Buy a slab door if your frame is in good shape, and buy a prehung door if the frame is damaged, crooked, or missing. This guide on the prehung vs slab door choice covers cost, install work, and which fits your home.
Keep one cost fact in mind from the start. A slab costs less at the store, but a prehung door often costs less once you pay for labor.
TL/DR
- A prehung door includes the door, frame, and hinges as one ready unit. A slab door is the bare door only, so you buy hinges and hardware yourself.
- Slab doors cost $50 to $300, while prehung units run $100 to $400 and up. Labor flips the math, so a slab often costs more once installed.
- A prehung install takes 1 to 3 hours and suits a first-time DIYer. Slab hanging takes 3 to 5 hours or more and needs skilled mortise work.
- Buy a slab for a same-size swap where the frame sits square and solid. Buy prehung for damaged frames, new openings, and exterior doors.
- Older Rhode Island homes settle, so their frames sit out of square. Those crooked openings almost always need a prehung unit.
What Is a Prehung Door?
A prehung door is a complete door unit with the door already hung on its own frame. The factory aligns the door in its jamb with hardware attached, so the swing works correctly from day one. One warning before pickup: a pre-hung unit can weigh up to 100 pounds, so bring a second person. Installing a pre-hung unit means you set the whole assembly into the opening, then level it with shims.
What Is a Slab Door?
A slab door is the bare door with no frame, hinges, or hardware. Think of it as a blank door slab. You attach it to an existing door frame yourself. People also pick a vintage door from a salvage shop and hang it as a slab. Slab doors provide the most design freedom of any type of door.
Prehung vs Slab Door: Quick Comparison
A prehung door includes the frame and hinges, while a slab door is the door alone. The table shows the five differences that decide most projects.
| Prehung Door | Slab Door | |
| What’s included | Door, frame and hinges, pre-cut knob hole | The entire door only |
| Material cost | $100 to $400+ | $50 to $300 |
| DIY level | Easier | Hard |
| Install time | 1 to 3 hours | 3 to 5 hours or more |
| Best use | Bad frames, new builds, exterior doors | Same-size swap in a good condition frame |
Key Differences Between Pre-Hung and Slab Doors
Prehung Door: The unit arrives ready to set. The door already hangs on its own three-sided frame, the factory mortises the hinges in place, and most units carry a pre-cut knob hole plus a cut spot for the strike plate. You still buy the doorknob, lock, and casing trim on your own.
Slab Door: The slab arrives as one flat piece. No frame, no hinges, no hardware. List what you need before checkout: three hinges, a knob set, a strike plate, and screws.
Material Cost
Prehung Door: Units start around $100 for hollow core and pass $400 for solid core and hardwood builds. Exterior versions cost more because of the weather seal and heavier frame.
Slab Door: A basic slab starts near $50, and a solid wood slab can reach $300. Add $20 to $60 for hardware, since none of it comes in the box. The slab wins on shelf price, but the installation costs more because the fitting takes longer. If you hire an installer either way, ask for the total installed price, not the door price.
DIY Level
Prehung Door: This suits a first-time DIYer. You set the unit in the door opening, shim the gaps, check the swing, and screw the frame to the studs. The factory did the alignment work already.
Slab Door: To hang a slab, you cut each hinge mortise by hand, match the hinge spots on the jamb, and hold the door plumb while you fasten it. One bad measurement and the new door drags on the floor or refuses to latch. A gap of an eighth of an inch shows at eye level. That extra work is why pros treat slab door installation as skilled labor.
Install Time
Prehung Door: A set goes in within 1 to 3 hours on a clean opening. The first one takes the longest, and each one after moves faster.
Slab Door: Plan for 3 to 5 hours or more. Cutting each mortise, test-fitting the swing, and trimming or sanding the edges all add time. In an older home with a settled frame, add another hour for planing the door to fit the crooked opening.
Best Use
Prehung Door: Pick it for bad frames, new openings, full remodeling jobs, and exterior doors that need a tight seal against Rhode Island wind and rain.
Slab Door: Pick it for a same-size swap where the frame still sits square and solid. Renters and flippers also use slabs for low-cost cosmetic updates when the frames check out fine.
When Should You Buy a Prehung Door?
Buy a prehung door when the frame is bad, missing, or brand new. Pick a pre-hung door if any of these fit:
- The existing frame is rotted, cracked, or warped
- You are remodeling and need to create an entirely new door opening
- You want the easier DIY path with less risk
- You are replacing exterior doors, since the factory fit gives a weather-tight seal
A damaged door frame never holds a slab well. A fresh unit fixes the frame and the door in one step.
When Should You Buy a Slab Door?
Buy a slab door when your current frame works fine and the sizes match. The slab or prehung call gets easy here. Go slab if:
- The old door closed fine and you just want a same-size swap
- You want a custom, vintage, or barn-style look
- The opening is an odd size and the door needs trimming
- The lowest material price matters most
Mount the slab on the existing jamb with new hinges. No drywall work, no frame tear-out. This retrofit path saves money when the frame is still solid. Just match the size and configuration of the door you remove.
Replace your Doors in Rhode Island
The prehung vs slab door rule matters most at your entry, where a tight seal blocks New England weather all year. The Window Source of Rhode Island installs entry doors and patio doors across the state from our Smithfield office. The Window Source of Rhode Island gives free in-home estimates with written prices.
FAQs
Is a slab door cheaper than a prehung door?
A slab costs less to buy, around $50 to $300. Labor to hang it costs more, so the installed totals often even out.
Can you put a slab door in an existing frame?
Yes, if the frame is square and in good condition. Match the size, attach new hinges, and the slab hangs right in.
Do prehung doors come with handles?
No. A prehung unit includes the door, frame, and hinges. The doorknob and lock sell separately, so add them to your budget.
Are prehung doors better for exterior doors?
Yes. The factory-fit frame gives a tight seal for weatherproofing, which matters in Rhode Island wind and rain.