Check that your HDB unit has fulfilled its Minimum Occupation Period (MOP).
Register your intent to Sell and check on the Ethnic Integration policy.
Check on the Ethnic Integration policy.
Do your research using the HDB Map Services on past transaction data.
Financial Calculation of your CPF used and how much CPF / loan you can utilize for the next house
Apply for your HLE and or bank loan before committing to a unit. Ensure that you qualify for a loan and set a budget in mind.
Register your intent to buy and check in the Ethnic Integration policy for the units you have shortlisted.
Estimated valuation of the unit.
Research on past transactions of the area using HDB Map services to get a feel of past selling price of the area.
Financial Calculation of your CPF used and how much CPF / loan you can utilize for the next house