Putting a full-motion TV arm into bare plasterboard
An articulating arm multiplies the TV's weight into leverage at a few fixing points, and plastic plugs in gypsum cannot resist it. The mount holds during the demo and fails weeks later. Insist on metal studs, a backing board, or a different wall.
Skipping the building permit and losing the slot
In permit-controlled towers, a technician stopped at security is a wasted visit that you may still be charged for. Five minutes with building management before booking, asking about NOCs, service-lift rules and drilling hours, protects both your slot and your deposit with the building.
Fixing developer defects at your own cost
Cracked tiles, failed grout and misaligned kitchen units in a new handover are usually the developer's obligation during the defects liability period. Paying a handyman to fix them both costs you money and can undermine the official snag claim. Document and report first; hire for the jobs the developer never owed you.