How much do interior doors cost?

Hollow core slabs cost $30-$100. Solid core costs $80-$250. Solid wood costs $150-$600+. Add $50-$150 for prehung (includes frame). Professional installation adds $100-$250 per door. Replacing 10 doors in a home costs $1,300-$4,000 DIY (solid core) or $2,500-$6,500 professionally. What is the difference between hollow core and solid core doors?

What is the difference between hollow core and solid core doors?

Hollow core doors have a cardboard honeycomb interior — they're light, cheap ($30-$100), but provide minimal sound blocking. Solid core doors are filled with composite material — heavier, better sound blocking (STC 30-35), and more durable ($80-$250). Solid core is recommended for bedrooms, bathrooms, and offices. What is the standard interior door size?

What is the standard interior door size?

Standard interior doors are 80 inches tall (6 feet 8 inches). Common widths: 30 inches (bedrooms), 32 inches (bathrooms), 36 inches (main rooms, ADA compliant). Standard thickness is 1-3/8 inches. ADA requires a minimum 32-inch clear opening, which means a 36-inch door. Should I buy prehung or slab doors?

Should I buy prehung or slab doors?

Prehung doors (already mounted in a frame) are easier to install and best for new openings or replacing both door and frame. Slab doors are just the door and best for replacing a door in an existing frame (cheaper, but you must match hinge and knob locations). Most homeowners find prehung easier despite the higher cost ($50-$150 more).

Article

Woodworking & Lumber

Interior Door Guide: Types, Sizes, Cost & Installation

Lumberama Editorial Team, Door & Millwork Specialists Sep 11, 2026 9 min read

Door Types by Construction

Hollow core: Cardboard honeycomb interior. Lightest and cheapest option. Minimal sound blocking. Cost: $30-$100. Best for: closets, pantries, low-traffic areas.

Solid core: Filled with composite material (MDF or particle board). Good sound blocking (STC 30-35). Heavier, more substantial feel. Cost: $80-$250. Best for: bedrooms, bathrooms, home offices. Recommended for most applications.

Solid wood: Made entirely of real wood (pine, oak, maple). Best sound blocking. Heaviest option. Can warp in high humidity without proper finishing. Cost: $150-$600+. Best for: visible focal points, premium homes.

MDF (medium-density fiberboard): Smooth, paintable surface. Won't crack or split. Good for painted finishes. Cost: $60-$200. Best for: painted doors (smooth finish).

Panel Styles

Flat panel (Shaker): Clean, simple lines. Most popular style currently. Works with modern, traditional, and transitional homes.

Raised panel: 3D panel detail. Traditional look. More ornate.

2-panel: Two rectangular panels. Classic, versatile.

6-panel (colonial): Six rectangular panels. Most traditional American style.

1-panel (slab): Single flat panel. Modern, minimalist.

Glass panel: One or more glass inserts. Allows light transfer between rooms. Options: clear, frosted, textured, leaded. Cost: $100-$400+.

French doors: Double doors with glass panels. Elegant room dividers. Cost: $200-$800+ per pair.

Barn doors: Slides on track (no swing). Space-saving. Trendy/modern farmhouse. Less sound blocking (gaps around edges). Cost: $100-$500+ (door + hardware).

Standard Sizes

Width: Interior: 24, 28, 30, 32, 36 inches. Most common: 30 inches (bedroom), 32 inches (bathroom), 36 inches (entry). ADA minimum: 32 inches clear opening (36 inch door). Closet: 24 inches (single), 48-60 inches (double/bifold).

Height: Standard: 80 inches (6 feet 8 inches). Tall: 84 inches (7 feet) or 96 inches (8 feet).

Thickness: Standard interior: 1-3/8 inches. Exterior: 1-3/4 inches.

Prehung vs Slab

Prehung: Door already mounted in frame with hinges. Ready to install in rough opening. Easier installation. Cost: $50-$150 more than slab. Best for: new construction, replacing door AND frame.

Slab only: Door without frame. Must mortise hinges, drill knob hole. More work to install. Cheaper than prehung. Best for: replacing just the door in existing frame. Requires matching existing hinge and knob locations.

Cost

Door cost (slab): Hollow core: $30-$100. Solid core: $80-$250. Solid wood: $150-$600+. Prehung: add $50-$150.

Hardware: Knob/lever: $15-$80. Hinges (3 per door): $5-$15/set.

Professional installation: Prehung door: $100-$250 per door (labor). Slab door (in existing frame): $75-$150 per door (labor).

Whole-house door replacement (10 doors): Hollow core prehung: $800-$2,000 (DIY). Solid core prehung: $1,300-$4,000 (DIY). Professional (solid core): $2,500-$6,500.