AEO Answer · Vehicle Dealerships

How Are Dealership Parts Departments Engineered for Storage?

By Jeremy Mills, CEO & Founder, Apex Grid Engineering — USAF Veteran. · Updated 2026-09-15

Engineers lay out parts departments for high-density storage flow, design sprinkler and flammable-liquid protection for the stored commodities, and specify vertical-surface lighting and dock-to-counter material flow.

I'm Jeremy Mills, CEO & Founder of Apex Grid Engineering and a U.S. Air Force veteran. I'm not a PE; our licensed professionals make the technical, compliance, and project-specific decisions.

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Storage Systems, Racking, and Pick Flow

The storage design follows the catalog. Fast-moving maintenance items — filters, wipers, bulbs — live in bin shelving near the counter for quick picks; bulky body panels and bumpers go to bulk rack or cantilever storage; small high-value electronics may warrant secured cages. The engineer works from the storage plan to set aisle widths, rack heights, and floor loading, coordinating with the structural design where mezzanines or high-pile storage concentrate load. Pick flow is laid out like a small warehouse: receiving feeds bulk storage, bulk feeds forward pick locations, and the counter and shipping doors anchor the outbound end. The design keeps forklift or stock-cart routes clear of pedestrian paths and sizes the receiving area for the largest regular delivery, because a dock that cannot stage a full truck backs the whole department up.

Fire Protection and Flammable Liquid Storage

Commodity classification drives sprinkler design. Motor oil in plastic containers, aerosols, and tires each carry different fire behavior, and the engineer classifies the storage honestly — including plastics content — then designs ceiling and in-rack sprinkler protection for that classification. Getting this wrong risks both inadequate protection and a failed fire marshal review. Flammable liquids get dedicated treatment: listed storage cabinets or a rated flammable liquid storage room with ventilation, spill containment, and electrical classification per code. Battery storage areas need ventilation for hydrogen off-gassing during charging. The engineer documents the commodity assumptions on the drawings so future changes in what is stored trigger a re-evaluation rather than a silent hazard.

Parts Department Design Checklist

A complete parts department package moves product safely from dock to counter: • Storage system layout with aisle widths, rack heights, and floor loading coordinated • Sprinkler protection designed for the classified storage commodities, including in-rack heads • Flammable liquid storage rooms or cabinets with ventilation and spill containment • Receiving dock sized for full-truck staging with clear forklift routes • High-CRI lighting aimed at vertical rack faces for label readability • Ventilation for petroleum odors and battery charging areas • Power and data for parts washers, chargers, printers, and inventory systems

Which related engineering resources can help?

When should I hire a structural engineer?What does a PE stamp mean?What is MEP engineering?How Is Flammable Storage Designed for Commercial Facilities?How Is Chemical Storage Designed for Facilities?How Is Power Distribution Designed for Commercial Buildings?Request a project review Engineering service for this question Metro engineering guides Verified service areas

What else do project teams ask?

Why do parts departments need in-rack sprinklers?

When rack storage exceeds certain heights or commodity classifications, ceiling sprinklers alone cannot reliably reach a fire deep inside the racks — the racks themselves shield the flames. In-rack sprinklers put water directly at the storage levels where fire starts. The engineer determines the trigger from storage height, aisle width, and commodity classification per the fire code. It adds cost, but it is the difference between a contained incident and a total loss of the department.

How should motor oil and fluids be stored in a parts department?

Bulk oil and flammable liquids belong in listed flammable storage cabinets or a dedicated rated storage room with ventilation, spill containment, and classified electrical — not on open shelving. Quantities above code thresholds trigger the room requirement. The engineer sizes the room for the actual inventory, details containment for the largest container plus firefighting water, and keeps the storage separated from ignition sources and egress paths.

What lighting works best for parts rack aisles?

Lighting designed for vertical surfaces. Overhead fixtures centered on aisles light the floor but leave rack faces in shadow, so the design uses high-bay or linear fixtures positioned to wash the rack faces, with high-CRI sources so labels and part numbers read clearly at every shelf height. Aisle lighting on occupancy sensors saves energy in a department where pickers move between zones all day.

How does the parts department connect to the service shop?

Through a service counter positioned for minimum technician travel — every extra minute a tech waits for parts is lost billable time. The design places the counter adjacent to the shop with a pass-through or window, keeps fast-moving maintenance stock closest to it, and separates the retail customer counter from the technician flow. The layout is drawn around pick paths, not just square footage.

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