ultimate-guide
Contractor Guide to Sourcing Interior Doors
Table of Contents
- Understanding Interior Door Types and Construction
- Standard Interior Door Rough Opening Dimensions
- How to Measure for Interior Door Replacement
- Interior Door Lead Time Management and Procurement
- Hardware, Hinging, and Code Compliance
- Sourcing Interior Doors Efficiently
- Conclusion
Last Updated: August 30, 2026
Understanding Interior Door Types and Construction
Interior door choice hinges on the structural foundation: solid core versus hollow core. This distinction determines durability, sound control, and long-term performance. Most contractors who source interior doors efficiently have this framework locked down before contacting suppliers.
Solid Core vs. Hollow Core Doors for Contractors
Solid core doors use a dense composite or wood fiber core sandwiched between veneer layers and stiles and rails. They deliver superior sound transmission class (STC) ratings of 30 to 45, resist warping, provide better hinge support, and hold up to decades of repeated use.
Hollow core doors use honeycomb or lattice interiors, making them lighter and more affordable. They're adequate for bedrooms and closets but lack rigidity and longevity. The thin veneer dents or cracks under job site conditions.
Solid core doors cost 40-60% more but handle contractor handling better and perform reliably in high-traffic areas, bathrooms, and spaces with moisture exposure (peer-reviewed research).
Panel Styles and Veneer Options
Panel configuration, the number and arrangement of raised or flat sections, affects aesthetics and structural integrity. Common configurations include 2-panel, 4-panel, 6-panel, and flat panel styles.
Veneer selection determines appearance and moisture response. Real wood veneers offer authentic grain but require careful handling. Prefinished veneers (maple, oak, birch) simplify logistics since you can hang them immediately without staining or sealing. MDF veneers are stable and affordable but show edge grain if damaged.
For contractors managing multiple projects, prefinished options reduce on-site variables and avoid finishing delays. Arizona Door Store carries prefinished options that move from delivery to installation without additional prep work.
Standard Interior Door Rough Opening Dimensions
Rough opening dimensions are the framed opening size before installation. Standard rough openings follow predictable patterns, though variations exist based on wall construction.
Standard rough opening width for a 32-inch door is 34.5 inches, accounting for the jamb width (typically 4.5 inches for standard 2x4 framing), shims, and installation tolerance. A 36-inch door requires a 38.5-inch rough opening.
Standard rough opening height for 80-inch doors is 82.5 to 83 inches, measured from finished floor to the top of the rough opening.
Measure rough openings at three points: top, middle, and bottom. Uneven walls and floors create variations that a single measurement misses.
Pre-Hung vs. Slab Doors
A pre-hung door arrives as a complete unit with the door slab mounted in the jamb frame, hinges installed, and door stop attached. It's ready to set into the rough opening, shim, and secure. Factory-installed hinges are aligned precisely, reducing on-site variables.
A slab door is the door panel alone, with no frame or hardware. You source the jamb separately and assemble on site. Slab doors offer flexibility when reusing existing jambs or when non-standard configurations are required. They're lighter to transport and easier to maneuver in tight spaces.
For most residential projects, pre-hung doors reduce labor time and installation risk. Slab doors make sense when working around existing jambs or when custom configurations require field assembly.
Lead time differs significantly. Pre-hung doors typically have longer lead times due to factory assembly, while slab doors often ship faster. Clarify lead time expectations when sourcing interior doors.
How to Measure for Interior Door Replacement
Accurate measurement is the foundation of successful door sourcing. Start by measuring the existing rough opening at three heights: top, middle, and bottom. Record width at each point. Repeat for height measurements at left, center, and right. Variations exceeding half an inch indicate out-of-plumb or uneven conditions affecting installation.
Measure from finished floor to the underside of the header to determine whether you need a standard 80-inch door or custom height. Measure jamb width to confirm whether your new door fits without requiring shims on all sides.
Check for existing door casing. If replacing a door while keeping existing casing, measure from the inside edge of the casing on both sides. If casing is being replaced, you have more flexibility in rough opening tolerance.
Record floor conditions carefully. Uneven floors affect threshold installation and door swing. If the floor slopes more than a quarter inch over the door width, plan for shim placement and potentially adjust the door stop height during installation.
Handling Uneven Floors and Out-of-Plumb Walls
Out-of-plumb walls and uneven floors are standard in renovation work. Account for these conditions during the sourcing phase rather than fighting them during installation.
When walls are out of plumb, the jamb needs shimming to achieve level and plumb. Shims are thin wedges inserted between jamb and rough opening to correct alignment. Plan for adequate shim space when ordering pre-hung doors.
Uneven floors require threshold selection that accommodates the slope. If the floor drops a quarter inch or more across the opening, a sloped threshold or adjustable-height threshold becomes necessary. Some suppliers offer adjustable thresholds that compensate for minor floor irregularities without additional shimming.
For severe out-of-plumb conditions (more than three-quarters of an inch), consider a slab door. This allows you to fit the jamb precisely to the opening, then install the door once everything is level and plumb.
Document these conditions when sourcing interior doors. Arizona Door Store's team can recommend door styles and hardware configurations that perform better in non-standard conditions based on your specific measurements.
Interior Door Lead Time Management and Procurement
Lead time, the interval between placing an order and receiving doors on site, prevents project delays. Lead times typically range from 2 to 6 weeks depending on whether you're ordering stock items or custom configurations.
Stock doors usually ship within 2 to 3 weeks. Custom doors with special veneer selections, panel configurations, or hardware finishes typically require 4 to 6 weeks or longer.
Plan your sourcing timeline around your project schedule. If starting a renovation in 8 weeks, place door orders in week 2 or 3 to ensure delivery before framing is complete. Doors should arrive after rough framing but before interior finishing begins.
Communicate project-specific lead time requirements to your supplier when placing orders. Some suppliers offer expedited shipping for a premium, worthwhile if it prevents crew downtime.
Build buffer time into procurement schedules. A one-week delay cascades through the entire project timeline. A two-week buffer is standard practice for residential projects.
Track orders systematically using a spreadsheet or project management system showing order date, expected delivery, and actual delivery. This data helps identify supplier patterns and adjust future lead time estimates.
Hardware, Hinging, and Code Compliance
Hardware selection, hinges, locksets, and door closers, affects functionality and code compliance. Specify hardware matching the door type and project requirements.
Fire Ratings and Sound Transmission Class
Fire-rated doors are required by building codes in specific locations. The International Building Code (IBC) mandates fire-rated doors between garage and living space, in certain wall assemblies, and in multi-family residential buildings (iccsafe.org). Fire ratings (20-minute, 45-minute, 60-minute, 90-minute) indicate how long the door assembly resists fire spread.
Sound transmission class (STC) measures how effectively a door blocks sound. Higher STC ratings indicate better isolation. Solid core doors typically achieve STC 30 to 35. High-performance doors with acoustic seals can reach STC 45 or higher. Bathrooms and bedrooms benefit from higher STC ratings, especially in multi-family projects.
Confirm code requirements with the building department or architect before ordering. Using a standard door where a fire-rated door is required creates liability and delays completion.
Hardware Finishes and Hinge Specifications
Hinge finish should match door hardware aesthetics. Common finishes include satin nickel, oil-rubbed bronze, polished brass, and matte black.
Hinge specifications depend on door weight and swing frequency. Standard residential interior doors use 3-inch hinges. Heavy solid core doors or high-traffic doors may require heavier-duty hinges or three hinges instead of two.
Hinge backset (distance from door edge to hinge pin center) is typically 1.375 inches for standard residential doors. Confirm backset matches project requirements when sourcing interior doors with pre-installed hinges.
Mortise depth (recessed area where hinge sits) is typically 0.5 inches. Factory-installed hinges on pre-hung doors have mortises cut to specification, reducing on-site work.
Sourcing Interior Doors Efficiently
Efficient sourcing reduces project costs and timeline risks. Start by creating a door schedule listing every door with location, size, style, finish, hardware, and special requirements. Include rough opening dimensions and existing condition notes.
Organize this information before contacting suppliers. Provide the door schedule, site measurements, and special requirements in writing. This clarity speeds quoting and reduces communication delays.
Building a Reliable Supply Partnership
Establish a consistent relationship with one or two door suppliers. A reliable supplier learns your standard specifications, understands project timelines, and communicates proactively about lead time changes.
Look for suppliers offering will call service, the ability to pick up doors locally rather than waiting for delivery. Will call reduces shipping delays and gives you control over arrival timing. Arizona Door Store offers fast will call service at convenient locations, eliminating delivery uncertainty.
Communicate typical project requirements to your supplier. If you regularly specify certain door styles, finishes, or hardware, your supplier can anticipate needs and maintain matching inventory, reducing lead time on repeat orders.
Ask about volume discounts for multiple projects. Many suppliers offer pricing breaks for consistent sourcing, improving project margins and competitiveness.
Troubleshooting Common Installation Failures
Installation problems often originate during sourcing. Specifying the wrong door type, incorrect dimensions, or incompatible hardware cascades into delays and rework.
Binding during swing results from out-of-plumb jambs or doors ordered for wrong rough opening sizes. The installer must plane stiles and rails, risking veneer damage. This is preventable through accurate measurement.
Hinge failure occurs when hinges are undersized for door weight or installed in soft wood. Solid core doors require heavier-duty hinges than hollow core doors.
Threshold gaps and water infiltration happen when thresholds aren't properly seated or floors are too uneven. For bathrooms and kitchens, threshold selection during sourcing prevents water damage.
Door stop separation occurs when the door stop pulls away from the jamb, typically from improper shimming. Confirm installers understand shimming requirements before work begins.
Hardware compatibility issues arise when locksets or closers are incompatible with door thickness or jamb width. Confirm all hardware compatibility when sourcing interior doors.
Document installation problems and causes. If you consistently encounter the same issue, adjust your sourcing process.
According to the International Building Code standards, fire-rated doors must be installed according to manufacturer specifications and building code requirements.
Sourcing interior doors effectively requires understanding construction types, measuring accurately, managing lead time strategically, and partnering with suppliers who understand contractor workflows. The difference between smooth installation and problems often comes down to sourcing decisions made before doors arrive on site.
Arizona Door Store brings local expertise and reliable service to every door project. Our team helps contractors specify correctly, manage lead times predictably, and access doors that perform reliably in local conditions. With convenient will call service and expert guidance on fire ratings and out-of-plumb walls, we reduce sourcing complexity and keep projects on schedule. Contact Arizona Door Store to discuss your project requirements and get doors sourced right the first time.
Frequently Asked Questions
What is the difference between solid core and hollow core interior doors?
Solid core doors feature a dense wood or composite core throughout, offering superior sound dampening, durability, and fire resistance. They're ideal for high-traffic areas and projects requiring fire-rated doors. Hollow core doors contain a honeycomb or lattice core, making them lighter and more affordable, suitable for budget-conscious projects where sound control isn't critical. Contractors typically choose solid core for premium residential work and hollow core for standard applications where cost matters.
How do I determine the correct door handing for a project?
Door handing refers to which side the hinges are mounted on when viewed from the opening. Stand outside the room looking into it: if hinges are on your right, it's right-handed; if on your left, it's left-handed. Specify this clearly when sourcing doors, as it affects frame orientation and hardware placement. Some suppliers offer reversible frames, but confirming handing upfront prevents costly installation errors and returns.
What are standard interior door rough opening dimensions?
Standard 32-inch single doors require a rough opening of approximately 34.5 inches wide by 82.5 inches tall for residential projects. Double doors (60-inch combined width) need about 62.5 inches wide by 82.5 inches tall. These dimensions account for shims, shimming tolerance, and door frame thickness. Always verify actual measurements on-site before ordering, especially in older homes or renovations where openings may be non-standard. Rough opening dimensions directly affect whether you need pre-hung or slab doors.
How can contractors minimize lead times when sourcing custom doors?
Plan ahead by establishing relationships with local suppliers who stock common door types and can expedite custom orders. Provide complete specifications early: handing, panel configuration, veneer, hardware finishes, and any fire-rating requirements. Batch orders when possible to reduce per-unit lead time. Confirm delivery timelines in writing and build a 2-3 week buffer into project schedules for custom doors to avoid job site delays.
What hardware considerations are essential when ordering interior doors?
Specify hinge finish (polished brass, satin nickel, oil-rubbed bronze), backset distance (typically 2.375 inches for standard doors), and bore hole diameter to match your hardware. Confirm whether doors come pre-drilled or require on-site boring. Include door stops, threshold specifications if needed, and any specialty hardware like soft-close hinges or privacy locks. Mismatched hardware specifications are a common source of installation delays and returns, document these details in writing when placing orders.
Are you set up to work with homeowners, or just contractors?
Arizona Door Store works with both contractors and homeowners. Whether you're a general contractor managing a residential project or a homeowner planning a door renovation, our team provides expert guidance to help you select the right doors, hardware, and finishes for your needs. We offer personalized consultation at our Scottsdale and Phoenix design centers and can answer your questions about measuring, installation, and product options, no matter your background.
How quickly can you deliver to job sites in Tucson?
Delivery timelines depend on whether you're ordering in-stock items or custom doors. Standard pre-hung and slab doors typically ship within days for local delivery to Tucson. Custom orders may require 2-3 weeks depending on specifications and current lead times. We recommend confirming delivery dates in writing when you place your order so you can plan your project timeline accurately. Contact our team directly for current availability and delivery schedules for your specific project.
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