Why Trades Businesses Lose Money Between Jobs (and What to Fix First)

Picture a Tuesday in May. Your crew is booked solid: a commercial boiler inspection at 8am, a residential AC installation at 11, and three afternoon service calls. By 9am the day has already started going sideways. The 8am job runs over because the tech drives the long way around roadworks nobody flagged in the schedule. The office phone rings twice while your admin is dealing with a supplier query, and both calls go to voicemail. One caller never tries again. At the AC installation, the team finds there's no capacitor on the van, one of the most common parts in the trade. They drive back to base, pick one up, and lose 90 minutes. Meanwhile the afternoon calls aren't in any digital system. They're written on a notepad on the dispatcher's desk.

By the end of the day the crew has completed four jobs instead of seven, and two of those need a return visit to fix something small. Nobody sees a pattern, because in a trades business a day like that just feels like a tough one.

It wasn't a tough day. Every hour that went missing went missing in the gaps around the jobs, and lean manufacturing has a name for each kind of operational waste hiding in those gaps. The framework is called TIMWOODS: Transportation, Inventory, Motion, Waiting, Overproduction, Overprocessing, Defects and Skills. It was built for factory floors, but it fits any business where skilled people drive to customers, fix things and bill for their time, and plumbing, electrical and HVAC firms fit it better than most.

The trades have been slow to borrow the idea. McKinsey's research on construction sector productivity found that from 2000 to 2022 the global construction industry improved labour productivity by just 0.4 percent a year, while manufacturing managed 3 percent. Compounded over two decades, that is a lot of margin nobody went looking for.

Eight Places a Trades Business Loses Money

Transportation: the billable hours stuck in traffic

The cost that matters here is the time between jobs, and what that time would have earned on a job.

According to the American Transportation Research Institute, congestion on US highways cost trucking $108.8 billion in 2022, the equivalent of more than 430,000 drivers sitting idle for a year. A service van isn't a long-haul truck, but it shares the same roads. A plumber running three residential calls in different parts of town on an unplanned route loses whole jobs to peak-hour traffic: a 45-minute delay between calls can turn a six-job day into a four-job day. Across a busy season, that adds up to hundreds of lost billing hours per van.

You don't need route-optimisation software to start fixing this. Grouping jobs by area and moving start times away from peak congestion recover a surprising amount of capacity. Most small trades businesses never try, for a dull reason: nobody tracks the time between jobs, so it never shows up on the P&L.

Inventory: the parts that are never there when you need them

Every HVAC technician has a version of this story. You arrive at a residential call, diagnose a failed capacitor, and there isn't one on the van. You drive back to base. An hour and a half is gone, the customer is annoyed, and the next job is running late before it has started.

Van stock is one of the most persistent problems in field service. A 2026 ServiceTitan survey of more than 1,000 commercial contractors found that 37 percent of them manage scope creep specifically to avoid unplanned costs. The survey doesn't break those costs down, but in a service business my bet is that parts surprises and unplanned return trips make up a big share.

The opposite failure is hoarding: vans loaded with slow-moving stock that ties up cash while the parts today's jobs need sit in the warehouse. Buying more parts fixes neither problem. What fixes both is knowing which parts belong on which van, based on the jobs that van actually runs.

Motion: the steps that shouldn't be there

On a factory floor, motion waste is a worker walking further than necessary to reach a tool. In a trades business it's a technician cross-referencing three apps, a paper job sheet and a call to the office to work out what they're supposed to do when they arrive.

HVAC has a sharp example. Older building management systems often label data points with codes like "Z_T2" instead of "Room 101 temperature sensor", so a technician diagnosing a fault spends the first stretch of the visit decoding labels before any real diagnosis starts.

In a plumbing business, motion waste looks like service history split between a folder on one person's laptop, a WhatsApp thread, and the memory of whoever did the last visit. For an electrician it's the first 20 minutes of each job spent working out what the last person did and why. None of that time is billable, and almost nobody measures it.

Waiting: the revenue that goes to voicemail

The first kind of waiting happens on site. A technician arrives on time and sits in the van for 25 minutes because the homeowner is running late, or can't carry on because the person at the office who has to make a call isn't picking up. Some of these gaps really are unavoidable. Many come from loose scheduling, no agreed way to reach a decision-maker, and no job record the technician can check without phoning someone.

I've seen the other side of this as a customer. Of four technicians booked to come to my home in Armenia for plumbing, gas boiler and internet jobs, three arrived late for a time slot they had chosen themselves. The booking took a full day rather than a window, and I learned to write off the day whenever I booked anyone.

The business pays for this too, just less visibly. Each appointment that runs an hour late pushes the next one back, and a day scheduled for four jobs ends with two, because nobody managed the gaps between them.

The second kind of waiting is the unanswered phone. Jane Blanchard, head of brand and marketing at ServiceForge, said it plainly on a Plumbing & Mechanical podcast on the cost of missed calls: "Every missed call is a missed job." Fewer customers leave voicemails now. Someone who has searched for a contractor and dialled expects a person to answer, and if nobody does, they call the next listing.

Using industry averages, Blanchard calculated that missing just two calls a day can mean roughly $8,000 in lost monthly revenue, or about $90,000 a year, once booking rates and average job values are factored in. After-hours and weekend calls tend to be the most urgent and the most profitable. A burst pipe at 9pm is an emergency callout at emergency rates, and it goes to whoever picks up. Of the eight gaps in this article, this is the one I would fix first.

Overproduction: busy doing the wrong work

Overproduction doesn't mean working too hard. It means filling the schedule with the wrong work, which in the trades usually means high-volume, low-margin reactive calls while the better-paid preventative and maintenance work never gets sold.

A plumbing company that books ten drain calls in a day and never offers a maintenance agreement is overproducing. A Plumbing & Mechanical piece on the end of reactive service argues that the break/fix model is no longer sustainable: reactive work is labour-intensive by definition, and as David Benaiges of Watts puts it, "with limited labor, contractors simply cannot afford to be constantly reacting." The piece describes the way out as a shift "from revenue driven by failure to revenue driven by prevention."

Some firms say so out loud. Ask a purely reactive business about preventative maintenance and the answer amounts to "call us when something actually breaks, then we'll come." The technician loses interest the moment a routine inspection comes up. Preventative work isn't priced for, isn't offered and isn't wanted. I don't think that's an accident. Somebody chose it, short-sightedly, and the choice leaves the best-paid work on the table every day.

According to the ServiceTitan Commercial Specialty Contractor Industry Report 2026, improving execution efficiency is now the third-highest business goal among commercial contractors, with 41 percent prioritising it, ahead of cash flow management and building client relationships. The same report puts it bluntly: "success is no longer defined by who wins the most bids, but by who manages risk and operations with the most precision."

Overprocessing: doing the same thing twice

A technician finishes a job and writes a paper service report. They photograph it and text it to the office, where an admin retypes it into the invoicing system. Three hours later an invoice goes out with an error in the job description.

One job, three separate processes, and every handoff between them is another chance to lose or garble something.

In trades businesses, overprocessing usually shows up as paper job sheets duplicating what should live in a digital system, customer signatures collected on paper and then keyed in by hand, handwritten timesheets that someone else summarises for payroll, and job notes that exist only in text messages. Think of it as painting a wall twice because nobody agreed on the colour.

Only 20 percent of the contractors in the ServiceTitan report run their business on a single platform, and the report's industry adviser calls consolidating that fragmented technology "the most critical strategic opportunity for 2026 success." Asked how they protect profitability when costs rise, 57 percent gave the same answer: ensuring timely billing. That turns overprocessing in the job-to-invoice flow from an admin annoyance into a cash flow problem.

Defects: the true cost of going back

A callback costs a full non-billable trip, plus a dent in the customer's trust.

When a junior HVAC technician charges a refrigerant line incorrectly, the business pays for two visits: the first, which was billed, and the correction, which isn't. The senior technician sent to fix it is now unavailable for a paying job elsewhere, so the business loses once on direct cost and again on the job it couldn't take.

Deloitte's research on field service operations found that high-maturity field service teams are 8.5 times as likely to operate as a profit centre as low-maturity ones, and it describes the industry's direction of travel as a move from reactive fixes to preventive service. No other figure in this article comes close, and it's the one I'd put in front of any owner who thinks callbacks are just part of the job.

The skills shortage makes defects worse. According to ACHR News, citing National Comfort Institute president Rob Falke, the industry was already short 110,000 technicians, with projections of 225,000 unfilled positions by 2027, or 1.8 open roles for every qualified technician. Under that pressure, firms hire less experienced people faster than they can train them, and the rest follows: more callbacks, more senior time spent on rework, less capacity for new work.

Skills: the right people doing the wrong things

The last category is usually the most personal, because it often starts with the owner.

Skills waste is capable people used below their ability, week after week. In a trades business that's the master plumber answering invoice queries every Friday afternoon, or the experienced HVAC engineer who ends up handling every supplier dispute, complaint and scheduling clash because no system lets anyone else. Often it's the owner, signing off decisions the team should be able to make alone, which is usually a handoff problem more than a people problem.

The WEF Future of Jobs Report 2025 names skills gaps and workforce transitions among the biggest operational challenges across industries, and the trades are no exception. According to ACHR News, about 23,000 HVAC technicians leave the workforce every year through retirement, burnout or career changes, and not enough trained people are coming in to replace them. With a shortage like that, putting your most skilled people on the wrong tasks makes it feel worse than it is.

In markets where good technicians are scarce, the best ones tend to be found by word of mouth rather than through any platform or directory. A reliable plumber's number gets passed between neighbours because the formal market hasn't solved the problem of telling good from bad. Firms that keep their skilled people and build a name become part of that informal referral network. Firms that churn through staff and generate callbacks never get into it, and they never see the work they lose that way.

Six Questions About Last Month

You don't need clean data for these. A rough sense of last month is enough, and each question points at one of the categories above.

1. How many calls did you miss last week, and how many became jobs? If you don't know, that's the Waiting problem answering for itself. Track unanswered calls for one week, note how many callers rang back and booked, and put a dollar figure on the ones who didn't. The number tends to get attention.

2. How often did a technician make a second trip because a part wasn't on the van? Count the trips, multiply by average drive time and your hourly rate, and you have your monthly Inventory cost in actual money. Most owners guess low.

3. How does a technician find out what happened on the last visit to a property? "They ask someone" or "there's a folder somewhere" means every repeat job starts from scratch. That's Motion.

4. How many callbacks did you do last month that nobody paid for? Put the senior-technician hours next to that number. Of the six, this one maps to Defects.

5. When did your team last finish a job and offer the customer a maintenance agreement? If the honest answer is "rarely", you're overproducing. A reactive-only model isn't a strategy. It's an accidental decision to leave the most profitable work to competitors who do offer it.

6. What happens when one of your senior technicians is off for a week? If things fall apart, the knowledge lives in one or two heads. That's Skills waste, and it only becomes visible the week those people aren't there.

Where to Start

One service call to my own home shows how these categories stack. The main water valve needed unscrewing, a straightforward job. On the agreed day two specialists arrived, inspected the pipe, conferred, and left: they didn't have the tools. The operator booked a second appointment. A different team came, did the job in five minutes, and before leaving fixed a small problem with the toilet tank I hadn't even mentioned. They were in my home for under ten minutes. The first visit cost me a full day and the business two specialists' time with nothing billable to show for it: an unnecessary trip (Transportation), tools that should have been on the vehicle (Inventory), and a job that had to be done twice (Defects). None of it appeared on an invoice. From the outside, it looked like a hard industry with unpredictable jobs.

For most trades businesses, I'd still start with the unanswered phone rather than the van or the schedule. The loss is concrete (around $90,000 a year on ServiceForge's numbers), the fix is the least disruptive on this list, and you'll see the difference within weeks. I don't have a clean answer for the one-van operator who is technician and dispatcher at once, whose phone rings while both hands are under a sink; that business needs a different fix. Once the phone is handled, what's left usually looks like the broader pattern of being busy without getting ahead.

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