New England's Leader in Postal Specialties
Supplying and installing postal specialties like 4C mailboxes, rear loading mailboxes, mail drop boxes, collection boxes, and more.Sales and Installations
Granite State Specialties (GSS) supplies and installs a range of postal specialties throughout New Hampshire, Boston and beyond. Safety is always a priority of ours during our installations, which is why our installers have a minimum of 30 hours of OSHA training to ensure your next project is done safely, and in a timely manner. Reach out and talk to a specialist and get a quote for your next job.
Home Package Box
4CPM Pedestal Mount
Cluster Mailboxes
4C mMailboxes
4-Door Parcel Lockers
2-Door Parcel Lockers
Mini Storage Cabinets
Front/Rear Loading Mailboxes
Front/Rear Loading Mailboxes
Key Cabinets
Collection Boxes
Collection Boxes
4C Mailboxes
4C Postal Mailbox Unit
Smart Lockers by Luxer One
Types
We supply and install everything from standard to cutting edge postal boxes and anything in between. Below is a list of some postal specialties we offer and have experience installing.
- 4C Mailboxes
- Rear loading mailboxes
- Front-loading mailboxes
- Maildrop boxes
- Collection boxes
- Book drops
- Mail directories
- Cluster Mailboxes
- Replacement Mailboxes
- Key cabinets
- Outdoor parcel Lockers
- Indoor parcel lockers
- Mini Storage Cabinets
- Home package boxes
Brands
Our relationships with top manufacturers are why we are able to stand out from our competitors and offer quality products at competitive prices. We supply and install some of the industries premier brands such as the following:
- Auth Florence Mailboxes
- Salsbury Industries
- Bommer
Why GSS?
Hiring contractors without experience in the construction specialty industry to handle products such as postal specialties can end up being a nightmare in the long run. Granite State Specialties not only has experience installing numerous makes, models, and brands of postal boxes but has been supplying and installing them for over 30 years. All of our installers are OSHA trained for a minimum of 30 hours to ensure the safety of your project and the workers involved.
Frequently Asked Questions
We supply commercial mailboxes, cluster box units (CBUs), parcel lockers, mail collection boxes, and mail room furniture for multifamily residential buildings, office complexes, and mixed-use developments. Products comply with USPS and 4C mailbox standards.
4C mailboxes are the USPS-approved horizontal mailbox standard required for all new construction and renovations receiving USPS delivery in multifamily buildings of 4+ units. They replace older 3600 series vertical boxes and include additional security features and parcel compartments.
Yes, and we strongly recommend it. Pairing a 4C mailbox unit with a Luxer One parcel locker system creates a complete mail and package management hub — addressing both traditional mail delivery and the growing volume of e-commerce parcels.
Yes. 4C units are available in a range of aluminum finishes including anodized aluminum, powder-coat colors, and stainless steel fronts, allowing coordination with your building's lobby or corridor design.
We'll assess your building's unit count, mail volume, and USPS delivery requirements, then specify the correct 4C configuration and optional parcel locker add-ons. Submit a quote request or call (866) 966-9113 to start the process.
Yes. We handle complete installation, including wall anchoring, electrical connections for electronic locker units, and coordination with your USPS representative for delivery acceptance.
