How the grade is made.

01 · Read this first

In plain English

Ridge rates one thing: how easily a home could be resold.

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: if an owner needs to sell, there are real buyers. Nothing more, nothing less.

The three steps

02 · The one thing to remember

What each grade means

• Aaa

  Deepest, most liquid — a constant stream of resales; exit almost anytime

• Aa

  Very deep and stable — a strong, reliable resale market

• A

  Established and liquid — sells steadily

• Baa

  Solid mid-market — a healthy, working resale market

• Ba

  Adequate, thinner — it sells, but with fewer buyers

• B

  Shallow — slower to exit; timing matters

• Caa

  Thin or early — few resales; hardest to exit

• NR

  Not rated — under 5 resales; too thin to grade. Ridge publishes no grade rather than an estimate

The letters follow the credit-rating convention. A community grade is on an absolute scale; a building grade ranks it among all Dubai towers — why they differ.

03 · Scope

What the grade is, and is not

It measures resale liquidity. It is not a price, a prestige score, or a forecast.

A cheap, busy market out-grades an expensive, quiet one, and that is the point. Prestige and price show up in the PSF and yield figures, never in the grade. Ridge earns no commission, lists no property and takes 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?

04 · For the analyst

The exact math

Ridge counts only secondary (ready) resales over the trailing window and deliberately excludes off-plan from the depth count: a launch selling out off-plan proves primary demand, not that an owner can exit later. Off-plan enters in one place only, the maturity discount. Source: Dubai Land Department registered transactions, AED, window 2025-05 → 2026-10.

The liquidity score

Why maturity is discounted. 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 cannot masquerade as exitability.

05 · For the analyst

Two calibrations: community and building

A community is graded on its absolute liquidity score; a building by where its liquidity ranks among all 2,440 rated 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 calibration lets the most-traded towers earn Aaa/Aa and actually separates them. A building "Aa" means top-tier among buildings, in the way a corporate Aaa and a sovereign Aaa are each rated within their own universe.

Community bands · absolute liquidity score

Building bands · rank among all Dubai towers (v1.5)

Bands re-calibrate each monthly refresh as the building cohort shifts. Thinly traded buildings (under ~15 resales) are the most sensitive, since one extra sale can cross a band, so grades on 20 or more resales carry the most weight.

06 · The composite

The Ridge Investment Grade

A second, optional read for investors: the liquidity grade plus location and income, in one transparent number.

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 is fully reproducible. It never replaces the liquidity grade.

Weights

• Liquidity 35%
• Accessibility 22%
• Amenity 15%
• Yield 16%
• Price stability 12%

Weights renormalise to whatever dimensions a place has. Price stability is 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.

07 · Data: Google Maps Platform

Location indices

Ridge Accessibility is 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 is 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 Ridge's own scores only; they feed the Investment Grade and are shown beside it, never inside the pure liquidity grade.

08 · Separate from the grade

Prices and yields

Alongside the grade Ridge publishes, where the data supports it: sale PSF (median resale AED per square foot), villa PSF, and net yield = (annual rent PSF − service-charge PSF) ÷ sale PSF, from registered rents and service charges. These carry prestige and income and are kept deliberately separate so they never inflate the liquidity grade. Where coverage is thin, the figure shows "—" rather than an estimate.

09 · Preliminary

The stratified price indices: RDRI and ROPI

Beyond a single median, Ridge publishes 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, the Ridge Dubai Ready Resale Index (ready/resale transactions) and ROPI, the 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 Ridge takes 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 registered transactions 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 and 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 current-market index that controls for mix, 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 series, the Ridge Dubai Resale Price Index (RDRPI, base 2014 = 100), is a monthly median of registered resales from 2002 onward and is a different series from RDRI; it is published on the index page and printed in the band at the top of every page.

10 · For the analyst

Validation

The grade is a stable, reproducible measure of liquidity, and liquidity itself is highly persistent. The tests below show exactly that, and no more.

A rating that can be stress-tested is a rating that can be trusted. 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, Ridge would publish that too.

11 · Limits

What this method does not do

• It does not rate prestige, quality, or whether a price is "good" — only how liquid the resale market is.
• It does not forecast prices. It measures the trailing window; it does not predict the next one.
• It does not grade off-plan-only projects with no secondary market — those stay NR until real resales appear.
• It is not investment advice. It is indicative market intelligence.

12 · The asking-side firewall

Independence

Ridge earns no commission, lists no property, and takes no fee on any deal. The grade has no commercial input, which is the entire point. Every grade input traces to registered transactions anyone can re-derive; asking-side validation overlays (PropertyFinder) and context indices (Google) are separate and labelled. Hard rule: no asking-side signal — gap, inventory, asking momentum or any PropertyFinder-derived measure — ever enters a Ridge grade or the index; they are surveillance signals that can only bring a review forward, never move its outcome. This firewall is enforced mechanically: the publish gate checks the index and ratings source strings for asking-side provenance on every refresh. Ridge grades its own house as coldly as anyone's. The full charter is at /governance.

13 · Versioning

Methodology versions

One published, versioned rulebook. When the method changes, the version increments and the change is recorded here; grades are never quietly re-cut. The current method is v1.5, the version stamped on every rating document, the footer and /api/health.

Effective dates are as recorded in the rulebook at each release. Material methodology changes are announced ahead of implementation under the governance charter.