Introduction：Doors are more than just entryways—they shape how we move through spaces, affect energy use, and influence a building’s aesthetics. Understanding standard door dimensions is crucial for homeowners, contractors, architects, and DIY enthusiasts alike. This comprehensive guide explores average door sizes across various applications, helping you make informed decisions for your next project.
Based on extensive research from over 100 authoritative sources including building codes, industry standards, manufacturer specifications, and construction guidelines from both international and Chinese regulatory bodies, this guide provides the most accurate and up-to-date information on door sizing.
Article Overview
Standard Interior Door Sizes
Common Residential Dimensions：
Interior doors follow standardized sizing that accommodates most residential applications. The most common interior door size varies slightly by region:
- North American Standard:
Height: 80 inches (2032mm / 6’8″)
Width: 24, 28, 30, 32, and 36 inches (610mm, 711mm, 762mm, 813mm, 914mm)
Most common width: 32 inches (813mm) for bedrooms and hallways
Thickness: 1⅜ inches (35mm)
- We recommend:
Height: 2000-2100mm (78.7-82.7 inches), with 2050mm being common in newer constructions
Width: 600-900mm (23.6-35.4 inches)
Most common width: 800mm (31.5 inches)
Thickness: 35-40mm (1⅜ inches)
Room-Specific Door Sizes
Bedroom and hallway doors:
North America: 32 inches (813mm) wide
We recommend: 800mm (31.5 inches) wide
Bathroom doors:
North America: 28-30 inches (711-762mm) wide
We recommend: 700-750mm (27.6-29.5 inches) wide
Closet doors:
North America: 24-36 inches (610-914mm) depending on space
We recommend: As small as 600mm (23.6 inches)
Utility rooms: 30-36 inches (762-914mm) for appliance access
Double Interior Doors
Double doors for interior applications typically total:
North America: 60-72 inches (1524-1829mm) wide (two 30-36 inch doors)
We recommend: 1200-1500mm wide (two 600-750mm panels)
These work well for master bedrooms, dining rooms, home offices, and formal living spaces, though they’re less common in standard apartments and more prevalent in villas or high-end residences.
Standard Exterior Door Sizes
Main Entry Doors：
Exterior doors require thicker materials and stronger construction for security and weather resistance.
- North American Standard:
Height: 80 inches (2032mm / 6’8″)
Width: 36 inches (914mm) – most common for main entries
Alternative widths: 30 and 32 inches (762mm, 813mm) for secondary entrances
Thickness: 1¾ inches (44mm)
- We recommend:
Height: 2050mm (80.7 inches)
Width: 900mm (35.4 inches) – now the norm per GB/T 36447-2018
Alternative widths: 800mm or 850mm for secondary entrances
Thickness: 45-50mm (1¾ inches) for improved thermal and sound insulation
Patio and Sliding Doors
- North American sliding door sizes:
Width: 60, 72, or 96 inches (1524mm, 1829mm, 2438mm)
Height: 80 inches (2032mm) standard; 96 inches available
Panels: 2-panel or 3-panel configurations
- We recommend balcony/patio sliding doors:
Width: 1500mm, 1800mm, or 2400mm (59-94.5 inches)
Height: 2100mm (82.7 inches) standard
French-style double doors: 1500-1800mm total width
Specialized Door Sizes
Garage Doors：
- North American residential garage doors:
Single-car: 8-9 feet wide × 7 feet high (2438-2743mm × 2134mm)
Double-car: 16 feet wide × 7 feet high (4877mm × 2134mm)
Modern trend: Height increasing to 8 feet (2438mm) for taller vehicles
- We recommend residential garage doors:
Single-car: 2400-2700mm wide × 2100mm high (7.9-8.9 ft × 6.9 ft)
Double-car: 4800mm wide × 2100mm high
Modern trend: Heights of 2200-2400mm to accommodate SUVs and electric vehicles
Commercial and Accessibility Compliance
- ADA Requirements (North America):
Minimum clear width: 32 inches (813mm)
Recommended width: 36 inches (914mm) for comfortable passage
Threshold height: ½ inch maximum
- We recommend Accessibility Standards (GB 50763-2012):
Minimum clear opening width: 800mm for wheelchair access
Recommended width: 900mm
Healthcare facilities: 1000-1200mm wide doors for equipment access
Fire-Rated and Specialty Doors
Fire doors (We recommend – GB 12955-2008):
Single door width generally not exceeding 1000mm
Height not exceeding 2300mm
Multi-panel combinations available for larger openings
Soundproof doors:
Customizable based on acoustic requirements
Thicker construction affects hardware and installation requirements
International Door Size Standards
- European Standards (EN 13241)
Height: 1981mm, 2040mm (approximately 78-80 inches)
Width: 610mm, 686mm, 762mm, 838mm (approximately 24-33 inches)
Common residential: 762mm × 2040mm (30″ × 80″)
- Australian Standards (AS)
Internal doors: 2040mm × 820mm (80.3″ × 32.3″)
External doors: 2040mm × 920mm (80.3″ × 36.2″)
- Asian Standards
Japan: 800-900mm width, 2000-2100mm height
We recommend: 800-900mm standard width, 2000-2100mm standard height
India: 750-900mm width, 2000-2100mm height
Factors Affecting Door Size Selection
Building codes: Local regulations may mandate minimum sizes
We recommend Residential Design Code (GB 50096-2011) requires interior doors to be at least 800mm wide in new homes
IBC Section 1008 governs door openings in North America
- Traffic flow: High-traffic areas need wider doors
- Furniture moving: Consider largest furniture piece dimensions
- Accessibility: Wheelchair users need adequate clear openings
- Aesthetics: Proportion to room size and ceiling height
- Energy efficiency: Larger doors lose more heat; proper sealing essential
Common Technical Challenges
- Non-standard openings: Older homes may have irregular sizes
- Load-bearing walls: Structural considerations limit modifications
- Moisture exposure: Bathrooms require appropriate materials
- Sound transmission: Bedroom doors may need acoustic ratings
- Large door stability: Preventing sagging and deformation in oversized doors
Advantages of Standard Sizes
- Lower cost (mass production)
- Easier replacement
- Wider availability
- Simpler installation
- Built-in code compliance
Disadvantages of Standard Sizes
- Limited design options
- May not fit unique openings
- Accessibility limitations
- Aesthetic constraints
How to Measure for Door Replacement
Step-by-Step Guide
Measure width at top, middle, and bottom of frame (take smallest measurement)
Measure height on both sides (floor may be uneven)
Measure thickness of door and frame
Check squareness of existing frame
Note swing direction (left-hand or right-hand)
Account for flooring changes (tile vs. carpet affects height)
Verify rough opening size vs. finished opening
Measurement Tips
Always measure the existing door frame—not the door itself
Record all three width measurements and use the smallest
Check for obstacles like baseboards or trim
Verify wall thickness to match door jamb depth
Note hinge and handle clearance requirements
Cost Considerations
Door Type North American Price Range Chinese Price Range Notes
Interior hollow-core $50-200 ¥200-800 Budget-friendly
Interior solid-core $150-400 ¥600-1600 Better sound isolation
Exterior steel $200-500 ¥800-2000 Security focus
Exterior fiberglass $400-1500 ¥1600-6000 Energy efficient
Custom doors $500-5000+ ¥2000-20000+ Any size/style
Custom door considerations:
Add 20-50% to standard pricing
Delivery times: 4-8 weeks vs. immediate availability
Higher risk of measurement errors requiring costly corrections
Current Trends and Future Outlook
Emerging Standards
Taller doors: 96-inch (2438mm) doors gaining popularity globally
Higher ceilings: Chinese developments increasing from 2.8m to 3.0m+, pushing door heights to 2200-2400mm
Wider openings: 36-inch (914mm)/900mm becoming minimum for new construction
Universal design: Aging-in-place considerations driving accessibility features
Smart integration: Electronic locks, sensors, and automated systems
Sustainability Focus
Recyclable materials: Steel and fiberglass options
Engineered wood/bamboo: Reducing deforestation impact
Energy efficiency: Higher R-values and insulated cores for exterior doors
Local manufacturing: Reduced transportation footprint
Durability: Longer lifespan reduces replacement frequency
System Integration
Performance systems: Doors as part of integrated building envelope solutions
High-performance glazing: Low-E glass, multiple panes for thermal performance
Advanced sealing: Multi-point locking and weatherstripping systems
Key Takeaways
✓ North American standard interior doors: 80″ × 28-32″ (2032mm × 711-813mm)
✓ Chinese standard interior doors: 2050mm × 800mm
✓ North American standard exterior doors: 80″ × 36″ (2032mm × 914mm)
✓ Chinese standard exterior doors: 2050mm × 900mm
✓ ADA minimum (US): 32″ (813mm) clear opening
✓ Chinese accessibility minimum: 800mm clear opening
✓ Always measure the frame, not the door
✓ Custom sizes add 20-50% to cost and extend delivery time
✓ International standards vary significantly—verify before importing
✓ Check local building codes before purchasing
References and Sources
This guide synthesizes information from over 100 authoritative sources including:
Building Codes and Standards
International Building Code (IBC) – Section 1008 – Door Openings
International Residential Code (IRC) – Section R311 – Means of Egress
Americans with Disabilities Act (ADA) – Title III – Public Accommodations
GB/T 5824-2008 – Building Door and Window Opening Size Series (China)
GB 50096-2011 – Residential Design Code (China)
GB 50763-2012 – Code for Accessibility Design of Buildings (China)
GB/T 36447-2018 – Wooden Interior Doors (China)
BS EN 13241 – European Door Standards
Technical Resources
Window and Door Manufacturers Association (WDMA)
International Code Council (ICC)
National Association of Home Builders (NAHB)
China Academy of Building Research
China National Building Materials Testing Center
Industry Publications
Doors & Hardware Magazine
Construction Specifier
Building Design + Construction
Architectural Journal of China
Manufacturer Resources
Jeld-Wen Technical Documentation
Masonite Door Catalog
Therma-Tru Doors Installation Guides
TATA Door Technical Specifications (China)
Mantu Group Product Standards (China)
Dream Doors Manufacturing Standards (China)
International Standards Bodies
ISO/TC 162 – Doors, windows and curtain walling
CEN/TC 33 – Doors, windows, shutters, building hardware and curtain walling
Disclaimer: Door sizes and codes vary by location and are subject to change. Always verify with local building authorities before purchasing or installing doors. This guide provides general information based on current standards and should not replace professional consultation or site-specific engineering analysis.