Sentinel
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Sentinel
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YOUR AI CO-INVESTOR

I’m Sentinel.
I unlock the deal inside any property.

Find where the value is, test the strategy, and spot what could bite you before you commit.

Test Sentinel Now For Free
7 days free on every plan.
Built on 20 years of investing and 200+ investors coached by Rob Stewart, former RAF fast jet and tactics instructor.
THE PROBLEM

Everyone can see what you can see.

Property data tells you what is happening. Judgement tells you what to do about it.

SOURCING TOOLS
Find the property.
PROPTECH
Tells you what it's worth.
SENTINEL
Engineers the deal.

Same listings, same comparables, same yields as everyone else. The edge was never in finding it. It's in what you do with it once you have.

THE MESSY 90%

Data works for the clean 10%. Sentinel simplifies the rest.

A new-build flat with thirty comparables is easy to price. A mixed-use building with an empty shop, an awkward lease or a planning question isn't, and that's most of the market. Most proptech hands you more data. Sentinel cuts through the complexity by judging the three things every deal depends on.

Every deal sits where three things meet.

THE ASSETA LINK TELLS ME

The property, the market, and where the opportunity and the risk sit.

THIS IS WHERE PROPTECH STOPS.SENTINEL TAKES OVER.
THE VENDORI TELL YOU WHAT TO ASK

Why they're selling, and where they might flex beyond price.

THE INVESTORYOU TELL ME ONCE

Your capital, experience, goals and appetite for risk.

THE DEAL

Where all three meet. A property is only a good deal for someone, on some terms.

HOW SENTINEL WORKS

One method. Every property.

01
Find.

Find the deal inside any property, and know where to look for the next one.

DEAL INTELLIGENCE, CONCEPT ENGINE
02
Engineer.

Shape the price, use and terms until the deal works for you. Or walk away.

APPRAISAL ENGINE, DEAL PIPELINE, NEGOTIATION ENGINE
03
Execute.

Turn the thesis into offers, negotiation and next actions, and stay on track to completion.

PRIORITY ENGINE, PORTFOLIO INTELLIGENCE
Now watch it work on a real building.
COULDN'T BE LET
4 TENANCIES, BELIEVED PROTECTED
ON A REAL BUILDING

130 Foregate Street, Chester.

One of Rob's own deals, bought before Sentinel existed, and since run through Sentinel to show what it sees. Keep scrolling to watch each stage play out on the building.

01 FIND

Find the deal inside any property.

Paste a listing, an auction lot or an off-market lead. I read it the way an experienced investor would, and tell you where the value is and what could bite you.

HERE, ON PAPER
  • Failed at auction twice.
  • A ground-floor unit the owners couldn't let.
  • Four tenancies the owners believed were protected.
ENGINES: DEAL INTELLIGENCE, CONCEPT ENGINE

The best property deals aren't simply found.

They're engineered.

02 ENGINEER

Where is the deal?

Sometimes it's in the price. Sometimes in a different use or strategy. Sometimes in the terms.

PRICEUSETERMS
HERE, THE UNLOCK
  • The tenancies: Section 20 notices, discovered on page 40 of the legal pack, proved they were ASTs, not protected, so they could be re-engineered to increase the income. Sentinel uncovers this in seconds.
  • The unit nobody could let: white box it.
  • The vendor: three months of tracked signals on the seller's position. When it shifted, the offer was already ready.
ENGINES: APPRAISAL ENGINE, DEAL PIPELINE, NEGOTIATION ENGINE

Then I test it against you.

Your capital, experience and goals, because a deal that works for one investor can sink another.

AND SOMETIMES THERE'S NO DEAL42 / 100

Offers over £290,000 is not commercially supported by the available evidence.

Unattractive On Current EvidenceREAL SENTINEL OUTPUT, ANOTHER PROPERTY
03 EXECUTE

A deal doesn't end with the spreadsheet.

Information is incomplete. Assumptions shift. Negotiations stall. I turn the thesis into offers, negotiation and the next action, and I tell you when you're drifting before it costs you.

ENGINES: PRIORITY ENGINE, PORTFOLIO INTELLIGENCE

Every deal makes the next decision better.

Each deal is recorded: what you considered, what you assumed, what you chose and what happened. Over time it becomes your decision infrastructure.

Bought£345,000
All-in£425,000
Valued£775,000
Equity created£350,000
Income now£72,000 a year
OBSERVE, ORIENT, DECIDE, ACT

Built on the decision loop from the cockpit.

OBSERVE
ORIENT
DECIDE
ACT
OBSERVE

I watch what you look at, every property and every pipeline, against your gold mine areas.

ORIENT

I put it in context: your capital and strategy, the vendor's position, the local market.

DECIDE

A clear thesis and the deal worth making. Or the reason to walk away.

ACT

The offer, the negotiation and your next move. And a flag the moment you start to drift.

Then it loops. Every decision sharpens the next one.

THE JUDGEMENT SENTINEL IS BUILT FROM

Five buildings. Five different unlocks.

These are Rob's own deals, done before Sentinel existed. Not one of them was a deal nobody else could find. The difference was the judgement, and that's what Sentinel encodes.

130 Foregate Street, Chester — the building Sentinel appraised

01

130 Foregate Street, Chester

One page in the legal pack.

Saw

A tired mixed use freehold. Retail unit empty five years, tenancies dating to the nineties, assumed protected. Failed at auction twice.

Unlock

One page in the legal pack proved the tenancies were not protected. Everyone else assumed. Nobody read it. It now earns £72,000 a year.

Bought£345,000
All in£425,000
Valued today£775,000

Equity created

£350,000

What Sentinel reads

Sentinel reads the legal pack, not just the listing, and flags where the paperwork contradicts what the listing implies.

The Kings, Chester — the building Sentinel appraised

02

The Kings, Chester

What the vendor needed was not what they were asking.

Saw

A bed and breakfast, fourteen ensuite rooms. Two years on the market. Everyone who circled it wanted a lease option.

Unlock

The vendors were elderly and needed £450,000 for a bungalow, not £950,000. Bought direct, balance deferred and paid from the building's own income. Now an HMO earning £10,000 a month.

Asking£950,000+
Bought£765,000
Valued today£1,100,000

Equity created

£335,000

What Sentinel reads

Sentinel prices the vendor's actual position rather than the asking price, then returns an offer ladder that includes deferred structures.

The Phoenix Club — the building Sentinel appraised

03

The Phoenix Club

A plan that paid for its own build.

Saw

An empty working men’s club out of probate. Nobody could see what it was for, and the conversion cost more than most buyers wanted to find.

Unlock

The ground floor was sold to fund the conversion above it, so the scheme funded its own build.

Bought£186,000
Sold£715,000

Gross value delivered

over £1,000,000

What Sentinel reads

The Concept Engine tests strategies most buyers never model, including the ones that pay for themselves.

Watergate Street, Chester — the building Sentinel appraised

04

Watergate Street, Chester

The income was frozen. The value was not.

Saw

Five flats earning £450 a month. Not each. Between them. Rents frozen for thirty years, so anyone pricing it off its income priced it as a liability.

Unlock

Controlled before it was owned, bought through the company at £65,000 below the property’s own valuation, refinanced on day one.

Bought£280,000
Valued£435,000

Recycled on day one

£250,000

What Sentinel reads

Sentinel prices the income schedule against real market rents and values the building on reversion, not on passing rent.

Whitefriars, Chester — the building Sentinel appraised

05

Whitefriars, Chester

Being ready when the second sale collapsed.

Saw

Two commercial units, empty five years. Under offer twice, fell through twice. I wanted it both times. The figures never worked.

Unlock

Timing. When the second sale collapsed, the vendor's position had changed and I had already appraised it twice. Two residential units built under PD.

Asking£495,000+
Bought£435,000
All in£850,000
Exit£1,100,000

Value unlocked

£250,000

What Sentinel reads

Sentinel keeps the deals you rejected in your pipeline and tells you when the reason you walked away has changed.

Rob Stewart, founder of Sentinel, on site in a building mid-renovation
THE FOUNDER

"There's no shortage of deals. There's a shortage of judgement."

Rob Stewart flew fast jets in the RAF, then trained the pilots who came after him as a qualified flying instructor and tactics and weapons instructor. He designed the RAF's fast jet training syllabus at Ascent Flight Training, and has spent 20+ years investing in UK property and a decade coaching 200+ investors.

The loop at the heart of Sentinel is the same one he flew by and taught: observe, orient, decide, act.

Read Rob's story
START WITH SENTINEL

Start with Sentinel. Choose the plan that fits you.

Create your account to start finding and testing deals.

Test Sentinel Now For Free
WHERE MOST PEOPLE START
Core£27 / month

Sentinel's judgement on your deals.

MORE CAPACITY
Pro£97 / month

More judgement capacity, Pro features and training.

WITH COACHING
Elite£197 / month

Academy access and coaching.

7 days free on every plan. Prices exclude VAT.See the full breakdown
QUESTIONS

A few things you might want to know first.

Do I need a deal ready to start?

No.

If you already have one, great. Start there. If you don't, find any live property that interests you and bring that instead.

It doesn't need to look like a great deal. That's rather the point. Sentinel helps you work out whether an ordinary property can become a deal, and at what price, structure or strategy.

What happens in the 7-day free trial?

You get seven days inside Sentinel, with the full platform available from day one and enough judgement credits to put up to five real deals through the engine.

Bring a property you're looking at now, one you've already rejected, or go and find one.

If Sentinel isn't valuable enough to keep, cancel before your trial ends and you won't be charged.

How much does Sentinel cost after the trial?

Plans start at £27 a month.

Core is £27/month, Pro is £97/month and Elite is £197/month. Every plan gives you access to the full Sentinel platform; higher tiers increase your judgement capacity and add additional training, Academy access and coaching.

Your first seven days are free, so you can put Sentinel to work on your own deals before deciding whether it's worth paying for.

I already use Property Filter, PropertyData or another sourcing tool. Do I still need them?

It depends what you use them for.

If you use Property Filter to find opportunities, keep it. Sentinel isn't trying to replace your sourcing tool yet. Property Filter is very good at getting potential properties in front of you. Sentinel takes over when you ask: what do I actually do with this one?

If you use PropertyData primarily to research and appraise individual deals, you may find you need it far less. Sentinel already pulls relevant PropertyData information directly into its analysis, so you're not jumping between platforms collecting data and then trying to interpret it yourself.

Sourcing tools find opportunities. Data tools give you information. Sentinel turns the opportunity and information into an investment decision.

Is Sentinel suitable if I'm new to property?

Yes, but Sentinel won't simply make decisions for you blindly.

It shows you the thinking behind the deal: where the value may sit, which assumptions matter, what the numbers support, what you can afford to pay and what you should do next.

If you're earlier in your property journey, Pro and Elite also include structured training to build the knowledge behind those decisions.

The aim isn't to make you dependent on Sentinel. It's to help you make better investment decisions, faster.

Is Sentinel just ChatGPT for property?

No. AI is part of Sentinel, but the AI model isn't the product.

Ask a general-purpose AI about a property and it starts with whatever you type into a blank chat. Sentinel starts with an investment system: your strategy, target returns, property data, appraisal assumptions, pipeline, previous decisions and the evidence attached to the deal.

Its specialist engines work across the investment process: understanding the opportunity, testing strategies, appraising the numbers, structuring an offer, supporting negotiation and driving the next action.

Think of ChatGPT as intelligence you can talk to. Sentinel is an investment operating system built to put intelligence to work.

Is my deal and portfolio data private?

Yes. Your deals, documents, appraisals and portfolio information aren't visible to other Sentinel members.

Sentinel uses this information to provide deal-specific analysis and judgement, but your individual investment information remains private to your account.

Does Sentinel find properties for me?

Not yet. Today you bring the property and Sentinel finds the deal inside it.

Paste a listing, an auction lot or an off-market lead and Sentinel reads it, judges it and engineers it around you. It also learns your gold mine areas, so you know where to look for the next one.

Sourcing is coming. Until then, keep using the sourcing tool you already have and let Sentinel take over from there.

Unlock the deal inside any property.

Sign up and put Sentinel to work on your next deal.

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