How do I find out if a UK house is overpriced?

Paste the Rightmove, Zoopla or OnTheMarket URL into Sienna. I compare the asking price to HM Land Registry sold prices within 0.25 miles of the property in the last 24 months and tell you the fair value and how much you may be overpaying — free.

What is a Sienna Score?

A 0–100 score showing how good a buy a listing is. 70+ means strong value vs recent comparables, 50 is fairly priced, under 35 means walk away or negotiate hard.

What data does Sienna use?

HM Land Registry Price Paid Data (actual sold prices) within 0.25 miles of the property, plus listing details extracted from the URL — asking price, property type, bedrooms, EPC, days on market and price reductions.

Is Buy with Sienna free?

Yes. There is no charge for the report. The Mortgage Genie is paid by lender commission only if you choose to use our mortgage advisers — you are under no obligation.

Does Sienna work on Rightmove and Zoopla?

Yes — Rightmove, Zoopla and OnTheMarket are all supported. There is also a free Chrome extension that shows the Sienna Score directly on each listing page.

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Sienna — AI property assistant by The Mortgage Genie

Meet Sienna — new from The Mortgage Genie

Buy Smarter,
Buy with Sienna^®

Paste any UK property listing. Sienna Property Intelligence tells you what it's really worth, what to offer, and how much you could save — in seconds.

Property listing URL

Works with Rightmove, Zoopla and OnTheMarket. No signup needed for the preview.

Real sold-price data

Live HM Land Registry comparables — not asking-price guesses.

Ready-to-send negotiation script

A message you can copy and send to the agent today.

FCA-authorised follow-up

If you want regulated mortgage advice on the purchase, our advisers are here (FCA 754691).

Sienna^® is a trademark of The Mortgage Genie. Estimates are AI-generated using public data and are indicative only. Buy with Sienna is a buying-intelligence tool — it is not regulated mortgage advice or a formal valuation.

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Buy Smarter,Buy with Sienna®

Real sold-price data

Ready-to-send negotiation script

FCA-authorised follow-up

Buy Smarter,
Buy with Sienna^®