Replacing an interior door sounds simple until you have to choose between a slab and a complete prehung unit, measure the opening, determine jamb depth, and get the swing direction right. Prehung interior doors come already mounted on hinges inside a frame, which can make them a practical choice for remodels, damaged frames, and new openings.
At Discount Moulding, standard sizes are stocked across locations, with many configurations available for pickup rather than requiring a long special order. Before buying, however, it is worth understanding the measurements and specifications that determine whether the door will actually fit your project.
What Is a Prehung Interior Door?
A prehung interior door is sold as an assembled unit that includes the door slab, frame or jamb, and hinges. Instead of installing a new door into an existing frame, you place the entire framed unit into the rough opening.
That can make prehung interior doors especially useful when:
- The existing frame is damaged
- The frame is out of square
- You are creating a new doorway
- The old jamb has heavy paint buildup or damage
- You want to replace the entire opening rather than adapt a new slab to an old frame
The current prehung-door page states that stocked units arrive primed and ready for finish paint.
Prehung vs. Slab: When Does Full Door Replacement Make Sense?
The condition of the existing frame is usually the deciding factor.
Choose a Prehung Door When:
- The jamb is damaged or rotted
- The opening is out of square
- You are remodeling the full doorway
- Existing hinge locations are no longer usable
- You want a new swing configuration
- There is no existing frame
Choose a Slab Door When:
A slab may make more sense when the existing frame is still straight, solid, and in good condition. A slab includes only the door panel, so the installer must still fit it to the old opening, locate and mortise the hinges, and prepare for the latch or strike.
Discount Moulding’s current guidance notes that many remodels favor prehung units because replacing the whole assembly can be more efficient than adapting a new slab to an old frame.
Measure More Than the Existing Door
Measurements are one of the most important parts of planning an interior door installation. Do not rely only on the width of the existing slab.
Check Door Width and Height
The current stock range runs from approximately 12 inches to 36 inches wide in standard increments. The standard height is 80 inches, while taller 7-foot, 8-foot, and 9-foot options are also listed for certain openings.
Measure Jamb Depth
Jamb depth needs to match the wall thickness.
Current listed options include:
- 4-9/16 inches
- 4-7/8 inches
- 6-9/16 inches
If the jamb is too shallow or too deep, the frame will not align properly with the finished wall surface.
Check the Rough Opening
A prehung unit installs into the rough opening, not simply into the space occupied by the old slab. Before ordering, measure the opening carefully and determine whether framing, drywall, or trim work will affect the final fit.
If you are unsure, the current service page specifically recommends bringing your measurements in for assistance.
Get the Door Swing Right Before Ordering
Swing direction is one of the easiest ordering details to overlook. Discount Moulding instructs buyers to stand in the opening facing the direction the door opens toward them. Hinges on the left indicate a left-hand door, while hinges on the right indicate a right-hand door.
Before placing an order, also think about what the open door could interfere with:
- Light switches
- Closet doors
- Bathroom fixtures
- Furniture
- Hallways
- Nearby doors
This matters even more during a whole-home door replacement project, where a single incorrect swing can disrupt the layout of a room.
Hollow Core or Solid Core?
Core construction affects price, weight, sound control, and how substantial the door feels.
Hollow-Core Doors
Hollow-core doors are lighter and more budget-friendly.
They can work well for:
- Closets
- Pantries
- Utility areas
- Projects where budget is the main priority
At the time of writing, Discount Moulding lists its 6-panel textured hollow-core prehung door at $89.99 for widths from 18 to 36 inches. Pricing can change, so verify the live product price before ordering.
Solid-Core Doors
Solid-core doors are heavier and provide better sound reduction than hollow-core options.
They are often worth considering for:
- Bedrooms
- Bathrooms
- Home offices
- Primary suites
- Rooms next to active living spaces
If you are replacing several doors, one practical strategy is to use solid core where privacy and sound control matter most and hollow core in lower-priority spaces such as closets.
Choose a Style That Fits the Interior
Once the measurements and construction are settled, style becomes easier to choose.
The current product range includes options such as:
- 6-panel textured
- 2-panel smooth
- 1-panel Shaker
- 2-panel Shaker
- 3-panel Craftsman
- Flush panel
- Glass
- Louver doors
A Shaker profile works well in many transitional and contemporary interiors, while a 6-panel door provides a more traditional look. Flush doors suit cleaner modern spaces, and glass or louver designs can solve specific light or ventilation needs. Browse the current interior door styles before finalizing the order.
Pre-Order Checklist for Prehung Interior Doors
Most ordering mistakes happen because of measurements or configuration details, not because someone chose the wrong panel design.
Before buying, check:
- Rough opening width and height
- Finished door width and height
- Wall thickness and jamb depth
- Left-hand or right-hand swing
- Hollow-core or solid-core construction
- Door style
- Single or double-door configuration
- Hinge finish
- Whether surrounding trim will also be replaced
- Pickup or delivery requirements
Discount Moulding prehangs doors in-house and states that it can customize size, swing direction, jamb width, hinge color, and other specifications. That makes this checklist useful even if your opening is not completely standard.
Should You Replace the Door Casing at the Same Time?
Replacing a full prehung unit often affects the trim surrounding the opening. If the old casing is damaged, dated, or no longer fits cleanly around the new frame, it may make sense to replace it at the same time.
You may also want to coordinate the doorway with:
- Other matching interior trim
This becomes especially important during multi-room renovations where older trim profiles may not match the new doors. Planning the trim package at the same time can create a more consistent finished look and reduce the need for another material order later.
Buying Prehung Interior Doors Near Tysons Corner
For Tysons Corner-area projects, local inventory can be useful when timing matters. The Tysons location is listed at 8521D Tyco Road, Vienna, VA 22182, and the current prehung-door page states that many standard sizes are stocked for same-day pickup, subject to specific inventory.
Discount Moulding also advertises pickup and local delivery, which can be helpful when a remodel involves multiple doors or larger configurations. If you are ordering several doors for a home in Tysons, Vienna, McLean, or surrounding Fairfax County areas, check availability before traveling so the required size, core, jamb, and swing are ready.
Questions to Ask Before Getting a Door Quote
A useful quote starts with accurate specifications.
Before requesting pricing, ask:
- Is my width and height currently in stock?
- Which jamb depth matches my wall?
- Can the swing direction be customized?
- Which core type is better for the room?
- Are taller doors available?
- Can hinge finishes be selected?
- Can several doors be prepared for a whole-home project?
- Is local delivery available?
- Is volume pricing available on larger orders?
The current prehung-door page states that volume pricing is available for larger orders and that deliveries can be staged for contractor or whole-house projects.
Get the Configuration Right Before You Buy
Choosing prehung interior doors is less about finding a panel style you like and more about getting the entire configuration right. Measure the opening, determine the correct jamb depth, verify the swing, decide between hollow and solid core, and think about whether the surrounding casing should be updated at the same time.
Discount Moulding stocks prehung doors and related trims for projects in the Tysons Corner area and can help with standard and customized configurations. When you know the sizes, styles, swing directions, and quantities you need, get a door quote for your project.
FAQs
What comes with a prehung interior door?
A prehung unit includes the door slab, frame or jamb, and hinges assembled together. It is installed as a complete doorway rather than hanging a new slab in an existing frame.
Are prehung doors easier to install than slab doors?
They remove some preparation because the hinges and frame are already assembled. However, the entire unit still needs to be installed correctly, so the jamb is plumb, properly positioned, shimmed, and secured.
How much do prehung interior doors cost?
Prices vary by style and construction. At the time of writing, the 6-panel hollow-core prehung model is listed at $89.99, while other hollow-core, solid-core, glass, and louver options are priced higher.
Are solid-core interior doors worth the extra cost?
They can be worthwhile when sound reduction, durability, and a heavier feel matter, especially in bedrooms, bathrooms, offices, and other frequently used rooms.
Can a prehung door be customized?
Yes. The company states that its in-house prehanging process supports customization of size, swing, jamb width, hinge color, and other specifications.