Ask any experienced site manager about their morning routine and at some point the phone call comes up. Before leaving home, sometimes. On the drive in. First thing when they get on site. Supplier calls about materials, delivery windows, availability questions. It is so deeply embedded in the job that most site managers do not think of it as a separate activity. It is just part of what you do.
We started tracking how much time procurement-related phone activity actually consumes in a typical week, working with contractors in our early access programme to log it explicitly rather than estimate it. The results were not surprising if you have spent time managing sites. They are worth setting out clearly because the total is rarely acknowledged as what it actually is: a significant portion of a skilled person's working week spent on low-level information gathering.
What We Tracked and How
Over a four-week period, we asked a group of site managers and directors running active projects to log their procurement-related phone time. The scope was straightforward: any call or call attempt where the primary purpose was sourcing, price checking, ordering, confirming, or chasing materials. This included calls that did not connect, calls that required a callback, and calls made while waiting for suppliers to check stock or find an answer.
We also asked them to log the time lost to context-switching: the moments after a call when they were back in a site conversation or a technical task and had to re-establish where they were. This is harder to quantify but consistently showed up in feedback as meaningful.
Across participants running projects of varying size, procurement phone activity accounted for between one and a half and three hours of direct call time per working day for those who owned materials sourcing for their projects. The middle of that range, around two hours, was the most commonly reported figure for site managers running a single active project with regular material needs.
Where the Time Actually Goes
Breaking down the activity, the largest single category was not initial order placement but chasing: calls made to confirm that a delivery was still coming, to find out why materials had not arrived, or to follow up on a quote that had not come back. Across participants, chasing calls accounted for roughly half of all procurement phone time.
The second category was price checking: calling two or three suppliers to find the best current price on a given item before placing an order. This is the category that feels most justified because it produces direct commercial value. But it is also the most interruptive because it requires reaching multiple people, waiting for them to check, and then reconciling responses that arrive at different times.
The third category was order placement itself: the actual call to say, here is what I need, please deliver on Thursday. This is a small fraction of the total. The bulk of the time is in the surrounding activity.
What This Costs in Practice
The financial arithmetic is straightforward in outline. A site manager at this scale typically commands a day rate that, when expressed as an hourly figure, puts the cost of two hours of phone time at a meaningful number. On a project running for twelve weeks, that adds up to a considerable allocation of skilled management time spent on information gathering that could, in principle, be handled differently.
The more significant cost, and the harder one to quantify, is the opportunity cost. What does a site manager do with two hours of uninterrupted time when procurement is not consuming it? Site walks. Trade coordination. Quality checking. Programme management. The activities that actually require their experience and judgment. The activities where their expertise produces value that cannot be replicated by a more efficient process.
One participant described it clearly: when he was doing procurement by phone all morning, he was effectively doing two jobs simultaneously, neither of them well. The trades on site knew not to bother him before 10am because he was always on the phone. By the time he could properly focus on the work in front of him, half the morning was gone.
The Interruption Cost Beyond the Call
The context-switching problem is real and consistently underestimated. Research on knowledge work has long established that the cost of an interruption extends well beyond the duration of the interruption itself. On a construction site the context is physical rather than cognitive, but the principle holds. A five-minute supplier call in the middle of a technical conversation with a plumber or a structural question with the engineer does not cost five minutes. It costs the five minutes plus the time to re-establish the conversation and whatever is lost in the transition.
When site managers log their procurement activity in aggregate, the pattern that usually emerges is not one or two extended calls but a continuous low-level interruption throughout the day. Calls come in response to deliveries, queries from the merchant, callbacks from suppliers who were not available earlier. The work of managing materials is woven through the entire working day rather than contained in a defined block.
What Makes Phone Procurement Persistent
Understanding why this pattern persists is useful if you want to change it. There are three genuine reasons that phone calls remain the dominant channel for procurement at this scale, and only one of them is inertia.
The first is trust. Merchants where site managers have long-standing relationships deliver on verbal commitments in ways that formal ordering channels sometimes do not. When you call someone you know and they tell you the materials will be there Thursday morning, you believe them. That trust is real and has practical value.
The second is flexibility. Urgent requests, split deliveries, and last-minute changes to specifications or quantities are handled more easily by phone than by any formal ordering process. A good merchant relationship is partly the ability to call at 4pm and sort something out for the following morning.
The third reason, and this is the inertia part, is that no sufficiently frictionless alternative has been widely adopted. Email ordering exists but requires formatting and follow-up. Online portals exist but are often designed for commercial procurement managers, not site managers who need to move fast on a mobile in a noisy environment.
The Boundary Between Relationship and Routine
We are not arguing that phone calls with suppliers should be eliminated. The relationship value in the first two reasons above is genuine. The question is whether all of the procurement activity that currently happens by phone genuinely requires phone. Chasing a delivery that should have been confirmed automatically does not. Price checking on routine items that could be covered by pre-agreed trade pricing does not. Placing a repeat order for a standard item that has been ordered in the same form three times before does not.
The call that benefits most from a human relationship is the exception: the urgent last-minute request, the substitution query, the commercial negotiation on volume. Those calls benefit from the trust and flexibility that a relationship provides. The routine information gathering that takes up the bulk of procurement phone time does not require it. Separating the two is the practical shift that makes the time available for the work that actually needs a site manager's attention.
