Residential Basement Retrofit with a 3-Level Puzzle System

Turning 8 surface bays in an apartment basement into 22 independent spaces without digging a pit.

Spaces before: 8
Spaces after: 22
Gain: +175%
Pit required: No

The challenge

An existing apartment building had a single basement row of 8 bays and a waiting list of residents. The clear height was about 5.6 m, there was no budget for excavation, and residents needed to retrieve cars independently at any time.

The solution

A lift-slide puzzle system with 3 levels and 8 columns keeps one empty space on each lower level for shuffling. Using the capacity formula (3 × 8 − 2), the same row now holds 22 cars. SUVs park on the ground level, where the height is limited only by the slab above; sedans use the upper levels. Residents call their car with an IC card, and the pallets move so it arrives at the entry level.

Reference configuration prepared by our engineering team for this type of site. Figures are calculated for the layout described; your project will be engineered to its own drawings.