Open the door (pun intended) to this DIY project with big impact
If your hollow core interior doors need an update, consider refreshing them on your own. This project is great for veteran DIY-ers and newbies alike because it requires only the most basic tools and materials to complete, like a screwdriver and sandpaper, and just a few hours of work.
Use this guide to refinishing hollow core interior doors to make every entryway in your home shine like new with minimal effort.
There are a handful of important things to know before you can begin refinishing hollow core interior doors, like how they’re different from solid panel doors, why that matters, and how to distinguish the two.
Hollow core and solid panel are the two most common types of interior doors that appear in residential buildings. As the name indicates, solid panel doors are composed of one, solid wood panel. On the flipside, hollow core doors have a cardboard or plastic interior covered by a thin layer of wood or fiberboard.
When comparing hollow core doors vs. solid core doors it’s worth noting that hollow core interior doors are less expensive than their solid panel alternatives, and the reduced price reflects their quality. They aren’t as good at blocking out sound or providing insulation, and cracks, splinters, and fading in the finish are likely to appear more quickly, too.
Fortunately, hollow core interior doors are easy to refinish, but the process isn’t identical to refinishing solid panel doors. That thin, outer layer of wood is too delicate for the chemical strippers and finishes used on solid wood panels. But gel strippers and stains are gentle enough to change this type of door’s appearance without creating any unintentional damage.
Knowing what kind of door you’re dealing with before updating interior doors will ensure you’re using the right materials. But if you didn’t personally install every door in your home, you may not be aware of each door’s type.
There are a couple of ways to determine which door is which. For one, hollow core interior doors are often 25 to 30 pounds lighter than their solid panel counterparts. They will swing open more easily, and feel much lighter when removed from a doorway. You can also check for cracks between layers at the base—this will not occur in solid panel doors because they don’t have layers.
Lay down a drop cloth in the area where you’ll be working to catch dust, debris, and any stray drops of wood stain. Then, use a screwdriver to remove hinges and doorknobs from the door. Set these aside somewhere safe where they won’t get lost, and lay your door down to begin the next steps.
Remove any dust with a microfiber cloth and wipe away any smudges and streaks with an all-purpose cleaner and a cleaning rag. When the door is fully clean, begin sanding to remove any shiny, glossy veneer until nothing remains. Sand by hand rather than with a power sander to protect the thin, outer wood panel from excessive force.
Use wood filler to seal any cracks in the exterior panel and fix your interior door. Remove excess filler with a putty knife, let dry, and sand once more to create a smooth surface.
If you notice that corners of the exterior wood panel have begun to lift, dab each spot with wood glue and press firmly for several minutes to reconnect. Let dry before proceeding to the next step.
While chemical strippers are too strong for delicate hollow core doors, a gel stripper is gentle and will give you the effect you’re looking for. Keep in mind that not all hollow core interior doors are finished to begin with, and in some cases, you may be able to skip this step altogether.
If not, start by cleaning your door once again to remove all dust and debris from sanding. Then, wearing a long-sleeve shirt, protective goggles, and chemical resistant gloves, evenly apply wood stain stripper with a paintbrush. Start with a small test area in a non-visible spot (like where the door and hinge meet), wait until it’s dry, then remove it to make sure it produces the intended outcome. If it does, proceed to cover the entire door in an even layer of stain stripper, let sit until fully cured, then remove completely with a putty knife.
Use a rag to apply a small amount of gel stain to a test spot on your door. Cover the rest of the door in an even layer of gel stain with a foam brush or rag when it's dry and you're sure it's right for you. Let it sit for a few minutes and then wipe away the excess. You may have to repeat this step a couple of times to achieve your desired depth of color.
When the stain is dry, apply varnish if you’d like a polished finish. Otherwise, leave it as-is for a matte texture. When the door is fully dry (after about a day or less, depending on the weather), use a screwdriver to reattach hinges and remount the door to the doorway.
There’s not much of a difference in cost between doing it yourself and hiring a door pro, unless you already have a lot of the materials and tools that you need. On average, you’ll pay between $40 and $90 for professional hollow core door repairs and roughly the same for the materials involved in DIYing the project.
As long as you do it carefully, you can sand and restain hollow core doors. However, it’s risky because the veneers on hollow core doors are so thin that sanding and restaining might cause damage to the doors. If you do move forward with this project, sand the doors lightly with a medium-grit sandpaper.
A hollow core door has an average life expectancy of about 20 to 40 years, with most lasting 30 years before they need to be replaced. Doors that are well cared for can last on the longer end, as long as no severe damage occurs.
When it comes to painting hollow core doors, the top recommended paints to use are semi gloss or satin finish. If you do paint hollow core doors, be sure to gently sand the doors and use a paint primer to ensure the paint sticks.
