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Doors questions, answered by experts

A slab door is a standalone door without a frame or hardware. A prehung door is a complete set that includes the door, frame, hinges, and sometimes the doorknob and lockset.

In most cases, a prehung door is the better and easier option to install, especially for DIY projects or exterior applications, as they often come pre-weatherproofed. They require fewer tools and less experience to install properly. Although prehung doors are heavier and have a higher upfront cost, the investment is often worthwhile for a complete upgrade that includes a new frame.

A slab door may be a better choice if you are on a tight budget, have a custom-sized wall opening, or only need to replace the door while keeping the existing frame. While the initial cost is lower, you will need to purchase all the hardware separately and do more DIY work to hang it, which may not result in significant time or money savings.

Start by checking the top or side edge of the door. Look for a certification label or metal tag stamped with details like the fire rating and information on the manufacturer. Even if it’s painted over, the tag should still be visible. Next, look along the edges for slim intumescent strips. They’re designed to swell up and seal gaps when exposed to heat. Finally, check if the door closes itself. Most fire doors have a self-closing mechanism, like an overhead closer or spring hinges. If none of these are obvious, contact a fire safety professional to help verify your door. 

Yes, prehung doors include a door jamb. Prehung doors are sold as a single piece with the door frame already constructed, including the hinges. The only part missing is the trim, which you add after fastening the door. They are more expensive than slab doors but are quicker and easier to install. Prehung doors come in an array of sizes, so there’s likely an option to fit any doorway you need.

A prehung door is a door that comes ready to install, already mounted in its frame with hinges and stop molding included. Because everything is factory-aligned, installation is quicker, more precise, and convenient, as you don't need to drill or align the hinges yourself. This makes it a smart option if your current frame is damaged, uneven, or if you're working on a new build. Installation involves fitting the entire unit into the rough opening, shimming and leveling it, and then securing it. If you are replacing an existing prehung door, the process is even simpler, often just requiring you to swap the old unit for the new one and secure it with a few screws. Prehung doors typically cost only slightly more (around $20) than a door slab alone, making them an efficient choice.

Yes, new steel doors add value to your home. They improve curb appeal, increase home security, and make your home more energy-efficient. High-quality steel doors are durable, low-maintenance, and insulate well against hot and cold temperatures. Potential buyers often appreciate the added protection and aesthetic upgrade, so new steel doors can help your home stand out and increase its resale value.

The Unalaska, AK homeowners’ guide to door services

From average costs to expert advice, get all the answers you need to get your job done.