What Is a Dual-Key Condo in Singapore?
One title deed, two front doors. Here's how dual-key units work, who they're for, and whether the numbers actually make sense.
Answer: A dual-key condo is a single unit with two self-contained living spaces — typically a main 2–3 bed unit plus a studio — sharing one title deed. You pay stamp duty on one property, but can rent out the studio for $1,500–$2,500/month while living in the main unit. Popular with multi-gen families and investors chasing higher rental yield (3.5–4.5% vs 2.5–3.5% for regular units). The trade-off: smaller resale buyer pool and two compact spaces instead of one spacious home.
Typical Dual-Key Layout
What you get behind the shared foyer
| Component | Main Unit | Studio Unit |
|---|---|---|
| Bedrooms | 2–3 | 1 |
| Kitchen | Full kitchen | Kitchenette |
| Bathroom | 1–2 (ensuite + common) | 1 |
| Living area | Full living/dining | Compact living |
| Size (typical) | 650–900 sqft | 350–500 sqft |
| Entrance | Own door from shared foyer | Own door from shared foyer |
| Total size | 1,000–1,400 sqft (one title deed) | |
Both sides have separate utility meters. The shared foyer is part of your strata area.
Who Buys Dual-Key Units
Multi-generational families
Parents live in the main unit, adult child (or elderly parent) lives in the studio. Close enough to help each other, separate enough for privacy. One property purchase instead of two — saves a massive amount on ABSD.
Owner-occupier investors
Live in the main unit, rent out the studio. The rental income ($1,500–$2,500/month) offsets your mortgage. You get investment income without buying a second property and triggering ABSD.
Pure investors
Rent out both units to maximise yield. Two rental incomes from one property means higher gross yield. Studios command higher per-sqft rent than larger units, so the blended yield beats a single large unit.
Rental Yield: Dual-Key vs Regular Unit
Based on a $1,500,000 purchase price
| Scenario | Monthly Rent | Annual Rent | Gross Yield |
|---|---|---|---|
| Regular 3-bed (1,200 sqft) | $3,800 | $45,600 | 3.0% |
| Dual-key — studio only | $2,000 | $24,000 | 1.6% |
| Dual-key — main unit only | $3,000 | $36,000 | 2.4% |
| Dual-key — both rented | $5,000 | $60,000 | 4.0% |
Estimates based on OCR condo rental data. Actual rent depends on location, condition, and market. Gross yield = annual rent / purchase price.
Stamp Duty — Same as a Regular Unit
This is the big advantage. A dual-key unit is one title deed, so you pay stamp duty on one property. Compare buying a dual-key at $1,500,000 vs buying a 2-bed ($1,000,000) + studio ($500,000) separately:
| Approach | BSD | ABSD (SC) | Total Stamp Duty |
|---|---|---|---|
| Dual-key at $1,500,000 (1st property) | $44,600 | $0 | $44,600 |
| Two units: $1,000,000 + $500,000 | $24,600 + $9,600 | $0 + $100,000 | $134,200 |
| You save | $89,600 | ||
ABSD on 2nd property for SC = 20%. Buying separately means the second unit triggers full ABSD. Dual-key avoids this entirely.
Resale Considerations
Dual-key units have a smaller resale buyer pool. Here's why:
- Most home buyers want one comfortable living space, not two compact ones
- The total sqft is split awkwardly — neither side feels spacious on its own
- Banks may value dual-key units slightly lower on a per-sqft basis
- Fewer comparable transactions makes pricing harder
- The layout only appeals to a specific buyer profile (multi-gen or investor)
That said: In projects where dual-key units are popular (e.g., near MRT, strong rental demand), resale can still be healthy. The key is buying in a location where rental yield is the draw, not just layout preference.
Pros vs Cons
| Pros | Cons |
|---|---|
| One stamp duty bill, two living spaces | Smaller resale buyer pool |
| Higher rental yield (3.5–4.5%) | Neither unit feels spacious |
| Multi-gen flexibility (privacy + proximity) | Higher MCST fees (larger total sqft) |
| Counts as one property for ABSD | Two tenants to manage if fully rented |
| Rental offsets mortgage (live in one, rent the other) | Can’t sell the studio separately |
Run the numbers on a dual-key unit
Plug in the purchase price and see your stamp duty, monthly mortgage, and what rental income you need to break even.
FAQ
What exactly is a dual-key condo unit?
A dual-key unit is a single condo unit with two separate, self-contained living spaces sharing one title deed. Typically it’s a main unit (2–3 bedrooms, kitchen, living room) and a smaller studio (1 bedroom, kitchenette, bathroom) with separate entrances from a shared foyer. You buy one unit but get two lockable, liveable spaces.
Is stamp duty higher for a dual-key unit?
No. Since a dual-key unit is a single title deed, you pay BSD and ABSD on the total purchase price as one property. There’s no additional stamp duty for the second key. A $1.5M dual-key unit pays the same $44,600 BSD as a regular $1.5M condo.
Can I rent out just the studio side of a dual-key unit?
Yes, and that’s the main appeal for owner-occupiers. You live in the main unit and rent out the studio. This is not subletting — you’re renting part of your own property. Rental income from the studio can offset $1,500–$2,500/month of your mortgage.
What is the typical rental yield on a dual-key condo?
Dual-key units can achieve 3.5–4.5% gross yield when both sides are rented out, compared to 2.5–3.5% for a regular unit. The studio commands a higher per-sqft rent, boosting overall yield. However, vacancy risk doubles since you have two tenants to manage.
Are dual-key units harder to sell on resale?
Generally yes. The buyer pool is smaller because dual-key layouts don’t appeal to everyone. The total size is usually 1,000–1,400 sqft split into two small spaces rather than one comfortable home. Resale typically takes longer than a standard 3-bedroom unit of similar size.
Does a dual-key unit count as one or two properties for ABSD?
One property. Since it’s a single title deed with one strata lot, it counts as one residential property for ABSD purposes. This is the key advantage — you get two rentable spaces while only “using up” one property slot.
Related
- Rental Yield on Singapore Condos — yield benchmarks by area
- New Launch Condo Buying Process — step-by-step guide
- ABSD on Second Property (SC) — what dual-key helps you avoid
- Condo Management Fees Breakdown — MCST costs for larger units
- Subletting a Condo in Singapore — rules for renting out your unit
Last updated Feb 2026. Rental yield and pricing are estimates based on market data. Stamp duty rates effective 27 Apr 2023. This is general information, not financial advice.