Doors

Skill Level: Level 1 (Beginner)

Estimated Time: N/A (Selection & Buying Guide)

Introduction

Learning how to choose interior door options is more important than most people realize. Choosing interior doors seems straightforward until you’re standing in a supply house staring at forty options with nearly identical descriptions and wildly different price tags. Hollow core, solid core, MDF panel, real wood panel, flush, shaker, six-panel – each type exists for a reason, and picking the wrong one means wasted money, wasted time, or a finished product that doesn’t match the home’s quality level.

As a finish carpenter, you may not always choose the doors yourself – the builder, designer, or homeowner typically makes that call. But you’ll be the one fielding questions when something doesn’t look right or function well. When you choose interior door types and understand materials and sizing, it makes you a more valuable carpenter and helps you advise clients when they ask for recommendations. And if you’re working on your own projects or remodels, this knowledge is essential.

In production new construction, interior doors are typically specified in the plans and ordered in bulk. The builder chooses a standard door for the entire house – usually a primed MDF hollow-core or solid-core slab depending on the price point. Custom homes and remodels offer more variety and more opportunities for upgrades. Either way, understanding what you’re working with helps you plan your install time, choose the right tools, and set proper expectations with the client.

This guide covers everything you need to know to confidently choose interior door options for any project. We’ll walk through the major types, materials, standard sizing, and the practical tradeoffs between cost and performance. By the end, you’ll know exactly how to choose interior door products and why each decision matters.

Before You Begin

Prerequisites

• Access to the house plans or door schedule showing each opening’s width, height, and swing direction
• Knowledge of the builder’s or homeowner’s budget range and finish expectations (paint grade vs. stain grade)
• Understanding of local building codes for minimum door widths (especially ADA requirements if applicable)
• A tape measure for verifying rough openings if doors haven’t been ordered yet

What to Know

• Interior doors are sold as either pre-hung (slab + jamb + hinges assembled) or slab only (just the door panel). New construction almost always uses pre-hung; remodels may use slabs to fit existing frames.
• Door pricing varies enormously – from $30 for a basic hollow-core slab to $1,500+ for a custom solid wood door. Most production homes use doors in the $50-$150 range.
• The finish type (paint vs. stain) must be decided before ordering. Paint-grade doors use MDF or primed wood; stain-grade doors require real wood species (oak, maple, alder, etc.).
• Lead times for standard doors are typically 1-2 weeks; custom or specialty doors can take 4-8 weeks. Order early.
• All interior doors in a home should match – same panel style, same material, same manufacturer. Mixing styles looks amateurish.

Tools Needed

This is a selection and buying guide, so tool requirements are minimal. You’ll need measurement tools to verify openings and a notepad to record your door schedule.

Measurement Tools

• Tape measure (25 ft) – for measuring rough openings and existing jambs
• Notepad and pencil – for recording measurements and door schedule
• Phone/camera – for photographing existing doors (on remodels) to match style

How to Choose Interior Door Types

There are four main categories of interior doors, each with distinct characteristics, price points, and ideal applications.

Hollow Core Doors

Hollow core doors are the most common and most affordable option. They consist of a thin veneer or cardboard skin stretched over a lightweight internal framework – typically a cardboard honeycomb or thin wood lattice. The edges are solid wood to accept hardware, but the center of the door is essentially air.

• Weight: 15-25 lbs depending on size – light enough for one person to handle easily
• Sound dampening: Minimal. You can hear conversations clearly through a hollow core door. STC rating around 20-25.
• Durability: Moderate. Susceptible to puncture if struck hard. Can’t be easily repaired once damaged.
• Cost: $30-$60 per slab; $80-$150 pre-hung
• Best for: Closets, pantries, utility rooms, budget-conscious production homes
• Avoid for: Bedrooms/bathrooms where sound privacy matters, high-traffic areas

Pro Tip: You can identify a hollow core door by knocking on it – it sounds hollow and tinny. Tap near the center and near the edge: the center will be noticeably hollower. In the field, this is the fastest way to determine what you’re working with.

Solid Core Doors

Solid core doors have a composite wood fiber or particleboard core that fills the entire slab. They’re significantly heavier than hollow core and provide much better sound isolation. This is the standard choice for mid-range to higher-end homes.

• Weight: 40-60 lbs – you’ll want a helper for hanging multiple doors in a day
• Sound dampening: Good. STC rating around 30-35. Conversations are muffled significantly.
• Durability: Excellent. Resistant to dents and impacts. Feels substantial and high-quality when operated.
• Cost: $80-$200 per slab; $150-$350 pre-hung
• Best for: Bedrooms, bathrooms, home offices, media rooms – anywhere sound privacy matters
• Avoid for: Only limited by budget. If the client can afford solid core throughout, that’s the best choice.

Pro Tip: Solid core doors require 3 hinges minimum due to their weight, and you should use heavier gauge hinges (residential heavy-duty or light commercial). If you hang a solid core on 2 lightweight hinges, they’ll sag within a year and the door will drag on the floor.

MDF Panel Doors

MDF (Medium Density Fiberboard) panel doors are the most popular choice for paint-grade installations in new construction. The panel profiles are routed into solid MDF, creating crisp, consistent lines that paint beautifully. Unlike wood, MDF doesn’t have grain patterns that telegraph through paint, and it doesn’t expand or contract with humidity changes.

• Weight: Varies – MDF is used for both hollow core (MDF skin) and solid core (MDF throughout) constructions
• Paintability: Excellent. MDF takes paint perfectly with no grain raise. Smoother finish than any natural wood.
• Stainability: None. MDF cannot be stained – it absorbs stain unevenly and looks terrible. Paint grade only.
• Panel styles: Available in every common profile – 2-panel, 6-panel, shaker, Craftsman, arch-top, and more
• Cost: $50-$150 per slab (slightly more than plain hollow core, significantly less than real wood)
• Best for: Any paint-grade application. This is the industry standard for production new construction.

Pro Tip: When ordering MDF doors, always specify the panel style by name AND profile number from the manufacturer’s catalog. “Shaker” style can look different between Masonite, JELD-WEN, and other manufacturers. Getting the exact profile number prevents surprises.

Real Wood Panel Doors

Solid wood panel doors are the premium option, used primarily in stain-grade applications where the natural wood grain is the design feature. These are made from real wood species – oak, maple, alder, poplar, cherry, or mahogany – with traditional stile-and-rail construction.

• Weight: 50-80 lbs for solid wood – these are the heaviest interior doors you’ll handle
• Appearance: Natural wood grain visible. Each door is unique. Beautiful when stained and finished properly.
• Movement: Wood expands and contracts with humidity. Panels float in the frame to accommodate this. Expect seasonal changes.
• Cost: $200-$800 per slab for stock species; $500-$1,500+ for specialty woods or custom sizing
• Best for: Custom homes, high-end remodels, stain-grade interiors, traditional or craftsman style homes
• Common species: Red oak (most affordable), poplar (paint grade but real wood), maple (fine grain), alder (rustic stain), cherry (rich color that deepens over time)

Pro Tip: If the client wants the “look” of stain-grade wood but is on a budget, consider poplar doors painted a color. Poplar is a real wood with clean grain, and it machines beautifully. It takes paint better than MDF since it’s actual wood – no swelling at edges if water contacts them. It’s a good middle ground.

Choose Interior Door Sizing Guide

Interior doors follow standard sizes that are critical to get right. Ordering the wrong size wastes time and money. Here’s what you need to know.

Standard Heights

• 6’8″ (80″) – Standard residential interior door height. This is used in approximately 90% of homes.
• 7’0″ (84″) – Upgraded height, common in homes with 9-foot or higher ceilings. Gives a more open, modern feel.
• 8’0″ (96″) – Premium height for homes with 10-foot or higher ceilings. Typically custom-ordered.

Pro Tip: The door height should be proportional to the ceiling height. A 6’8″ door in a room with 10-foot ceilings looks stubby and disconnected. If the builder is offering 9-foot ceilings, push for 7-foot doors – the cost difference is modest but the visual impact is significant.

Standard Widths

• 1’6″ (18″) – Narrow utility doors, small closets. Rare in new construction.
• 2’0″ (24″) – Minimum for bathrooms. Tight for some users. Common in powder rooms and small closets.
• 2’4″ (28″) – Common for bathrooms and secondary closets.
• 2’6″ (30″) – Standard minimum for bedrooms. Good balance of space and wall conservation.
• 2’8″ (32″) – Most common residential size. Works for bedrooms, offices, most interior applications.
• 3’0″ (36″) – Required for ADA accessibility. Also standard for master bedrooms and main hallway doors. Provides generous passage width.

Important: ADA (Americans with Disabilities Act) requires a minimum 32″ clear opening for accessible routes. A 3’0″ (36″) door provides approximately 33.5″ clear opening (after deducting the stop and hinge barrel), which satisfies the code. Some jurisdictions require ADA compliance for all bedrooms and bathrooms, not just designated accessible units. Check your local code.

Door Thickness

• 1-3/8″ – Standard interior door thickness. Used for virtually all interior residential applications.
• 1-3/4″ – Exterior door thickness. Occasionally used for interior fire-rated doors or high-end custom interiors.

Pre-Hung vs. Slab Only

This is one of the most important decisions affecting installation time and method.

Pre-Hung Doors

• Slab, jamb, hinges, and door stop come as one assembled unit
• Hinge mortises are pre-cut to match perfectly – no fitting required
• Installation means shimming and securing the entire frame in the rough opening
• Best for: New construction, where the rough opening has no existing jamb
• Cost: $50-$100 more than slab only, but saves 30-45 minutes of installation time per door

Slab Only

• Just the door panel – no jamb, no hinges, no hardware
• You must cut hinge mortises, drill for hardware, and fit to an existing jamb
• Requires more skill and time – hinge mortise routing, lock bore drilling, and careful fitting
• Best for: Remodels where the existing jamb is in good condition and just the slab needs replacement
• Cost: Less upfront, but more labor time. Often nets out to the same or more than pre-hung when you factor labor.

Pro Tip: In production new construction, always use pre-hung. There’s no reason to hang slabs in new jambs when the factory can assemble them perfectly for $50-$100 more. Your time is worth more than that. Slab-only makes sense in remodels where removing the existing jamb would damage the surrounding drywall and trim.

Hinge Considerations

Number of Hinges

• 2 hinges: Acceptable only for very light hollow core doors under 6’8″ tall. Not recommended for any quality installation.
• 3 hinges: Standard for all interior doors. Required for solid core and any door 6’8″ or taller. Most pre-hung units ship with 3 hinges.
• 4 hinges: Used for doors 8’0″ or taller, or for extremely heavy solid wood doors.

Swing Direction (Handing)

Door handing tells you which side the hinges are on and which direction the door swings. Getting this wrong means re-ordering or installing the door backward. Here’s the standard convention:

• Stand on the outside of the room (the side the door swings away from, or the hallway side)
• Right-hand (RH): Hinges on the right, door swings away from you into the room
• Left-hand (LH): Hinges on the left, door swings away from you into the room
• Right-hand reverse (RHR): Hinges on the right, door swings toward you (into the hallway). Less common for interior doors.
• Left-hand reverse (LHR): Hinges on the left, door swings toward you. Less common for interior doors.

Pro Tip: When in doubt about which side is “outside,” think about it from a hallway perspective. The hallway is always the outside. For closets, you’re standing outside the closet. For bathrooms, you’re standing in the hallway. The door swings INTO the room, away from you as you stand in the hallway.

Materials & Finishes

Paint-Grade Options

• Primed MDF – Industry standard for production homes. Smooth, consistent, affordable. Ships with factory primer ready for topcoat. This is what 80%+ of new construction uses.
• Primed hardboard – Thinner composite material, slightly less durable than MDF. Common in the most budget-conscious builders’ specs.
• Primed pine/poplar – Real wood, paint-grade. More expensive but better edge durability than MDF. Doesn’t swell if moisture contacts the edges.

Stain-Grade Options

• Red oak – Most common and affordable stain-grade species. Pronounced grain pattern. Takes stain well. Matches oak trim and flooring.
• Maple – Fine, tight grain. Clean, modern appearance. Can be difficult to stain evenly – test samples first.
• Alder – Soft hardwood with warm reddish tone. Popular in craftsman and rustic styles. Takes stain beautifully.
• Cherry – Rich reddish-brown that deepens over time with UV exposure. Premium price point. Luxurious appearance.
• Mahogany – Deep, rich color with swirling grain. Very stable wood. Highest price point for domestic interior doors.

Pro Tip: Match your door species to the rest of the trim package. If the baseboards and casings are stained oak, the doors should be oak too. Mixing wood species on stain-grade work looks disjointed and unprofessional, even if the stain color is similar – the grain patterns will be obviously different.

Style Matching

The panel profile of your doors should match the architectural style of the home. Mismatched door styles create a visual disconnect that even non-carpenters notice.

Common Panel Profiles

• Shaker (flat panel) – Clean, square lines with flat recessed panels. The most popular choice in modern and transitional homes. Simple, versatile, timeless. Works with virtually any trim style.
• Two-panel – Two horizontal panels divided by a center rail. Common in Craftsman-style homes. Available with flat or raised panels.
• Six-panel (colonial) – Traditional profile with six raised panels. Classic American style. Matches colonial and traditional architecture. Becoming less common in new construction.
• Flush (flat) – Completely flat surface with no panels or profiles. Modern, minimalist. Common in contemporary and mid-century modern designs.
• Arch-top panel – Similar to shaker or colonial but with arched top panels. Adds visual interest. Common in Mediterranean and Spanish-style homes.
• Barn door style – Plank or cross-buck design, typically surface-mounted on a track. Trendy but has practical drawbacks (no privacy seal, takes wall space when open).

Cost vs. Quality Tradeoffs

Understanding the cost spectrum helps you set expectations and make recommendations confidently.

Budget Tier ($30-$80 per slab)

• Hollow core, MDF skin, molded panel profiles
• Functional but feels cheap. Door is light, not solid feeling.
• Panel profiles are molded into the skin – less crisp than routed profiles
• Appropriate for rental properties, spec houses, and budget-conscious projects

Mid-Range Tier ($80-$200 per slab)

• Solid core MDF panel doors with routed profiles
• Good heft, nice feel when operated. Noticeably better than hollow core.
• Clean paint finish with crisp panel lines
• Best value for most homes. This is the sweet spot for quality vs. cost.

Premium Tier ($200-$800+ per slab)

• Solid wood stile-and-rail construction, real wood species
• Stain-grade capable with beautiful grain patterns
• Heaviest and most durable option
• Reserved for custom homes, high-end remodels, and clients who appreciate craftsmanship

Pro Tip: For the best value in production work, recommend solid core MDF shaker doors in the $100-$150 range. They look great painted, feel substantial, provide decent sound isolation, and won’t blow the budget. Upgrade to solid wood only where the client specifically wants stain-grade finish.

Quality Check Criteria

When receiving doors at the job site or inspecting them at the supply house, check every item on this list before accepting delivery.

• ✓ Correct door type, panel style, and material as specified on the order
• ✓ Correct size – measure height and width (don’t trust the label alone)
• ✓ Correct swing direction (handing) for each opening
• ✓ No shipping damage – check all surfaces for dents, scratches, cracks, or chipped primer
• ✓ Slab is flat and not warped – lay on a flat surface and check all four corners contact. Maximum warp tolerance is 1/4″ over the full diagonal for interior doors.
• ✓ Pre-hung units: jamb legs are consistent length, head is properly assembled, hinges are aligned and pins are present
• ✓ Pre-hung units: door operates freely in the assembled frame before you install it in the rough opening
• ✓ All doors match – same panel profile, same manufacturer, same finish quality across the entire order

Troubleshooting

Problem: Door slabs arrived warped – one corner lifts when laid flat.
Solution: Minor warp (under 1/4″) can sometimes be pulled flat during installation by tightening hinge screws progressively. Warp over 1/4″ on interior doors should be rejected and returned. Don’t try to force a badly warped door into service – it will never seal properly and will always look wrong. Contact your supplier for replacement.

Problem: Ordered the wrong handing – doors swing the opposite direction from the plan.
Solution: If you haven’t installed them yet, return and re-order. If you’ve already installed the jamb, most pre-hung interior doors can be “reverse swung” by removing the door, flipping the jamb 180 degrees in the opening, and re-shimming. This only works if the jamb is symmetrical (same reveal top and bottom). For slab-only, you’ll need a new slab with opposite hinge mortises – you can’t simply flip a slab because the bevel on the latch edge will be wrong.

Problem: MDF door edge swelled from moisture exposure.
Solution: MDF is highly susceptible to moisture – even brief exposure to standing water can cause edges to swell. If the swelling is minor, sand it down, seal with primer, and coat all edges with paint. If the swelling is severe (edges expanded more than 1/16″), replace the door. Prevent this by storing doors indoors, off the floor (on stickers or a pallet), in a dry environment. Never lean doors against an exterior wall where condensation can form.

Problem: Hollow core door got punched/kicked – has a visible dent or hole.
Solution: Minor dents can be filled with auto body filler (Bondo), sanded smooth, and painted. For holes, cut the damaged skin out cleanly, glue a backer piece behind the opening, fill with expanding filler or auto body putty, sand flush, and paint. However, for production work it’s usually faster and cheaper to just replace the slab – repair is only worth it when the door is already trimmed out and painted.

Problem: Client wants sound privacy but budget only allows hollow core doors.
Solution: Suggest solid core for just the key rooms – master bedroom, bathrooms, and home office – and hollow core for closets and utility spaces. This targeted upgrade typically adds only $200-$400 to a full house door package but delivers the most impactful improvement. Also recommend adding door sweeps or seals to the bottom, which improves sound isolation significantly even on hollow core doors.

Related Guides

• How To Install a Pre-Hung Interior Door – Step-by-step installation of a pre-hung door unit in new construction
• How To Install a Lockset on a Door – Drilling, fitting, and adjusting interior door hardware
• How To Install Door Jamb Extensions – Extending jambs to match wall thickness for proper casing installation