Structural vs Non-Structural Walls
You can NEVER hack a structural (load-bearing) wall in an HDB flat. Doing so compromises the building safety. Only non-structural walls (usually 100mm thick) can be demolished.
HDB Permit is Mandatory
Before any hammer swings, your BCA-approved contractor must submit a floor plan to HDB and obtain a hacking permit. Unauthorized hacking carries severe penalties.
Cost of Hacking
Hacking a standard non-structural wall between a bedroom and living room typically costs $500 to $900, which includes the demolition labor and debris disposal fees.