Safety & Precautions
- Exterior doors must meet code requirements in most jurisdictions — minimum width of 32″ (36″ recommended for accessibility), proper fire ratings for doors between garage and living space, and energy efficiency standards in new construction.
- Fire-rated doors are required between an attached garage and living space in all US building codes — these must be solid-core steel or solid wood, not hollow-core.
- Verify door swing compliance: Egress doors (exterior entry/exit) must swing outward in commercial applications; in residential they typically swing inward.
Interior Door Types
1. Hinged (Swing) Doors — Most Common
The classic door type — mounted on side hinges, swings in or out. Available in hollow-core (lightweight, less sound control, ~$50–$150) or solid-core (heavier, better sound control, ~$150–$400). Best for: bedrooms, bathrooms, offices — any room where privacy and sound control matter. The standard choice when you have adequate floor clearance for the door swing arc.
2. Pocket Doors — Space Saving
Pocket doors slide into a cavity in the wall, disappearing completely when open. Excellent for tight spaces where a swinging door would be impractical — small bathrooms, between kitchen and dining room, closets adjacent to hallways. Cost: $200–$800+ for the door and hardware kit, plus installation labor. Requires wall framing modification if adding to an existing wall. See our pocket door installation guide for the complete process.
3. Barn Doors — Sliding Wall-Mounted
Barn doors hang from a top-mounted track and slide along the wall face — they don’t require wall framing modification because they don’t go inside the wall. Extremely popular in farmhouse, modern rustic, and contemporary homes. Best where wall space is available on one side of the opening. Note: they don’t seal as tightly as hinged doors — not ideal for soundproofing or privacy-critical applications. Cost: $150–$600 for door + hardware. See our barn door ideas guide for hardware and installation options.
4. Bifold Doors — Closet Favorite
Bifold doors fold in half along a top track — two panels each hinged together in the center. Standard for closet openings, laundry room doors, and pantry access. They require less clearance than a full swing door but don’t disappear like pocket doors. Cost: $80–$300 for standard closet bifold sets. See our bifold door installation guide for setup instructions.
5. French Doors — Interior Room Dividers
Paired doors with glass panels that open from the center — either hinged or sliding. Used to divide living rooms from dining rooms, offices from hallways, or master bedrooms from sitting areas. They allow light transfer between spaces while maintaining some acoustic separation. Best where visual connection between spaces is desired. Cost: $300–$1,500+ for the pair.
6. Flush Doors — Clean and Modern
Flat-faced doors with no raised panels or decorative detail. Available in hollow-core and solid-core. The standard choice for modern, minimalist, and contemporary interiors. Extremely versatile — can be painted any color or left natural. Less expensive than paneled doors of equivalent quality. Cost: $60–$250.
7. Panel Doors — Traditional Standard
Feature raised or recessed rectangular panels on the face. The 6-panel door is the most common traditional interior door style in American homes. Available in 2-panel, 4-panel, 6-panel, and other configurations. Pairs well with colonial, traditional, and transitional interior styles. Cost: $80–$400.
8. Dutch Doors — Charming and Functional
Split horizontally — top half opens independently. Popular in nurseries, laundry rooms, and kitchen entries. Allows ventilation and light while keeping pets or small children in an area. More expensive than standard hinged doors: $400–$1,200.
Exterior Door Types
1. Single Entry Door — Standard
The most common exterior door — one door panel in a single opening. Available in steel, fiberglass, or wood. Typical width 32″–36″, height 80″–96″. The workhorse of entry doors for most single-family homes. For choosing and installing one, see our door replacement guide.
2. Double Entry Doors
Two door panels in a wider opening — typically 60″–72″ total width. Creates a grand, formal entry — common in large traditional and colonial homes, or any home with a wide entryway. More expensive to purchase and install; requires wider rough opening. Cost: $800–$4,000+.
3. Sliding Patio Doors
One fixed panel and one sliding panel — the sliding panel glides on a track. Very common for rear entries to patios and decks. Available in aluminum, vinyl, and wood-clad. Excellent for maximizing view and natural light. Primary weakness: older sliding doors can be lifted off their tracks from outside — ensure any sliding door has a proper anti-lift mechanism. Cost: $800–$3,000+. See our sliding and French door guide.
4. French Patio Doors
Two hinged panels that open from the center to a patio or deck. More traditional aesthetic than sliding doors and better air seal. Require clearance for both panels to swing. Popular in colonial and traditional homes. Cost: $1,000–$4,000+.
5. Storm Doors
Installed in front of the main entry door — adds weather protection, security, and energy efficiency. Full-view (mostly glass) or partial-view options. Extends the life of the main door’s finish significantly. Cost: $150–$600. See our storm door installation guide.
6. Screen Doors
Allow ventilation while keeping insects out. Traditional hinged screen doors or retractable screens. Common on back doors and porches. Cost: $50–$300. See our screen door installation guide.
Door Type Selection Guide: Which to Choose?
| Room / Use | Best Door Type | Why |
|---|---|---|
| Bedroom | Solid-core hinged door | Best sound control and privacy |
| Bathroom | Hinged (inswing) or pocket | Privacy; pocket saves space in tight baths |
| Closet | Bifold or sliding bypass | No swing arc needed; full access to closet width |
| Home office | Solid-core hinged or French | Solid-core for sound control; French for visual connection |
| Living/dining divider | French doors or pocket | Light transfer + ability to fully open the space |
| Laundry room | Bifold, pocket, or Dutch | Space-saving; Dutch allows venting while keeping pets out |
| Front entry | Steel or fiberglass prehung | Best security + insulation combination |
| Back/patio entry | Sliding or French patio | View, light, and access to outdoor living |
| Garage to house | Solid-core fire-rated steel | Code-required fire rating; security |
Interior Door Materials: Hollow-Core vs. Solid-Core
| Factor | Hollow-Core | Solid-Core |
|---|---|---|
| Weight | 25–35 lbs | 50–100 lbs |
| Sound control | Poor | Good (not as good as solid wood) |
| Feel/quality | Lightweight, sounds hollow when knocked | Solid feel, quality sound |
| Cost | $50–$150 | $150–$400+ |
| Best for | Closets, pantry, low-traffic areas | Bedrooms, bathrooms, offices |
| Durability | Dents and damages easily | Much more impact-resistant |
Pro Tips for Choosing Door Types
- Measure rough opening before buying: Standard interior rough openings are 2″ wider and 2″ taller than the door — a 30″ door needs a 32″ rough opening.
- Consider the opening direction carefully: A door that opens into a narrow hallway or small bathroom creates a daily inconvenience that most people don’t think about until it’s installed. Pocket doors or bifolds solve this problem in tight spaces.
- Upgrade to solid-core in key rooms: Bedroom and bathroom privacy is dramatically improved by solid-core doors. The cost difference ($50–$100 per door) is one of the best value upgrades in interior renovation.
- Match door profiles throughout the house: Mixing 6-panel traditional doors with modern flush doors in the same open-plan home creates visual inconsistency. Choose one style and stick with it throughout connected spaces.
Frequently Asked Questions
What is the most common interior door style?
The 6-panel hollow-core door is the most common interior door style in American homes built between 1980 and 2010. Newer construction increasingly uses flush (flat) doors in modern and contemporary homes. Shaker-style doors (simple recessed single panel with clean lines) are currently the most popular choice for renovation projects.
What’s the difference between hollow-core and solid-core doors?
Hollow-core doors have a cardboard honeycomb or wood-grid interior — they’re lightweight and inexpensive but provide poor sound control and damage easily. Solid-core doors have a dense composite or wood interior — heavier, more durable, and significantly better for sound control. Solid wood doors are made of actual wood throughout, providing the best feel and acoustic performance but at highest cost.
What size are standard interior doors?
Standard interior door heights are 80″ (6’8″) and 84″ (7′) for newer construction. Standard widths are 24″, 28″, 30″, 32″, and 36″. The 32″ width is most common for bedroom and bathroom doors; 36″ is recommended for accessibility (wheelchair clearance). Closets typically use 24″–30″ per panel.
Do I need a permit to replace interior doors?
Replacing a door in its existing opening in the same size does not require a permit in most US jurisdictions. Expanding an opening, changing the rough opening size, or adding a new door where none existed may require a permit. Always check local building department requirements before structural modifications.
Conclusion
The right door type improves both the function and feel of any room. Start with the space requirement — if swing clearance is tight, go pocket or bifold. If privacy and sound matter, choose solid-core hinged. If it’s an exterior entry, prioritize steel or fiberglass for security and insulation. Then layer in style to match your home’s interior design language.
Related guides: how to replace a door, barn door ideas and installation, bifold door installation, and pocket door installation.
