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Bob, Quantsurv's AI agent

Bob · Underpayments

Recover short and late payments under the Construction Act

For subcontractors and main contractors whose application for payment was paid short, paid late or ignored. Bob checks the payment and pay less notices, works out the sum due and when it was due, and chases it in the right order.

  • Set and forget
  • A QS in the loop

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On a phone: An underpayments case on a phone: Bob's questions and your answers, ending with £28,250.00 owed to you by Example Build Ltd since 23 September 2026 and a link to your next step. On larger screens: What Bob found in the documents for an underpayments case: the payment terms, no payment notice, a pay less notice of £20,000.00 and £20,000.00 paid so far, each with a link to the page it came from, a Companies House check, then Bob asking whether that is all right.
The case panel for an underpayment: £28,250.00 owed, which Example Build Ltd should have paid by 23 September 2026, and the next step, a reminder.
An underpayments case on a phone: Bob's questions and your answers, ending with £28,250.00 owed to you by Example Build Ltd since 23 September 2026 and a link to your next step.
Example data

Use Bob when

  • You were paid less than you applied for and no valid pay less notice arrived.
  • Your application was ignored: no payment notice and no payment.
  • A pay less notice came late, or does not explain how the sum was worked out.
  • Payment is overdue and you want it chased properly without spoiling the job.

What Bob works out

  • The notified sum: what is legally due, from your application and any notices.

  • The due date and the final date for payment, from your contract or the Scheme.

  • Whether a payment notice or pay less notice was valid and on time.

  • Whether you need to give your own default notice, and the new final date it sets.

  • What has been paid, and what is still owed.

  • The next step and when it can go.

Days are counted under section 116 of the Construction Act, which leaves out Christmas Day, Good Friday and bank holidays in England and Wales.

The letters Bob sends, in order

  1. Default notice

    Only where your contract needs one. It sets a new final date for payment.

    Construction Act, section 110B

  2. Reminder

    A polite reminder with 7 days to pay.

  3. Formal demand

    A formal demand for the sum due, with 7 days to pay, saying plainly what may follow.

  4. Notice of intention to suspend

    Gives at least 7 days' notice that you may suspend work. Bob asks you first.

    Section 112

  5. Adjudication

    Bob asks you first, then hands the case to Quantsurv.

    Section 108

Bob offers each next step the day after the time to pay runs out. You choose which letters go by themselves and which Bob asks you about first.

The case panel for an underpayment: £28,250.00 owed since 23 September 2026, the next step, a reminder, the checks before Bob chases it, and which letters send by themselves and which ask you first.

What Bob needs from you

  • Your application for payment
  • The payment terms in your contract, or tell Bob you are not sure
  • Any payment notice or pay less notice you received
  • What has been paid so far

When Bob hands the case to a Quantsurv QS

Bob stops chasing and hands the case to a Quantsurv QS when they dispute the work or raise a counter-charge, when they may be insolvent, when the payment terms are unclear, or when anything does not add up.

Updates your way

Bob emails you as each step happens. Text message and WhatsApp updates are coming later. Or switch updates off and check your dashboard.

  • Bob, Quantsurv's AI agentEmailOverdue to you

    Bob sent Example Build Ltd a reminder. They have until 7 November to pay you.

  • Bob, Quantsurv's AI agentTextComing laterOverdue to you

    Bob sent Example Build Ltd a reminder. They have until 7 November to pay you.

  • Bob, Quantsurv's AI agentWhatsAppComing laterPaid to you

    Example Build Ltd has paid you £28,250.00. Bob has closed the case.

Questions

What is a notified sum?

The sum stated in a valid payment notice or, if none was given, in your application or default notice. It must be paid by the final date unless a valid pay less notice reduces it.

What if my contract has a pay when paid clause?

Pay when paid is not allowed in most construction contracts. Bob asks you about it, flags it and hands it to a Quantsurv QS to check.

Can Bob help with homeowner jobs?

Work on a homeowner's own home is outside these payment rules, so Bob offers to move the case to invoice chasing.

Can I suspend work?

Section 112 lets you suspend after 7 days' notice if the notified sum is not paid by the final date. Bob prepares the notice and asks you first: it only goes with your go-ahead.

Taking the pain out of payments.

Join the launch list and we will email you once when Bob launches.

Launching soon. We will email you once when it opens.

We use your address only to tell you when Bob launches. We send a confirmation email first, and you can leave the list at any time. See our privacy notice.