The evidence behind the deal — not the story around it.
Vetta finds, validates and manages UK property deals on a single underwriting record. The valuation is a governed machine-learning model — the same class of model banks and insurers underwrite with — not a language model asked for an opinion.
Costs, value, cash, scope, rent, contracts and stress are each checked independently, then the expected-loss engine prices what could go wrong. What reaches your investor is a risk-adjusted profit, not a headline.
Measured on England & Wales sales from July 2025 to May 2026 that the model never saw in training. We publish the 16% that land outside the 20% band, because a provider who only shows you the 84% is selling you a badge. Full performance breakdown →
Every other model values the house as it stands today.
Hometrack, Rightmove and Zoopla all state plainly that they cannot see condition or planned works. So does every AVM built on comparables alone — which means they price the pre-works local market. A refurbishment is the entire point of your deal.
We built a proprietary refurbishment-outcomes dataset: hundreds of thousands of properties with independently evidenced renovation history, tying what was actually done to what the property then actually sold for. That is the input no comparables feed contains.
See the realised-value benchmark521 post-renovation resales the model had never seen, all completing after the training cut-off — properties that demonstrably were refurbished, which is the only question this product asks.
Find it. Prove it. Run it.
The same underwriting record follows a property from the listing you first looked at to the tenancy you are still managing five years later. Nothing is re-keyed, and nothing is re-assumed.
Screen a whole patch before anyone else has read the listing.
Stop paying for lead lists everyone else already has. Scan a whole local authority, rank what is worth a viewing, and know the numbers before you pick up the phone.
Independent evidence, in under thirty minutes.
Hand your investor independent evidence instead of your own spreadsheet. Faster to a yes — and where a check flags, you know what to renegotiate before you proceed.
Own the portfolio, not the admin.
Keep the client after completion. Hand over a managed asset whose record already holds everything you underwrote, and stay in the relationship instead of exiting at exchange.
We are not a deal sourcer.
We do not find deals, package them, or take a view on whether you should buy one. We are paid the same whatever a deal’s checks surface, so nothing in our fees moves with the result. Our product is the evidence, and it is worth nothing to us if it bends.
Everyone is optimistic about their own deal — that is human, not a character flaw. Independent validation exists because optimism is normal, in exactly the way an audit, a survey or an EPC exists.
Read our underwriting philosophy →Straight answers, first time.
The questions people actually ask before they sign up, answered without hedging.
What is Totwell?
Totwell is the short name people may use for Totwell Vetta, an independent UK property deal validation service.
What is Totwell Vetta?
Totwell Vetta is an independent UK property deal validation service. It organises evidence and assumptions, runs structured calculations and downside scenarios, and flags concerns or evidence gaps for the parties to consider. It does not source or sell deals.
Is this an AI or LLM tool?
No. The valuation uses a classical supervised machine-learning model, trained, held out, calibrated, versioned and documented. Arithmetic outputs are computed deterministically.
How accurate is the model?
The published evidence page reports model accuracy by price band and dataset, including the limitations and observations outside the headline thresholds.
What exactly does a validation check?
A validation reviews acquisition costs, expected value, cash required, scope of works, rent and running costs, relevant documents, evidence provenance and downside scenarios.
Does Totwell approve or reject property deals?
No. Totwell does not make an investment decision, pass or fail a deal, or recommend that a party proceeds. It highlights concerns, missing evidence and questions that may need to be resolved.
What does a low or negative risk-adjusted profit mean?
It is a risk signal produced from the assumptions and downside scenarios available. The parties should review the underlying evidence and make their own decision; it is not a recommendation or instruction.
What does it cost and how long does it take?
See the pricing page for current validation and workspace pricing. Timing depends on the evidence supplied and the checks required.
Are you regulated by the FCA?
Totwell Vetta is not authorised or regulated by the Financial Conduct Authority and does not provide financial, investment, tax or legal advice.
How are you independent if customers pay you?
The workflow is designed to make evidence, assumptions, calculations and limitations visible to the people already involved. Totwell Vetta does not find, package or sell property deals.
How is this different from a mainstream automated valuation?
Automated valuations generally estimate the existing local market. Totwell Vetta combines valuation evidence with a structured review of the proposed deal, its costs, rent, documentation and downside assumptions.
How do I assess risk on my property deal?
Validate the purchase price, refurbishment scope, expected value, rent, finance assumptions, cash burn, documentation, evidence provenance and downside scenarios.
What is property due diligence?
Property due diligence means checking whether a proposed deal is supported by independent evidence: pricing, comparable values, costs, rents, documents, finance assumptions, planning context and realistic exit scenarios.
Great deals deserve independent evidence.
Run a real address through the model, see the working, and decide for yourself. Two quick checks are on us.