Open cleanly.
Right garage door size, headroom, and opener power for any garage. Checks clearances and recommends single vs double door.
How we calculated this
Standard garage door widths: 8 or 9 ft for single-car openings, 16 ft for standard double, 18 ft for extra-wide double (for modern large SUVs and trucks), 20 ft+ for RV or commercial bays. Standard heights: 7 ft (standard for passenger cars and most small SUVs), 8 ft (full-size pickups and RVs with top carriers), 9-10 ft (RVs, small commercial, workshop access for trucks with racks).
Headroom is the critical dimension most homeowners overlook. A standard sectional garage door needs 12 inches of clearance between the top of the opening and the ceiling for the tracks to curve back. Less than 12 inches requires a low-headroom conversion kit (adds $100-200 to door cost) that works down to about 4.5 inches. Below 4.5 inches: sectional doors won't fit; consider side-folding or roll-up options.
Side room is the horizontal clearance between each side of the opening and the nearest wall. Standard installations need 3.75 inches each side for the vertical tracks and track brackets. Torsion spring systems may need 8+ inches on one side for the spring. Tight side room is workable but may limit spring choices.
Opener sizing depends on door weight: a non-insulated steel door is lightweight (~120-180 lbs for a 16×7 door), insulated steel is medium (150-250 lbs), aluminum-and-glass doors vary (180-350 lbs), wood doors are heaviest (300-600+ lbs). For doors under 150 lbs: 1/2 HP opener. For 150-250 lbs: 3/4 HP. For 250+ lbs: 1 HP or DC chain drive. Overdrive openers (1.25+ HP) extend lifespan for any heavy door.
Material cost ranges (installed for a 16×7 ft double door, 2025-2026 US): basic steel $400-900; insulated steel $700-1,800 (most popular); aluminum with glass panels $1,500-3,500 (modern look, premium); wood $2,000-6,000 (custom staining, high maintenance). Prices scale roughly linearly with door width.
Not included: springs, tracks, hinges, cables (standard with new door), remote openers (add $150-400 for smart openers with WiFi), insulation upgrades, weatherstripping at the bottom, decorative hardware. Installation labor typically adds $200-500 for a single door, $400-800 for a double.
Sources
- DASMA — Door & Access Systems Manufacturers Association — Industry standards for garage door specs and sizing
- IRC 2021 — Garage Openings — Code requirements for garage door headers and openings
Frequently asked
What size garage door do I need?
Single-car garage: 8 or 9 ft wide × 7 ft tall. Standard double-car: 16 × 7 ft (fits two compact cars or one large SUV). Wide double: 18 × 7 ft (for two full-size vehicles with side mirrors). Tall double: 16 × 8 ft (for large SUVs, trucks with top carriers). Measure your opening from frame to frame — never trust what the builder 'says' the size is.
Can I install a garage door with low ceilings?
Yes, with a low-headroom conversion kit. Standard sectional doors need 12 inches of headroom; low-headroom kits work with as little as 4.5 inches. The kit adds $100-200 to door cost. Below 4.5 inches of headroom, consider side-folding or roll-up doors as alternatives.
Should I get an insulated door?
For attached garages or workshops: yes. Insulated doors reduce heat loss through the largest opening in the garage by 50-70%. Adds $200-600 to door cost. Cheaper to insulate the door than to insulate the garage separately. For detached unheated garages: non-insulated is fine.
What size opener do I need?
1/2 HP handles most 16×7 sectional steel doors up to 300 lbs. 3/4 HP for heavier insulated steel or light wood doors (300-500 lbs). 1 HP+ for heavy wood, glass/aluminum, or any door over 500 lbs. Belt drive is quieter than chain (important for rooms above garages). Direct drive (Liftmaster, Chamberlain) is most reliable.
How much does a new garage door cost?
Basic steel: $400-900 installed for a 16×7 double. Insulated steel (most popular): $700-1,800. Aluminum and glass modern: $1,500-3,500. Wood custom: $2,000-6,000. Single-car doors run about 60-70% of double-car prices. Opener adds $200-500 (basic) to $400-800 (smart with camera).
How long do garage doors last?
Steel: 15-30 years with minimal maintenance. Wood: 15-20 years with regular staining/sealing every 2-3 years. Aluminum: 20-25 years. Springs wear out in 10,000-20,000 cycles (7-10 years typical, 5 years for heavy-use homes). Openers last 10-15 years. Most garage door 'failures' are spring or track problems, not the door itself.
Can I replace just the panels?
Yes for sectional doors if you can match the style and color. New panels cost $100-300 each installed. Sometimes makes sense for a single damaged panel. For widespread damage or to change style: full replacement is more cost-effective than replacing 3+ panels.
What about the header above the door?
Garage door headers are critical structural components. For 16-ft openings: typically a doubled LVL (2-ply 14-18" deep) or engineered beam. For 18-ft+ openings: tripled LVL or steel beam. Always spec by IRC span tables or engineered drawings — garage door headers are load-bearing and undersized headers cause roof sagging.