Deal Shield
The only buy-to-let appraisal that runs on the listing page itself.
Other tools can run these numbers. You have to go to them, type in an address and an asking price, and do it again for the next one. Deal Shield is already on the page, already filled in, and has an answer before you have typed anything.
It has an answer before you type anything
Every other appraisal tool starts with a blank form. You go to it, enter an address, an asking price and a rent you have guessed, and only then does it tell you anything. Do that thirty times in an evening and you stop doing it, which is why most investors dismiss most properties on instinct.
Deal Shield opens with the appraisal already done. It reads the price, the bedrooms, the property type and the location off the page, and starts the rent from official ONS figures for that local authority — not the headline average, but the figure for that bedroom count and that property type, adjusted for how the asking price compares with the area. Then it says plainly that the figure is an anchor rather than a comparable, and asks you to confirm it.
“What rent would this need?”
When a property misses your target, Deal Shield tells you the rent it would have to achieve to clear it, and how far that is above the local anchor. “Needs £2,730 a month, 16% above the area” is a question you can actually answer by looking at two rental listings. A yield percentage is not.
It refuses to be confidently wrong
Where the anchor implies a yield nobody should trust, it withholds the verdict and the offer price rather than dressing up a guess. We do not model rents or scrape comparables. The appraisal says “rent set by you, against the ONS local figure”, which is a sentence that survives a conversation with a lender.
The number that decides whether a cheap property is actually cheap
A listing shows you the EPC band and nothing else. It does not tell you what that band costs to fix. With a minimum of C proposed for rented homes, the gap between a D and a C is real money, and it lands on the buyer.
Deal Shield finds the property's actual certificate on the open EPC register, reads the measures the assessor recommended, and puts a cost range on getting it to a C. That figure sits in the appraisal alongside everything else, so the deal you are looking at is the deal including the works, rather than the deal before you found out.
Estimates based on the register's own recommended measures. Indicative, not a quote, and not a substitute for a survey.
On every listing you open
Judged against your rule, not a generic one
Set the yield or cashflow you buy at once, and every listing tells you whether it clears it. No retyping your target on each property.
The numbers, filled in
Net monthly cashflow, net and gross yield, and the maximum sensible bid worked out from the cash you actually have, after stamp duty and legals.
Company or personal
One switch changes the whole appraisal, including Section 24 treatment and corporation tax, so you can see which route the deal survives.
Lender stress test
Whether it passes ICR at a stressed rate, the loan that would clear, and where your breakeven sits if rates move against you.
Sold prices and area
Land Registry sold prices nearby, price per square foot, five-year local growth, Article 4 directions and recent planning applications.
Watchlist
Track the ones you are chasing. Deal Shield re-checks the asking price once a day and tells you when one is reduced or comes back on.
Show the workings
Every figure opens up. See the actual arithmetic behind the stamp duty, the interest, the cashflow and the loan the rent supports, with the rules version it used.
Your figures stay yours
Your cash position, rates and assumptions are stored in your browser. They are never sent to us and never sold to anyone.
If you source for clients
Sourcing is not really an appraisal problem. It is a problem of screening forty listings against several different briefs, and then being able to show a client why three of them made the shortlist.
Every client's brief at once
Save a profile per client with their pot, their structure and their target. Each listing then tells you who it suits, without switching profile five times a property. A limited-company buyer and a cash buyer are different deals on the same house, and it prices both.
A report that shows the work
One page for the client: the brief, what met it, and what was considered and rejected with the reason for each. Your logo and business name on it. Every other tool hands over the shortlist; none of them evidences the thirty-seven properties you ruled out, which is the part you were paid for.
The appraisal sits beside the listing
It opens on the property page itself. Set your cash pot once and it carries across every property you look at.
And exports as a deal sheet
A print-ready appraisal to send to a broker, a partner, or a client, with the assumptions it was built on shown at the bottom.
What it costs
Nothing. Deal Shield is free in full, on the Chrome Web Store, while we build it out. If paid plans come later, anyone using it before then keeps what they have.
It covers England and Northern Ireland for stamp duty. Wales and Scotland use different systems and are not modelled yet. It is information to help you appraise a purchase, not financial advice, and the figures are only as good as the assumptions you give it.
What it does with your data
Your deal figures never leave your browser. The extension asks open data services about a property's postcode; it does not tell them who is asking. There is no analytics in the extension, no cookies, and no profile of you. The Deal Shield privacy notice sets out exactly what leaves the browser and why.