By Winfred Quek · CEA R073319H · Published 29 July 2026
Facts verified: 29 July 2026 · Sources linked below
Search for the cost of upgrading from HDB to condo and you will find plenty of guides on stamp duty alone, or cash and CPF requirements alone, or renovation budgets alone. Almost none of them add every real cost into one total. That is the gap this article closes: one itemised list, one worked example, one honest total, using a S$650,000 HDB flat sale and a S$1.4m condo purchase as the illustration throughout.
The full itemised list
| Cost item | Illustrative amount | Basis |
|---|---|---|
| HDB agent commission + GST | ~S$14,170 | 2% of S$650,000 sale price, plus 9% GST on the commission |
| Legal fees, HDB sale | ~S$2,000 | Typical conveyancing fee for a resale flat sale |
| Buyer's Stamp Duty (BSD), condo | S$40,600 | Tiered 1% to 4% on a S$1.4m purchase per IRAS schedule |
| ABSD, condo (sell-then-buy path) | S$0 | 0% for a Singapore Citizen buying their sole property, HDB sold first |
| Legal fees, condo purchase | ~S$2,800 | Typical conveyancing fee for a private property purchase |
| Bank / valuation fees | ~S$700 | Some banks waive this as part of a mortgage package |
| Renovation | ~S$70,000 | Mid-range of S$50-90 psf on an approx 1,000 sqft unit |
| Interim housing (gap rental) | ~S$12,000 | 4 months at approx S$3,000/month between sale and move-in |
| Moving costs | ~S$1,000 | Packing and movers for a 3 to 4 room flat |
| Illustrative total | ~S$143,000 | Excludes the condo purchase price and loan itself |
Figures are illustrative planning estimates for a S$650,000 HDB sale and S$1.4m condo purchase, based on the current IRAS BSD schedule and typical Singapore market rates for legal, agency and renovation services. Actual costs vary by property, contractor and agent arrangement. See the BSD + ABSD calculator to run your own price.
The two line items nobody adds up
Renovation: the biggest, vaguest number in the whole exercise
Renovation is consistently the single largest non-mortgage cost, and the one guides are vaguest about. Industry cost ranges for a full renovation typically run S$50 to S$90 per square foot depending on whether the unit needs hacking, full carpentry, and higher end finishes, versus a lighter refresh. On an approximately 1,000 square foot condo that is a S$40,000 spread, S$50,000 at the low end to S$90,000 at the high end, which is a wider range than the BSD itself. Get two or three contractor quotes before you finalise your cash flow plan; do not plan around a single average number.
Interim housing: the gap nobody plans a budget line for
If there is any gap between vacating your HDB flat and moving into the new condo, whether the condo is a new launch under construction or a resale unit with a later vacant possession date, you need somewhere to live in between. A 3 to 6 month gap at typical rental rates of S$2,800 to S$3,500 a month adds S$8,400 to S$21,000 that rarely appears in a stamp duty focused guide. Staying with family avoids this cost entirely, but if that is not an option, budget for it explicitly rather than discovering it mid-move.
The ABSD fork: sell-then-buy versus buy-then-sell
The single biggest swing factor in this entire cost stack is not any line item above, it is the order of your transactions. Under the current IRAS ABSD schedule, a Singapore Citizen owes 0% ABSD on a residential purchase that is their sole property, and 20% ABSD on a second property, 30% on a third or more. Where this bites is timing:
- Sell HDB first, then buy the condo: the condo is your only property at the point of purchase, so 0% ABSD applies. This is the scenario used in the table above.
- Buy the condo before your HDB is sold: the condo counts as a second property at the point of purchase, so you owe ABSD upfront at 20% of S$1.4m, which is S$280,000. IRAS allows married couples to apply for a refund of that ABSD if the HDB flat is sold within 6 months of the new purchase and remission conditions are met, but you need to actually have that S$280,000 available upfront, on top of everything else in the table, while you wait for the refund to process.
Buy-then-sell is sometimes unavoidable, particularly with a new launch on a progressive payment schedule where you want to secure a specific unit before your HDB sale completes. But it changes your cash requirement by a factor of roughly three over the sell-then-buy path in this example, S$280,000 of temporary ABSD on top of the S$143,000 baseline, even though most of it eventually comes back. Confirm your own eligibility and the current remission conditions directly with IRAS before assuming a refund applies to your situation.
What is missing from most upgrader guides
Compare this list against the typical online guide and three things usually get left out or understated: the full itemised renovation range rather than a single number, interim housing as an explicit, quantified line rather than a footnote, and the sell-then-buy versus buy-then-sell ABSD fork spelled out in dollar terms rather than described only in general terms. Our own HDB upgrader guide covers the MOP timeline and cash flow gap mechanics in more depth; this article exists specifically to total the dollar figures that guide describes separately.
The verdict: a Money, Timing & Safety read
- Money: MIXED The S$143,000 baseline is manageable for most upgraders who plan for it, but renovation and interim housing together can swing that number by S$50,000 or more depending on scope and timing, and the buy-then-sell path multiplies the cash requirement nearly threefold in the interim.
- Timing: MIXED Sequencing your sale and purchase to land within the 6 month ABSD remission window, and minimising the interim housing gap, are the two levers most within your control and worth planning before you commit to either property.
- Safety: STRONG Every figure in this stack, BSD, ABSD, legal fees, is governed by published IRAS schedules or standard market rates, so the main risk is under budgeting rather than any hidden regulatory surprise.
The honest takeaway is that the purchase price and the mortgage are only part of an upgrade's real cost. Run your own itemised total using the BSD + ABSD calculator, the TDSR affordability calculator and the loan repayment calculator before you commit to a specific property, and see the purchase timeline planner to map out the sell-then-buy sequencing that avoids the upfront ABSD scenario above.
Frequently asked questions
What is the total cost of upgrading from HDB to condo in Singapore, beyond the purchase price?
In an illustrative sell-then-buy scenario, selling a S$650,000 flat and buying a S$1.4m condo, the itemised non-mortgage costs total roughly S$140,000 to S$145,000: about S$14,000 in HDB agent commission plus GST, S$40,600 in Buyer's Stamp Duty on the condo, around S$4,800 in combined legal fees, S$70,000 in mid-range renovation, S$12,000 in interim housing during a 4 month gap, and about S$1,000 in moving costs. Renovation and interim housing are the two most underestimated line items.
Do I pay ABSD when upgrading from HDB to condo?
If you sell your HDB flat before or on completion of the new condo purchase, and the condo is your only property, you generally pay 0% ABSD as a Singapore Citizen. If you must buy the condo before your HDB is sold, you pay ABSD upfront at the second property rate (20% for SC as of the current IRAS schedule) and can apply for a refund if you sell the HDB flat within 6 months of the new purchase and meet the remission conditions. On a S$1.4m condo that upfront amount is S$280,000, a major temporary cash requirement many upgraders do not budget for.
How much does renovation typically cost for an HDB to condo upgrade?
Renovation cost estimates from Singapore renovation industry sources typically range from roughly S$50 to S$90 per square foot depending on scope, finishes and whether the unit needs hacking or major carpentry. For an approximately 1,000 square foot condo, that works out to roughly S$50,000 to S$90,000, with S$70,000 as a reasonable mid-range planning figure. Get quotes from your own contractor rather than relying on any published average.
What is the biggest cost upgraders forget to budget for?
Interim or gap housing is the most commonly underbudgeted item. If there is a gap of several months between selling your HDB flat and being able to move into the new condo, whether due to a new launch's construction timeline or a resale unit's vacant possession date, you need somewhere to live in between, which in this illustrative example adds roughly S$12,000 for a 4 month gap at typical rental rates.
Is Buyer's Stamp Duty the same as ABSD?
No. Buyer's Stamp Duty (BSD) applies to every property purchase in Singapore on a tiered scale from 1% to 6% of the price, regardless of citizenship or property count. Additional Buyer's Stamp Duty (ABSD) is a separate, additional duty that applies based on citizenship status and the number of residential properties already owned, and can be 0% for a Singapore Citizen's sole property or as high as 60% to 65% for foreigners and entities.
Want your own itemised total, not an illustration?
A Property Portfolio Analysis runs your specific flat, target property, renovation scope and timeline through the full cost stack, sale sequencing and ABSD exposure included, so you know the real number before you commit.
Book a free portfolio analysis callWinfred Quek is the Principal of Crestbrick Pte Ltd, advising Singapore upgraders, investors, and families. CEA R073319H. The information on this page is general and does not constitute financial, investment, or mortgage advice. All figures are illustrative planning estimates based on published IRAS stamp duty schedules and typical Singapore market rates for legal, agency and renovation services, and are not a quote or guarantee of your actual costs. Verify current BSD and ABSD rates directly with IRAS, and obtain your own quotes for legal, agency and renovation services, before committing to any purchase.