Permanent prefab office buildings design specification points

I. Structural system and material specification

• Modular unit design

Standardized prefabricated components need to be used, and the module size needs to meet the modulus requirements of the Office Building Design Standards on space layout 

(e.g., 6m×12m or 3m×6m base unit).

The connection nodes between modules need to meet seismic and wind load requirements, adopt high-strength bolts or welding technology, and pass the structural safety review.

• Material Requirements

The main structure should prioritize the use of lightweight steel structure or composite concrete precast panels, 

and the fire resistance level should meet the fire resistance limit of more than 1 hour.

Enclosure materials should meet the energy-saving standards (e.g. double-layer hollow Low-E glass, rock wool insulation), and priority is given to recycled concrete, 

bamboo fiber boards and other environmentally friendly materials.

II. Functional Layout and Spatial Design

• Dynamic adaptive design

The internal space needs to support flexible reorganization, using detachable partition systems (e.g. magnetic touch surface track walls) 

and modular furniture to adapt to departmental adjustment or functional expansion needs.

Public areas (meeting rooms, leisure areas) should be linked with the office area and reserved for intelligent equipment interfaces (e.g. embedded projectors, wireless charging desktops).

• Humanization standard

The area of a single workstation is not less than 4 square meters, the floor height is not less than 2.7 meters, the natural lighting coverage needs to be ≥75%, 

and the anti-glare adjustment system is configured.

Corridor width is graded according to the number of users: main channel ≥ 1.8 meters, secondary channel ≥ 1.2 meters, to ensure emergency evacuation efficiency.

III. Safety and equipment integration specifications

• Fire prevention and emergency system

Each floor is required to set up an independent fire partition, equipped with smoke induction sprinkler system and escape indicator, 

and the fire resistance limit is in accordance with the Code for Fire Protection in Building Design.

The safety exit distance is not more than 40 meters, the width of the stairwell is ≥1.1 meters, and the high-rise building needs to be equipped with a refuge floor.

• Intelligent equipment integration

It needs to integrate the Internet of Things system to realize automatic adjustment of environmental parameters (temperature and humidity, CO₂ concentration) 

and support energy consumption monitoring and optimization.

The electromechanical equipment (air conditioning, fresh air) should be modularized and pre-installed, 

and the pipelines should be hidden in the mezzanine or ground track slots, so as to reduce the difficulty of later transformation.

IV. Energy Saving and Sustainability Requirements

• Energy System

Prioritize the configuration of photovoltaic curtain wall or rooftop solar panels, combined with energy storage equipment to achieve 20%-30% energy self-sufficiency58.

Adopt rainwater recycling system to irrigate three-dimensional greening and reduce municipal water dependency57.

• Full life cycle design

Modular components need to be labeled with traceable codes to support future disassembly and reorganization or material recycling (e.g. steel recycling rate ≥90%).

Carbon emissions during the construction phase need to be optimized by BIM technology to reduce construction waste generation.

V. Review and Acceptance Process

Modularized structural safety inspection report needs to be submitted at the design stage and wind tunnel test by a third-party agency.

Completion and acceptance need to comply with the special provisions on prefab office buildings in JGJ/T67-2019, the Design Standard for Office Buildings.

Key design principle:

Balance of standardization and flexibility: 20% expandable space is reserved on the basis of modular prefabrication.

Human-oriented: Enhance employee health experience through natural light simulation, acoustic noise reduction and other details.

Technical compliance: strict adherence to LEED or WELL certification requirements to ensure building performance matches sustainability goals