Applying for HDB Flat: So You’ve Applied for a BTO or SBF Flat, What’s Next? 5 Things to Look out For

Congratulations on getting engaged and your search for a new HDB flat to begin your next chapter in life! Considering that you’ve clicked into this article, you’re probably still unsure of what to do after you popped the question (or said yes) to “BTO, ai mai?”

With COVID-19 construction delays adding up to a year or more onto a BTO flat’s completion date, more young couples may consider SBF flats, resale HDB flats or turn to renting in their quest for home sweet home.

To provide a clearer understanding of how to apply for a new HDB flat, we’ve broken down the timeline and costs required in the application process. For good measure, we’ll also cover the types of HDB flats you can apply for, how balance flats work and how to check your HDB application and HLE (HDB Loan Eligibility) status. 

Note: This article will focus on the process of buying new BTO (Build-to-Order) or SBF (Sales of Balance Flats) flats only. If you’re interested in other HDB properties, check out our Resale Flat guide and/or Executive Condo guide.


Artist’s Impression of Tampines Green Opal for August 2020’s BTO launch
Artist’s Impression of Tampines Green Opal for August 2020’s BTO launch


Difference Between BTO and SBF Flats 

If you don’t know already, BTO flats are housing you buy directly from HDB. Generally, BTO sale launches happen quarterly, in February, May, August and November. You can either stalk the HDB website or view recent and upcoming HDB BTO launches on the PropertyGuru website. 

BTOs come with basic home design features and are an affordable and popular option for young married couples who are first-time homeowners.

Balance flats are the units that remain unsold from past BTO launches are put up for sale by HDB. They are also known as SBF flats. Leftover flats from Selective En-bloc Redevelopment Scheme (SERS) projects or repossessed flats repurchased by HDB are also included under the SBF scheme.

Leftover flats from the SBF exercise is then put up on the Open Booking of Flats Portal. The open booking system allows flats to be purchased on a first-come-first-serve basis.


HDB BTO Flat Types and Prices

For those who are still deliberating on what type of flat to choose, here is a brief overview of the types of BTO flats you can choose from and what you should expect to pay for such a flat.

Type of HDB Flat

Price Range

2-room Flexi

$90,000 to $100,000


$160,000 to $180,000 (non-mature estate), $200,000 to $300,000 (mature estate)


$250,000 to $300,000 (non-mature estate), $300,000 to $500,000 (mature estate)


From $400,000

3 Gen

From $300,000 (non-mature estate), from $500,000 (mature estate)

Executive Flat

From $400,000

But before we deep dive into the details, it’s important to clarify each flat category typically comes with one less room than indicated in its title. For instance, a 4-room flat has only three bedrooms as HDB counts the living room as a ‘room’. 5-room flats are an exception to this rule, with only three bedrooms.

2-room Flexi HDB Flat

  • Layout: 1 bedroom, 1 bathroom 
  • Area: 36 or 45 sqm 

3-room HDB Flat

  • Layout: 2 bedrooms, 2 bathrooms 
  • Area: 60 or 65 sqm 

4-room HDB Flat

  • Layout: 3 bedrooms, 2 bathrooms 
  • Area: 90 sqm 

5-room HDB Flat

  • Layout: 3 bedrooms, 2 bathrooms 
  • Area: 110 sqm 

3 Gen HDB Flat

  • Layout: 4 bedrooms, 3 bathrooms 
  • Area: 115 sqm 

Executive Flat

  • Layout: 3 bedrooms, 2 bathrooms 
  • Area: 130 sqm 

All BTO flats come with a storeroom/bomb shelter, living/dining area and kitchen. 2-Room flats do not usually come with a service yard. 5-Room flats may or may not come with a balcony area. 

Different flat types also have different income ceilings and various eligibility criteria. Generally, the income ceiling is $7,000 or $14,000 (depending on the project) for 3-room flats, and $14,000 for 4-room and up. For those purchasing with extended or multigenerational families (like for 3 Gen flats), the income ceiling is $21,000. 


HDB BTO Payment Timeline: Buying an HDB Flat 

To help you better plan for your HDB purchase, here is a checklist of what you need to check and get ready. We’ve also included the estimated time periods between each step.

1. Announcement of the HDB Flat Sales Launch

What to do

  • Look out for BTO/SBF launch announcement
  • Find out when is the application period for balloting
  • Check your eligibility to buy a flat
  • Check your HDB loan eligibility or bank loan eligibility
  • Make sure your finances are secure

When it happens

  • BTO launches every quarter
  • SBF launches twice a year

2. Submit Your HDB Ballot Application

What to do

When are ballot results announced

  • BTO ballot results are released about three weeks after the application period closes
  • SBF ballot results are released about 1.5 months (six weeks) after the application period closes

3. Book Your HDB Flat

What to do

  • Successful ballot applicants will be invited to make an appointment to book a flat
  • Check out your home loan options
  • Before your appointment, get a valid HDB Loan Eligibility Letter if you want to take an HDB loan
  • Alternatively, apply for your Approval-in-Principle (AIP) if you’re intending to make a bank loan
  • Apply for Enhanced Housing Grants, if applicable
  • Bring your IC and other necessary documents to the appointment
  • Pay the Option-to-Purchase (OTP) fee ($500 for 2-Room Flexi flats; $1,000 for 3-Room flats and $2,000 for 4-Room or larger flats)

When can you book a flat

  • 1 to 2 weeks from the release of the ballot results
  • Appointments are scheduled by queue number

4. Sign the Agreement for Lease

What to do

  • Successful ballot applicants will be invited to make an appointment to book a flat
  • Submit a valid HDB Loan Eligibility Letter or a Letter of Offer (if you are taking a bank loan)
  • Pay your downpayment, stamp duties and legal fees 

When can you sign your agreement for lease

  • Four months from your flat-booking appointment

5. Key Collection

What to do

  • Wait for your house to be built
  • Collect your keys

When can you collect your keys

  • BTOs are usually completed in about three years
  • For completed SBF flats, you can collect your keys within three months
  • For SBF flats under construction, you can only collect your keys when the flat is completed

bto sbf article 2


How to Check HDB BTO Application Status 

After you’ve paid the non-refundable $10 fee and applied for a flat, you’ll have to wait for the results. BTO and SBF results are released about three and six weeks respectively after the application period closes.

You can check the number of applications received and your SBF or BTO application status via the HDB website.

Successful applicants will receive a ballot number and be invited to make an appointment to book a flat. If you’ve reached this step, it’s time to kickstart the process of getting a home loan. You can go for either a bank or HDB loan. If you intend to go for an HDB loan, you have to check your HDB Loan Eligibility status to get your HLE letter.


How to Check HDB Loan Eligibility Status 

The HDB Loan Eligibility letter is a required document for those who wish to take an HDB loan to finance their flats. The HLE letter is valid for six months. If you wish to apply for another loan, you have to wait for 30 months from the date of disbursement of your initial HDB loan. 

Successful ballot applicants should get their HLE letter before attending the appointment to book their flat. To obtain their HLE letter, they first have to perform an Eligibility Check and ensure they fulfil the credit assessment criteria. 

Then, prepare the required documents and apply for the HLE letter on the SingPass website. After, you can check the status of your HLE application. Once you are successful, you can obtain and submit the HDB Loan Eligibility Letter when you sign your agreement for lease, within four months from your flat-booking appointment.

Read more about the steps required for an HDB Loan Eligibility Application here. Should your finances change in future, there is always the option to refinance your HDB Housing Loan to a bank loan later on.


Applying for BTO or SBF Flat

If you’re a Singapore Permanent Resident who wants to buy an HDB flat, you’re only allowed to buy a resale HDB flat. Additionally, you’ll have to meet all the eligibility conditions. Find out more about what schemes and grants you qualify for here.

Hopefully, this article has made it easier for you to understand the HDB flat application process!

Should you need help with the home loan application process, you can drop a question on PropertyGuru’s AskGuru forum and have an expert answer your query. Alternatively, approach one of our friendly home loan advisors to help you out!


More FAQs about Applying for an HDB Flat (BTO or SBF)

Can I Apply SBF and BTO?

You can’t apply for both simultaneously. HDB SBF launches tend to coincide with BTO launches so do keep your eyes peeled.

Is SBF More Expensive Than BTO?

Yes. As you do not have to wait to get your flat with SBF units, they tend to be more expensive than BTO flats.

How Long Does SBF Results Take?

Six weeks after the application period closes. BTO results are released three weeks after the application period closes.

How Can I Increase My Chances of Getting a BTO Flat?

You could choice a non-mature/less popular estate or stay near to or with your parents. Check out our guide on how to ace your HDB BTO application.


For more property news, resources and useful content like this article, check out PropertyGuru’s guides section

Are you looking to buy a new home? Head to PropertyGuru to browse the top properties for sale in Singapore.  

Already found a new home? Let PropertyGuru Finance’s home finance advisors help you with financing it.


This article was written by Cheryl Chiew, Digital Content Specialist for PropertyGuru. Cheryl likes bread and cats, especially when cats tuck in their limbs so they look like bread. Drop her an email that hopes to find her well at

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