Replacing an interior door is one of those home improvement projects that can make a room feel noticeably fresher without requiring a full remodel. Whether your old door is damaged, outdated, or simply no longer matches your home, installing a new one is a project many homeowners can tackle with the right tools and a little patience.
If you’re planning to replace an interior door in your West Valley home, here’s a straightforward guide to help you understand the process.
1. Measure Your Existing Door
Before buying a replacement, grab a tape measure and take a few measurements. You’ll want to know the door slab width, height, and thickness, as well as the location of the existing hinges and doorknob.
A standard-looking door isn’t necessarily a standard size, so don’t rely on appearance alone. Measure your existing door carefully. If you’re replacing the entire prehung door unit, you’ll also need to measure the rough opening and determine whether the door swings inward or outward and whether it’s left- or right-handed.
Getting the measurements right at the beginning can save you from an expensive return trip to the hardware store.
2. Decide Between a Door Slab and a Prehung Door
There are two common ways to replace an interior door.
A door slab is just the door itself. This can be a good option when your existing frame, hinges, and trim are in good shape. You’ll need to transfer or install the hinges and bore the holes for the handle if they aren’t already prepared.
A prehung door comes with the door already attached to a new frame. This can be the easier choice if your existing frame is damaged, out of square, or you want a completely fresh look.
For a simple door replacement, keeping the existing frame can save time and money – but only if the frame is in good condition.
3. Remove the Old Door
Start by removing the existing door from its hinges. Depending on the hinge style, you may be able to tap the hinge pins upward with a hammer and nail or simply remove the screws.
Once the door is off, inspect the frame. Check for loose screws, cracked wood, damage, or signs that the frame is no longer square. This is also a good time to make sure the new door will sit properly without rubbing against the frame.
If you’re keeping the existing hardware, remove the hinges and handle from the old door and keep the screws and parts organized.
4. Prepare the New Door
If you purchased a slab door, you may need to transfer the hinge locations from the old door to the new one. Measure carefully and use a chisel or router to create the hinge recesses.
You’ll also need to install the door handle or lockset. Many replacement doors come with the holes already drilled, but others require you to drill them yourself.
Take your time here. A hinge that’s even slightly out of position can cause the door to sit unevenly or rub against the frame.
5. Hang and Test the Door
Once the hinges are installed, carefully hang the new door. Open and close it several times, checking for rubbing, uneven gaps, or sticking.
Ideally, you want a consistent gap around the door and a smooth swing. If something isn’t quite right, don’t force it. Small adjustments to the hinges or door can make a big difference.
After everything is working properly, install the doorknob, latch, and strike plate.
6. Finish With Trim and Touch-Ups
If you replaced the entire door frame, you may need to reinstall or replace the casing and trim. Fill nail holes, caulk the appropriate joints, and paint or stain the new door and trim as needed.
And that’s it – you’ve got a new interior door!
When Should You Call a Professional?
A door replacement can be a manageable DIY project, but it can become more complicated when the opening is out of square, the frame is damaged, the flooring has changed, or the new door requires significant modification.
If you’d rather have the job handled for you, Damian’s Handyman and Remodeling Services helps homeowners throughout the West Valley, including Surprise, Sun City, El Mirage, Waddell, Avondale, Goodyear, Buckeye, Peoria, and Glendale.
Whether it’s a single interior door or part of a larger home improvement project, getting the installation right can make the finished result look better and work properly for years to come.