One number, one rule: how easily could you sell? Here is exactly how we answer it — in plain English first, then the full math. No black box. Every grade figure traces to registry data anyone can re-derive.
A community where 500 homes resold last year is far easier to exit than one where 5 did. The Ridge grade is that idea — real resale activity — made fair and comparable across all of Dubai. A higher grade means a deeper, busier resale market, so if you ever need to sell, there are real buyers. Nothing more, nothing less.
Completed homes that actually changed hands on the open market — not off-plan launch hype.
A wave of new towers completing isn't real demand. We discount supply-heavy areas so they can't look more liquid than they are.
More genuine resale depth → a higher grade, from Aaa (deepest) down to Caa (thinnest).
Same letters you know from credit ratings. A community grade is on an absolute scale; a building grade ranks it among all Dubai towers — why they differ →
A cheap, busy market out-grades an expensive, quiet one — and that's the point. Prestige and price show up in our PSF and yield figures, never in the grade. We earn no commission, list no property, and take no fee on any deal — so the number has no reason to flatter anyone. It answers the one question an owner actually cares about: if I needed to sell, is there a real, repeating market here?
We count only secondary (Ready) resales over the trailing window and deliberately exclude off-plan from the depth count — a launch selling out off-plan proves primary demand, not that you can exit later. Off-plan enters in one place only: the maturity discount. Source: land-registry records, AED, May 2025 – June 2026.
Why discount maturity? A handover wave makes a brand-new district look liquid — thousands of first-sales and quick flips. Maturity (resales ÷ off-plan) catches it: where new supply dwarfs true resale, the score is marked down so supply can't masquerade as exitability.
A community is graded on its absolute liquidity score; a building by where its liquidity ranks among all ~2,118 Dubai buildings. One tower trades far less than a whole district, so scoring buildings on the community scale bunched them all at the bottom — the percentile fix lets the most-traded towers earn Aaa/Aa and actually separates them. A building "Aa" means top-tier among buildings, like a corporate Aaa and a sovereign Aaa each rated within their own universe.
| Grade | Threshold | Meaning |
|---|---|---|
| Aaa | 84+ | Deepest, most liquid |
| Aa | 74+ | Very deep & stable |
| A | 64+ | Established, liquid |
| Baa | 55+ | Solid mid-market |
| Ba | 46+ | Adequate, thinner |
| B | 38+ | Shallow |
| Caa | < 38 | Thin / early |
| Grade | Percentile | Meaning |
|---|---|---|
| Aaa | top 2% | The most-traded towers in Dubai |
| Aa | next 7% | Very deeply traded |
| A | next 14% | Established, liquid |
| Baa | next 22% | Solid mid-pack |
| Ba | next 25% | Adequate, thinner |
| B | next 18% | Shallow |
| Caa | bottom 12% | Thinnest-traded |
Bands re-calibrate each monthly refresh as the building cohort shifts. Thinly-traded buildings (under ~15 resales) are most sensitive — one extra sale can cross a band — so weight 20+-resale grades most heavily.
The pure liquidity grade above stays exactly as it is — that purity is the point. The Investment Grade sits on top of it: a published, weighted blend of five normalised dimensions, every component shown on the page so it's fully reproducible. It never replaces the liquidity grade.
Weights renormalise to whatever dimensions a place has. Price-stability = how tight and consistent its resale prices are (an efficient market prices steadily). A building inherits its community's location dimensions and contributes its own liquidity — so two towers in one community can score differently on what truly separates them: how actively each one trades.
Ridge Accessibility — traffic-aware drive-time from each community to Dubai's key hubs (DIFC, Downtown, DXB, Marina and more), percentile-ranked across communities into a 0–100 score and an A+–D band. Ridge Amenity density — a weighted count of everyday amenities (metro, schools, supermarkets, healthcare, parks, retail) within 1.5 km of the community centre. Both are derived from Google Maps Platform data and stored as our own scores only; they feed the Investment Grade and are shown beside it — never inside the pure liquidity grade.
Alongside the grade we publish, where the data supports it: sale PSF (median resale AED/sqft), villa PSF, and net yield = (annual rent PSF − service-charge PSF) ÷ sale PSF, from registered rents and service charges. These carry prestige and income — kept deliberately separate so they never inflate the liquidity grade. Where coverage is thin, the figure shows "—" rather than a guess.
Beyond a single median, we publish a stratified median price index so a change in the mix of what sold (more villas, more off-plan, larger units) cannot masquerade as a change in price. Two independent series, never blended: RDRI — Ridge Dubai Ready Resale Index (ready/resale transactions) and ROPI — Ridge Off-Plan Pipeline Index (off-plan). Both are served at /api/ridge_index.
Construction. Each transaction is placed in a stratum of community × property type × bedrooms. Within each stratum-month we take the median AED/sqft, winsorised at the 1st/99th percentile; strata are combined with fixed base-period weights (a Laspeyres-style basket). Any stratum with fewer than three prints in the base or the current month is dropped and its weight renormalised out, rather than allowed to move the headline. Prices outside a published 250–8,000 AED/sqft band are excluded. The trailing partial month — still registering — is trimmed and disclosed. A ±1 standard-error band is computed by a seeded (reproducible) stratified bootstrap, and a release is labelled low confidence when that band is wide.
Base & revisions. The index is rebased to the first month of the available window (currently May 2025 = 100). It is preliminary: as the window extends the base can move and values firm up as late registrations land — a mix-controlled current-market index, not yet a fixed-base long-run benchmark. Point-in-time values are available via /api/ridge_index?as_of=YYYY-MM; revisions follow the published revision policy. The long-run headline city resale index (2002→today) is shown separately on the index page.
A rating you can stress-test is a rating you can trust. Every grade figure is reproducible from the same registry data, baselines included, re-run each refresh; asking-side overlays are third-party-sourced and labelled as such — if the grade ever stopped tracking realised liquidity, we'd publish that too.