Essential Factors to Consider When Ordering Doors for Your Home

Key Measurements for Ordering Doors

Before placing any door order, accurate measurements are essential. A mistake of even a quarter-inch can lead to costly delays, return fees, and construction schedule disruptions. Whether you are building new or replacing existing units, understanding the relationship between door installation requirements and rough opening dimensions is the foundation of a successful project. The standard exterior door width in residential construction is 36 inches, while interior doors typically range from 28 to 32 inches. Height usually measures 80 inches for standard doors, although new construction increasingly uses 96-inch doors for a more modern, taller appearance that improves natural light transmittance through sidelights and transoms.

Measuring the Rough Opening

The rough opening is the framed hole in the wall where the door unit will sit. For prehung doors, the rough opening must be about 2 inches wider and 2 inches taller than the actual door slab. For example, a 36-inch-wide door requires a rough opening of approximately 38 inches wide. This extra space allows for the jamb assembly and shimming adjustments during installation.

When measuring, take three width measurements across the rough opening at top, middle, and bottom. Also take three height measurements from the subfloor or finished floor reference to the header at left, center, and right. Use the smallest measurement as your baseline. Walls that appear square often reveal surprising variations once measured, especially in older homes where framing has settled over time.

Pay special attention to the floor condition. If the subfloor slopes or the finished floor height has not been finalized, account for this in your measurements. Doors installed before the final flooring is laid need adequate clearance to avoid scraping later. Installing prehung doors on uneven floors requires specific adjustment techniques

Door Swing and Handing

Door handing determines which side the hinges are on and which direction the door swings. To determine handing, stand outside the doorway or on the side the door swings toward and note which hand would turn the knob. A right-hand door has the hinges on the right when viewed from the exterior; a left-hand door has hinges on the left. Inswing versus outswing is equally critical for exterior doors, as it affects weather exposure and security hardware placement.

For exterior doors, local building codes may dictate the required swing direction based on egress requirements. In many jurisdictions, doors leading to the exterior must swing outward in basements and certain habitable spaces. Always verify local code requirements before placing your order.

Door Types and Construction Materials

The material you choose affects durability, thermal performance, maintenance requirements, and overall cost. Each material offers distinct trade-offs for different applications, and understanding these differences helps you select the right product for each location in the home.

Solid Wood Doors

Solid wood remains the traditional choice for both interior and exterior doors. Oak, mahogany, cherry, and fir are common species, each offering distinct grain patterns and dimensional stability. Solid wood doors can be trimmed to fit minor rough opening variations, making them a flexible option for retrofit projects. However, they require periodic refinishing and can warp in high-moisture environments if not properly sealed. The weight of a solid wood door also requires heavy-duty hinges and careful framing support, particularly for wide single doors or double-door assemblies.

Steel Doors

Steel entry doors offer superior security and energy efficiency at a moderate price point. The steel skin is typically galvanized and factory-primed, with a polyurethane foam core providing the insulation value. Steel doors resist warping and are difficult to force open, making them a popular choice for main entry points. The main drawback is denting. A hard impact from tools, furniture, or yard equipment can leave permanent damage, and rust can develop if the paint layer is compromised. In coastal climates, steel doors require vigilant maintenance and are often replaced with fiberglass for better corrosion resistance.

Fiberglass Doors

Fiberglass doors replicate the appearance of natural wood grain while offering superior weather resistance. The fiberglass skin does not rust, dent, or rot, making it the preferred choice for coastal and high-humidity regions. Many fiberglass doors achieve R-7 insulation values when foam-filled. They also hold paint and stain exceptionally well, though they cannot be trimmed more than about 1/8 inch without damaging the skin. This limitation means the rough opening must be accurately framed to avoid having to order a custom-sized unit.

Specialty Door Types

French doors, sliding patio doors, and multi-slide units require additional considerations during ordering. French doors need accurate measurement of both leaf sizes and verification that the framing header can support the additional weight. Sliding doors require precise track measurements and confirmation that the exterior grade allows proper drainage at the sill. Multi-slide or folding door systems have the longest lead times, often 8 to 16 weeks, and require the most detailed coordination between the supplier and the general contractor.

Hardware and Prehung Configurations

Doors arrive either as slabs or prehung units. The choice between them affects installation complexity, labor cost, and the overall quality of the finished product.

Prehung vs. Slab Doors

• Prehung doors come with the jambs, hinges, and latch bore already assembled. Installation involves placing the unit into the rough opening, shimming, and fastening. This is the preferred option for most builders and homeowners because it ensures proper alignment and saves significant labor time. Most prehung units also include the threshold for exterior doors, which must be correctly sized to match the jamb width. Professional installation techniques for prehung exterior doors emphasize precise shimming at hinge and strike locations to prevent binding and ensure smooth operation.
• Slab doors are just the door panel without jambs or hardware prep. You must cut hinge mortises, bore for the lockset, and fit the door to the existing jamb. Slab doors are best when the existing jamb is in excellent condition or when you need a non-standard size that matches an existing opening. They require a higher skill level and more time to install correctly, but they offer greater flexibility for historic renovations and custom applications.

Hardware Selection Checklist

Hardware must be selected before the door is ordered if you want factory prep. Field-boring hardware after delivery adds labor and risk of error.

1. Determine the backset distance (standard is 2-3/8 inches for interior, 2-3/4 inches for exterior)
2. Choose between cylindrical, tubular, or mortise lock mechanisms
3. Select hinge type and finish to match the lockset
4. Verify that the door thickness matches the latch and strike requirements
5. For exterior doors, confirm ANSI Grade 1 or 2 security rating
6. Check whether the jamb material accepts standard screw lengths for strike plates and hinge screws
7. Decide on deadbolt inclusion and specify bore size (standard 2-1/8 inch diameter)

Jamb Details and Extensions

Jambs are often overlooked when ordering doors, but jamb width is critical. Measure the total wall thickness including drywall, sheathing, and siding for exterior doors. Standard interior jambs are 4-9/16 inches for 2×4 walls with 1/2-inch drywall on both sides. For 2×6 walls, 6-9/16-inch jambs are required. Custom jamb widths are available from most manufacturers but may add lead time and cost.

If the rough opening depth does not match a standard jamb size, jamb extensions can be field-installed after the door is hung. However, ordering the correct jamb width from the factory produces a cleaner appearance and reduces on-site carpentry. Proper hinge mortising techniques become especially important when working with thick jambs or retrofit installations where the existing framing has shifted over time.

Scheduling, Lead Times, and Order Verification

Door orders require careful coordination with the overall construction schedule. Lead times vary significantly by product type, manufacturer, and level of customization.

Typical Lead Times by Door Type

• Stock doors (standard sizes, common materials): 1 to 3 days in warehouse, same-day pickup available at lumberyards
• Semi-custom doors (standard sizes with custom finishes or glass options): 2 to 4 weeks from order date
• Custom doors (non-standard sizes, specialty wood species, custom glass, unique panel layouts): 6 to 12 weeks or more
• Multi-slide and folding door systems: 8 to 16 weeks, often requiring a site visit from the manufacturer’s representative

Order exterior doors as early as possible in the project timeline. A delayed door can hold up exterior sheathing, trim work, and interior finishing in the entry area. For custom sizes, place the order immediately after the rough framing is complete and the rough opening dimensions have been verified in the field.

Verifying Your Order Upon Delivery

When the door arrives, inspect it before accepting delivery. Damage discovered after the delivery driver leaves becomes your responsibility and can lead to lengthy warranty claim processes.

1. Confirm the slab dimensions match the purchase order to within 1/16 inch
2. Verify the handing matches the rough opening orientation
3. Examine the door face for scratches, dents, or finish imperfections under good lighting
4. For prehung units, check that the jamb is square and free of twist or bow
5. Confirm that all hardware components are present and match the specification
6. Check glass panels for cracks, scratches, or seal failure (argons gas loss can create fogging)
7. Verify weatherstripping is continuous and properly seated in the kerf

Storage and Site Protection

Proper storage prevents damage between delivery and installation. Store doors flat on a clean, level surface in a dry, climate-controlled space. Lean them only temporarily while moving. A door stored on edge for several days can develop a permanent bow that makes proper fit impossible. Protect the door from direct sunlight, which can cause uneven heating and warping, especially in dark-colored fiberglass or steel units.

Keep the door in its factory packaging until installation. If the packaging is removed for inspection, rewrap the door with breathable material. Plastic wrap can trap moisture against the door surface and cause finish blistering or mold growth. Preventing door jamb rot and moisture damage begins with proper storage and site-protection practices during the rough construction phase.

Avoiding Common Ordering Mistakes

Several recurring errors cause delays, expense, and frustration in door ordering:

• Assuming all 36-inch doors measure exactly 36 inches (actual slab width is typically 35-7/8 inches for standard units)
• Ordering doors before the subfloor thickness is finalized, resulting in threshold clearance problems
• Neglecting to account for finished floor coverings such as tile mortar bed, hardwood underlayment, or carpet pad when measuring threshold clearance
• Forgetting to specify bore preparation for the desired lockset type, requiring field modification
• Ordering based on architectural plans without field-verifying rough openings after framing is complete
• Choosing a door material that is incompatible with the local climate, such as steel in coastal salt air environments

Careful planning and clear communication with the door supplier prevent most of these issues. When in doubt, order a prehung unit with a complete casing package that matches the architectural style of the home. This approach ensures that the jamb, door, casing, and hardware work together as an integrated system rather than a collection of parts that require extensive field modification. Taking the time to verify every dimension and specification before placing the order saves far more time than any shortcut could deliver.