Letting anyone seal over old silicone
New silicone does not bond to old silicone, and mould trapped underneath grows straight through the fresh bead. If the technician is not spending most of the job on removal and drying, the reseal will fail within months. Ask to see the joint clean and dry before the new bead goes in.
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.
Judging the quote instead of the method
The cheapest quote often prices a different job: silicone over silicone, plugs instead of proper anchors, no anti-tip strap on the wardrobe. When quotes differ widely, ask each vendor how they will do the job. The one who mentions wall type, anchors and cure times without prompting is usually the one worth paying.