The construction cost of an underground parking lot will be affected by many factors. Generally speaking, the cost per square meter is about 2,000 to 3,000 yuan. The following are some influencing factors:
Structure form:
Ordinary cast-in-place structure: For example, the cast-in-place cross beam structure. The cost of the underground first floor is about 1,600 yuan per square meter, and the cost of the underground second floor is about 2,200 yuan per square meter.
New structure: For underground one-story garages with structures such as hollow floor slabs, laminated beams, honeycomb cores, and formwork shells, the cost is about 2,100 yuan per square meter. The cost of the underground second floor is about 2,100 yuan per square meter. Due to the use of large-span prestressed garage slabs, the overall cast-in-place prefabricated structure has a relatively low comprehensive cost. The cost of the overall prefabricated garage on the underground first floor is about 1,200 yuan per square meter, and the cost of the underground second floor is about 1,900 yuan per square meter.
Number and layout of parking spaces: Reasonable parking space layout can improve space utilization and reduce construction costs. If the parking space layout is unreasonable and it is necessary to increase the channel area or adjust the structure, the cost will increase. Generally, the area of each parking space plus the channel area is about 20-25 square meters.
Number of underground floors: The cost of building an underground two-story parking lot is usually much higher than that of an underground one-story parking lot. On the one hand, it is because the underground second floor requires more earth excavation, support and drainage projects. On the other hand, the structural design and construction difficulty will also increase.
Civil air defense requirements: If the underground parking lot needs to take into account civil air defense functions, then the construction cost will increase. For example, for every 1 square meter of independent garage added, 0.3 square meters of civil air defense project needs to be added. The cost of civil air defense engineering is much higher than that of ordinary underground garages.
Geological conditions: In areas with poor geological conditions, such as soft soil foundations or areas with high groundwater levels, special foundation treatment and waterproofing projects are required, which will increase construction costs.
Supporting facilities: The quality and complexity of supporting facilities such as lighting, ventilation, fire protection, and drainage systems in the parking lot will also affect costs.
