What are the fees and costs involved in buying a HDB Resale flat?

There's a full breakdown of all the costs in this Bluenest guide, but basically:

• Option Fee + Option Exercise Fee (set by the seller - total shouldn't exceed 5k)
• Downpayment
• Resale flat application fees ($40 for one or two-roomers & $80 for larger units)
• Admin fee for Temporary Extension of Stay (optional -- only if the seller asks for it, and up to you if you want to grant it)
• $120 Processing fee for HDB Request for Value (if using CPF or HDB loan) / $200-400 for valuation report if getting a bank loan
• Cost of fire insurance (nominal, only like $1.50-$7.50 for 5 years)
• Premiums for CPF's Home Protection Scheme (automatic enrolment if you're using CPF funds)
• Cost of comprehensive home insurance policy (optional)
• Cost of Mortgagee Interest Policy if you're getting a bank loan
• Agent commissions (if you're engaging one)
• Interest on the home loan
• Buyer stamp duty
• Conveyancing fees (tip: HDB solicitors are the cheapest route)
• Caveat registration/title search fee (less than $100)
• Bank / HDB loan legal fees

Hope that helps! :)