsite manufactured bathroom pods that are delivered to site as 3D modules with finished interiors including mechanical, plumbing and electrical works

Design, manufacturing and installation of OCCA Hybrid System is straightforward. The advantages of Hybrid offsite:

  • it demands less coordination among design teams,
  • it offers shorter delivery time,
  • it is adaptable to various types of construction projects such as residential, hospitality, healthcare,
  • it reduces unnecessary costs resulting from poor quality of workmanship at site as all quality controls are done at the factory,


OCCA Hybrid’s components are those ones that have the highest added value in any construction project.
Consequently, good design and quality production of those components contribute a lot to bottom line.