Singapore Condos Best for Dual-key / multi-gen layouts

This page is for buyers wanting a dual-key unit configuration — a main unit (typically 2-3 bedrooms) plus an attached studio or 1-bedroom suite with separate entrance and bathroom. Each "key" is independent: the studio can house a live-in parent, an adult child, a long-term guest, or be rented out separately for yield.

Why dual-key works:

• Multi-gen living (see Multi-generational families): grandparents get a self-contained studio with their own door and bathroom; the main household lives in the larger unit. Privacy without two properties.
• Rental income on the studio: live in the main, rent out the studio. Typical 1-bedroom studio rents $2,000-3,200/month depending on location (URA Realis 2024 rental data). Helps offset the mortgage on the larger combined purchase.
• Adult-child housing: a 20-something just out of NUS / NTU can occupy the studio for several years while saving for their own place. No commute, no transition costs.

Where dual-key is available: newer launches from 2017 onwards have featured dual-key configurations as a developer differentiator. Notable examples: The Tre Ver, Forett @ Bukit Timah, Pasir Ris 8, Liv @ MB, The Watergardens at Canberra, Hillock Green. CCR launches occasionally offer dual-key but tend to skew to high-end (over $3M). RCR/OCR has more affordable dual-key entries ($1.8-2.8M for 3BR+studio).

What to verify: separate entrance (some "dual-key" units have only one external door with internal partitioning — verify the floor plan); separate water and electrical meters (or sub-meters for fair rental cost allocation); kitchenette or full kitchen in the studio; aircon zones independently controllable.

Tax + tenancy considerations: if you rent out the studio, the rental income is taxable (IRAS personal income tax schedule); MCST may have rules about short-term rentals (most prohibit Airbnb-style ≤6-month stays under URA / MCST rules); and the property's "Owner-Occupied vs Non-Owner-Occupied" classification for property tax becomes mixed-use (talk to IRAS or a tax advisor).

Tools: our Affordability Calculator and Rental Yield Calculator (for the studio rental income side).

This is NOT for you if: you don't have a use for the second key (live-in parent, adult child, rental tenant) — dual-key carries a 5-10% PSF premium that you should only pay if you'll actually use both keys.