The USPS 1:5 parcel locker mandate is a CO condition on high-density properties — not a guideline. Properties that fail the ratio block certificate of occupancy or generate ongoing resident package failures. Ironpost Works installs Florence 1590 Valiant parcel locker systems to the correct ratio, with USPS coordination and postmaster sign-off included.
USPS requires a minimum 1:5 parcel locker ratio on all new centralized mail installations. On a 100-unit property, that is a minimum of 20 parcel locker compartments. Properties that fall below this ratio at CO inspection face delayed occupancy. Properties that ignore it post-occupancy face ongoing USPS delivery failures that erode resident satisfaction and trigger management liability.
The 1590 Valiant is the USPS-approved outdoor parcel locker system for centralized mail infrastructure. Both configurations support standalone installation or CBU-integrated mounting.
Two oversized parcel locker compartments. Right-size configuration for smaller CBU clusters where the 1:5 ratio is met by a single standalone unit adjacent to the CBU bank.
Four oversized parcel locker compartments. Standard configuration for high-density properties, student housing, and developments where parcel volume drives a higher ratio requirement than the 1:5 minimum.
Unit count review and 1:5 parcel locker ratio calculation. Configuration recommendation specifying the correct number and type of 1590 Valiant units to meet USPS requirements.
Engineered concrete pad for standalone locker installations. Anchor bolt placement per USPS specification. Foundation assessment for CBU-integrated mounting.
Florence 1590 Valiant supply and installation. Standalone or CBU-integrated configuration per site requirements and USPS placement standards.
Arrow lock procurement and USPS installation coordination. Lock keying, carrier key provisioning, and USPS acceptance included in project scope.
Postmaster meeting, compliance documentation, and delivery activation. Parcel locker installations are not complete until USPS confirms the system is active and compliant.
As-built documentation, compliance photos, USPS sign-off letter, and ratio verification report — structured for CO submittal or HOA and management records.
Parcel lockers extend the capacity of a CBU system. Florence 1570 Series cluster box unit installation with integrated or standalone parcel locker configuration is the complete centralized mail infrastructure solution for HOA communities and multifamily properties.
CBU InstallationParcel locker ratio compliance is confirmed at Gate 1 of our 5-Gate Quality Control System (QCS-001) — before a single anchor bolt is set. CO-blocking non-compliance is identified in the assessment phase, not at final inspection.
Our ProcessTell us your unit count and we'll calculate the correct 1590 Valiant configuration and provide itemized pricing within 48 hours.