Choosing a door can seem simple until you start comparing the options. A door for a bedroom does a very different job from the door at your home’s main entrance.
That difference matters when you are replacing a door, remodeling a room, or choosing doors for a new project. Interior and exterior doors differ in how they are built, where they are used, and what they need to handle.
If you are comparing interior vs. exterior doors, the right choice starts with where the door will go and what you need it to do.
For homeowners and contractors in Fairfield and the surrounding area, Howard’s Doors and More helps customers compare door products at its Fairfield showroom. Here is what to know before you order.
What Is the Difference Between Interior and Exterior Doors?
The biggest difference comes down to the environment each door faces.
Interior doors separate rooms inside a home or building. They usually do not face rain, direct sun, or outdoor temperature changes. Because of that, manufacturers can focus more on style, privacy, weight, and how the door works within the room.
Exterior doors sit between the inside and outside. They need to handle outdoor conditions while also helping protect the opening from air and moisture.
The U.S. Department of Energy’s Building America Solution Center notes that exterior doors can affect heating and cooling loads, especially when older doors leak air or lack proper insulation and air sealing.
That difference affects almost every part of the door, from its construction to its frame and hardware.
How Are Interior Doors Built?
Interior doors generally have a lighter job.
They separate spaces such as bedrooms, bathrooms, hallways, closets, and home offices. Depending on the design, they can provide privacy, reduce sound between rooms, or simply add a certain look to the space.
You will find many interior door styles, including doors with panels, smooth surfaces, glass, and other design details.
The frame matters too. An interior door needs to work with the existing opening, hinges, trim, and hardware.
For example, replacing one bedroom door in an older Fairfield home can require more attention than simply choosing a door with the same width. The panel design, thickness, hinge locations, and bore location can all affect the finished result.
If you are exploring options for a remodel or replacement, you can view Howard’s Doors and More’s interior doors for ideas before visiting the showroom.
How Are Exterior Doors Built?
Exterior doors face a much tougher environment.
They sit between your conditioned indoor space and the outdoors, so the complete door system needs to account for weather, air movement, moisture, security, and daily use.
Exterior door systems can include features such as weatherstripping, thresholds, insulated cores, and other components designed for the opening. The exact features depend on the door and product.
The Department of Energy recommends considering factors such as thermal performance, air leakage, water resistance, durability, maintenance, and comfort when selecting doors.
This is why you should not automatically use an interior door in an exterior opening. The door needs to suit the conditions around the opening.
If you are planning a front, back, side, or other exterior entrance, you can explore Howard’s Doors and More’s exterior doors to compare available options.
Interior vs Exterior Doors: Key Differences
When comparing the two, look at more than appearance.
Construction
Interior doors can focus more on room-to-room use and appearance. Exterior doors need construction that suits exposure to outdoor conditions.
Some exterior doors use insulating materials within the door. Weatherstripping around the door can also help reduce unwanted air movement.
Weather Protection
This is one of the clearest differences.
Interior doors do not normally need to keep rain or outdoor air from entering the building. Exterior doors do.
An exterior door needs to work as part of a larger opening that includes the frame, threshold, seals, and surrounding wall.
Energy Performance
Exterior doors can affect how much conditioned air enters or leaves a home.
An older or poorly sealed exterior door may allow unwanted air movement. The Department of Energy points out that upgrading an old, uninsulated, poorly installed, or poorly air-sealed exterior door can help reduce energy loss.
Interior doors generally do not have the same role in separating conditioned indoor space from the outdoors.
Hardware
Both types can use hinges, handles, locks, and other hardware, but the requirements can differ.
An exterior entrance may need hardware suited to security and outdoor exposure. An interior bedroom or bathroom door may have different hardware needs based on privacy and everyday use.
Before ordering, make sure the hardware works with the specific door and opening.
Door Frame
The frame plays an important role with both types of doors.
With an interior replacement, you may want to keep the existing frame and replace only the door. This can make measurements such as hinge placement, thickness, and bore location especially important.
Exterior replacements may involve the complete door system, including the frame and threshold, depending on the project. In some cases, though, an exterior door can also be replaced on its own. If the existing frame is in good shape and the door fits the opening properly, the door can often be replaced without changing the frame. Give the showroom a call before bringing a door in so the team can help you decide what makes the most sense for your project.
What About Glass Doors?
Glass can work in both interior and exterior doors, but the application matters.
An interior door with glass can help bring light between rooms or create a specific design.
Exterior doors with glass can add natural light and change the appearance of an entry. However, the glass and complete door system need to suit an exterior application.
When assessing energy-efficient residential doors and other glazing products, the Department of Energy recommends taking into account factors such as U-factor and solar heat gain.
So if you like the look of a door with glass, make sure you are comparing products designed for the location where you plan to use them.
Can You Replace an Interior Door With an Exterior Door?
You should choose a door based on the opening and its intended use rather than simply picking a heavier or more durable-looking product.
An exterior door belongs in an exterior application because its construction and related components serve a specific purpose.
Likewise, an interior door should suit the room and opening where you plan to use it.
If you are unsure about the right product, bring photos and measurements to the showroom. Talking through the project before ordering can help you avoid choosing a door that does not fit the opening or meet the needs of the space.
What Should You Check Before Ordering?
Before choosing a replacement door, look at the existing opening.
For an interior door, check the door’s height, width, thickness, hinge locations, handing, and bore location. Also look at the existing frame and trim.
For an exterior door, consider the opening, frame, threshold, swing, hardware, and other details that affect the complete door system.
If you are replacing one door while keeping the existing frame, accurate measurements become even more important. Bringing the door in to the showroom for accurate measurement is the team’s preference before placing an order.
Take photos of both sides of the door and opening. If you can safely remove the existing door for measurement or bring it to the showroom, that can provide useful information for a replacement project.
Choosing Doors for a Fairfield Home
When you are comparing interior doors in Fairfield, CA, the style of your home can play a big role. You may want a replacement door that blends with the doors already in the house.
For an exterior project, think about both appearance and the demands of the opening. Your front door can affect the look of your home, while the complete door system also needs to suit an exterior application. Compare exterior door options.
At Howard’s Doors and More, homeowners and contractors can visit the Fairfield showroom to discuss their door projects and compare available products.
The company provides doors and related products but does not provide installation. If your project requires installation, you will need to arrange that separately with a qualified installer or contractor.
What Contractors Should Consider
Contractors often need to balance the design of the project with the technical details of the opening.
For commercial or residential work, make sure the door specification matches the intended application before ordering. Measurements, handing, hardware, frame details, and project requirements can all affect the final selection.
Howard’s Doors and More also supports qualifying contractor projects with services such as special orders, takeoff support, and job site delivery.
That can make the showroom a useful place to discuss the door requirements before placing an order.
Interior vs. Exterior Doors: Which One Is Right for Your Project?
The answer starts with the location.
Interior doors work between indoor spaces and give you plenty of options for style, privacy, and room design. Exterior doors need to handle the added demands of the outdoor environment while fitting the home’s overall look.
When comparing your options, consider the door’s construction, opening, frame, hardware, weather exposure, and overall purpose.
If you are still deciding between interior and exterior door options, bring your project details to Howard’s Doors and More in Fairfield. Photos, measurements, and information about the existing opening can help the team understand what you need.
Frequently Asked Questions
What is the main difference between interior and exterior doors?
Interior doors separate rooms inside a building. Exterior doors separate indoor space from the outdoors and need to handle conditions such as weather, air movement, and temperature changes.
Can I use an interior door as an exterior door?
An interior door generally does not suit an exterior opening because it does not serve the same purpose or face the same conditions. Choose a door designed for the location.
Are exterior doors thicker than interior doors?
Exterior doors can have different construction and thickness than interior doors, but the exact dimensions depend on the product. Always check the specifications for the door you plan to order.
What should I consider when choosing an exterior door?
Consider the opening, frame, threshold, door swing, hardware, weather exposure, appearance, and the door’s overall performance for the application.
What should I consider when replacing an interior door?
Check the existing door’s size, thickness, hinge locations, handing, bore location, frame, and design. These details can help you find a replacement that fits the existing opening.
Where can I find interior doors in Fairfield, CA?
Howard’s Doors and More has a Fairfield showroom where homeowners and contractors can discuss projects and explore door products.
Where can I find exterior doors in Fairfield, CA?
Howard’s Doors and More provides exterior door products from its Fairfield showroom. Bring your project details or measurements so the team can help you compare appropriate options.
Find the Right Door for Your Project
The right door starts with understanding where it will go and what the opening needs.
If you are replacing an interior door, remodeling a room, or planning an exterior entrance, take measurements and photos before you order. If you are unsure which type fits your project, bring that information to Howard’s Doors and More.
Visit the Fairfield showroom to discuss your project and explore interior and exterior door options.
Ready to compare your options? Contact Howard’s Doors and More to discuss your next door project.
Reviewed by Howard’s Doors And More
Howard’s Doors And More has served homeowners and contractors from its Fairfield showroom since 1987. The team helps customers compare interior and exterior doors, along with moulding, hardware, and related door products for residential and commercial projects.
Visit the Fairfield Showroom
Bring your measurements, photos, existing door, or project details when you visit. The Howard’s Doors And More team can help you compare interior and exterior door options based on your project.
Howard’s Doors And More
2400 Cement Hill Road
Fairfield, CA 94533
(707) 437-4666
Monday through Friday, 8:00 AM to 5:00 PM
