What Are Interior Doors?
Interior doors are doors installed inside residential spaces, including bedrooms, bathrooms, closets, kitchens, pantries, laundry rooms, and home offices. A well-chosen interior door helps organize the interior of a house, supports privacy, and becomes a visible design element in the room.
When choosing interior doors for home use, buyers usually compare the door type, opening mechanism, material, finish, glass option, size, and installation format. United Porte offers interior home doors for both classic and modern interiors, including ready-made options for standard residential projects.
Types of Interior Doors Available
United Porte offers a wide selection of interior doors for your homes. The main door types include swinging, sliding, folding, hidden, and architectural systems.
| Door Type |
Best For |
Main Benefit |
| Single swing doors |
Bedrooms, bathrooms, offices |
Classic, practical, easy to use |
| Double swing doors |
Living rooms, wide openings, master bedrooms |
Elegant look and wider access |
| Hidden / frameless doors |
Modern and luxury interiors |
Flush wall appearance and minimalist design |
| Barn doors |
Closets, bedrooms, pantries |
Space-saving sliding system |
| Hidden barn doors |
Modern interiors with concealed hardware |
Clean design with sliding functionality |
| Pocket doors |
Small rooms, bathrooms, closets |
Slides into the wall to save space |
| Bypass doors |
Closets and storage areas |
Two-panel sliding access |
| Bi-fold doors |
Closets, laundry rooms, pantries |
Compact folding opening |
| Double bifold doors |
Wide closet and utility openings |
Efficient access for wider spaces |
| Pivot doors |
Premium interiors and architectural spaces |
Statement design and modern movement |
Swinging and Sliding Interior Doors
Interior doors can be divided into two main opening types: swinging and sliding. Swinging doors are hinged and open into or out of a room. Sliding doors move along a track and are often used when the goal is to save space or create a modern interior with door systems that do not require swing clearance.
Swinging Interior Doors
Swinging interior doors are the most common choice for bedrooms, bathrooms, offices, and other everyday rooms. They are available as single or double doors and work well in both classic and modern home interiors.
Sliding Interior Doors
Sliding interior doors include barn doors, hidden barn doors, pocket doors, and bypass doors. They are often used for closets, pantries, laundry rooms, and compact spaces where a traditional swing door may take up too much room.
Interior Door Styles
The style of an interior door affects how the entire room feels. United Porte offers interior doors in several design directions, making it easier to match the door interior with the overall interior of a house.
- Modern interior doors — clean lines, smooth surfaces, minimalist panels, and contemporary finishes.
- Classic interior doors — traditional designs for timeless home interiors.
- French doors — elegant doors with glass panels for light flow and visual openness.
- Luxury interior doors — premium designs for upscale homes and architectural projects.
- Louvered doors — practical options for closets, laundry rooms, and spaces that need ventilation.
Colors, Materials, and Glass Options
Interior doors for homes should match both the room function and the design palette. United Porte offers multiple color, material, and glass options for different interior styles.
| Option |
Available Choices |
Recommended Use |
| Colors |
White, black, grey, brown, green, blue, yellow |
Neutral, modern, classic, or accent interiors |
| Materials |
MDF, laminate |
Stable, practical residential interior doors |
| Glass Types |
Frosted glass, clear glass, mirror |
Privacy, light flow, or visual expansion |
Where Interior Doors Are Used
Interior room doors are selected based on how the room is used. A bathroom door should provide privacy, a closet door should be compact and convenient, while an office door may need better noise control.
- Closet doors — bypass, bifold, barn, or mirror doors.
- Bathroom doors — solid or frosted glass options for privacy.
- Bedroom doors — swing, solid, or pre-hung interior doors.
- Laundry doors — bifold, louvered, or compact door systems.
- Pantry doors — barn, pocket, glass, or swing doors.
- Kitchen doors — glass, French, swing, or sliding doors.
- Office doors — solid, glass, or modern interior doors for workspaces.
Slab, Pre-Hung, Pre-Finished, and Painted Doors
Interior doors can be ordered in different configurations depending on the installation project. The right format depends on whether you are replacing an existing door or installing a complete new system.
| Feature |
What It Means |
Best For |
| Slab |
Door panel only, without frame or hinges |
Replacing an existing door |
| Pre-hung |
Door supplied with frame and hinges |
New construction or full replacement |
| Pre-finished |
Factory-finished surface |
Fast installation without extra finishing |
| Painted |
Finished painted surface |
Ready-to-install interior design projects |
Standard Interior Door Sizes
Interior doors for house and home projects are available in common residential sizes. In the United Porte catalog, interior doors commonly range from 18" × 80" to 42" × 96". The most common interior door thickness is 1 9/16".
- Common widths: 18", 24", 28", 30", 32", 36", 42"
- Common heights: 80", 84", 96"
- Common thickness: 1 9/16"
- Rough opening rule: add about 2" to the door width and 2" to the door height
How to Choose Interior Doors for a Home
To choose the right interior door for a house, start with the room location, then select the opening type, material, finish, size, and installation format. A bedroom may need a solid swing door, while a closet may work better with bifold or sliding doors.
- Choose the location: bedroom, bathroom, closet, pantry, kitchen, laundry, or office.
- Select the opening type: swinging, sliding, folding, pivot, hidden, or frameless.
- Match the style: modern, classic, French, luxury, or louvered.
- Choose the material: MDF or laminate depending on the design and budget.
- Decide on glass: frosted glass for privacy, clear glass for openness, mirror for visual expansion.
- Pick the installation format: slab, pre-hung, pre-finished, or painted.
Interior Door Delivery in the USA
United Porte offers delivery for interior doors across the United States. Delivery cost depends on the door type, item count, and destination state. For Manhattan, delivery is calculated using the "All others" pricing.
Warranty for United Porte Interior Doors
United Porte products are designed and built to high industry standards. Doors purchased after September 16, 2021 and installed in residential homes in the United States are warranted against manufacturing defects in material and workmanship for 2 years from the purchase date.
Why Buy Interior Doors from United Porte?
- Wide selection of interior doors for home and house projects
- Single, double, sliding, folding, hidden, barn, pocket, bypass, and pivot doors
- Modern, classic, French, luxury, and louvered styles
- White, black, grey, brown, green, blue, and yellow color options
- MDF and laminate materials
- Frosted glass, clear glass, and mirror options
- Slab, pre-hung, pre-finished, and painted configurations
- Delivery options across the USA
- Residential warranty protection
Find Interior Doors Near You
Looking for interior doors near me? Browse United Porte's interior door collection online and choose doors for bedrooms, bathrooms, closets, pantries, kitchens, laundry rooms, offices, and modern home interiors.
FAQ
What is average size of interior door?
Most interior doors fall into a fairly predictable range, but the “average” depends on the room type. In our catalog, common sizes start from 18" × 80" and go up to 42" × 96".
What is standard thickness of interior door?
The most common (standard) interior door thickness is 1 9/16".
That thickness works with most standard interior door frames, hinges, and locksets, and it’s the safest choice when you want compatibility without extra adjustments.
Should you paint interior doors before hanging them?
In most cases, no—because about 99% of our doors come already finished, and we don’t recommend painting them.
How many hinges does a standard interior door have?
- 80" and 84" doors typically use 2 hinges.
- 96" doors should have 3 hinges.
How to trim an interior door?
Most doors can be trimmed by about 1" from each side (top/bottom/edges depends on construction).
How to protect interior door from animal scratches?
For scratch protection (especially from dogs/cats), the most effective options are:
- Door scratch protector (best overall option)
- Kick plate (great for the lower third of the door)
- Plexiglass / acrylic panel (clear protection while keeping the look).
How to fill gap under interior door?
If you have a gap under an interior door (drafts, light, noise), these are the simplest fixes:
- Door sweep (best for small–medium gaps; improves draft and sound control)
- Adhesive draft stopper (fast, budget-friendly, and DIY)
How long should interior door hinge screws be?
A standard interior hinge often uses 3/4" screws, but for better support we recommend using 2" to 2.5" screws (especially for heavier doors).
How to make interior doors close quietly?
The fastest fix is adding soft-close door bumpers (rubber pads). They reduce the “click” and prevent slamming noise.
What is standard interior door rough opening dimensions?
A common rule for rough opening (RO) is: Add 2" to the door width and 2" to the door height.
What are standard interior door framing dimensions?
For framing/planning clearances, a typical approach is:
- Width: about 2" total (room for shims and jamb alignment)
- Height: about 1.5" total (to account for jamb, leveling, and flooring tolerance)
How to measure for interior door size?
If you’re ordering based on a door listed online, a simple approach is:
- Choose the door size shown on the website
- For the rough opening, add 2" (width) and 2" (height)
How to stop an interior door from swinging closed?
A clean, modern solution is a magnetic door stopper.
What are best paints for interior doors?
Any quality brand can work—the key is choosing the right type of paint and ensuring the exact color code matches what you want.
Do interior doors come with casing?
It depends on the door type/package. Some doors or equipment are designed to include casing, while others don’t.
What is the smallest interior door size?
The smallest common interior door size in our offering is 18" × 80".
What types of interior door materials in stock?
We carry:
- Solid wood options
- Honeycomb core with MDF (lightweight construction with stable surface)
What door types for interior are there?
Common interior door types include:
- Swing
- Barn
- Pocket
- Bifold
- Closet bypass
- Barn bypass
- Hidden (concealed / flush) doors
What is the best interior door finishes?
A premium option we use is a high-end film layer applied on top of laminated MDF, made in Italy.
Do interior doors need jack studs?
Yes—almost all properly framed interior doors require jack studs (also called trimmer studs).
Can i install interior doors myself?
Yes, installation is available.
Should i install interior doors before flooring?
It’s possible, but not recommended unless you have solid DIY experience and the right tools.
What is the interior doors cheapest price?
The most affordable options are typically from the Basic lines (for example, Basic 3001 and other Basic models).
