Ten signals. One
probability score.
Each of the 549,000+ London residential properties in our database is evaluated against ten predictive signals. Each signal is weighted according to its historical correlation with a sale occurring within the following three to six months. Signals are combined into a single probability score, and properties are classified as High or Medium likelihood, ranked within their London segment (Prime or Outer).
No single signal is definitive. A property with a strong EPC signal may simply be improving for rental. A probate flag does not mean the estate will sell. The model looks for signal combinations — properties where multiple independent factors are pointing in the same direction at the same time.
All data is sourced from publicly available registers. We do not purchase, infer, or model private consumer data.
Long ownership
Properties held by the same owner for 15 years or more show elevated sale probability. Long-term owners have typically accumulated significant equity and are entering the life stages — retirement, downsizing, relocation — most associated with a decision to sell.
Corporate ownership pressure
Properties held through limited companies where there have been recent director changes, regulatory filings, or company dissolution signals are flagged. Corporate landlords and investment vehicles are often under board or compliance pressure to rationalise property assets.
EPC compliance pressure
Properties rated D or below on their Energy Performance Certificate face increasing legislative pressure, particularly for the buy-to-let market. Planned Minimum Energy Efficiency Standards (MEES) deadlines make low-rated properties more expensive to hold, creating a selling incentive.
Planning completion
A completed planning permission — particularly for extensions, loft conversions, or change of use — is a strong predictor of an upcoming sale. Owners who have just finished improving a property frequently proceed to sell within twelve months of completion.
Probate signal
A grant of probate recorded against an address triggers a selling window that typically runs from six to eighteen months post-grant. Inherited properties are among the highest-probability sales in the market — beneficiaries often have neither the need nor the desire to retain the asset.
Electoral roll gap
A property where the registered occupants have recently de-registered from the electoral roll — without a new registration appearing — suggests vacancy or ownership transition. This is often an early signal of a property entering the pre-sale phase.
Council tax vacancy
An active council tax vacancy exemption or discount flags an unoccupied property. Vacant residential properties in London are rarely held vacant by choice for extended periods — vacancy is a leading indicator of sale preparation or inheritance.
No recent listing
Properties that have never been publicly listed, or have not appeared on Rightmove or Zoopla in ten or more years, represent untapped market value. Owners of these properties may be unaware of their property's current worth or may have simply never considered selling.
Rental exit signal
Buy-to-let landlords are exiting the market in significant numbers due to rising mortgage costs, increased stamp duty on additional properties, and regulatory burden. Properties with a history of rental occupancy where this pattern has ceased are flagged as potential landlord exits.
Significant price appreciation
Properties where the last transacted price and estimated current value show exceptional appreciation create a strong financial incentive to sell. Owners sitting on large unrealised gains — particularly in prime London boroughs — are more likely to act when market conditions are favourable.
What the score
means in practice
Properties are classified into two action bands. Both represent elevated probability relative to the London baseline — the distinction is one of timing and confidence, not of absolute certainty.
Act now
Multiple strong signals are present simultaneously. The combination of factors suggests a sale decision is likely within the next three months. These properties receive a personal letter and QR code for immediate portal access.
Watch closely
One or two signals are present, or signals are present but not yet at full strength. These properties are monitored monthly and will typically move to High classification within three to six months if signals develop.
Want to know your
property's score?
If you received a letter from us, your QR code links directly to your personalised portal where you can see the signals we identified for your property. You can confirm, correct, or challenge any detail through our Aime concierge.
If you did not receive a letter but would like to understand how your property scores, please contact us at hello@premonitia.com. Under UK GDPR you have the right to request access to any data we hold about you or your property.