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YieldKey Reply · For UK estate & lettings agencies

A tenant messaged you at 9pm on a Saturday. Nobody replied until Monday.

She didn’t wait. She enquired on four other properties that evening, and the first agent to reply got the viewing.

YieldKey Reply is the out-of-hours desk you can’t hire. Every enquiry answered in under 60 seconds, qualified, and booked into your CRM.

Watch it answer your enquiryBook a demo

Paste a real one from your inbox. No email address, no slide deck.

YieldKey Reply
Illustrative conversation
00:00·Rightmove
Enquiry received
Sarah K. · 2-bed flat, Hackney. Budget £2,400 pcm.
00:42·YieldKey · WhatsApp
Hi Sarah, thanks for the enquiry on the Wilton Road flat. When are you looking to move?
Example flow · 3m 18s

The full example

Illustrative conversation · 3 minutes 18 seconds end-to-end

  1. 00:00 · Rightmove

    Enquiry received

    Sarah K. · 2-bed flat, Hackney. Budget £2,400 pcm.

  2. 00:42 · YieldKey · WhatsApp

    Hi Sarah, thanks for the enquiry on the Wilton Road flat. When are you looking to move?

  3. 01:15 · Sarah K.

    End of January ideally, our tenancy is up on the 31st.

  4. 01:16 · YieldKey · WhatsApp

    That fits, it’s available from the 20th. Would it be just you moving in, and are you working full time?

  5. 01:58 · Sarah K.

    Me and my partner, both full time.

  6. 02:01 · YieldKey · WhatsApp

    Great. Referencing for this one is a combined income around £72,000 and a standard credit check. Comfortable with both?

  7. 02:40 · Sarah K.

    Yes, no problem at all.

  8. 02:43 · YieldKey · WhatsApp

    Perfect. Tom can show you around Thursday at 5pm, or Saturday at 11am. Which suits?

  9. 03:05 · Sarah K.

    Thursday 5 works.

  10. 03:18 · YieldKey · Calendar

    Viewing booked

    Thursday, 17:00 · Negotiator: Tom · Qualified: timing, household, income, credit · Written back to the CRM.

Built for
RightmoveZooplaReapitAltoWhatsAppGoogle CalendarMicrosoft 365
The problem

The lead was never lost. It just went cold.

Rightmove and Zoopla take their money whether anyone answers or not. The enquiries arrive at 8pm, at 10pm, on Sunday afternoon, and while every negotiator is out on viewings and can’t touch a phone.

Then they sit. Not because your team is lazy, but because there is no shift covering the hours when buyers actually message.

By the time someone opens the inbox on Monday, the buyer has already spoken to somebody else. Not the best agent in town. The first one to reply.

That’s the whole contest now. And it’s the one shift in your business that nobody works, because nobody wants that shift, and you can’t hire someone who does.

The first reply gets the viewing.

229min
The average time a UK agency took to answer a portal enquiry in a 2023 mystery-shopper study, counting business hours only.
Homeflow, 2023
3 in 10
Rental enquiries in the same study that never received a reply at all.
Homeflow, 2023
The wider speed-to-lead research · US studies, phone response to web leads
21×
More likely to qualify a lead replying within 5 minutes vs. 30.
Lead Response Management Study, Dr James Oldroyd, 2007
+391%
Conversion uplift when responses happen within 60 seconds.
Velocify lead response study, 2013

And that clock only runs in office hours. After six, at weekends, and every hour your negotiators are out on viewings, nothing is being counted at all.

What it does while your branch is shut.

Budget. Timescale. Chain. Mortgage in principle. Whether they’ve already viewed it. Whether they’ve got something to sell. The questions your best negotiator asks on a good day, asked every time, including at 11pm on a Saturday.

YieldKey ReplyIllustrative example
Wilton Road · Lettings enquiry

“Me and my partner,
both full time.”

Move-in
End of January
Household
Two people
Employment
Both full time
Income & credit
Comfortable with both
The qualifying answers stay with the enquiry.
Try it

Give it a real enquiry.

Don’t take our word for it. Paste something from your inbox and see exactly how Reply would handle it, live, the way it would while your branch is shut.

Use an example:
Real AI. Nothing pre-written.
Reply

Paste an enquiry and Reply will do three things:

  1. 01Write the replyIn the agency’s voice, on the channel it arrived on.
  2. 02Show what it understoodThe facts it pulled out of the message.
  3. 03Decide what to qualify nextTiming, household, affordability, then the viewing.

The third one is the part agencies care about. Anyone can write an email.

The shift nobody will work.

You already know the fix: someone covering evenings, weekends, and the hours your negotiators are out on viewings. The reason you haven’t done it isn’t that you hadn’t thought of it. It’s that nobody can staff it economically. A person costs the same at 11pm whether two enquiries arrive or twenty.

So compare us to the hire you’d make if you could.

Hiring for it
YieldKey Reply
A salary, plus cover, plus training
One monthly cost, no headcount
Nobody wants the evening shift
Answers every hour enquiries arrive
Weeks to recruit, weeks to ramp up
Live in under a week
One enquiry at a time
Every enquiry at once
Updates the CRM when they remember
Every thread and answer written back to your CRM
Built by operators

We built this on our own lost leads.

We’re two founders who run Infinity Stays, our own UK property business across long lets and short-term rentals. We could see the enquiries coming in at night and at weekends, and we could see what happened to them by Monday. Nobody was selling a fix that worked, so we built one, and we weren’t willing to point it at our own applicants until it answered the way we would have. It has been answering our enquiries since 2025. Reply for agencies is the same engine: built on our own lettings enquiries, then configured for your stock, sales or lettings, before it ever answers a live buyer.

We’re not a software company that discovered property. It’s the other way round.

Infinity StaysTested inside since 2025
How it works

From mapping to live in under a week.

  1. 01 · Days 1–2 · Mapping

    We learn how you actually work.

    We capture your scripts, qualification process, CRM, calendar, and tools, exactly as your team uses them today.

  2. 02 · Days 2–3 · Training

    The AI learns your tone.

    We train YieldKey on your brand, decision rules, and edge cases. You sign off on every reply pattern before launch.

  3. 03 · 48 hrs from sign-off · Go live

    Connected to your stack.

    Plugged into your portals, CRM, and calendar. Replies start within minutes, monitored by your team.

Straight answers.

Yes. Our name is written as one word, YieldKey, and our official website is yieldkey.ai. If you searched for “Yield Key”, you’re in the right place. YieldKey Limited builds AI products for UK property businesses, starting with YieldKey Reply for estate and lettings agencies.
A chatbot sits on your website waiting for someone to open it, and answers questions about opening hours. Reply works in the opposite direction. It goes out to the enquiry the moment it lands, on the channel the buyer chose, and its job is a qualified viewing in the diary. Different job, different place in your business.
The version that runs on your agency learns your tone from your own past enquiries before it answers a single live buyer. You approve the reply patterns before anyone outside your team sees them.
It doesn’t talk to vendors. Buyer and tenant enquiries only. Anything else stops and goes to a human with the whole thread attached.
Every message, every thread, every booking, in one place. You can step into any conversation at any point and it steps back.
It says so and gets a person, rather than guessing. Guessing is how agencies get complaints.
Yes. Out of hours is where the gap is most obvious, but it answers the 2pm enquiry that lands while every negotiator is on viewings just as fast. You choose the hours: around the clock, or evenings and weekends only.
Both. The qualifying questions differ: referencing and affordability on the lettings side; chain, mortgage in principle, and anything to sell on sales. It asks the right set for the stock it’s answering on, and on the demo call we run it against your enquiries, not ours.
Yes, if they ask, and the answer is straight. Reply introduces itself with a consistent first name so the thread reads like one person rather than a ticket number, and it confirms it is an assistant the moment anyone asks. It never claims to be a named member of your team. What people notice in practice is the speed, not the software.
Monthly rolling after a 90-day initial term. If it isn’t earning its keep, you shouldn’t be locked in.
We connect to your CRM and calendar as part of go-live, in your first week. Reapit, Alto, and most modern systems with an API, including Salesforce, HubSpot, and Pipedrive; calendars are Google Workspace and Microsoft 365. Tell us what you run on the first call and we’ll confirm it before you commit.
Under a week from the first call to answering real enquiries. You send us a set of past enquiries, we train it, and you approve what it says before it says it to anyone.
You do. It’s your inbox, your CRM, your buyers. We’re processing it for you, not collecting it.

See it on one of your own enquiries.

Fifteen minutes. You’ve seen it answer cold: the call is about your tone, your stock, your CRM, and the edge cases you already know it will meet.

Book a demoTry it on an enquiry first

Questions first? hello@yieldkey.ai. A person reads it.