How to do this $40 DIY door upgrade without taking the door down 👇 A lot of you asked if this would work on a door still on the hinges, so I tested it. It does — and here’s the full process I used: 1. Measure the flat recessed panels you want to cover on the existing door. You want the hardboard insert sized to fit those center areas cleanly. 2. Cut hardboard/MDF panels to those measurements. You can cut them yourself or have the store cut them for you. 3. Cut picture frame molding for the trim border around each panel. Use a miter saw or even a simple miter box if that’s what you have. 4. Assemble each new panel first off the door so you’re not trying to build it vertically. I attached the molding to the hardboard panel using instant bond glue + activator to make assembly faster and easier. 5. Prime everything. I primed the assembled panels before installing them so I wasn’t trying to get full coverage after they were already attached. 6. Caulk the seams/gaps on the assembled panels for a cleaner finished look. This step makes a huge difference once painted. 7. De-gloss / prep the door surface before attaching anything. You want the existing door finish cleaned and scuffed so the new panel adheres better. 8. Use the same instant bond glue + activator on the door to attach the finished panels while the door is still hanging. That was the part everyone asked about — and yes, this is how I made it work without removing the door. 9. Press panels into place carefully and check alignment with level before fully committing. Since the door is vertical, you want to be intentional here. 10. Final caulk + paint touchups once installed so it looks seamless and built in. That’s it. Same upgrade, same look — just adapted for a door that stayed up the whole time. Save this for when you’re ready to make a builder-grade door look custom. buildergradeupgrade diydoorupgrade interiordiy homediyprojects budgetfriendlydiy