Interior Door Cost Calculator
Estimate the total cost of interior doors for your project.
Choose door type and hardware to get a complete budget including installation.
Door quantity estimation calculates the number of interior and exterior doors needed for a residential or commercial building project. Getting this right early prevents costly mid-construction material shortages and budget overruns.
Core formula: Total Doors = Exterior Doors + Interior Doors Interior Doors = Total Interior Doorways (per floor plan room count)
Rule-of-thumb estimating formulas: Interior Doors (residential) ≈ Number of Rooms + Number of Bathrooms + 1 (for each closet) Exterior Doors (residential) ≈ 1 front + 1 rear + 1 per garage bay + 1 per basement access
What each variable means:
- Exterior Doors — entry/egress doors exposed to weather. These require higher-grade materials: solid core, weatherstripping, and reinforced frames. Standard sizes: 36" × 80" (main entry), 32" × 80" (secondary).
- Interior Doors — interior passage doors. Standard hollow-core doors work for most interior applications. Standard size: 28"–32" × 80"; bathroom: 28" × 80"; bedroom: 30"–32" × 80".
- Closet Doors — bifold or bypass (sliding) doors. One opening may require 2 door panels.
- Pocket Doors — recessed into the wall. Count the wall rough opening, not door panels.
Standard residential door counts by home size:
| Home Size | Typical Exterior Doors | Typical Interior Doors | Total |
|---|---|---|---|
| 1,000 sq ft (2BR/1BA) | 2–3 | 6–8 | 8–11 |
| 1,500 sq ft (3BR/2BA) | 3–4 | 9–12 | 12–16 |
| 2,500 sq ft (4BR/3BA) | 4–5 | 14–18 | 18–23 |
| 3,500 sq ft (5BR/4BA) | 5–6 | 18–24 | 23–30 |
Worked example: A 2,200 sq ft single-story home with: 3 bedrooms, 2 bathrooms, kitchen, dining room, living room, laundry room, 2 bedroom closets, 1 linen closet, 2-car garage.
Exterior: front entry (1) + back door (1) + garage man door (1) = 3 exterior doors Interior room doors: 3 bedrooms + 2 bathrooms + laundry = 6 doors Closet doors: 2 bedroom closets + 1 linen = 3 openings (6 bifold panels) Total door openings: 12 openings (not counting closet panels separately)
Budget note: Hollow-core interior doors: $60–$200 each. Solid-core interior doors: $150–$500 each. Exterior entry doors: $300–$3,000+ depending on material and style.