Factory-Direct Interior Door Supplier — Built-to-Spec Pre-Hung Systems
MR DOOR US is a U.S.-based interior door manufacturer and supplier delivering complete, factory-assembled pre-hung interior door systems and fully custom interior doors for residential, commercial, and multi-unit projects nationwide.
We produce factory-direct interior doors with aligned slab, frame, hardware, and casing—engineered for predictable installation, consistent quality, and wholesale scalability.
Complete system delivered factory-aligned: door slab, frame, hardware, and casing — ready to install.
Factory-direct control over how your doors are:
Designed, Built, and Delivered.
How Our Pre-Hung Interior Door Installation Works
Our factory-assembled interior door systems are designed for simplified installation. Each pre-hung interior door arrives aligned, squared, and pre-tested — eliminating on-site measuring, hinge adjustments, and hardware alignment.
This is not a slab-and-hardware package. It is a complete pre-hung interior door system — built once, installed once, and ready for predictable results.
Built as Complete Pre-Hung Interior Door Systems — Not Loose Parts
Most interior doors are sold as separate components — slab, frame, hardware, and casing — then assembled on-site.
Our pre-hung interior door systems arrive factory-aligned, fully assembled, and ready for predictable installation.
- Solid or engineered door slab built to specified size, thickness, and finish
- Pre-hung frame & jamb, factory-squared and aligned
- Concealed or surface hinges — installed and adjusted
- Magnetic mortise lock — installed and tested
- Pre-cut casing set — matched, labeled, and packaged. Nothing sourced separately. Nothing aligned on-site.
This approach reduces job-site variability, labor time, and installation errors — especially across multi-unit or repeat projects.
Interior Door Systems — In-Stock, Custom & Wholesale Supply
Whether you need ready-to-install systems or doors built entirely to spec, MR DOOR US supports projects at every stage — from single homes to large-scale developments.
In-Stock Pre-Hung Interior Door Systems
Factory-assembled interior door systems designed for fast, repeatable installation and predictable results. Each unit is built, aligned, and packaged at the factory—ready to install on arrival.Ideal for renovations, flips, tenant improvements, and time-sensitive projects.
Limited in-stock configurations available.
Best for: Contractors, remodelers, and homeowners who need speed, consistency, and factory-direct reliability.
Custom Interior Door Systems Manufacturing
Fully custom interior door systems manufactured under factory-controlled production. Built from drawings, reference images, or detailed specifications, with full control over dimensions, materials, finishes, and system configuration.Produced at scale with consistent tolerances and repeatable results across single builds and multi-unit projects.
Best for: Architects, developers, builders, and designers requiring custom specifications and controlled lead times.
Wholesale & Contractor Interior Door Supply
Factory-direct interior door systems for repeatable specifications and volume projects. Our model delivers consistent quality, scalable production, and predictable lead times—without retail markups or pieced-together components.Supports both in-stock systems and large-scale custom manufacturing with nationwide fulfillment.
Best for: Contractors, developers, and wholesale partners who require dependable supply and long-term project reliability.
Our factory-direct interior door systems are engineered for predictable installation, scalable production, and long-term project reliability across residential and commercial applications.
What’s Included in a Complete Pre-Hung Interior Door System
All full-package luxury pre-hung interior door systems are delivered as a factory-assembled unit — not a collection of slab, frame, hinges, and casing sourced separately and assembled on site.
Each Pre-Hung Interior Door System Includes:
-
Door slab
Solid or engineered core interior door slab, built to specified size, thickness, and finish. -
Pre-hung frame & jamb
Factory-squared pre-hung door frame and jamb aligned to the slab for proper reveal and swing. -
Hinges (Adjustable Concealed or Surface-Mounted)
Adjustable Concealed or surface-mounted door hinges installed, adjusted, and factory-tested. -
Magnetic mortise lock
Pre-installed and precisely aligned for smooth operation and clean aesthetics. -
Pre-cut casing set
Pre-cut interior door casing set matched to the system and packaged together for a consistent trim finish.
Every pre-hung interior door system is factory-assembled, aligned, and tested before shipment — eliminating on-site measuring, cutting, and adjustment. This approach reduces job-site variability, labor time, and installation errors compared to sourcing doors and components separately.
Whether installing a single door or coordinating dozens across a project, the system remains consistent by design.
Why Contractors Choose System-Built Interior Door Systems
FASTER INSTALLATION
Factory-aligned door, frame, and hardware arrive ready to set—less drilling, fitting, and adjustment on site.
FEWER ERRORS & CALLBACKS
Consistent reveals, swing, and hardware fit are checked at the factory—reducing rework across the crew.
CONSISTENT RESULTS
Repeatable specs across every opening—built to the same approved details for single homes or multi-unit jobs.
BETTER PLANNING
One complete unit improves labor estimates and reduces jobsite surprises during installs.
FACTORY QUALITY CONTROL
Each system is assembled and inspected before shipment—turning openings into installs, not fabrication tasks.
Request a Quote for Pre-Hung & Custom Interior Door Systems
Submit your pre-hung or custom interior door system requirements — including sizes, quantities, and finish preferences — and we’ll confirm specifications and provide factory-direct pricing with accurate lead times.
Wholesale Interior Door Supplier & Reseller Programs
Program Overview
Wholesale & Dropshipping:
Partner with MR DOOR US as your factory-direct interior door supplier. We provide complete pre-hung interior door systems with consistent specifications, scalable production, and reliable lead times for contractors, showrooms, resellers, and online sellers.
In-Stock & Custom Interior Door Manufacturing:
Offer in-stock pre-hung systems for fast-moving projects, or submit drawings and specifications for fully custom interior door manufacturing under direct factory control.
- Factory-direct wholesale pricing tiers
- Dedicated interior door supply programs
- Support from single orders to multi-unit developments
Factory-Scale Capacity — Not Limited to Catalog Models
MR DOOR US operates with direct factory control and large-scale production capability of roughly 600,000 interior door sets annually.
Whether you need immediate inventory or fully custom interior door systems built to specification, we support repeatable, scalable supply for single developments or multi-unit projects.
Meet MR DOOR US INC at IBS 2026 – International Builders’ Show Orlando
Join MR DOOR US at IBS 2026 to see the Daegu full-package interior door system in person and discuss custom project requirements directly with our team.
Explore the complete factory-built system, understand how it installs, and review in-stock availability, custom manufacturing options, and project supply capabilities.
This is the best opportunity to evaluate fit, finish, and system quality before committing to larger orders.
As a factory-direct interior door manufacturer & supplier, MR DOOR US delivers complete pre-hung interior door systems engineered for large-scale residential and commercial projects.
MR DOOR US works directly with Dongguan Mingren Industry Co., Ltd — our primary manufacturing partner with large-scale interior door production capacity supporting U.S. supply.
(See our Projects here)
With over 100,000㎡ of production facilities and large-scale annual capacity, our manufacturing network supports both in-stock distribution and custom interior door manufacturing across the United States.
