How Thick Is An Exterior Door

How thick is an exterior door is an essential factor impacting durability, efficiency, noise control, and security. This guide examines standard thickness dimensions and custom sizing options for exterior doors.

Door thickness varies by material and design, but 1-3/4 inches is typical. Custom sizing permits thicker, heavier doors for added insulation and strength. Consider your climate, safety needs, and noise concerns when determining the ideal entryway thickness. Learn more about how thick is an exterior door here.

1. Standard Thickness Of Exterior Doors


How thick is an exterior door? The most common thickness for exterior doors is 1-3/4 inches, regardless of material. This provides suitable structural integrity for single-family homes and residential buildings.

1-3/4 inches allows standard mortise locksets and deadbolts to fit correctly while offering ample security and durability. Homeowners need to maintain this well-established, versatile thickness.

Some fiberglass and steel doors are slightly thinner at 1-3/8 inches with more limited insulation. Depending on design and reinforcement, vinyl doors also fall into the 1-3/8 to 1-3/4 inch range.

Why Thickness Matters

Door thickness impacts energy efficiency, noise control, strength against forced entry, and structural integrity. Thicker exterior doors provide:

  • Better insulation

More space for dense foam insulation to prevent heat/cold transfer.

  • Noise reduction

Higher-density construction blocks unwanted external sounds.

  • Added durability

Increased resistance to impacts and wear over time.

  • Enhanced security

More thickness makes doors harder to break down.

Custom Thicker Exterior Doors

Wondering how to measure entry doors? Unique needs like energy efficiency, soundproofing, and security in risky areas warrant thicker custom doors. Popular options include

  • 2-1/4 inch doors 

Provide 25% more thickness than standard for increased insulation, strength, and noise control.

  • 2-1/2 inch doors 

It has the same benefits as 2-1/4 inches but even higher performance. Useful in extreme climates or high-noise areas.

  • 3-inch doors 

Maximum thickness for the ultimate in sturdiness, security, and sound blocking. Requires special jambs.

  • Thicker steel doors

Up to 2 inches thick for security. Stiffeners and composite edges offer more kick-in resistance.

The strongest, most soundproof, and thermally efficient doors utilize custom 2-1/2 or 3-inch thickness levels. It makes sense for homeowners to prioritize such performance capabilities.

Insulation Material Matters Too


In addition to overall thickness, the filling material impacts insulation and sound absorption. Polyurethane foam offers the highest efficiency and noise control. Less effective insulators like polystyrene or fiberglass compromise performance.

Also, ensure thick weatherstripping for airtight seals. An insulated door alone does not prevent energy transfer without air seals. Prioritize both thickness and high-grade insulation materials.

Weight Considerations

Increased thickness adds substantial door weight. Standard 1-3/4 inch doors can weigh over 200 pounds. Custom 2-1/4 inch doors approach 300 pounds. At 3 inches, exterior doors weigh up to 400 pounds.

The heavy weight makes DIY installation extremely difficult, if possible. Professional installers have the equipment to maneuver and hang heavier doors properly.

Reinforced jambs and graded fasteners are required to handle the load. The frame must distribute weight so the door remains square and operates smoothly.

Jamb Size Matters Too

Thicker doors need adequately sized jamb depths to fit correctly. Standard jambs only accept doors up to 1-3/4 inches. To accommodate thicker doors without milling down material, order special jambs.

For 2-1/4 inch doors, order 2-1/4 inch jambs to maintain the full thickness. Manufacturers customize jamb depths to match precisely.

Proper clearance between door edges and jambs is crucial for smooth operation. Avoid modifying ill-fitting jambs by getting the right coordinated jamb size.

Appearance Considerations

Increasing door thickness can disrupt the surrounding moldings, trim, and casings once proportioned to standard sizes. The changed depth alters the aesthetic if new trim work is not installed.

Thicker doors also have a distinct, solid, heavy appearance. Those wanting delicate or subtle entries may find overly thick doors overwhelming the facade.

For homes with carefully designed moldings, closely evaluate how thickness changes may disrupt architectural details before widening doorway dimensions.

Cost Considerations


Custom sizing inherently adds cost over standard pre-fabricated doors. The pricing multiplies with thickness – a 3-inch door costs exponentially more than a 1-3/4 inch version.

Labor also increases for delivering and installing heavier doors safely. However, added insulation can pay back through energy savings over time.