USPS-Approved Mailboxes in California

USPS-Approved Mailboxes in California Cluster & Pedestal Multi-Family Options

U.S. Mail Supply provides USPS-approved multi-family mailboxes throughout California. We offer durable, high-quality options for new developments and multi-unit housing projects. Our cluster box units (CBUs), pedestal mailboxes and other solutions meet USPS regulations for secure, centralized mail delivery. Always check with your local postmaster for specific installation guidelines.

Multi-Family Mailboxes for New Property Developments in CA

California’s growing multi-family housing market demands reliable, secure mail delivery solutions. USPS-approved mailboxes provide convenient access for residents while meeting postal regulations in new developments.

U.S. Mail Supply offers durable mailbox systems ideal for apartment buildings, townhomes and condominiums. Our cluster and pedestal mailboxes are built for longevity and simple installation.

U.S. Mail Supply Has Multi-Family Mailbox Solutions ForApartment Complexes

  • Condominiums
  • Townhome Communities
  • Student Housing
  • Senior Living Facilities
  • Military Housing
  • Public Housing Authorities
  • Mixed-Use Developments
  • Affordable Housing Projects
  • Property Management Companies
  • Real Estate Developers
  • New Multi-Family Construction Projects
  • Renovation & Retrofit Projects
  • HOAs (Homeowners Associations)
  • Section 8 and Government-Sponsored Housing
Multi-Family Mailbox Solutions

Requirements for Multi-Family Mailboxes in CA

Mailbox regulations in California are primarily governed by the United States Postal Service (USPS) standards, local municipal codes and specific requirements for multifamily dwellings.

It's essential to consult with local authorities or the local postmaster to comply with any additional regulations or standards specific to your area.

  • Placement and Height
    Mailboxes in California must be installed 6 to 8 inches back from the curb, with the bottom of the mailbox or mail entry point positioned 41 to 45 inches above the ground or road surface.
  • Address Visibility
    Each mailbox must clearly display the address number, with numerals at least 1 inch high, placed on the front or the flag side of the mailbox for visibility.
  • Cluster Box Units (CBUs)
    For new construction or major renovations, USPS requires the use of STD-4C Horizontal Mailboxes or Cluster Box Units (CBUs). The highest tenant lock must be no more than 67 inches above the finished floor and the lowest must be at least 28 inches above.
  • Parcel Locker Ratio
    In multi-family housing, there must be at least one parcel locker for every five mailbox compartments in new installations.
  • Mailbox Supports
    Must follow California Department of Transportation (CALTRANS) standards using wood (max 4"x4") or metal (max 2" diameter), buried less than 24" deep. Plastic posts are not permitted and metal or wood posts must meet crashworthiness criteria.
  • Locking Mailboxes
    In California, locking mailboxes are permitted and increasingly popular for added security. All locking mailboxes must be USPS-approved, with slots large enough to accept normal daily mail and unfolded Priority envelopes. USPS carriers do not accept mailbox keys and will not open locked boxes, so the design must allow easy mail deposit without carrier access to the lock.
  • Building Codes
    Multi-family projects must meet California Building Code and USPS mailbox standards. No single statewide code applies to all developments.
  • Americans with Disabilities Act (ADA) Compliance
    Accessible compartments must be 15–48 inches above the floor for forward/side reach per ADA guidelines.
  1. Site-Constructed Single-Family Developments
    Developers must coordinate with the USPS during the design phase, as centralized mail delivery with secure parcel lockers is the standard for new communities. If new homes are within one block of existing ones, they may adopt the same delivery method pending USPS review; otherwise, current centralized delivery standards apply.
  2. Mobile or Trailer Home Developments
    Permanent developments must have permanent lot assignments, public road maintenance and typically use centralized, curbside or sidewalk delivery as determined by USPS. Transient developments receive mail at a single USPS-approved location, with park staff handling internal distribution.
  3. Apartment Communities
    Use USPS-approved 4C centralized mailbox units with at least one parcel locker per five mailboxes, installed near main entrances and accessible to carriers. Outdoor units require USPS approval, must avoid streets or sidewalks and include a canopy with lighting and weather protection.
  4. Student Housing & Off-Campus Dormitories
    USPS delivers mail in bulk to a designated representative for distribution within dormitories, with no individual mailbox delivery provided. Dormitories—defined by shared living spaces—require early coordination with a USPS Growth Manager and may need named designees to accept mail.

Fastest Growing Multi-Family Property Investments in California

Multi-family housing continues to shape California’s urban landscape, with several cities leading the nation in new apartment and condo development. No metro is embracing this trend more aggressively than San Diego-Chula Vista-Carlsbad, which ranked #3 among large metros nationwide; an impressive 73.4% of all new housing units built there in the most recent year were multi-family. This surge reflects both population growth and strong demand for walkable, amenity-rich living environments among young professionals and downsizing retirees.

Other California cities are also making significant strides in the multi-family sector:

  • San Jose-Sunnyvale-Santa Clara ranks #5 among large metros, with 67.3% of new construction classified as multi-family.
  • Los Angeles-Long Beach-Anaheim follows closely, with 60.9% of new units being multi-family-placing it firmly among the top ten large metros nationwide.
  • San Francisco-Oakland-Berkeley rounds out California’s leaders, with 60.0% of new housing built as multi-family.

With California ranked #11 overall in the U.S. for new multi-family housing development, the state remains a top destination for investors, developers and property managers seeking high-growth, high-demand markets. If you’re managing or investing in multi-family properties in San Diego, San Jose, Los Angeles or other rapidly growing California metros, now is the time to explore our mailbox solutions.

Fastest Growing Multi-Family Property Investments in California
Top Multi-Family Property Management Firms in CA

Top Multi-Family Property Management Firms in CA

Several top property management firms in California are driving multi-family housing growth, overseeing everything from luxury apartments to large townhome communities. U.S. Mail Supply offers a wide selection of USPS-approved mail delivery systems, trusted by top firms for reliable, compliant mailbox solutions-whether for cluster mailboxes in city developments or pedestal units in suburban neighborhoods, meet tenant needs and enhance property appeal.

Good Life Property Management

Dedicated to simplifying property ownership, offering services such as tenant screening and maintenance for multifamily properties.

Harland Property Management

Provides multifamily property management services, focusing on maximizing property value and unique properties.

Glaser Property Management

Highly rated for its comprehensive property management services in Los Angeles.

  • 10940 Wilshire Blvd, Suite 1600 PMB 450, Los Angeles, CA 90024
  • (310) 905-9479

Choose U.S. Mail Supply for Your Multi-Family Mailbox

  • USPS Compliance Guaranteed
  • Constructed With High-Quality Materials
  • Custom Design & Sizing Options
  • Nationwide Delivery Network
  • Woman-Owned Business
  • Installation Support
  • USPS & Unit Quantity Guidance
  • Volume Discounts
  • Solutions For Every Multi-family Property Type
Equip your multi-family development with the best USPS-approved mailboxes in California. Contact U.S. Mail Supply today for a consultation and to explore our range of cluster, pedestal and other mailboxes for multi-family properties.

USPS-Approved Mailbox FAQ

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USPS-Approved Mailboxes for California Multi-Family Properties In:

  • San Diego
  • Sacramento
  • Fresno
  • Oxnard
  • Santa Rosa
  • Ventura
  • Santa Clarita
  • Riverside
  • Chico
  • Bakersfield
  • Inglewood
  • Redding
  • Burbank
  • Costa Mesa
  • Stockton
  • Huntington Beach
  • Simi Valley
  • Torrance
  • Lodi
  • El Monte
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