A Complete Guide to Prefabricated Doors for Modular Buildings

Choosing the right doors for a modular building is about more than function; it affects safety, accessibility, workflow efficiency, aesthetics, and long-term durability. Panel Built offers a wide range of prefabricated doors engineered specifically for modular construction. From standard swing doors to specialty options like ballistic-rated, hurricane-rated, and impact-resistant doors, each solution is designed to integrate seamlessly into our panelized modular wall systems.

Whether you’re outfitting a modular office, guard booth, clean room, equipment enclosure, or security structure, understanding the different types of paneled doors will help you select the right fit for your building’s purpose and environment.

Why Modular Buildings Require Specialized Door Systems

Panel Built modular structures are engineered, prefabricated, and assembled using panelized wall systems, meaning that every door must integrate cleanly into a precise, premanufactured opening. The right modular door improves:

• Safety and code compliance
• Energy efficiency
• User flow and access control
• Durability in high-traffic environments
• Visibility and supervision
• Security and protection

Because each building serves a unique application—from manufacturing to government facilities—we provide tailored door configurations for every project.

Swing doors are the most widely used building door system across Panel Built modular offices, mezzanine structures, guard booths, and in-plant buildings.

Understanding Door Handing and Swing Direction

Every swing door has a directional “hand”:

• Left-handed: hinges on the left when viewed from the outside
• Right-handed: hinges on the right when viewed from the outside
• Inward swing: swings into the room
• Outward swing: swings out from the room

Proper handing is essential for safety, fire codes, security, and furniture/equipment clearance.

Types of Panelled Swing Doors

Panel Built offers several swing door styles to accommodate visibility, safety, and design preferences:

1. Flush Doors

• No window
• Ideal for privacy or equipment rooms
• Clean, simple aesthetic

2. Half-Glass Doors

• Window in the upper half
• Improves visibility in high-traffic areas
• Helps prevent collisions

3. Full-Glass Doors

• Maximum visibility for safety
• Modern, professional aesthetic for office spaces
• Great for conference rooms, modular offices, and visitor areas

Single vs. Double Swing Doors

• Single doors: standard for office and personnel use
• Double doors: ideal for equipment rooms, furniture movement, or wide-load access
• Available in flush, half-glass, and full-glass options

For more information on our swing doors, you can visit our Door Specifications page to get the details on our system.

Sliding doors are commonly used in compact structures—especially guard booths or buildings located between traffic lanes.

Why Sliding Doors Work Well for Security Structures

• No door panel swings into traffic or walkways
• Efficient use of interior space
• Allows officers to step out quickly without obstruction

Modern Sliding Door System with Magnetic Hardware

Panel Built’s upgraded sliding door solution includes:

• Cavity Sliders wall-mounted hardware
• Magnetic locking mechanism
• Stronger seal than hook-bolt systems
• Smooth, consistent operation
• Traditional key-locking capability
• Heavy-duty extruded aluminum track
• Protective track cover for clean aesthetics

These modular door assemblies are built to withstand daily use, ensuring long service life in high-traffic environments.

Roll-up doors are used when larger equipment or material access is required.

Types of Roll-Up Doors

Panel Built offers three main roll-up door systems:

1. Manual Chain-Hoisted Roll-Up Doors

• Most economical option
• Ideal for low-frequency use
• Reliable and simple to operate

2. Motorized Roll-Up Doors

• Convenient push-button operation
• Ideal for frequent access

3. High-Speed Roll-Up Doors

• Fast open/close cycles
• Great for temperature-controlled spaces
• Helps maintain energy efficiency

Integrating Roll-Up Doors Into Modular Wall Systems

To support roll-up systems, Panel Built fabricates:

• Heavy-duty steel-framed openings
• Custom widths and heights
• Fully insulated assemblies

These allow roll-up doors to function like traditional overhead systems while maintaining the modular building’s structural integrity.

For facilities with unique safety, security, or regulatory needs, Panel Built manufactures multiple specialty building door options.

Ballistic-Rated Doors

Designed for Panel Built ballistic-rated buildings, these doors can meet:

• NIJ ballistic levels
• UL-752 standards
• STANAG ballistic requirements

Available in:

• Swing or sliding door styles
• Half-glass or full-glass ballistic polycarbonate windows

These doors provide enhanced protection without sacrificing visibility.

Hurricane-Rated Doors

Used primarily in structures installed along the Florida coast, these doors include:

• Welded-steel frames
• Impact-rated safety glass
• Reinforced components for high wind loads

Perfect for guard booths, security huts, and coastal applications.

Dutch Doors

A two-part door with separate top and bottom panels.

Ideal for:

• Transaction windows
• Attendant booths
• Customer service openings
• Improved communication without full entry

Optional countertops can be added for convenience.

Impact Traffic Doors

Heavy-duty double doors designed for repeated collisions and rugged use.

Features include:

• Bottom-half bumpers
• Durable core construction
• Smooth, swinging impact panels

Commonly used in:

• Warehouses
• Manufacturing environments
• High-traffic material handling areas

Doors play a crucial role in the performance, safety, and usability of any modular structure. Whether you need standard swing doors, space-saving sliding doors, heavy-duty roll-up systems, or specialty safety-rated options, Panel Built offers an extensive range of prefabricated doors tailored to your project's needs. Our expertise in modular construction ensures every door integrates seamlessly with your building’s design, functionality, and long-term durability.

Request a Quote for Prefabricated Doors

Looking for the right door solutions for your modular building? Panel Built can help you choose from a full range of modular door systems, each engineered for performance, safety, and longevity. Contact our team today to request a quote or discuss the best door configuration for your facility.