Many architects begin home design with a preferred concept and then adjust it to site constraints afterward. This approach typically leads to multiple redesign rounds and sometimes requires abandoning the core concept entirely. BIM Site Constraint Analysis reverses this by understanding limitations first, then designing within them.
Five Constraint Categories BIM Analyzes
Constraint 1: Irregular Lot Analysis — Perfectly rectangular plots are rare. BIM models the actual lot from survey coordinate data, immediately showing the true buildable area after applying mandatory Setbacks. Thai regulations typically require 1–3 m setbacks from plot boundaries depending on building type.
Constraint 2: Floor Area Ratio Simulation — FAR defines maximum allowable total built floor area. BIM automatically calculates FAR for each design option, allowing the design team to maximize permitted area without violating regulations.
Constraint 3: Neighboring Building Impact Assessment — Adjacent structures affect natural light and ventilation of the home being designed. BIM imports surrounding building data to simulate shadow coverage at different times of day and identify whether natural ventilation paths are obstructed.
Constraint 4: Bangkok Flood Risk Micro-Analysis — Bangkok has significant flood risk in specific areas. BIM combined with Micro-Topography data and DEM (Digital Elevation Model) determines safe ground floor elevation, optimal stormwater drainage direction, and Landscaping design to reduce risk.
Constraint 5: Soil Bearing Capacity Constraints — BIM combined with Geotechnical Survey data shows the soil’s actual load-bearing capacity. In Bangkok, the Bangkok Clay Layer (15–20 m depth) has low bearing capacity, requiring precision pile foundation engineering.
Optimal Column Grid Analysis
Finding the right column placement balances structural span efficiency against interior space planning flexibility. BIM tests multiple Column Grid options to find the configuration that maximizes Space Planning flexibility while achieving structural efficiency. Optimal spans for standard RC construction: 4–8 metres.