How to Upgrade Interior Doors (Closets, Slabs & Materials)
If you’re looking for how to upgrade interior doors, there are a few simple changes that can completely improve the look and feel of your home. Most homeowners don’t realize you can update things like closet doors, door slabs, and even reuse existing frames instead of doing a full replacement.
In this guide, we’ll break down the best ways to upgrade your interior doors without overcomplicating the process.
Check out the full video below to see how it’s done 👇
Table of Contents
Fiberglass Vs. Steel doors: What’s the difference?
One of the most common questions when choosing new doors is whether to go with fiberglass or steel.
Steel doors are typically more affordable, but they’re more prone to dents and surface damage over time, especially in high-traffic homes or if you have kids.
Fiberglass doors tend to cost a bit more, but they’re much more durable. Instead of denting, they’re designed to absorb impact and hold their shape better over time. That makes them a stronger long-term option for most residential interior and exterior applications.
Upgrading Closet Doors the Smart Way
Closet doors are often overlooked in a remodel. A lot of homes still use basic bifold doors or inexpensive track systems that don’t really match the rest of the interior.
One upgrade that makes a big difference is using standard interior door slabs instead of typical closet kits. If you choose a slab that matches your interior doors, the entire space feels more cohesive and custom.
The key is making sure you’re not buying a pre-bored door (unless you need it). For closet applications, you typically want a clean slab without hardware cutouts.
From there, you can use closet door hardware systems that mount at the top and allow the doors to slide or hang cleanly without bulky framing.
Why the Door Jamb Matters
The door jamb is the frame that the door actually sits in, and it plays a bigger role than most people think.
Most standard homes are built with a 2×4 wall, which results in a jamb width of around 4 5/8 inches. However, if you have thicker walls (like 2×6 construction or masonry), you may need a wider jamb or filler pieces to properly fit the opening.
Getting this wrong can lead to gaps, misalignment, or doors that don’t close properly—so it’s worth paying attention to before ordering anything.
Common Mistakes When Buying Interior Doors
Here are a few things we see all the time:
- Buying pre-bored doors when a clean slab is needed
- Mixing door styles that don’t match throughout the home
- Ignoring jamb width and wall thickness
- Choosing low-quality closet door kits that don’t last
A little planning upfront can save you from having to redo it later.
Frequently Asked Questions
Can you replace interior doors without replacing the frame?
Yes. In many cases, you can replace just the door slab without removing the existing frame (also called the jamb). If your current frame is in good condition and properly aligned, swapping the door is a simple and cost-effective upgrade that avoids unnecessary demolition.
What’s the difference between a door slab and a prehung door?
A door slab is just the door itself, with no frame or hardware attached. A prehung door comes already mounted inside a new frame with hinges installed. Slabs are typically used when you want to keep your existing jamb, while prehung doors are used for full replacements.
Can I upgrade closet doors without using a standard closet kit?
Yes. Instead of using basic bifold or kit-style closet doors, you can use interior door slabs with a track or hanging system. This creates a more custom look and allows your closet doors to match the rest of your interior doors.
What should I check before buying new interior doors?
Before purchasing, check:
- Whether your existing jamb is reusable
- The correct door size and thickness
- The type of material (fiberglass vs steel)
- Whether you need a slab or prehung door
- The style consistency with the rest of your home
Ready to Upgrade Your Interior Doors?
We help homeowners across the Phoenix area modernize their spaces with better interior doors, closet door solutions, and full remodeling support when needed.
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