At a dual-key viewing, walk through the home as two households. Start at the lift or corridor, follow each route inside, and work out what each occupier would need to share. A second lock is only one part of living separately.
This checklist is for inspecting a completed private condo with adjoining living sections. It does not certify a specific unit’s construction, approved use or rental eligibility. For the budget, tax and ownership decision, read our separate dual-key versus conventional condo comparison.
Obtain the plan before judging the layout
Ask for the approved plan and identify which doors, partitions and fittings belong to it. CEA’s completed-property buyer checklist recommends checking approved use and unauthorised alterations; it also points buyers towards competent professional inspection when needed. A seller’s furniture drawing cannot establish building approval.
Mark the studio, main section and shared space on your copy. Put your own furniture dimensions alongside the room measurements. Avoid treating the advertised total area as the floor space available to the main household. Our condo floor-plan guide helps with that first pass.
Test the entrance as both occupants
With the seller’s permission, stand in each entrance while another member of your household uses the adjoining section. Check sightlines into bedrooms and living areas. Locate shoe storage, delivery space and door swings. Ask how keys and access cards are allocated and whether any route depends on the other household opening a door.
Walk the route you would use carrying groceries, a pram or mobility equipment. If a parent may need care, consider how you would reach them at night. Agree how emergency access would work without making an unsupported assumption about altering locks or common property.
Check sound and services
| Check | Practical question |
|---|---|
| Sound | Can you hear normal conversation, a television or doors closing through the separating wall or lobby? A brief viewing cannot establish overnight noise. |
| Cooking | Where do cooking smells travel? Check the actual ventilation and permitted fittings; do not assume a kitchenette supports the meals you usually cook. |
| Laundry | Where are the washer, dryer and drying space? Can either household use them without entering the other’s private area? |
| Utilities | Where are the meters, switches and shut-off points? Which services are shared, and how would charges and maintenance access be agreed? |
| Internet and work | Where could each occupier place a router and desk? Test reception where permission and access allow, rather than assuming the listing’s coverage claim. |
| Storage | Where will suitcases, cleaning equipment and spare bedding go once both sections are occupied? |
Record what you observed, what the seller said and what still needs evidence in separate notes. “Seller says separately metered” should remain unverified until you have checked the relevant arrangement. If a service is shared, discuss billing and access before a tenancy is signed.
Try three ordinary days
A workday: place two people on calls in their intended rooms. Think about breakfast, laundry and deliveries happening at the same time. You are checking a routine, not measuring formal acoustic performance.
A family visit: work out where guests would sit and which bathroom they would use. Would accessing the main dining table require walking through someone else’s sleeping area? Could an older relative manage the route comfortably?
A change of plans: imagine the studio is no longer rented, a parent moves in or a child needs a separate room. Decide whether the existing layout still serves you. Do not assume walls can be removed or the sections can be combined without checking permissions and obtaining a proper quotation.
Price the layout when the second section earns nothing
Before giving the second entrance a financial value, compare two ways your household might use the home: a parent occupies the adjoining section, or it remains empty between uses. In either case, the purchase still needs to fit the household budget without an assumed rent. A layout can solve a privacy problem while making the main living area smaller.
Illustration: Suppose the household has S$8,500 a month available after tax and employee CPF deductions. Its assumed cash housing payment is S$3,200, condo contributions S$450, household living costs S$3,000 and other regular commitments S$600. The amount left before saving or optional spending is S$1,250. These are hypothetical household inputs, not mortgage offers, maintenance quotations or market averages.
Now assume using both sections requires S$250 more each month for utilities and services, plus S$150 for agreed cleaning and replacement allowances. The available balance falls to S$850. Over six months, those additional S$400 monthly costs total S$2,400. A further assumed S$3,600 spent on separate appliances and furniture makes the first six months’ extra outlay S$6,000. Purchase costs and the main household bills remain outside that extra-outlay figure.
If the adjoining section stays empty for those six months, the example still assumes no rent offsets the costs. Some running costs might fall, but identify which bills genuinely change rather than deleting the whole allowance. If a parent moves in, replace the assumed amounts with the family’s actual care, food, transport and equipment needs. Extra space does not automatically reduce care costs.
Compare the conventional alternative on the same basis
Take a conventional condo you would genuinely consider and repeat the exercise with its actual asking price, assessed financing, contributions and necessary works. Keep household income and ordinary spending the same. Compare the main bedroom count, dining space and storage as well as the monthly balance. An asking-price difference is not a transaction result or a bank valuation.
For the dual-key home, ask whether a parent can have privacy without being isolated, whether a caregiver needs overnight space and whether both sections can handle laundry on the same evening. For the conventional home, check whether the extra shared living space compensates for fewer separate entrances. Write down the compromise that matters most, rather than awarding points simply for having two doors.
If a future letting is part of the plan, establish the lawful use and actual tenancy arrangements first. Treat any prospective rent as a separate scenario with vacancy, repairs and other relevant costs; do not use a seller’s gross rent claim to turn today’s cash shortfall into apparent affordability. Read the ownership and budget comparison alongside the viewing notes.
Ask for evidence that survives the viewing
- A plan and a clear explanation of any changes from the approved arrangement.
- A written inventory of fittings included in the sale, identifying any items owned by an existing tenant.
- Relevant MCST information on access, moving, renovation and tenant registration.
- If tenanted, documents needed for a property lawyer to assess possession, deposits and obligations at purchase. Contact Lin Xuan or Ade for an introduction.
- A list of unresolved condition issues for a suitably qualified professional to inspect.
For a proposed letting, check URA’s current private residential rental rules before relying on income. Separate doors do not establish a separate occupancy allowance or permission for short stays. This checklist also does not establish any executive condominium’s HDB eligibility or rental position.
Your viewing notes should end with a decision: acceptable as seen, acceptable only after a specific point is verified, or unsuitable for your routine. A useful reason to walk away might be that the main section cannot fit your dining table without blocking access. That is more informative than a generic score for “flexibility”.
Updated 25 October 2026. Earlier unsupported valuation, rental-return, tax and financing claims remain withdrawn. The worked budget above is illustrative and does not establish a unit’s rental eligibility.
Photograph: Singapore River at Robertson Quay, 14 August 2022, Wzhkevin. Source: commons.wikimedia.org/wiki/File:Singapore_River_at_Robertson_Quay_-_2022-08-14.jpg. CC BY-SA 4.0: creativecommons.org/licenses/by-sa/4.0/. Display cropped to fit. Neighbourhood context, not a photograph of a renovation or dual-key interior.
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