I appreciate you reaching out, but I need to be straight with you--I'm US-based (Indianapolis area) and my background is in excavation, electrical, and mechanical systems, not UK Facilities Management. That said, I've dealt with the exact same time verification nightmare across our multi-site construction projects, and the underlying issues are universal. Here's what kills accurate hour tracking in our world: when you've got crews spread across 15+ active sites doing utility work, demolition, and grading, you're relying on foremen's handwritten logs and "best estimates." We hit 98% on-time completion rates only after implementing GPS-tracked equipment with integrated time logging--but even that doesn't capture the full crew picture when someone's hand-trenching in a residential easement two miles from the nearest machine. The commercial risk is massive. I've seen subcontractors pad hours by 12-15% on municipal projects because there's no real-time verification, and by the time you audit the invoices against actual output, you're either eating the cost or damaging the client relationship. One stormwater project in 2022 cost us $18K in disputed labor charges because we couldn't definitively prove who was on-site during a three-day stretch when weather delayed work. Manual spot checks are theater. When I was doing field supervision early in my career, I could "verify" maybe 20% of actual hours across our sites on any given week. The math doesn't work when your workforce is mobile and your projects overlap--you need automated capture at the point of work, or you're just guessing with expensive consequences.
I'm US-based in the Chicago restoration industry, not UK FM, but I've managed the exact same time verification problem across emergency restoration crews operating 24/7 at multiple sites simultaneously--and the core issue translates directly. The reason it's nearly impossible to verify hours accurately: your workforce is reacting to emergencies across unpredictable locations. When we get a 2am water damage call and dispatch a crew to a commercial property in Wisconsin while another team is mid-mitigation in downtown Chicago, there's no practical way for me to physically verify who arrived when or how long containment setup actually took. We've had situations where insurance adjusters questioned a 14-hour mitigation claim because our project manager's initial estimate was 8-10 hours--but black mold remediation expanded scope mid-job, and we had no timestamped proof beyond the crew lead's word and equipment rental logs. The commercial risk is you either overbill and damage client trust, or you underbill and kill your margin because you can't defend actual labor. I've seen restoration competitors lose entire property management contracts because they couldn't substantiate overtime charges during a storm surge response--the client just assumed padding. In our industry, where we often work on deferred payment through insurance, one disputed invoice can freeze cash flow for 60+ days while adjusters investigate. Manual spot checks are worthless when your teams are inside flooded basements or sealed mold containment zones for 6-8 hour stretches. I can't reasonably ask project managers to drive between four active jobs to verify presence--they're already coordinating with adjusters, ordering materials, and managing client communication. By the time someone physically checks, the crew's moved to equipment breakdown or lunch, and you're back to trusting self-reported timesheets.
Look, if you're managing a multi-site FM contract and you can't verify working hours, you've got a much bigger problem than just a payroll headache. It's a massive commercial risk. It's the kind of thing that quietly eats away at client trust and kills your margins. When you can't actually prove the hours your team put in, you're basically just operating on guesswork. That's a nightmare scenario when you're sitting across the table during an audit or trying to negotiate a renewal. The old-school approach of manual spot checks just doesn't cut it anymore. They don't scale. You're only ever seeing a tiny snapshot of what's happening on the ground, which means the vast majority of your operational activity--and all the liability that comes with it--is just sitting there unverified.
In any property-related operation, whether it's facilities management or renovation work, unverified hours usually come down to trust without tools. When teams are spread across multiple sites, manual logs and spot checks simply don't hold up--they rely too much on human memory and goodwill. I've seen projects where unclear hours led to billing disputes and strained client trust, and once that confidence is gone, it's tough to rebuild. Accountability systems need to be as mobile and real-time as the people doing the work.
Unverified working hours persist in contracted, multi-site environments because it's genuinely hard to evidence time when teams are mobile, schedules change daily, and work happens outside a single controlled location. I've seen this firsthand managing drivers and crews moving between job sites, where paper logs and self-reported times quickly drift from reality once jobs run long, sites aren't ready, or travel gets complicated. Even with good intentions, supervisors can't physically validate every start, stop, and delay across dozens of locations, so small gaps quietly become standard practice. The risk of weak time verification is that those gaps turn into real money and strained client relationships. I've watched disputes arise when invoices didn't align with what a customer believed happened on site, and without solid evidence, the operator carries the loss or the blame. Manual controls and spot checks don't scale because they rely on exceptions rather than visibility; they catch problems after the fact instead of preventing them. In modern FM-style operations, the issue isn't trust in people—it's that outdated processes can't keep up with how fragmented and fast-moving the work has become.
When work is done across multiple locations with no single location to get the true number of hours worked, the hours will remain unverified. And when there is no centralized way to report these hours, the process is typically seen as a formality rather than a documented fact. The problem here is not that you will be charged for hours not worked; it is that when you cannot prove to your customer how services were delivered, the relationship begins to break down.
In most cases, manual time sheets fall apart as employees go from site to site. It is hard to conduct spot checks, and the manager has to take the employee's information on good faith. This is a commercial risk when you have a contract that could be audited or disputed by your customer.
The gap between scheduled hours and verified hours will always increase over time in any mobile workforce. Any system that relies on an employee's administrative efforts and trust will create operational blind spots that management does not even know exist until they have a compliance issue or a billing dispute.
From a commercial perspective, unverified hours create uncertainty in contracts. If the time spent working cannot be audited, then forecasting and accountability will be affected. Uncertainty will erode customer confidence and complicate long-term agreements.