Since the HDB has rules and regulations for public housing, homeowners aren’t allowed to do whatever they want when having their houses renovated. First all, homeowners need to submit a plan to HDB and wait for it to get approved before starting any hacking. Some walls, columns, and slabs are load-bearing, so they can’t be removed or altered in any way. Another rule to remember is that bathroom floors & walls of BTO properties cannot be changed for three years. All of them are coated with a waterproof membrane to prevent water from entering the unit. If this is ignored by the homeowner, they will have to shoulder the cost of fixing the damage to their neighbour’s property. Exposed pipes also can't be permanently concealed, even if they’re an eyesore. In the event of clogs, HDB must be able to access the pipes to check the problem. There are restrictions on windows and grilles as well. Homeowners aren’t allowed to remove or tamper with the safety railing installed by the HDB. Windows can be replaced, as long as the replacements will not be full-height windows and bay windows.