If you are shopping for a new door, you may have come across the term prehung door. It sounds technical, but the idea is simple. A prehung door comes as a complete door-and-frame unit, with the door already attached to the frame with hinges.
That setup can make a big difference when you are replacing a damaged frame, remodeling a room, or choosing a door for a new opening.
For homeowners in Fairfield, CA, the main question is usually not just what a prehung door is. You also need to know when it makes sense for your project, what measurements matter, and how it compares with a slab door.
At Howards Doors And More, we help homeowners and contractors compare door products for projects throughout Fairfield and surrounding areas. Here is what you should know before choosing one.
What Is a Prehung Door?
A prehung door includes the door, hinges, and frame as one unit. The door hangs inside its frame, so the basic hinge position and door swing come together with the unit.
The frame usually includes two side jambs and a head jamb across the top. Depending on the product, other parts such as casing, a threshold, or weatherstripping may come with the door.
A slab door works differently. A slab gives you the door itself without the frame. You use the existing frame or prepare a new frame for the slab.
This difference matters because your existing frame can determine which option makes the most sense. According to Lowe’s, prehung doors work well when the frame needs replacement or when a project involves a new opening.
When Should You Choose a Prehung Door?
A prehung door often makes sense when you need to replace more than the door slab.
When the Existing Frame Has Damage
Look closely at your current frame before ordering a replacement.
If the jamb has damage, rot, cracks, warping, or other problems, installing a new slab into the old frame may not give you the result you want. A prehung unit lets you replace the door and frame together.
This can matter even more for an exterior entrance, where the frame plays an important role in how the door fits and seals.
When You Are Building a New Opening
New construction and major remodeling projects often start with a rough opening rather than a finished door frame.
In that situation, a prehung unit gives the project a complete door and frame combination to work with. Your contractor can use the door unit’s dimensions when preparing the opening.
If you are still planning the opening, choose the door before final framing whenever possible. The door’s actual dimensions can help determine the space the contractor needs to prepare.
When You Want a New Door and Frame Together
Some homeowners simply want to update the entire doorway.
A prehung door gives you a fresh frame and a new door as one product. This can make sense during a larger remodel when you already plan to remove the existing frame and trim.
Before ordering, ask what comes with the specific unit. Casing, hardware, and other parts may not come standard with every product.
Prehung Interior Doors for Fairfield, CA Homes
Interior doors usually face less exposure than exterior doors, so the decision often comes down to the condition of the doorway and the type of project.
Prehung interior doors in Fairfield, CA, can work well when you are remodeling a room and replacing the existing frame along with the door.
For example, imagine you are changing an old bedroom doorway during a remodel. If the existing jamb has damage or you want to change the entire opening, a prehung unit gives you a door and frame that work together.
They can also make sense for a new room addition. Your contractor can prepare the opening around the dimensions of the selected door unit.
Interior doors also come in many styles and materials. Your choice can depend on the room, the amount of privacy you want, and the look you want throughout the home.
If you are comparing interior door options, you can also explore Howards Doors And More’s interior doors before visiting the Fairfield showroom.
Prehung Exterior Doors for Fairfield Homes
Exterior doors require more planning because they connect your home to the outside.
Prehung exterior doors in Fairfield can make sense when you are replacing an entire exterior door unit or dealing with an existing frame that needs replacement.
The frame, sill, weatherstripping, and surrounding opening all affect how the finished door performs. You should also consider the door swing, jamb size, threshold, glass, hardware, and overall style.
If you are considering a prehung option for an exterior project, explore our exterior doors to compare available styles and products.
For an exterior replacement, accurate measurements matter. The rough opening needs to work with the size of the new door unit. Manufacturers also provide specific requirements for their products, so always check the product instructions before ordering.
The Home Depot’s exterior door guide explains that prehung exterior doors include the door and supporting frame and require accurate measurements before installation.
Prehung Door vs. Slab Door: What Is the Difference?
The easiest way to understand the choice is to look at what you actually need to replace.
A prehung door includes the door and frame. A slab door gives you the door itself.
If your existing frame is in good shape and you want to replace only the door, a slab may fit your project better. If you need a new frame or have a new opening, a prehung unit may make more sense.
Your existing door can also affect the decision.
For example, if you have an older interior door that you want to replace while keeping the existing jamb, you may want to explore slab options first. If the jamb has problems or you are changing the entire opening, look at prehung options.
This is one reason measurements and an inspection of the existing opening matter before you order.
What Should You Measure for a Prehung Door?
Do not rely on the door size alone.
For a prehung unit, you may need measurements for the existing frame, rough opening, jamb depth, door height and width, wall thickness, and door swing. Exterior projects can also require measurements around the sill and threshold.
The exact measurements you need can vary by product and project.
If you are replacing an existing door, take clear photos of the doorway from both sides. Photos can help when you discuss your project with a door supplier.
You should also note where the hinges sit and which direction the door opens.
For exterior doors, the rough opening matters too. Lowe’s recommends measuring the existing frame and checking the jamb depth and door swing when planning a prehung exterior door.
Why Door-Handing Matters
Door handing tells you which way the door swings and which side holds the hinges.
It sounds like a small detail, but ordering the wrong hand can create a major problem.
Stand at the correct side of the doorway and check where the hinges sit and which way the door opens. If you are unsure, bring photos and measurements to the showroom before placing an order.
Does a Prehung Door Include the Hardware?
Not always.
A prehung door commonly includes the door, frame, and hinges. Other items can vary by product.
You may need to purchase the knob, handle, lockset, or other hardware separately. Exterior units may also have additional components such as thresholds or weatherstripping depending on the product.
Always ask what comes with the exact door you are considering.
This simple question can help you avoid surprises when you are preparing for the project.
Does Howards Doors And More Install Prehung Doors?
Howards Doors And More provides doors and related products but does not install them.
If you choose a prehung door, you will need to arrange installation separately. A qualified contractor or door installer can handle the removal of the old unit, preparation of the opening, installation, and final adjustments.
This makes it helpful to discuss your project before ordering. The more your door supplier understands about the existing opening, the easier it becomes to identify the right product configuration.
When a Prehung Door May Not Be the Best Choice
A prehung unit may not suit every replacement.
If your existing frame is in good condition and you only need a new door slab, replacing the complete frame may add work to the project.
You may also have an older home with an opening that needs special attention. Standard sizes do not always match every existing doorway.
That is why you should look at the actual opening before choosing the door type.
For a replacement project, bring your measurements, photos, and details about the existing door to the showroom. Those details can help narrow down the right options.
What Should You Bring to Howards Doors And More?
You do not need to arrive with every answer.
Bring what you know about the project. Photos of the existing door, measurements, the door swing, and information about the frame can all help.
If you are working with a contractor, bring the project specifications they gave you.
For a new opening, bring the rough opening information when available. For a replacement, photos of the existing doorway can help the team understand what you are trying to change.
At the Howards Doors And More Fairfield showroom, you can discuss your project and compare available door options before making a decision.
Choosing the Right Door Starts With the Opening
A prehung door can be a smart choice when you need a new door and frame together, especially for new construction, remodeling, or an opening with a damaged frame.
The key is matching the door unit to the actual project.
Think about the condition of the existing frame, the size of the opening, door handing; jamb depth, style, and hardware. For exterior doors, also consider the threshold and weather-related requirements.
If you are still unsure whether a prehung or slab door fits your project, bring your measurements and photos to Howards Doors And More. Our Fairfield team can help you compare your options based on the project you are actually working on.
Frequently Asked Questions
What is a prehung door?
A prehung door comes with the door attached to its frame with hinges. It gives you a complete door-and-frame unit rather than a door slab by itself.
Are prehung doors good for interior doors?
Yes. Prehung interior doors can work well for remodeling, new rooms, or projects where you need to replace the existing frame along with the door.
When should I choose a prehung exterior door?
A prehung exterior door can make sense when you are replacing the complete exterior door unit, installing a door in new construction, or replacing a damaged frame.
What is the difference between a prehung door and a slab door?
A prehung door includes the door and frame. A slab door includes the door itself. Your existing frame and the scope of your project can help determine which option fits better.
Do prehung doors come with handles and locks?
It depends on the product. Many prehung units include the door, frame, and hinges, while handles, knobs, and locks may come separately. Ask about the exact product before ordering.
How do I measure for a prehung door?
Measurements can include the door size, existing frame, rough opening, jamb depth, wall thickness, and door swing. The exact measurements depend on the product and project.
Can I replace an old door with a prehung door?
Yes, but you need to consider the existing frame and opening. If the frame needs replacement, a prehung unit may be a useful option. Bring your measurements and photos to Howards Doors And More for guidance.
Where can I shop for prehung doors in Fairfield, CA?
Howards Doors And More serves homeowners and contractors from its Fairfield showroom. Visit the showroom to discuss your project and compare available door options.
Find the Right Door for Your Project
Choosing between a prehung and slab door starts with understanding what your project actually needs. If you need a new frame with the door, a prehung unit may be the right place to start.
Visit Howards Doors And More in Fairfield to discuss your project, bring your measurements and photos, and explore available interior and exterior door options.
Ready to talk through your door project? Contact Howards Doors And More today.
Contact Howards Doors And More
Reviewed by Howard’s Doors and More.
Howard’s Doors and More has served homeowners, contractors, and businesses from its Fairfield location since 1987. Our team helps customers compare door, window, moulding, and hardware options for custom homes, remodels, tenant improvements, and home updates.
Last updated: August 11, 2026
Why trust Howard’s Doors and More?
Howard’s Doors and More has operated from its Fairfield location since 1987. The company works with homeowners, contractors, and businesses on door, window, moulding, hardware, remodeling, and new-home projects. Its team can help customers review product options, project plans, measurements, and available configurations before ordering.
For door replacement projects, customers can bring photos, measurements, or contractor specifications to discuss suitable interior or exterior door options. Howard’s Doors and More supplies door products and related materials; installation should be arranged separately with a qualified contractor or door installer.
Visit Our Fairfield Showroom
Howard’s Doors and More
2400 Cement Hill Road
Fairfield, CA 94533
Phone: (707) 437-4666
Email: howardsdoors@sbcglobal.net
Showroom hours: Monday–Friday, 8:00 AM–5:00 PM
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Technical-installation note
Important note for exterior prehung doors
Exterior prehung-door requirements can vary by manufacturer, door material, sill design, local conditions, and the specific opening. Before ordering or installing an exterior unit, confirm the manufacturer’s instructions for the exact product you select.
In general, installers should verify the rough opening, jamb depth, door handing, sill condition, and frame alignment. Exterior installations may also require sill-pan or flashing protection, caulk, shims, insulation, and adjustment of the threshold or sill cap to help the unit close and seal correctly. Lowe’s recommends measuring the existing frame width, height, and jamb depth and checking that the rough opening is square, level, and plumb before installing a prehung exterior door. lowes
Howard’s Doors and More lists manufacturers and suppliers including Therma-Tru, JELD-WEN, Simpson Door, Masonite, Plastpro, T.M. Cobb, and American Building Supply. Link to the relevant manufacturer’s product-specific installation guide once the customer has selected the exact door model. howardsdoors
Sources
- Lowe’s, “Prehung Entrance Doors and Interior Doors vs. Slab Doors.” This source supports the definition of a prehung door, the distinction between prehung and slab doors, and common situations where each can be appropriate.
- Lowe’s, “How to Install a Prehung Exterior Door.” This source supports general guidance on measuring an exterior replacement, checking a rough opening, sill protection, shimming, weatherstripping contact, and threshold adjustment.
- Howard’s Doors and More, About Us, Products, and Services. These pages support business history, the Fairfield showroom, product categories, listed brands, and service-related claims
