8  Warehouse functionality

The wise adapt themselves to circumstances, as water molds itself to the pitcher. —Chinese Proverb

Learning objectives

  • explain 5 functions that distribution facilities perform; and
  • distinguish warehouse types by their role, flow, ownership, product, and size.

Supply-chain network

flowchart LR
 subgraph T0["Raw Material<br>Supplier"]
    direction TB
        S1["S1"]
        S2["S2"]
        S3["S3"]
  end
 subgraph T1["Manufacturing<br>Plant"]
    direction TB
        P1["P1"]
        P2["P2"]
        P3["P3"]
  end
 subgraph T2["Manufacturing<br>Warehouse"]
    direction TB
        MW1["MW 1"]
        MW2["MW 2"]
        MW3["MW 3"]
        MW4["MW 4"]
  end
 subgraph T3["Wholesaler<br>Warehouse<br>"]
    direction TB
        WW1["WW 1"]
        WW2["WW 2"]
        WW3["WW 3"]
  end
 subgraph T4["Retailer<br>Warehouse"]
    direction TB
        RW1["RW 1"]
        RW2["RW 2"]
        RW3["RW 3"]
        RW4["RW 4"]
  end
 subgraph T5["Retail Store"]
    direction TB
        RS1(("A"))
        RS2(("B"))
        RS3(("C"))
        RS4(("D"))
  end
    S1 --> P1 & P2 & P3
    S2 --> P1 & P2 & P3
    S3 --> P1 & P3
    P1 --> MW1 & MW2
    P2 --> MW2 & MW3
    P3 --> MW3 & MW4
    MW1 --> WW1
    MW2 --> WW1 & WW2
    MW3 --> WW2 & WW3
    MW4 --> WW3
    WW1 --> RW1 & RW2 & RW4
    WW2 --> RW2 & RW3 & RW4
    WW3 --> RW1 & RW3 & RW4
    RW1 --> RS1 & RS2
    RW2 --> RS2 & RS3
    RW3 --> RS1 & RS4
    RW4 --> RS3 & RS4
    ```@{ label: "```" }
    S1@{ shape: rect}
     S1:::supplier
     S2:::supplier
     S3:::supplier
     P1:::plant
     P2:::plant
     P3:::plant
     MW1:::mwh
     MW2:::mwh
     MW3:::mwh
     MW4:::mwh
     WW1:::wwh
     WW2:::wwh
     WW3:::wwh
     RW1:::rwh
     RW2:::rwh
     RW3:::rwh
     RW4:::rwh
     RS1:::store
     RS2:::store
     RS3:::store
     RS4:::store
    classDef supplier fill:#eff6ff,stroke:#1d4ed8,stroke-width:1px
    classDef plant    fill:#e0f2fe,stroke:#0ea5e9,stroke-width:1px
    classDef mwh      fill:#dcfce7,stroke:#10b981,stroke-width:1px
    classDef wwh      fill:#fef3c7,stroke:#f59e0b,stroke-width:1px
    classDef rwh      fill:#fde68a,stroke:#d97706,stroke-width:1px
    classDef store    fill:#fee2e2,stroke:#ef4444,stroke-width:1px
    linkStyle 29 stroke:#757575,fill:none
    linkStyle 30 stroke:#757575,fill:none
    linkStyle 31 stroke:#D50000,fill:none
    linkStyle 32 stroke:#D50000,fill:none
    linkStyle 33 stroke:#2962FF,fill:none
    linkStyle 34 stroke:#2962FF,fill:none
    linkStyle 35 stroke:#00C853,fill:none
    linkStyle 36 stroke:#00C853,fill:none
Figure 8.1: Real-world supply chain networks are non-linear and have many participants (Coyle et al. 2020). Raw materials flow from suppliers to manufacturing plants, where they are processed into finished goods. These goods are then transferred to manufacturing warehouses for storage, followed by distribution to wholesaler and retailer warehouses. Finally, products are delivered to retail stores for customer purchase.

Warehouse mission

A warehouse prepares and ships products in the required configuration to the next supply-chain stage while protecting their basic form.

Warehouse functionality

Distribution facilities perform 5 functions (Coyle et al. 2020):

  1. Accumulation
  2. Sortation
  3. Allocation
  4. Assortment
  5. Value-added services

Accumulation

A distribution center (DC) collects goods from multiple origins and provides:

  • transfer, storage, and processing;
  • order and shipment consolidation; and
  • larger deliveries to a central point.
Figure 8.2: Larger and cost-efficient deliveries to a central DC (Coyle et al. 2020)

Sortation

Sortation groups like products for:

  • storage in the distribution facility;
  • processing; or
  • transfer to customers.

During receiving, workers:

  1. segment goods by relevant characteristics, including:

    • production lot number
    • stock-keeping unit (SKU) number
    • case pack size
    • expiration date

  2. prepare the groups for safe storage or immediate distribution.

Allocation

Allocation matches available inventory to customer orders for a SKU.

  • The system compares each order with inventory and retrieves the required units.

  • Break-bulk capacity lets several customers order quantities below a full pallet.

    • Example: a beer pallet holds 70 cases of 24 units, or 1,680 units. A DC can allocate individual cases.

Assortment

Assortment combines multiple SKUs held in the DC into customer orders.

  • Customers receive different product mixes from one location.
  • Suppliers can deliver larger quantities to the central DC.
Figure 8.3: Assortment/product mixing allows shipping orders from a single location (Coyle et al. 2020)

Value-added services

Value-added activities meet customer requirements through processing performed inside the distribution facility.

  • Assembly
  • Inventory management and visibility
  • Product kitting, bundling, and unbundling
  • Product postponement
  • Production sequencing
  • Quality control
  • Recycling, repair, and returns management

Main warehouse types in a supply chain

Figure 8.4: Main warehouse types (Frazelle 2016)

Raw-material warehouse

Raw-material warehouses store inputs such as plastics, sand, and metals near the:

  • extraction point; or
  • manufacturing point.

They protect inputs before production and support identification and safe handling.

Raw materials are held to ensure continuous production.

Work-in-process (WIP) warehouse

Holds inventory in or near factories and buffers semi-finished items between steps, keeping flow stable when cycle times vary.

Plant warehouse

Feeds production with inbound parts, kitted materials, and container management, often with cross-dock lanes and close coupling to the shop floor.

Finished-goods and plant warehouses

These warehouses hold products that are ready for sale or transfer to a distribution center. Their buffer stock covers:

  • Launching new products.
  • Anticipated demand surges.
  • Seasonal fluctuations.
Figure 8.5: Samsung products moving through the supply chain via several finished good warehouses (Richards 2014).

Overflow warehouse

An overflow warehouse adds temporary capacity near a plant warehouse during seasonal peaks, promotions, or disruptions. Third-party logistics providers often operate these facilities under short-term agreements.

Distribution-center (DC) warehouses

DCs are usually closer to customers than plant warehouses. They receive products from several plant warehouses and hold them for relatively short periods while filling orders.

The delivery point for the DC determines its name:

  • Home delivery DCs deliver to homes.
  • Retail DCs deliver to retail stores.
  • Omni-channel DCs deliver to a mix of homes and retail stores.
  • Cross-dock DCs do not hold product but simply mix and sort.
Figure 8.6: The role of distribution centers. (source: transportgeography.org).

Cross-dock centers

Cross-dock centers identify, sort, and consolidate inbound goods for dispatch with little or no storage. Same-day receipt and dispatch require pre-labeled items, synchronized vehicles, and accurate information. Perishable goods can use cross-docking when short dwell times protect product quality.

Cross-docking depends on 5 operating conditions:

  • Warehouse management systems: Real-time data must connect inbound and outbound work.
  • Quality control: Rapid handling must preserve product quality.
  • Supplier and carrier reliability: Late arrivals can break the transfer schedule.
  • Warehouse design: The layout must support direct movement and sorting.
  • Demand uncertainty: Volume changes can disrupt planned doors, labor, and vehicles.

Bonded and customs warehouse

Typically sitting outside the customs territory, bonded warehouses allow storage and manipulation of imported goods with duties deferred until release for free circulation, which improves cash flow and simplifies re-export.

Fulfillment-center (FC) warehouses

Fulfillment centers process large volumes of small customer orders, often for electronic retailing. They connect upstream inventory with parcel and home-delivery networks.

An FC moves orders through quickly and uses storage to support fulfillment. It may also process returns. Figure 8.7 shows the fulfillment process at bol.com.

Figure 8.7: A teddy bear moves from receiving through picking and packing to shipping in a robotic mobile fulfillment system.

Amazon fulfillment centers

Amazon’s Fulfillment by Amazon (FBA) service includes storage, fulfillment, customer service, and returns. Products are picked, packed, and shipped to end customers through several facility types:

  • Sortable FCs: Handle smaller, easily sortable items such as books, toys, and housewares.
  • Non-sortable FCs: Manage larger, bulky items like washing machines, pianos, patio furniture, and rugs.
  • Sortation Centers: Sort customer orders by their final destination and consolidate them onto trucks for faster delivery.
  • Receive Centers: Accept large quantities of fast-moving goods and distribute them across the fulfillment center network.
  • Delivery Stations: Prepare orders for last-mile delivery, ensuring fast and efficient everyday delivery.
  • Specialty Centers: Focus on specific categories of items or support peak season operations, such as during holidays.
Figure 8.8: Fulfillment by Amazon (FBA): From receiving orders to picking, packing, and shipping items.

Public or shared-user warehouses

Third-party logistics providers (3PLs) operate public or shared-user warehouses for multiple clients. Clients share space, equipment, and labor under flexible agreements, which can create economies of scale.

Sharing may benefit companies with:

  • common customers and different products, such as retailers and automotive manufacturers;
  • similar products, such as tires, bicycles, and pharmaceuticals;
  • similar services, such as fulfillment or returns processing; or
  • the same environmental conditions, such as hazardous-goods or temperature-controlled storage.
NoteOwnership and management

All warehouse operations can be owned, leased, or managed by third-party logistics providers. These facilities may either be dedicated to a single client or shared among multiple clients as public or shared-user warehouses.

Contract warehouse

Third-party logistics providers manage contract warehouses for one client over an extended period. The building, equipment, staffing, and processes reflect that client’s requirements.

Public-sector warehouse

Public-sector warehouses support government, military, and nonprofit operations. Examples include:

  • Humanitarian aid warehouses: Strategically located facilities established by third-sector organizations to enable rapid response to natural disasters such as earthquakes, droughts, and tsunamis.
  • Local government storage: Warehouses used to store supplies for schools, offices, and other municipal facilities, including items like stationery, uniforms, furniture, and IT equipment.
Figure 8.9: Determining warehouse locations for humanitarian relief distribution in Nepal under various coverage distance scenarios (Maharjan and Hanaoka 2017)

Intermediate, postponement, customization, or subassembly warehouse

These facilities temporarily store products during production and perform customization before final delivery.

Examples of postponement and sub-assembly activities include:

  • modifying or adding packaging or labeling (e.g., language-specific labeling);
  • assembling computers with customized hardware components (e.g., graphics cards, memory modules);
  • incorporating country-specific features (e.g., electrical adapters);
  • creating promotional product bundles.

Consolidation centers and transit warehouses

Consolidation centers receive products from multiple sources and combine them for delivery to customers or production lines. Third-party logistics providers often manage these facilities.

Two common types are:

  • Just-in-Time (JIT) centers: Deliver and sequence automotive parts for precise production line delivery.
  • Retail stock consolidation warehouses: Aggregate products from various suppliers for streamlined retail store delivery. ### Transshipment or break-bulk warehouses

Transshipment warehouses receive large shipments and divide them into smaller quantities for several destinations. Figure 8.10 shows a facility for agricultural products in Rotterdam.

Figure 8.10: Transshipment warehouse for agricultural products in the port of Rotterdam (source: Port of Rotterdam)

Sortation center (hub)

Sortation centers:

  • Sorting goods based on zip/postcode;
  • Consolidating shipments for efficient distribution;
  • Dispatching items overnight to their respective delivery areas.

Letter, parcel, and pallet networks use these facilities. Figure 8.11 shows robots sorting packages in a Chinese warehouse.

Figure 8.11: Robots sorting system helps Chinese company finish at least 200,000 packages a day in the warehouse.

Perishables warehouse

Perishables warehouses handle products with short shelf lives, such as food, flowers, and vaccines.

  • Maintain the cold chain until dispatch.
  • Products typically dwell for very short periods, often just hours.
  • Use refrigerated space carefully because cooling is costly.
  • Ship products using FIFO (First-In-First-Out) or FEFO (First-Expired-First-Out) principles.
  • Adhere to strict handling requirements:
    • Maintain different temperature zones for various products (e.g., chilled and frozen areas).
    • Follow stacking rules to prevent damage and ensure safety.
Figure 8.12: Picnic’s national refrigerated distribution center in Utrecht (source: Warehouse Totaal)

Reverse-logistics (returns) centers

Warehouses dealing with returned items, such as:

  1. Unwanted or defective items. They are returned to the stores by customers, consolidated by third-party contractors, and sent to returns centers. After being checked, items can be repackaged, repaired, recycled, or disposed of (in an environmentally friendly manner, e.g., used as fuel).
  2. Reusable transit packaging (e.g., roll cages, barrels, kegs, pallets, tote boxes, trays). When used in the food industry, added services include washing and sanitizing the items before they re-enter the supply chain (e.g., kegs, “empties” returned to Heineken’s warehouses).

Warehouse size typology (XXS to XXL)

Onstein et al. (2021) propose a footprint-based typology for logistics facilities. The authors use literature, industry reports, and expert interviews to classify Dutch logistics real estate for policy, planning, and research. Table 8.1 shows an overview of the typology. For each size class, it includes:

  • Building size: The floor-area band in square meters and its share of the surveyed floor area.
  • Function: The activity type(s) the facility performs: S = Storage, C = Consolidation, W = Warehousing (receive, putaway, pick), D = Distribution (reduce transit time), CD = Cross-dock, VAL = Value-Added Logistics (e.g., relabel, kit).
  • Product type: The goods the site handles, from generic parcel, pallet, and bulk flows to goods with handling or temperature constraints.
  • Product range and speed: Assortment size and movement rate. A broad, fast assortment usually requires more space and mechanization than a narrow, slow assortment.
  • Market service area: The geographic scope: neighborhood, town or city, regional, national, or international.
  • Service days: The promised delivery time from the facility to the customer.
  • Number of facilities in the Netherlands: The count in the authors’ Dutch database.
  • Types represented in each size range: The facility types observed in each band:
    • Parcel lockers & pick-up points
    • City hubs (incl. UCCs)
    • Parcel & postal sorting facilities
    • Regional food wholesale/retail DCs
    • National retail & e-commerce DCs
    • Manufacturer DCs
    • Bulk facilities
    • Global agricultural auctions
WarningUse the bands as references

The size bands are for reference and analysis purposes. If local policy or a dataset uses slightly different breakpoints, document the mapping in text next to Table 8.1. For example, Acocella et al. (2024) focuses on large sites only, and defines L = 10,000–20,000 m², XL = 20,000–40,000 m², XXL > 40,000 m².

Table 8.1: Larger size bands contain a broader mix of facility types (Onstein et al. 2021). Functions: storage (S), consolidation (C), warehousing (W), distribution (D), cross-docking (CD), and value-added logistics (VAL).
Name Building size Function Product type Product range and speed Market service area Service days Number of facilities in the Netherlands Types represented in each size range
XXS < 200 m² S / D / (and C only for online goods returns) Parcels Broad range
High speed		 Local: Neighbourhood Same day
Next day		 > 8.680 pick up points and parcel lockers Parcel locker
Pick up points
XS 200 - < 2,000 m2 S / C / W / D Parcels
Fresh food delivery		 Broad range
High speed		 Local: Town / City Same day
Next day		 Unknown City hub
S 2,000 - < 8,000 m2 S / C / W / D Parcels Small / broad range
Fast-movers / slow-movers		 Regional Next day 995 Parcel and postal sorting facility
M 8,000 - < 15,000 m2 S / C / W / D / CD / VAL Parcels
Pallets
Bulk		 Small / broad range
Fast-movers / slow-movers		 Regional
National		 Next day
Multiple days		 1024 Parcel and postal sorting facility
Regional food wholesale and retail
National retail or e-commerce facility
Bulk facility
L 15,000 – < 20,000 m2 S / C / W / D / CD / VAL Parcels
Pallets
Bulk		 Small / broad range
Fast-movers / slow-movers		 Mostly National and International (although there are large regional Post and Food retail DCs) Next day
Multiple days		 319 Parcel and postal sorting facility
Regional food wholesale and retail
National retail or e-commerce facility
Manufacturer DC facility
Bulk facility
XL 20,000 - < 40,000 m2 S / C / W / D / CD / VAL Parcels
Pallets
Bulk		 Small / broad range
Fast-movers / slow-movers		 Mostly National and International (although there are very large regional Post and Food retail DCs) Next day
Multiple days		 411 Parcel and postal sorting facility
Regional food wholesale and retail
National retail or e-commerce facility
Manufacturer DC facility
Bulk facility
Global agricultural auction
XXL > 40,000 m2 S / C / W / D / CD / VAL Parcels
Pallets		 Small / broad range
Fast-movers / slow-movers		 National
International (although there are very large regional Post and Food retail DCs)		 Multiple days (online possibly faster) 146 Parcel and postal sorting facility
Regional food wholesale and retail
National retail or e-commerce facility
Manufacturer DC facility
Global agricultural auction

The bands are highly uneven: the lower six classes run from at most 200 m² to below 40,000 m², while XXL is open-ended above 40,000 m². Royal FloraHolland in Aalsmeer illustrates how far that final class can extend, with a reported floor area of about 999,000 m² (see Figure 8.13).

Figure 8.13: Royal FloraHolland Aalsmeer, the world’s largest flower auction complex near Schiphol. Reported floor area ~999,000 m², with daily high-velocity crossdocking of cut flowers and plants through auction clocks, then immediate dispatch via regional hubs and air cargo.

References

Acocella, Angela, A J Acocella, Frans Cruijssen, and Jan Fransoo. 2024. Warehousification: Recommendations for the Future of Big Box Warehouses in the Netherlands. Tilburg University.
Coyle, John Joseph, C. John Langley, Robert A. Novack, and Brian J. Gibson. 2020. Supply Chain Management: A Logistics Perspective. 11th edition. Cengage.
Frazelle, Edward. 2016. World-Class Warehousing and Material Handling. Second Edition. McGraw-Hill Education.
Maharjan, Rajali, and Shinya Hanaoka. 2017. “Warehouse Location Determination for Humanitarian Relief Distribution in Nepal.” Transportation Research Procedia 25: 1151–63. https://doi.org/10.1016/j.trpro.2017.05.128.
Onstein, Alexander T. C., Ishani Bharadwaj, Lóránt A. Tavasszy, Dick A. van Damme, and Abdel el Makhloufi. 2021. “From XXS to XXL: Towards a Typology of Distribution Centre Facilities.” Journal of Transport Geography 94 (June): 103128. https://doi.org/10.1016/j.jtrangeo.2021.103128.
Richards, Gwynne. 2014. Warehouse Management: A Complete Guide to Improving Efficiency and Minimizing Costs in the Modern Warehouse. Second edition. Kogan Page Limited.