The Address

How a BTO Application Works: The HFE Letter, the Ballot and Booking a Flat

Posted by eduKate Asia on

By The Address desk · Last verified 28 September 2026

Buying a new HDB flat starts with the HDB Flat Eligibility (HFE) letter. It tells you whether you can buy a flat, which CPF housing grants you qualify for, and how much you can borrow from HDB. You can’t apply for a BTO flat without a valid one. The letter is free, usually takes about a month, and is valid for nine months. Then you apply during a sales launch for S$10, wait for the ballot, and book a flat when your queue number comes up, paying an option fee of S$500 to S$2,000.

Quick facts

  • You need a valid HFE letter before applying for a BTO or SBF flat.
  • The HFE letter is free, takes about a month, and lasts nine months.
  • A BTO application costs S$10, submitted during a one-week window.
  • Ballot results arrive up to two months after applications close.
  • Option fee when you book: S$2,000 (4-room and bigger), S$1,000 (3-room), S$500 (2-room Flexi).
  • Resale buyers need the HFE letter before getting an Option to Purchase.

What does the HFE letter tell you?

Three things in one assessment: whether you’re eligible to buy an HDB flat, which CPF housing grants you can receive, and whether you qualify for an HDB loan, and for how much. It replaced the old HDB Loan Eligibility letter in May 2023. If you plan to borrow from a bank instead, you can ask participating banks for an in-principle approval at the same time.

When should I apply for it?

Early. HDB aims to issue the letter within 21 working days of a complete application, but it takes longer in the months before a sales launch. One guide advises applying by the 15th of the month, at least two months before the launch you’re aiming for. You apply on the HDB Flat Portal with Singpass, and most details come from Myinfo.

What happens after that?

  1. Apply during a sales launch. The window is open for about a week, and each application costs S$10.
  2. Get your ballot result. HDB emails it, up to two months after applications close, with a queue number if you’re successful.
  3. Book a flat. From about four weeks after the results, applicants are invited in queue order. You pay the option fee when you book.
  4. Sign the Agreement for Lease and pay the downpayment, then wait for the flat to be built.

The WahLiao Verdict

Get the HFE letter as soon as you’re serious, not when a launch you like is announced. Nine months of validity covers more than one launch, and the letter also tells you your budget, which makes it easier to choose which launch to try.

Questions people ask

Does the HFE letter cost anything?

No. It’s free to apply for.

What if my income changes after I get it?

Changes in income, employment, marital status or property ownership can mean HDB needs to reassess you.

Do I need it for a resale flat?

Yes, before the seller grants you an Option to Purchase.

Can singles apply for BTO?

Singles generally have to be citizens aged 35 or above, and some flat types are restricted. Check HDB’s current rules.

Sources: MyNiceHome, buying a flat step by step; MoneySmart, BTO step-by-step guide; Dollars and Sense on HFE timing; Home & Decor on HFE and the old HLE letter; Income on eligibility.

Read next: Standard, Plus and Prime Flats · HDB Housing Grants · Back to The Address

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