Jiangsu Prefabricated Housing Standards

The standards for prefabricated housing in Jiangsu Province are primarily reflected in the requirements for the application of prefabricated components in newly constructed buildings, as detailed below:

I. Application Ratio of Prefabricated Components
According to Document No. 43 [2017] issued by the Jiangsu Provincial Department of Housing and Urban-Rural Development, the total proportion of mandatory prefabricated interior and exterior wall panels, prefabricated stair treads, and prefabricated floor slabs (collectively referred to as the 'three panels') in a single building must not be less than 60%. This ratio is calculated based on the ratio of the application area of prefabricated components to the total area of corresponding items, aiming to promote the popularization of prefabricated building technology and enhance the level of building industrialization.

II. Application Scope and Calculation Rules

1. Calculation Scope: Only the total floor area of the above-ground part of a single building is included, specifically the area above the outdoor ground level. Elevator machine rooms, stairwells, equipment rooms on the roof, and podiums of high-rise buildings are not included in the calculation; the calculation scope for floor slabs excludes the ground floor and the building roof.
2. Ratio Calculation: The application ratio of the 'three panels' = sum of the application areas of prefabricated components ÷ total area of corresponding items. For example, if the areas of prefabricated interior and exterior wall panels, stair treads, and floor slabs in a building are 200㎡, 100㎡, and 300㎡ respectively, and the total area of corresponding items is 1000㎡, then the ratio is (200+100+300) ÷ 1000 = 60%.

III. Requirements for Construction Drawing Review

1. Design Depth: Construction drawing design documents must comply with the national 'Regulations on the Compilation Depth of Architectural Engineering Design Documents' (2016 edition) and the 'Review Guidelines for Construction Drawings of Prefabricated Buildings (Concrete Structures) in Jiangsu Province' (trial), ensuring complete design content and clear technical parameters.
2. Special Instructions: Projects applying the 'three panels' must prepare special design instructions for prefabricated buildings, specifying the above-ground area of each building unit, the application locations of the 'three panels', and the total ratio, and provide calculation sheets as supporting materials.
3. Submission and Review Process: When submitting construction drawings for review, the construction unit must fill in the application status of the 'three panels' in the submission form to ensure that the reviewing agency can quickly verify compliance.

IV. Handling of Special Cases
If a building cannot fully or partially apply the 'three panels' due to special needs (such as geological conditions or functional limitations), it must undergo expert论证 (expert demonstration) organized by the construction administrative department of the prefecture-level city to confirm its reasonableness before adjusting the ratio or being exempted from application.

V. Local Supplementary Policies
Nantong City in Jiangsu Province has introduced a physical examination system for existing prefabricated slab buildings: urban residential buildings built more than 25 years ago undergo a physical examination every 10 years, and multi-household prefabricated slab residential buildings are shortened to every 5 years to ensure structural safety and extend the building's service life.