Latest Prefabricated Housing Design Specifications

For the latest prefabricated housing design specifications, refer to the 'Residential Project Specifications' GB 55038 - 2025. This specification will be implemented from May 1, 2025, and is a mandatory engineering construction specification. All clauses must be strictly enforced. Additionally, the design of prefabricated panel houses must also comply with general requirements, as detailed below:

Requirements Related to the 'Residential Project Specifications'

1. Floor Height and Clear Height: The floor height of residential buildings should not be less than 3.00 meters; the indoor clear height of bedrooms and living rooms should not be less than 2.60 meters, with local clear heights not less than 2.20 meters. The area with a local clear height less than 2.60 meters should not exceed one-third of the indoor usable area.
2. Sunlight Requirements: Each residential unit should have rooms that meet sunlight standards.
3. Elevator Installation: For residential buildings where the highest entry floor is four stories or higher, or where the height from the highest entry floor to the outdoor design ground exceeds 9 meters, each residential unit should be equipped with at least one elevator. For residential buildings where the highest entry floor is twelve stories or higher, or where the height from the highest entry floor to the outdoor design ground exceeds 33 meters, each residential unit should be equipped with at least two elevators.
4. Balcony Rail Height: The net height of balcony railings should not be less than 1.20 meters. When the sill height of an exterior window adjacent to an open space is less than 0.90 meters from the indoor floor, protective facilities should be installed. The height of these protective facilities should be measured from the indoor floor or a steppable surface and should not be less than 0.90 meters. The height requirements for protective facilities vary depending on the height of the bay window sill.
5. Exterior Window Placement: When the ratio of the net width to the net depth of a recess in a residential building is less than 1:3 and the net width is less than 1.20 meters, the exterior windows of bedrooms and living rooms should not be placed within the recess.
6. Installation of Outdoor Air Conditioning Units: A dedicated, accessible platform or reserved space should be provided for easy installation and maintenance operations. The connection between the dedicated platform and the main building structure should undergo structural design, with a design service life equal to that of the main structure. The location of the outdoor unit should ensure unobstructed ventilation and should not adversely affect outdoor personnel or adjacent windows. When grilles or walls are installed around the outdoor unit location, they should not obstruct the effective heat dissipation of the air conditioner.
7. Bathroom Placement: Bathrooms should not be directly located above the bedrooms, living rooms, kitchens, or dining rooms of other households.
8. Elevator Car Dimensions: For residential units equipped with elevators, at least one elevator should have a car door net width of not less than 0.90 meters. When a wide car is used, the long side dimension of the car should not be less than 1.60 meters, and the short side dimension should not be less than 1.50 meters.

General Requirements for Prefabricated Panel Houses

1. Technical Standard Requirements: They must comply with relevant national building technical standards, including requirements for structural strength, waterproofing, fire resistance, and other performance aspects.
2. Material Requirements: The materials used must meet environmental protection requirements, must not contain harmful substances, and must be certified by relevant institutions.
3. Design Rationality: The design must be reasonable, considering aspects such as structural layout, ventilation, and lighting.
4. Safety Requirements: They must comply with safety standards, including requirements for earthquake resistance and fire prevention.
5. Service Life Requirements: The design and material selection should consider the service life to ensure that the house reaches the expected lifespan.