| Division 10 Specialties
Postal Specialties
& Mailboxes
Commercial mailboxes and secure parcel delivery systems engineered for multi- family, university, and corporate properties.
Request A QuoteSecure & USPS
Approved Mail
Delivery
From outdoor cluster units to high-tech parcel lockers, Granite State Specialties provides total mail management solutions.
We supply and install USPS-approved Cluster Box Units (CBUs), 4C horizontal mailboxes, and advanced parcel lockers. Our expert team handles everything from layout planning and concrete pad pouring to the precise installation necessary to ensure compliance with strict USPS regulations and ADA accessibility standards.
Whether you are developing a new luxury apartment complex, upgrading a university mailroom, or outfitting a residential subdivision, we deliver secure, weather-resistant solutions that protect tenants’ mail and packages.
Postal Systems
Approved Configurations
Cluster Box Units
(CBUs)
Freestanding, pedestal- mounted outdoor mailboxes. Highly secure and perfect for residential communities and commercial business parks.
4C Horizontal
Mailboxes
Wall-mounted or recessed units required for all new multi-family construction. Fully USPS approved and ADA compliant.
Parcel Lockers
Secure, oversized compartments designed for modern e-commerce package delivery. Available as standalone smart systems or integrated units.
Vertical Mailboxes
Traditional indoor mailboxes designed for replacement purposes in older apartment buildings and college dormitories.
Materials & Security
Engineered for Defense
Heavy-Duty Aluminum
Constructed from thick, extruded aluminum with welded seams to prevent prying, vandalism, and harsh New England weather damage.
Powder-Coated Finishes
Architectural-grade powder coating available in multiple colors (Sandstone, Bronze, Black, Dark Bronze) to perfectly match your property aesthetics.
High-Security Locks
Equipped with USPS-approved master locks and heavy-duty tenant cam locks featuring anti-fish plates to prevent mail theft and tampering.
Featured Brands
Our Trusted Partners
We supply and install the nation’s leading USPS-approved mailbox manufacturers, ensuring
your property passes local Postmaster inspections.
Ideal Applications
Where We Install
Multi-Family
Housing
Apartment
Complexes
Corporate
Campuses
Universities &
Dorms
Military Bases
Gated Communities
Commercial Plazas
Government
Buildings
Why Choose GSS?
The Granite State Advantage
Safety First (OSHA Compliant)
Every installer holds a minimum of 30 hours of OSHA training. Safety and compliance are our absolute top priorities on every active job site we step onto.
Turnkey Accountability
We don’t just act as a middleman. We manage the entire lifecycle—from procurement and logistics to final installation—providing you with a single point of accountability.
Nationwide Supply Network
While we are New England’s trusted installation experts, our robust logistics network allows us to expertly drop- ship specialized products to projects globally.
Unmatched Reliability
With a proven track record of success throughout Boston, New Hampshire, and the broader Northeast, we have the experience to get complex jobs done on time and on budget.
Postal Specialties FAQ
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