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ChatGPT, the portals, a surveyor, or Flatscope
Four common ways to research a UK flat before you offer, compared fairly. Flatscope is sourced, lease-aware desk research that reads the public record before you spend on a survey. It does not replace a RICS surveyor, who inspects the physical building, and it does not replace your solicitor. ChatGPT is free and instant but cannot cite UK registers for a specific address. The portals show the listing and some sold prices but do no analysis. A surveyor is the gold standard for the building itself and costs accordingly. Flatscope currently supports Rightmove listings in England and Wales only, with Zoopla and OnTheMarket in progress. It is informational software, not regulated legal or financial advice.
| What you get | Flatscope | ChatGPT alone | Rightmove or Zoopla | RICS surveyor |
|---|---|---|---|---|
| Sourced lease, Section 20 and safety check | Yes. Reads lease length and flags the 80-year mark where marriage value has historically applied, the established position now being reformed, so confirm the current rule with your solicitor. Surfaces Section 20 major-works signals, and references the Building Safety Act 2022 and EWS1 in general terms. Every figure traced to a cited public record. | Partial and unreliable. It can explain what a lease or Section 20 is in general, but it has no live access to this flat's lease term, the block's works history or its safety status, and may state figures it cannot source. | No. A listing shows the tenure and sometimes the lease years and service charge as the agent typed them, with no check, no Section 20 history and no safety status. | Partial, from a different angle. A RICS surveyor inspects the physical building and can flag visible defects and some safety concerns, but lease terms, Section 20 consultation and title are usually for your solicitor, not the survey. |
| Sold-price comparables | Yes. Pulls prior sales at the exact unit plus same-building and same-street comparables from HM Land Registry Price Paid Data, and sets the asking price against the area context. | Weak. It may recall rough area prices from training data that can be out of date, and cannot reliably pull verified Land Registry figures for a specific address. | Partial. The portals show some sold-price history for a street, which is useful, but they do not work it into a value judgement for the flat you are looking at. | Sometimes. A valuation survey gives a professional market value, though a standard homebuyer survey is about the building's condition rather than a comparables study. |
| Hallucination risk | Low by design. One model drafts the verdict, a separate model fact-checks every figure against its cited source in a hard-mode pass. Any figure that cannot be traced to a source is flagged, never invented. | Higher. A general assistant can state confident numbers with no source, and there is no second pass checking each figure against a register before you read it. | Low for the raw fields, since the portal shows what the agent entered, but those fields are unverified and can simply be wrong or stale. | Low. A qualified human professional stands behind the report, with professional accountability, though findings still reflect what was visible on the day. |
| Cost | Three full reports a month are free, no card. Solo is £9.99 a month and Together is £14.99 a month for an active search. | Free, or a low monthly subscription for the paid tier. A genuine advantage of using a general assistant. | Free to browse listings and sold prices. | Several hundred pounds and up. A RICS homebuyer survey is commonly around £600 or more depending on the property and the level chosen. |
| Speed | A few minutes per listing, from pasting the link to a finished web report plus a five-page PDF or DOCX. | Instant, which is its strength, but answers are unsourced and tied to whatever you remember to ask. | Instant to view the listing, though you do the comparison and the digging yourself across multiple tabs. | Days to weeks. You book the inspection, it happens on site, then you wait for the written report. |
| What it cannot do | Cannot inspect the physical building, cannot give regulated legal or financial advice, and currently covers Rightmove listings in England and Wales only. You still need a solicitor and a RICS surveyor before you commit. | Cannot cite UK public registers for a specific address, cannot compare a shortlist on consistent metrics over time, and cannot inspect the building or give regulated advice. | Does no analysis, no sourced verdict and no cross-listing comparison, and cannot tell you whether the asking price or lease is reasonable. | Does not research the wider deal for you. The lease terms, title and conveyancing sit with your solicitor, and a survey is usually arranged later, after you have already chosen which flat to pursue. |
The honest verdicts
When ChatGPT alone is enough
If you want to understand what a term means, ChatGPT is genuinely good and free. Ask it what marriage value is, or how Section 20 consultation works, and you will get a solid explainer. The problem starts when you ask about a specific flat. A general assistant has no live access to HM Land Registry, the EPC register or the building-safety registers, so for this address, this lease and this service charge it either declines or guesses. If a number matters enough to change your offer, it needs a source.
When the portal listing is enough
Rightmove and Zoopla show you what the agent typed. Sometimes that includes lease years and the service charge, and the portals show some sold-price history for the street. None of it is checked against the public record, and the listing has no incentive to surface the expensive parts. Many listings leave lease length, the service charge or ground rent as ask agent. The listing is the start of research, not the research.
When you need the surveyor
Always, eventually. A RICS surveyor physically inspects the building and that cannot be done from a desk. The question is sequencing. A survey costs several hundred pounds and happens after your offer is accepted. Desk research that reads the lease signals, running costs and sold comparables first tells you whether this flat is worth that spend at all, and arms you with the questions the survey will not answer.
Where Flatscope fits
Before the offer and before the survey. Paste the Rightmove link and you get a cited report. Sold prices for the building and street from HM Land Registry, the lease position and the 80-year cliff, the service charge against the building type, EPC, building-safety signals and a verdict with a score out of 100. Every figure traced to a public record, and anything the listing omits is flagged as not stated rather than guessed. Three full reports a month are free with no card.
See it on a real flat, not a promise
Three full sample reports are public. Open one, check the citations yourself, then run your own flat. Three reports a month are free, no card.