Installing an interior door costs $150 to $700 total for a bathroom or bathroom door. Sliding closet doors or double bedroom doors range from $400 to $1,700+, depending on the size, material, and job complexity. Extra costs typically apply for lock installation, trim installation, reframing or resizing the opening, and removing and disposing of the old door.

• Interior bifold doors cost $250 to $800 installed on average, depending on the size, type, material, and site conditions.
• Pocket doors cost $500 to $3,000 for the door and installation. Adding a pocket door to an existing wall is quite a bit more challenging than new construction, so these installations tend to fall on the higher end of the price range.

Installing a pre-hung interior door takes 1 to 2 hours in most cases. These doors are sold with hardware and hinges already installed in a frame (vs. a slab door that is just the door by itself, with no frame, hardware, or hinges). Interior French doors and bifold doors take 3 to 6+ hours to install, depending on the size and if any structural modifications are needed. 

Most interior doors come in standard widths of 24 inches, 28 inches, 30 inches, 32 inches, and 36 inches. The standard height for interior doors is 80 inches (6 feet 8 inches). However, custom sizes are also available for unique spaces.

To measure for an interior door replacement, measure the rough opening width and height at multiple points, and use the smallest measurements. Ensure that you account for any trim or casing that needs to be removed or reinstalled.

When selecting an interior door style, consider the room's purpose, the overall home design, and your personal preferences. Popular styles include traditional paneled doors, contemporary flush doors, glass-paned doors, and rustic barn doors.

To improve sound insulation, choose a solid-core door or a door with a higher Sound Transmission Class (STC) rating. Adding weatherstripping, door sweeps, and insulating the door cavity can also help reduce noise transfer. DIY weatherstripping costs $0.16 to $4.00 per linear foot on average.

Yes, fire-rated interior doors are available to provide additional safety and meet building code requirements in certain areas of a home, such as between the garage and living spaces or in stairwells. Fire-rated interior doors are a common feature in healthcare facilities and nursing homes, to add a layer of protection between patient/resident rooms and the interior connecting hallways.

Many different professionals install interior doors, including carpenters, general contractors, handypersons, and door companies. Hiring a handyperson may be cost-effective if the installation is a straightforward, one-to-one replacement. Hire an experienced installer for anything more complex to ensure the installation is done correctly.

Installing an interior door correctly requires precision to ensure the door is properly aligned for smooth operation. Follow these guidelines when searching for a door installation company near you:

• Check out their reviews on HomeGuide and Google.
• Choose a licensed, insured, and bonded company with a several year track record of installations in your area.
• Hire a professional who has experience working with the type of interior door you're installing.
• Ask for an in-person quote so they can see the area and factor in any special requirements to provide you with an accurate estimate.
• Get at least three estimates with similar details to compare.
• Ask for references or testimonials from previous similar installations.

Asking the right questions can help you choose the best and most qualified professional for your interior door installation:

• Are you licensed, bonded, and insured?
• How long have you been installing interior doors in this area?
• Can you provide a free in-person estimate to ensure it is accurate based on the space?
• Will you provide a detailed breakdown of what exactly the estimate includes?
• What type and material do you recommend for a door in this space, and why?
• How long will the installation take?
• Does the estimate include cleaning up afterwards and removing/disposing of the old door?
• What additional costs should I expect?
• Do you offer any warranties or guarantees?