Cluster mailboxes—also known as CBU (Cluster Box Units) or community mailboxes—are now the gold standard for secure, efficient delivery in neighborhoods, multifamily properties, condos, and commercial campuses. Secure, parcel-friendly, and offering centralized convenience, high-quality cluster mailboxes protect privacy, prevent package theft, and meet today’s USPS and municipal requirements.
Yet, choosing the right cluster mailbox is a challenge. There are dozens of models, various security standards, material/construction differences, and wide feature/price ranges. Property managers, HOA members, and apartment owners want the best protection and durability possible, but must balance budget with performance.
This guide reviews the best cluster mailbox systems under $2000 (as of 2025), detailing the top models, what to look for, USPS regulations, installation, and essential accessories—empowering you to buy with confidence.
Table of Contents
- What is a Cluster Mailbox?
- Why Choose a CBU? Benefits vs. Traditional Boxes
- USPS Compliance Explained
- Top Features: What Makes a Superior Cluster Mailbox
- The 7 Best Cluster Mailboxes Under $2000 (2025 Reviews)
- How to Choose: Capacity, Security, Durability
- Installation Tips & Considerations
- Maintenance & Security Upkeep
- Frequently Asked Questions
1. What is a Cluster Mailbox?
A cluster mailbox (CBU) is a centralized, freestanding mail delivery system consisting of multiple mailbox compartments, typically used by several families, tenants, or businesses in a community or commercial area. Most modern cluster mailboxes are:
- USPS Approved: They meet strict standards for postal delivery and security.
- Configurable: Available with 4 to 16 compartments, parcel lockers, outgoing mail slots, and often customizable numbering/labeling.
- Durable: Built from heavy-duty steel or aluminum, weather- and tamper-resistant.
- Secure: Each tenant compartment locks individually; parcel lockers allow large package drops.
- Freestanding/Pedestal Mounted: Easy to place in central locations.
2. Why Choose a Cluster Mailbox?
Advantages Over Traditional Mailboxes
- Security: Locking units prevent mail and package theft.
- Postal Efficiency: USPS delivers to a single location, not door-to-door—faster, more consistent delivery.
- Durability: Powder-coated steel/aluminum builds outlast plastic or wood.
- Package Ready: Parcel lockers handle today’s e-commerce boom.
- Compliance: Most new HOAs, apartments, and developments require CBUs by code.
3. USPS Compliance Explained
The United States Postal Service strictly regulates cluster mailboxes sold for new and replacement installations. To be USPS Approved, a cluster mailbox must have:
- Specific lock, key, door, and labeling standards.
- Parcel lockers sized for modern packages.
- Weather and tamper resistance.
- Outgoing mail compartment.
- Approved mounting system.
Warning: Unapproved or imported CBUs may be rejected by USPS and unusable for delivery. Always verify approval (“F Series” or latest spec) before buying.
4. Top Features: What Makes a Superior Cluster Mailbox
a) Mail Compartment Count:
How many tenants (residents, businesses) do you need to serve? Standard: 4, 8, 12, or 16.
b) Parcel Lockers:
Essential for packages. Modern 8-door/12-door models have 1–2 parcel lockers; larger units offer more.
c) Lock & Hinge Quality:
Heavy stainless locks and continuous hinges prevent prying, vandalism.
d) Weather Resistance:
Look for powder-coat finishes, rust-proof materials, rain guards, and sloped tops.
e) Mounting:
Pedestal mounting is most common. Ensure concrete anchoring hardware is included.
f) Tenant Numbering:
Laser-etched or engraved labels resist weather/fading—choose clear numbering for tenant convenience.
g) Customization Options:
Color, extra parcel lockers, outgoing mail slots, and custom doors/names.
5. The 7 Best Cluster Mailboxes Under $2000 (2025 Reviews)
All models fully USPS Approved and built for security and durability—each earns top reviews for reliability and value.
1. Florence 1570-8T2 Cluster Box Unit with 8 Doors & 2 Parcel Lockers
- Price: $1475–$1650
- Capacity: 8 mail doors, 2 integrated parcel lockers, 1 outgoing mail slot
- Materials: USPS F-Series, heavy-gauge aluminum
- Mount: Heavy pedestal
- Warranty: 5-year manufacturer
Why it’s a Top Pick:
Florence is the most trusted name in CBU hardware, meeting every USPS regulation. This model is the “workhorse” of new subdivisions and apartments: sized perfectly for 8 residences/businesses, with dual oversize parcel lockers for Amazon deliveries. Finish options include classic postal gray, elegant sand, black, and bronze. Secure tenant locks, anti-pry doors, rain shielding, and a 5-year warranty make it unbeatable under $2000.
Best For:
Most mid-size residential or business clusters wanting a worry-free, out-of-the-box solution.
2. Salsbury 3308S-2P Cluster Box 8 Doors with 2 Parcel Lockers
- Price: $1550–$1720
- Capacity: 8 mail slots, 2 parcel lockers, outgoing slot
- Materials: Heavy-duty, vandal-resistant aluminum
- Mount: Pedestal (included)
- Warranty: Limited lifetime
Why it’s a Top Pick:
Salsbury has been a leader in secure mail storage for decades. The 8-door + 2 parcel locker combination is ideal for communities with high package deliveries. The “F Series” build quality ensures smooth, silent operation, superior weather-resistance, and lifetime reliability. These units shine in harsh climates.
Best For:
HOAs, condos, and complexes aged 8–16 units (use 1–2 units); also perfect for small business parks.
3. Florence 1570-12T1 Cluster Box, 12 Doors and Parcel Locker
- Price: $1720–$1850
- Capacity: 12 tenant doors, 1 large parcel locker, outgoing slot
- Materials: Powder-coated extruded aluminum
- Special: Vandal-resistant heavy cam locks
Why it’s a Top Pick:
Room for more tenants—an excellent option for medium-sized buildings or offices. The single extra-large parcel locker fits boxes up to 16 inches—perfect for increased package drops.
Pros:
- Largest single-unit tenant capacity under $2000
- Flexible numbering, doors can be keyed alike for families
4. Salsbury Industries 3316S-2P 16-Door Cluster Mailbox
- Price: $1920–$1998
- Capacity: 16 mail slots, 2 parcel lockers
- Material: Aircraft-grade aluminum alloy
- Keys: 3 per tenant, heavy-duty master lock
Why it’s a Top Pick:
Unmatched tenant capacity for the money—serve an entire small apartment or condo in a single secure unit. Reinforced hinges and anti-fish baffles stop theft. Black, bronze, gray, and white finish options.
Best For:
Apartment complexes, office parks, and commercial buildings.
5. Florence 1570-4T1 4-Door Cluster Box with Parcel Locker
- Price: $1250–$1350
- Capacity: 4 tenant compartments, 1 parcel, outgoing slot
- Material: Weatherproof aluminum, tamper-resistant locks
- Extras: Smaller footprint for tight spaces
Why it’s a Top Pick:
For boutique condo buildings, duplexes, or gated enclaves, the 4-door CBU gives maximum security and delivery convenience without taking up unnecessary space.
Pros:
- Easy installation by property owners
- All hardware and keys included
6. Mail Boss 1628 Secure Cluster Mailbox
- Price: $1599–$1799
- Capacity: 8–10 tenant slots, parcel locker
- Material: 12-gauge galvanized steel body, commercial locks
- Special: Extra anti-theft baffles, USPS & private delivery compatible
Why it’s a Top Pick:
Extreme security—heavier-than-spec steel, laser-welded seams, anti-pry latches, and the best master door reinforcement in its class. Excellent for higher-risk locations seeking maximum break-in resistance.
Best For:
Urban multifamily, downtown business, or anywhere package theft is common.
7. Auth-Florence Outdoor CBU Suite (Multi-Color)
- Price: $1750–$1900
- Capacity: 8–12 tenant compartments, 2 parcel lockers
- Materials: Marine-rated enamel, corrosion-proof, all aluminum
- Feature: Marine warranty, customizable faceplate
Why it’s a Top Pick:
Specially finished for marine/coastal environments—salt, humidity, and sun won’t break down the paint or locks. Choose custom colors to match property branding, or select school/campus themes.
6. How to Choose Cluster Mailboxes (Expert Advice)
A) Calculate Capacity
- Residential: One door per unit/dwelling. If you have 24 homes, order two 12-door CBUs or three 8-doors, etc.
- Commercial: Factor in business tenants and their anticipated mail/parcel volume.
- Growth: Always plan one slot for growth (vacancies, new tenants, ad-hoc deliveries).
B) Parcel Locker Necessity
- Modern e-commerce = frequent package deliveries.
- Minimum: 1 parcel locker for every 10 mail units, per USPS guidance.
- High package volume? Choose more parcel lockers, or buy auxiliary parcel units for under $2,000.
C) Security & Material
- All models here use steel or heavy aluminum, but look for anti-pry baffles, reinforced lock plates, and sealed seams if you’re in a high-risk area.
D) Color & Customization
- Public-facing? Pick powder-coated bronze, black, or white for a classy look that blends with modern exteriors.
- Engraved labels/numbers last longer and stay readable.
- Some brands offer custom placards with HOA/complex names.
7. Installation Tips & Considerations
- Site Prep: Pour a level, reinforced concrete pad (minimum 4” thick) for the pedestal.
- Weather: Avoid mounting where snow, sprinkler spray, or direct runoff pools at the base.
- Access: Place within easy walk for tenants and visible from the road (deterring thieves).
- Lighting: Consider motion or dusk-to-dawn lights overhead for security and nighttime access.
- Anchoring: Use all included anchor bolts; for high wind/hurricane zones, specify extra kits.
- Professional Help: Electricians/handymen can run wiring for lights or security cameras if desired.
Pro tip:
Take photos as you open/install the locks and doors, and keep a “master key” locked in the property manager’s safe.
8. Maintenance & Security Upkeep
- Cleaning: Wash with gentle soap and warm water twice yearly. Wax powder-coat finishes to prevent sun fade.
- Lubricate Locks: Use graphite or silicone (never oil-based) once a year.
- Check for Damage: Inspect all doors/hinges quarterly for tampering or prying.
- Key Control: Maintain a strict log of key distribution and replacements.
- Snow/Ice: Clear walkways and access promptly in winter.
9. Frequently Asked Questions
Q: Are all CBUs on Amazon or marketplace sites USPS approved?
A: No! Some lookalike/cheap imports are not certified and postal carriers may refuse to use them. Only buy models explicitly marked “USPS Approved F-Series.”
Q: What about outgoing mail—is it secure?
A: CBUs include a secure outgoing slot, but outgoing mail is less protected than locked compartments. Advise tenants to avoid putting cash/checks in outgoing.
Q: Can you re-key the locks?
A: Yes, all quality CBUs allow for locks to be replaced or re-keyed; many property managers replace every 3–5 years or after resident turnover.
Q: Is it legal for me to open tenant boxes if I manage the building?
A: No. Only the postal service and the assigned key-holder may legally open mail compartments, unless you are providing private (not USPS) mail delivery.
Conclusion: Which Cluster Mailbox Is Best for You?
For most HOAs, apartments, or condo complexes, the Florence 1570 series and Salsbury F-series CBUs represent the best value under $2000: tough, reliable, and fully compliant, with enough variety to match property size and style.
- Go for 8–12 door units with parcel lockers for flexibility.
- If you’re in a high-risk area, Mail Boss offers extra physical security features worth the small premium.
- For coastal or marine climates, consider Auth-Florence’s enhanced marine finish.
No matter which CBU you choose, you’ll be making a smart, future-proof investment in tenant safety and property value.