Tamper-evident record
#10482 · Site message07:12
“Go ahead and move the wall back 600, drawings to follow”
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Each message is hashed and chained to the last, so the record can’t be quietly edited
For commercial managers and QS
Never lose a compensation event to a time‑bar.
OnNotice is the commercial intelligence layer between your site and your commercial team. Every early warning given and every compensation event or claim notified, before the clock runs out.
NEC4 · FIDIC 1999 · FIDIC 2017 · JCT
NoticesRiverside Depot · Phase 2
NEC4 ECCHard time-bars ≤ 21 days
2
Next deadline
14 Oct
- HARD TIME-BAR14 days ·14 OctLate access to Plot BFIDIC 2017 · 20.2.1 ·Project email
- HARD TIME-BAR19 days ·19 OctUnforeseen physical conditions at grid C4NEC4 · 60.1(12) → 61.3 ·Site diary
- HARD TIME-BAR38 days ·7 NovRetaining wall redesign instructed on siteNEC4 · 60.1(1) → 61.3 ·Site messages · Site team
Configured per project, against the contract you signed
- NEC4 ECC
- FIDIC 1999
- FIDIC 2017
- JCT D&B · SBC
The problem
Entitlements don’t go missing. They get buried.
An instruction arrives in a site group chat at 7am from someone who isn’t authorised to give it. Unexpected ground is noted in a site diary, but no early warning is raised. A delay is acknowledged in passing in the minutes.
None of it reaches the commercial team in time. By the time a quantity surveyor pieces it together, the notification window has closed, and where notice is a condition precedent the entitlement is time-barred.
The work was done. The money was earned. The notice was late.
→ OnNotice puts the client on notice
Site teams keep working the way they already do. OnNotice reads the chatter as it happens, flags the early warnings to give and the compensation events and claims to notify, cites the clause that governs it, and starts the clock from the right trigger date.
Commercial managers see what matters first: which notifications face a time-bar, how many days remain, and what to send.
What’s at stake
What a late notice really costs
Industry data, translated into what it means on your projects.
£1 in £3
of the contract value was in dispute on the average project HKA analysed (33.4% of the contract budget).
Why it matters
That money is won or lost through claims and compensation events: the events OnNotice picks up as they happen on site.
Source: HKA, CRUX Insight 8th Annual Report (Nov 2025), 2,200+ projects in 114 countries8 months
of extra time claimed on a 12-month programme, on average. Contractors sought extensions worth 65.8% of the planned schedule.
Why it matters
Every one of those days has to be notified in time. Miss the window and the extension can be lost, and the money with it.
Source: HKA, CRUX Insight 8th Annual Report (Nov 2025)#1
cause of construction disputes worldwide: claims that are poorly drafted, incomplete or not backed up by evidence.
Why it matters
Contractors rarely lose because they’re wrong. They lose because the claim is late, thin or unsupported. OnNotice cites the clause, starts the clock and keeps the original message as evidence.
Source: Arcadis, 2022 Global Construction Disputes Report£3
profit on every £100 of work at the UK’s top 100 contractors (average pre-tax margin of just over 3%).
Why it matters
So one lost £100k entitlement wipes out the profit on about £3.3m of work. There is no room to let one slip.
Source: The Construction Index, Top 100 Construction Companies 2026
Put together: when a project goes to dispute, a third of its value is on the table, much of the fight is over time that has to be notified, and margins leave no room to lose any of it.
Figures from the linked sources. The 8-month and £3.3m examples are our arithmetic from those figures.
Why it pays
Where the money is made, and where it’s lost
Spot it the day it happens
Compensation events, FIDIC claims and JCT relevant events are where the recoverable money on a project sits. OnNotice flags each one the day it surfaces in site communications, not weeks later at the valuation.
Never lose one to a time-bar
Notify late under NEC4 61.3 (8 weeks) or FIDIC 20.2.1 (28 days) and the entitlement is time-barred, however strong the case. OnNotice starts the clock from the right trigger date and counts down every one.
Protect the full value
Under NEC4, if you didn’t give an early warning you could have, the compensation event is assessed as if you had, and that can cost you part of its value. OnNotice prompts you to give the early warning to the Project Manager, then tracks the three‑week quotation clock.
How it works
From site chatter to a served notice
Three steps, one evidence trail. Every output links back to the message it came from.
- 1
Capture
Connect site messages, project email and meeting minutes once per project.
Every message lands in a hash-chained, tamper-evident ledger. Site teams change nothing about how they work.
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- 2
Detect
AI surfaces the entitlements hiding in the conversation.
Compensation events and variations, unforeseen physical conditions, Client- or Employer-caused delay, late information and instructions from people not authorised to give them, each with a clause citation and a confidence score.
NEC4 60.1(12) · confidence 87%
- 3
Notify
Every deadline is computed from the correct trigger date, from early warning to notification to quotation.
Conditions precedent are separated from procedural notice periods, so the notices that can cost you the entitlement always come first.
HARD TIME-BAR · 19 days remaining
Built to hold up in a dispute
Every flag is evidence. Every date is traceable.
Clause-cited opportunities
Compensation eventconf. 91%
Instruction to change the Scope given by site agent, not the Project Manager
NEC4 ECC 60.1(1) · notify under 61.3
trigger 12 Sep 2026 · 8 weeks
Governing clause identified under the project’s actual contract form
Not all notices are equal
Miss a time-bar and the money is gone
HARD TIME-BAR
Miss it and the entitlement is lost outright
Condition-precedent notices where late notice means no additional time or money. OnNotice ranks these first and counts down in days.
- NEC4 ECC 61.3
- 8 weeks
- FIDIC 2017 20.2.1
- 28 days
- FIDIC 2017 20.2.4
- 84 days
SOFT NOTICE
Late notice weakens the position, but doesn’t end it
Procedural notice periods that still matter for your records and your negotiating position. Tracked, prioritised below the time-bars.
- JCT DB 2016 2.24
- forthwith
- NEC4 ECC 15.1
- early warning
Security
Evidence you can stand behind
Site communications and contract documents are commercially sensitive. OnNotice treats them as the evidence they may one day become.
- Each customer’s data kept separate at the database level
- Tamper-evident record: every message fingerprinted and verifiable against the original
- Personal details removed before any AI processing, which runs with zero data retention and never trains AI models
- Advisory only: nothing is sent without a person deciding
- Consent recorded before site messages are captured
- Built with regional data residency support, encrypted in transit and at rest
Mid-size contractors
Put the client on notice before the clock runs out
Join the waitlist to hear when OnNotice opens up, or send us a message about your projects.