Methodology

Nguyên tắc cốt lõi

• Authoritative data only. Every number comes from a Singapore government source — URA, HDB, SLA, ACRA, CPF Board, MAS, IRAS. No scraping of listings, no web-crawled estimates.
• Median over average. Price-per-square-foot analyses use the median; averages get skewed by GCB trophy sales and sub-sale outliers.
• Sample-size gates. Any period-over-period comparison requires a minimum of 3 transactions per window. Sparse months show as "—", not noise.
• Published formulas. Every score, every calculator output is explained below or on its own explainer page.

Giá mỗi foot vuông (PSF)

PSF = transaction price ÷ strata area in sq ft, computed from raw URA caveat records. We use median PSF for district, project, and bedroom-mix comparisons. Month-over-month and year-over-year deltas require ≥ 3 transactions in each bucket.

Lợi nhuận cho thuê gộp

Gross yield = (median monthly rent × 12) ÷ median purchase price × 100%. Numerator and denominator are matched on the same granularity: per flat-type for HDB, per bedroom-count for condos, per district for overview pages. Mismatched granularity produces misleading yields; we reject those joins at query time.

Điểm tài sản

Five composite scores are pre-computed nightly for every active condo:

• ShiokNest Score — our overall quality index: building age-adjusted PSF, tenure, amenity density, liquidity. Weights published on the score page.
• Investment Score — 7 weighted factors: price momentum, gross yield, liquidity, MRT distance, lease balance, district growth, en-bloc potential.
• En-Bloc Score — collective-sale likelihood based on land area, plot ratio headroom, age, and transaction density.
• Walkability Score — Haversine distance to 7 amenity categories within 800m (MRT, schools, hawker, mall, park, supermarket, clinic), weighted.
• Profitability Score — % of caveats in the past 24 months where the seller sold at a profit.

Công thức tính toán

All calculators ship with current government-published rates: BSD/ABSD/SSD from IRAS, TDSR/MSR limits and SORA history from MAS, CPF housing withdrawal rules from the CPF Board. Rates are configured in one place (CALC_DEFAULTS) and audited when policy changes. Lease-decay valuations use Bala's Table (SLA).

Làm mới dữ liệu

• URA private caveats — refreshed weekly (5-year rolling window).
• HDB resale and rental — refreshed weekly from data.gov.sg.
• HDB Resale Price Index — quarterly on publication.
• Commercial rental index (Office + Retail) — quarterly.
• ACRA business registry — monthly refresh for the business map.

Giới hạn đã biết

Private caveats lag sale completion by 2–6 weeks; new-launch monthly data lags by about 6 weeks. We publish the as-of date on every chart. For the full set of sources, see the Data Sources page.