3. Property agent commission fees Your property agent has done the job of marketing and closing the deal on your behalf. Naturally, they’ll have to be paid for their services. Typically, the market rate for an agent would set you back one per cent to two per cent of the transaction price. 4. Legal fees By appointing HDB to act for you in the legal process, this will ensure that your legal fees remain extremely affordable. For instance, if you’re looking to sell your four-room HDB flat for $500,000, HDB’s Legal Fees Enquiry Facility computed that your total legal fees payable will add up to $290.