"BMV" gets thrown around a lot in property investing, usually without any real definition behind it. We built PropertyAlert around a specific, checkable answer to "how BMV is this deal, actually?" — here's exactly how that number is calculated.
The Problem With "Below Market Value" as Most People Use It
Ask ten property investors what "BMV" means and you'll get ten different answers — below what the agent said it's worth, below what the seller paid, below a gut-feel sense of the area. None of those are wrong exactly, but none of them are consistent either, which makes the term almost useless for actually comparing one deal against another.
We wanted a number that meant the same thing on every listing, in every postcode, every time — so we built our investment score directly from real transaction data instead of opinion.
How the Investment Score Is Calculated
Every property we track gets compared against its own postcode sector benchmark — the median price per square foot that comparable properties of the same type have actually sold for, taken from Land Registry price-paid records, adjusted for bedroom count and time since sale so a comparison from two years ago doesn't silently distort today's number.
The listing's asking price per square foot is measured against that benchmark, and the percentage discount is mapped onto a 1–10 scale: a property priced roughly in line with its local benchmark scores low, and a property priced well below what comparable local sales say it should be worth scores high. A score of 8 or above means the asking price sits meaningfully below real, recent comparable sales in that exact postcode sector — not a subjective read, a data comparison.
This is deliberately narrower than "is this a good deal overall." A property can have an excellent investment score and still be a poor investment for other reasons — bad EPC rating, high service charge, weak rental demand in that specific street. That's why we don't stop at investment score alone.
Investment Score Is One Third of the Full Picture
On PropertyAlert, investment score feeds into a wider deal score alongside two other independently calculated signals:
- Motivation score (1–10) — how urgently the seller appears to want to sell, based on real signals in the listing itself: probate, "reduced," "cash buyers only," how long it's been on the market, and similar keyword and behavioural flags. A property can be fairly priced but still move fast because the seller genuinely needs a quick sale.
- Yield score (1–10) — where the property's gross rental yield falls, from Poor (under 4%) up to Exceptional (10%+), based on realistic local rent estimates rather than an optimistic asking figure.
The final deal score weights these as investment score (50%), motivation score (30%), and yield score (20%) — reflecting that a genuine price discount matters most, but a motivated seller and a strong yield both meaningfully change how good a deal actually is once you look past the asking price alone.
Why This Approach, Not a Simpler One
A simpler system — just flagging anything priced under the average asking price in a postcode — would catch a lot of noise: undersized properties, poor-condition homes, or listings in objectively worse micro-locations within the same sector, none of which are really "BMV" in any useful sense. Benchmarking against real sold prices, adjusted for property type and recency, filters most of that out before a listing ever reaches you.
It's also why the score updates continuously rather than being set once at listing time — postcode benchmarks themselves shift as new sales complete, so a listing's investment score can move even if its asking price never changes.
See It In Practice
Every live listing on PropertyAlert's deals dashboard shows its investment score, motivation score, and yield score side by side, alongside the actual postcode benchmark it was measured against — nothing hidden behind a single opaque "deal rating." For where these scores are currently clustering most heavily across the UK, see our roundup of the postcode sectors with the most BMV activity right now.