A 4C mail suite is not a furniture decision — it is a USPS-specified infrastructure system governed by STD-4C tenant door counts, parcel locker ratios, and ADA door-handle height requirements. Ironpost Works manages the full scope: compliance analysis, rough-in coordination, suite installation, and USPS sign-off, for both recessed new-construction and surface-mount retrofit applications.
The right configuration depends on your building type, construction phase, and USPS access requirements. Ironpost Works specifies the correct approach and carries it through to postmaster sign-off.
Integrated into the wall structure during framing — the correct approach for new multifamily and mixed-use construction. Requires coordination with the GC during rough-in so the alcove, backing, electrical (if required), and clearances are specified before drywall.
Mounted to existing wall surfaces for retrofit applications — the standard approach for older multifamily properties replacing non-compliant lobby mail systems. No structural demolition required, but existing infrastructure must be assessed for compliance gaps before specification.
Unit count review, tenant door requirements, and parcel locker ratio analysis against current USPS STD-4C requirements. Completed before specification to prevent CO-blocking non-compliance.
Alcove dimensions, wall backing requirements, and clearance specifications provided to the GC team during framing — eliminating costly post-drywall rework.
Permit application and municipal submittal. Ironpost Works carries the mail infrastructure permit scope independently — no burden on the GC or property owner.
Supply and installation of the 4C horizontal mail suite configured to STD-4C specifications — tenant doors, parcel lockers, and carrier access panel properly integrated.
Forward-reach and side-reach measurements per 28 CFR §36.304 on every suite section. Written ADA verification included in the CO documentation package.
Postmaster meeting, STD-4C compliance documentation, arrow lock procurement, and delivery activation. The project is not complete until mail service is active.
New construction 4C suite scope specified and installed before CO. Pre-construction compliance review ensures no mail infrastructure surprises at final inspection.
Ironpost Works delivers the rough-in specifications your team needs at framing, then returns for installation. One scope, one permit, one documentation package — no coordination burden on your PM.
High-rise and mixed-use lobby mail suites require precise STD-4C sizing and ADA compliance that standard finish contractors are not equipped to deliver. Ironpost Works specializes in this scope.
4C suites include parcel lockers per STD-4C requirements, but properties with high e-commerce volume often require additional capacity. Florence 1590 Valiant standalone parcel locker systems integrate with 4C suite installations to meet the 1:5 ratio mandate on high-density properties.
Parcel Locker SystemsEvery 4C suite project follows our 5-Gate Quality Control System (QCS-001), beginning with a pre-construction compliance review at Gate 1 — the step that prevents CO delays. No gate is skipped. No compliance condition is discovered at final inspection.
Our ProcessSubmit your project details and we'll respond with a STD-4C compliance review, scope recommendation, and itemized pricing within 48 hours.