How much does a custom AI phone agent cost?

Humbrook quotes one fixed price for the whole build. It covers the call logic in n8n, the voice, the connection to whatever the business books in, the testing, and the handover. The price is agreed before the build starts and it does not move once it has been agreed.

That price is quoted by email, and only by email. Humbrook has to know what the business books in and what the calls actually are before naming one, because those two things are what the price is made of. A price published on this page would be a guess about a business Humbrook has not heard yet, and the guess would be wrong in both directions.

The client pays once. There is no setup fee on top of the build, and no monthly retainer for it afterwards.

No minutes are bundled in. Twilio and Vapi bill the client directly, at their own published rates, into accounts the client opens and owns. Those bills never pass through Humbrook and are never marked up, so what the phone costs to run is a line you read on a vendor invoice rather than a line hidden inside a quote.

At the end, the build belongs to the client. It sits in the client's own accounts, on the client's own number, and there is nothing rented back and nothing to cancel.

What makes one build cost more than another

Scope, and scope is easier to talk about than it sounds. Three things account for most of the difference between a small build and a large one.

• How many kinds of call the agent has to handle. A build that books an appointment and nothing else is a small build. One that also reschedules, quotes, screens an urgent call and takes a message for somebody who is out is several builds sharing one phone line, and each kind of call has to be written, tested and then broken on purpose to see what it does.
• What the booking software allows. Where a platform offers a real two-way sync, the build reads and writes the book directly. Where it does not, the build works at the calendar level: availability is checked, the slot is booked on a calendar, the confirmed detail goes out by text, and a person puts it into the platform. Which of the two is possible is decided by the platform, not by preference, and it changes the work.
• How many places a captured call has to land. A name and a number arriving in one inbox is one path. The same call landing on a calendar, in a text to the owner, in a sheet the office already keeps and in the software the front desk lives in is four paths, and every one of them is somewhere the call can quietly stop.

None of that is a reason to wait before asking. Describe the calls the business is missing and say what it books in, and what comes back is one price and a plain answer on whether the build is worth doing at all.