Truck Stock + Parts Inventory Management

Why this matters

The right truck stock is the difference between first-time fix + a callback. First-time fix is the most impactful operational metric in service business - it drives customer satisfaction, productivity, AND profitability. A truck without the right parts means the tech leaves to get parts, customer waits, second visit charged, customer frustrated. Truck-stocking science is the answer.

First-time fix rate (the KPI behind this)

First-time fix rate (FTFR) = jobs completed on initial visit / total jobs visited.

Benchmarks by trade:

• HVAC service: 65 - 85% target (industry varies)
• Plumbing: 70 - 90%
• Electrical: 75 - 90%
• Appliance repair: 60 - 80%
• Pool service: 80 - 90%
• Pest control: 90 - 98%

Below benchmark: truck-stock issue OR diagnostic issue. Investigate.

Above benchmark: well-stocked, well-trained team.

What determines truck stock

Service patterns: most-common parts needed for typical service calls. For HVAC:

• Filters (multiple sizes)
• Capacitors (varied microfarads)
• Contactors
• Fuses
• Refrigerant (R-410A + R-32 stocked)
• Hardware (screws, fittings, gaskets)
• Cleaning supplies

Job mix: residential service truck differs from commercial truck differs from install truck.

Geographic + seasonal: cold-climate truck has different stock from desert.

Building the stock list

Step 1: Pull 12-month service history

CRM exports all parts used. Sort by frequency. Top 80% of parts used = potential stock candidates.

Step 2: Calculate value vs space

Each part: cost + size + usage frequency.

• High-frequency + low-cost + small: definitely stock
• Medium-frequency + medium-cost + medium-size: stock
• Low-frequency + high-cost OR large-size: stock at shop, not truck
• Specialty / rare: order on-demand

Step 3: Define the truck-stock list

Typical residential service truck: 40 - 120 line items.

Step 4: Set par levels

Each item: min on truck + reorder point.

Example: filters, par 10 of common sizes; replenish when below 4.

Truck organization

Layout matters:

• Permanent bins with labels
• Color-coding by category (electrical = blue, plumbing = green, etc.)
• Heavy items low for safety
• Frequently-used items at hand-height
• Mirror layout on multiple trucks for consistency

Shadow boards / labeled outlines: missing item visually obvious.

Inventory app (some CRMs): tech scans QR codes on parts; system tracks counts.

Restocking process

Daily:

• End of day, tech notes what was used
• Quick visual check; flag anything below par

Weekly:

• Tech submits restock list
• Service manager OR parts coordinator reviews
• Order placed

Monthly:

• Full inventory count
• Compare to system records
• Investigate variances (theft? Damaged? Missing record?)

Inventory theft / shrinkage

Realities:

• Parts on trucks invite shrinkage
• Tech might "borrow" for personal use
• Damaged items may be tossed without recording
• Lost items may not be reported

Loss prevention:

• Random truck inventory audits
• Parts tracked per job (CRM allocation)
• Variance reports flagged
• Trust-but-verify culture

Acceptable shrinkage: 1 - 3% of parts inventory annually. Higher = problem.

High-value parts management

Some parts are expensive:

• Refrigerant
• Compressor
• Control board

For these:

• Locked compartment in truck
• Tech accountable per piece
• High-value items stocked sparingly OR shop-only

Stocking by service line

Service truck (residential service + repair):

• Variety stock for diagnostics + repairs
• 40 - 120 line items typical
• Aim for 70 - 80% first-time fix on common services

Install truck (new equipment install):

• Materials specific to the install job + extras for variations
• Specific to scheduled job + buffer
• Restocked job-to-job

Maintenance truck (recurring service):

• Lighter stock (mostly filters + small parts)
• Predictable; can be lean

Specialty truck (sewer scope, hydrojet, leak detection):

• Equipment-specific + standard repair parts as backup

On-truck stock budget

A typical residential service truck carries:

This stock represents capital outlay; manage like an asset.

Replenishment supplier strategy

Primary supplier: handles 60 - 80% of orders

• Best pricing + reliable delivery
• Often offers payment terms (Net 30)
• Examples: Ferguson (plumbing), Source (HVAC), Hahn (electrical)

Secondary: backup + specialty

Third / fourth: rare specialty OR commodity

Build relationships with primary; quote shop for special projects.

Inventory management systems

Spreadsheet (small ops; 1 - 3 trucks):

• Manual tracking; OK but error-prone
• Time-intensive

CRM with inventory module (ServiceTitan, Manuall, Housecall Pro):

• Auto-allocates parts to jobs
• Tracks levels
• Reorder alerts
• Most contractors 5+ trucks

Standalone inventory app (Sortly, Stockify):

• Specialized for inventory
• Separate from job management
• Less common in service business

Most established service businesses use CRM-integrated inventory.

Standardization across trucks

For multi-truck operations:

• Same layout
• Same labeling
• Same par levels per item
• Tech moving truck-to-truck doesn't waste time finding parts

Standardization reduces:

• Lost parts
• Incorrect stocking decisions
• Tech confusion

Common stocking mistakes

Stocking what tech "thinks" might be useful

• Reality: 80% of jobs need 20% of possible parts
• Stock the 20%; rare parts on-demand

No par levels

• Tech "thinks they have enough"
• Customer waits while tech goes for parts
• Set par levels + enforce

Bulk-buying low-use items

• Item sits for years
• Eventually obsolete OR expired (refrigerant restrictions, etc.)
• Buy only what you'll use in 12 months

No truck audits

• Inventory drifts
• Stock gaps invisible
• Monthly audit catches problems

Tech-specific layouts

• Each tech sets up their own truck differently
• New techs lost on different trucks
• Standardize across fleet

ROI of well-stocked trucks

A truck with 70% first-time fix vs 50%:

• 8 jobs/day vs 6.5 jobs/day (assuming average 1.5 callback rate on poor stock)

Stock investment + management cost: ~ to maintain proper levels.

Net ROI on truck stock discipline: significant.

References

• ServiceTitan inventory module documentation
• HVAC + Plumbing supplier programs (Ferguson, Source, Hahn)
• Industry first-time-fix benchmarks (PHCC, ACCA)
• Manuall internal: Weekly Truck Inventory Audit, Dispatch Board Management + Optimization