A prehung entry door is supplied as a complete door-and-frame assembly rather than as a door slab alone. Depending on the product, the package can include the frame, hinges, weatherstripping, sill, threshold, and hardware preparation.
For a replacement or new project, prehung construction can simplify specification because the slab and frame are designed as one system. The important question is whether the complete unit matches the rough opening, wall depth, swing direction, performance requirements, and finish.
What is included in a prehung entry door?
A typical exterior prehung assembly may include:
- Door slab
- Head and side jambs
- Hinges
- Sill and threshold
- Weatherstripping
- Hardware preparation
- Door sweep or seal
- Optional sidelights or transom
Exact contents vary by manufacturer.
Prehung vs. slab entry doors
| Feature | Prehung | Slab |
|---|---|---|
| Frame included | Yes | No |
| Hinges | Usually included | Must be prepared separately |
| Installation | Simpler as a complete unit | More fitting work |
| Replacement use | Good when frame is damaged | Good when existing frame is reusable |
| Shipping size | Larger | Smaller |
| Specification | Complete system | Door leaf only |
If the existing frame is sound, a slab replacement may be more economical. If the frame is damaged, poorly sealed, or being replaced during new construction, a prehung system is often more practical.
Common entry-door materials
Fiberglass
Fiberglass is widely used for residential entry doors because it can combine low maintenance, insulation, and wood-grain appearance.
Steel
Steel entry doors are often selected when security, durability, and price are priorities. Insulated steel systems can also provide useful thermal performance.
Wood
Wood offers a premium appearance and can be customized in many species and profiles. Exterior wood requires appropriate finishing and maintenance.
Aluminum
Aluminum is common in modern and commercial entry systems, particularly where slim frames, large glass areas, and custom finishes are important. Thermally broken profiles are useful for exterior applications.
Common sizes
Residential entry doors commonly use an 80-inch height. A 36-inch-wide single entry door is a common starting point, while 32-inch units are also used for secondary entries.
Taller 84- and 96-inch doors are increasingly used in larger or custom homes.
The rough opening is larger than the door unit. Never order a prehung door from the nominal slab size alone.
Entry doors with sidelights
A prehung entry system can include:
- One sidelight
- Two sidelights
- A transom
- Sidelights plus transom
These configurations create a wider or taller opening and require a complete unit specification.
For a 36-inch door with two sidelights, the total unit width depends on the sidelight width. The rough opening must be based on the actual manufacturer dimensions.
Glass options
Entry-door glazing can be specified for different goals:
- Clear glass for maximum visibility
- Frosted or obscure glass for privacy
- Reeded or textured glass for style and privacy
- Low-E insulated glass for thermal performance
- Tempered or laminated glass where required or preferred for safety/security
- Decorative or divided-lite designs for traditional architecture
Do not assume all glass in an exterior door has the same performance. Ask for the actual glass construction and applicable performance values.
Security features
For exterior prehung doors, evaluate the complete system:
- Deadbolt and lockset preparation
- Strike reinforcement
- Hinge-side reinforcement
- Multi-point locking where appropriate
- Door thickness and core construction
- Glass type
- Frame anchoring
- Weather seals
A strong slab does not compensate for a weak frame or poor installation.
What to measure
For replacement projects, record:
- Existing door slab width and height
- Rough opening width and height
- Jamb depth/wall thickness
- Sill condition
- Hinge side
- Swing direction
- Exterior trim dimensions
- Interior casing
- Threshold height
For a new opening, use the manufacturer's rough-opening requirements rather than applying a generic formula.
Special applications
Prehung entry systems are also used for:
- Narrow secondary entries
- Extra-wide residential entries
- Church and institutional entrances
- Commercial storefront personnel doors
- Tall 8-foot entry doors
- Entry systems with sidelights and transoms
The application determines the required frame, hardware, fire/wind performance, and accessibility specifications.
B2B buying checklist
For a project order, specify:
- Exact unit dimensions
- Rough opening
- Frame material
- Door material/core
- Glass configuration
- Finish
- Swing/handing
- Lock preparation
- Threshold
- Sidelights/transom
- Performance requirements
- Packaging
- Quantity
Jusen Door and Windows manufactures custom aluminum entry and door systems for distributors, contractors, and project builders, including custom sizes, glass, finishes, and OEM/ODM configurations.
FAQ
Are prehung doors easier to install?
Generally, yes, because the slab is already attached to the frame and the hinge alignment is established. The rough opening still needs to be prepared correctly.
Can a prehung entry door replace a slab-only door?
Yes, if the rough opening can accommodate the complete frame and the jamb depth and swing are compatible.
What is the most common entry-door width?
36 inches is a common residential main-entry width. Secondary entries may use narrower doors.
Can prehung entry doors have sidelights?
Yes. Sidelights and transoms are commonly supplied as integrated entry systems.
Are aluminum prehung entry doors suitable for exterior use?
Yes, when the system is designed for exterior exposure. For thermally demanding climates, a thermally broken aluminum profile is often preferable.
