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One Door per 8–12 Units: Apartment Locker Sizing for Property Managers

One Door per 8–12 Units: Apartment Locker Sizing for Property Managers The fastest sizing rule for most apartment communities is roughly one locker door for every 8 to 12 units, with a minimum cabinet depth of 19 inches and optionally 23 in

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Measuring an apartment locker compartment

The fastest sizing rule for most apartment communities is roughly one locker door for every 8 to 12 units, with a minimum cabinet depth of 19 inches and optionally 23 inches where oversized packages are common. This ratio works because it balances resident pickup speed against footprint cost, but it only holds if you know your actual delivery volume. Before ordering anything, it is best to track daily package counts over a sampling period of a few weeks or request a site survey.

TL;DR:

  • Proper locker sizing depends on accurate delivery data, with a common ratio of one locker door for every 8 to 12 units, depending on property volume.
  • Increasing cabinet depth from 19 inches to 23 inches can significantly reduce the need for manual handling of oversized packages, but adds to footprint and cost.
  • A sampling period of a few weeks to collect delivery and pickup metrics ensures a more reliable size than generic rules of thumb.
  • Hybrid systems combining lockers with a package room are advisable when oversized shipments or seasonal peaks are frequent.
  • Site constraints and ADA requirements for clear floor space must be verified before installation to ensure accessibility and proper system function.
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Table of Contents

Standard Locker Door Sizes and Door-Mix Templates

Locker banks are typically sold in small, medium, large, and extra-large compartments, with internal openings ranging from roughly 3 inches high for small parcels to 16 inches or more for oversized items. Cabinet depth is the dimension property managers overlook most often, and it directly determines how many packages fit without stacking or forcing.

A practical starting mix for most properties looks like this:

  • Low-volume properties (fewer than about 150 units): a majority small doors with fewer medium and large doors, sizing around one door per approximately 10 to 12 units.
  • Medium-volume properties (roughly 150 to 300 units): a more balanced mix of small, medium, and large doors, sizing about one door per 8 to 10 units.
  • High-volume properties (including student housing or heavy e-commerce use): higher proportions of medium and large doors, sizing near one door per 6 to 8 units.

Depth matters because a 19-inch cabinet handles standard boxes but forces oversized items into overflow storage. Institutional installation data from an ETSU smart mail centers report found that operators who moved from 19-inch to 23-inch depth reduced the share of packages that could not fit and required manual handling. The trade-off is footprint: deeper cabinets consume more square footage and cost more per door, so the right depth depends on how many large e-commerce boxes your property actually receives.

How to Calculate Required Capacity From Your Property Data

Sizing a locker system from a rule of thumb gets you in the ballpark. Sizing it from your own delivery data gets you the right answer. A Penn State field study modeling carrier delivery patterns and resident pickup found no universal locker configuration works across buildings, and that sampling or simulating building-specific data consistently outperforms generic vendor guidance.

Collect these four inputs before calculating locker needs:

  1. Delivered package counts averaged over a reliable sampling period.
  2. Typical pickup time for packages before residents retrieve them.
  3. Proportion of packages too large for smaller locker sizes.
  4. An estimate of seasonal volume peaks, especially during holiday periods.

To calculate needed capacity, divide average daily deliveries by the average pickup turnaround in days to estimate concurrent occupied doors, then add a buffer for peak demands and oversized packages.

A Penn State-backed sizing insight: tracking four operational metrics, namely deliveries per day, percent oversized, average dwell time, and percent picked up within 24 hours, lets managers convert observed behavior directly into a doors-needed figure.

Sampling package delivery and pickup data for a period of a few weeks, ideally covering both typical and peak times, provides a more reliable basis for sizing decisions than shorter periods.

Installation and Accessibility Checklist

Before you finalize a locker order, resolve the site constraints that determine whether the system will actually fit and function where you want it. ADA guidance on forward reach sets a maximum high forward reach of 48 inches and requires 30 by 48 inches of clear floor space in front of accessible compartments, which limits how high you can mount usable doors and how much clearance the surrounding aisle needs.

Work through this checklist with your installer:

  • Accessible compartments: confirm at least some doors sit within the 48-inch reach limit with clear floor space in front.
  • Aisle clearance: leave enough room for wheelchair access and package cart maneuvering, typically 36 inches minimum.
  • Anchoring and mounting: verify floor load capacity and wall attachment points before delivery day.
  • Power and network: automated systems need a dedicated electrical circuit near the install location, along with either hardwired ethernet or a cellular connection, plus surge protection.
  • Backup power: a battery or UPS backup keeps the system operational during short outages.
  • Service access: leave rear or side access for technicians, along with adequate lighting and a security camera pointed at the bank.

Pro Tip: Confirm your electrical contractor runs conduit to the install site before the locker hardware arrives, since retrofitting power after installation day adds cost and delays go-live by weeks.

USPS also updated its expectations for parcel lockers in apartment buildings, requiring new or remodeled properties to install USPS-approved centralized mailbox equipment that includes parcel locker capacity, which is worth confirming with your local postmaster before finalizing plans.

Installation and Accessibility Checklist — overview diagram

Lockers vs. Package Rooms vs. Hybrid Systems

Automated lockers work best for properties with predictable, moderate volume and a resident base comfortable with self-service pickup. They size cleanly using the doors-per-unit math above, but they struggle with unusually large items and holiday surges that exceed available doors.

A staffed or automated package room fits properties with higher volume, more oversized freight, or student housing where deliveries cluster around move-in and exam periods.

Hybrid setups pair a locker bank for standard parcels with package room square footage for oversized and overflow items. A reasonable starting ratio is one square foot of package room shelving for every two locker doors, adjusted once you have real oversized-share data. Industry reporting on rising parcel volumes confirms that properties planning for overflow, rather than assuming a single system will absorb every peak, avoid the packed-hallway scenario that frustrates residents and staff alike.

  • Choose lockers alone when volume is steady and oversized items are rare.
  • Choose a package room when oversized freight or seasonal spikes are common.
  • Choose a hybrid when you want locker convenience without losing overflow capacity.

Operational Best Practices and Future-Proofing

Modular locker banks that let you reconfigure door sizes without replacing the whole unit protect your investment as delivery patterns shift. Look for compartments that can be resized or repurposed as e-commerce box sizes change year to year.

  • Daily: clear expired holds and confirm doors are ready for new deliveries.
  • Weekly: run an audit against your package room software to catch mismatched or forgotten parcels.
  • Signs you need managed visits: overflow packages piling up, resident complaints about missing items, or staff spending hours sorting instead of leasing.
  • Common installation surprise: underestimated electrical capacity, which is why a site survey before ordering saves rework later.

What Property Managers Get Wrong About Sizing

The biggest mistake is buying a locker system sized for today’s move-in traffic instead of a sampled average across a full season. Good sizing paired with consistent daily management, not hardware alone, is what actually keeps a package room from backing up. Start by collecting two weeks of delivery data or requesting a site visit before you spec anything.

— Postal Solutions

Getting Your Locker System Sized, Installed, and Managed

The company sells and installs Luxer One® locker solutions and automated package room systems, sized to your property’s actual delivery data rather than a generic template. To request a quote, have your daily package counts, a floor plan of the proposed location, and your preferred install site ready. Start with a site visit and quote to get sizing recommendations specific to your building.

Sources

FAQ

What is the standard size of a locker?

There is no single standard size since locker banks are sold in small, medium, large, and extra-large compartments with varying internal dimensions. Cabinet depth typically runs between 19 and 23 inches, with 23 inches recommended where oversized e-commerce packages are common.

What are the standard locker sizes in locker rooms?

Apartment package lockers are sized and configured differently compared to gym or athletic lockers, with door heights classified in categories from small to extra-large based on parcel needs rather than following any fixed locker room sizing standard.

How big are 24-7 lockers?

Automated package lockers available for pickup around the clock use the same size categories, small through extra-large, as standard package lockers, with depths generally between 19 and 23 inches. The specific mix a property needs depends on its delivery volume and oversized package share, not a fixed dimension.

What happens if a package is too big for a locker?

When a package exceeds the largest available door, it typically gets routed to an overflow package room or held at a staffed location rather than placed in the locker bank. This is why properties with a meaningful share of oversized deliveries benefit from a hybrid locker and package room setup instead of lockers alone.

How much clearance does ADA require around apartment lockers?

ADA guidance requires 30 by 48 inches of clear floor space in front of accessible compartments, with a maximum high forward reach of 48 inches. This determines both aisle width and how high accessible locker doors can be mounted.