How window and door size codes work
Builders and suppliers write window and door sizes as a four-digit code: the first two digits are the width and the last two are the height, each in feet and inches.
| Code | Read as | Size |
|---|---|---|
| 2050 | 2′-0″ wide × 5′-0″ tall | 24″ × 60″ |
| 3050 | 3′-0″ × 5′-0″ | 36″ × 60″ |
| 2040 | 2′-0″ × 4′-0″ | 24″ × 48″ |
| 3068 | 3′-0″ × 6′-8″ | 36″ × 80″ door |
| 6080 | 6′-0″ × 8′-0″ | 72″ × 96″ double door or slider |
Some manufacturers use their own naming, and codes usually describe a nominal unit size, not the exact rough opening. The schedule should make clear which one it means.
Common residential window and door sizes
| Use | Typical codes |
|---|---|
| Bedroom windows | 3050, 3040, 2850 (check egress) |
| Living room windows | 3060, (3) 2050, 5050 picture |
| Kitchen sink window | 3040, 4040 (sill above backsplash) |
| Bathroom windows | 2030, 2020 (often obscure or tempered glass) |
| Transoms | 2020, 3010, 3020 fixed |
| Front entry | 3068 or 3080 single; 6068 or 6080 double |
| Patio doors | 6068 or 8080 slider; multi-panel systems for large openings |
| Interior doors | 2868, 2668, 2468 |
Bedroom windows also have to meet emergency escape size — see bedroom egress window requirements.
Triples, mulled units and transoms
When windows are grouped, the count goes first in parentheses:
- (3) 2050 — three 2050 units side by side, usually factory-mulled (joined) into one frame.
- (3) 2020 FX over (3) 2050 — three fixed transoms stacked above three 2050s.
- (2) 3050 DH — two double-hung 3050s mulled together.
Writing groups this way is what a framer and a window supplier expect. “Window x3, 24×60” can be read several ways; “(3) 2050 DH mulled” can't.
What a good window and door schedule includes
| Column | Example |
|---|---|
| Mark | W1, W2, D1 — matches the tag on the plan |
| Quantity | 4 |
| Size code | (3) 2050 |
| Type / operation | DH, CSMT, FX, SL |
| Rough opening | Per manufacturer, e.g. 24½″ × 60½″ per unit |
| Head height | Top of opening from floor, e.g. 7′-0″ or 8′-0″ |
| Glazing | Tempered, obscure, low-E |
| Notes | Egress, grilles, color, hardware |
A consistent head height across a wall matters as much as the sizes — it's what makes windows line up on the elevation. Glass near doors, in tub and shower areas and in some large low panes usually has to be tempered; your schedule should flag those.
Our review flags missing schedules, mismatched elevations, egress problems and non-standard sizes — and marks the fix on your plan. From $99.
See how plan review worksWindow type abbreviations
| Abbreviation | Type |
|---|---|
| SH / DH | Single-hung / double-hung |
| CSMT | Casement |
| AWN | Awning |
| SL / HS | Slider / horizontal slider |
| FX / PW | Fixed / picture window |
| TR | Transom |
| SGD | Sliding glass door |
New to reading drawings? See how to read construction blueprints.
Window and door mistakes that cause delays
- No schedule at all — only sizes written in inches on the plan.
- The floor plan and the elevation show different windows.
- Transoms or clerestory windows on the elevation that were never requested.
- Fixed windows in bedrooms that need an egress opening.
- Kitchen window sills below the backsplash or counter height.
- Different sizes on either side of the front door.
- Door swings that hit cabinets, furniture or each other.
Each one turns into a phone call, a re-order or a change order. Our plan review checks that every window and door is labeled clearly in builder-standard sizes. If you're comparing window bids, see is my window bid too high?
Frequently asked questions
What does 2050 mean on a window?
A window 2 feet 0 inches wide by 5 feet 0 inches tall (24 by 60 inches). The first two digits are the width and the last two the height, in feet and inches.
What size is a 3068 door?
A door 3 feet 0 inches wide by 6 feet 8 inches tall (36 by 80 inches), the most common exterior entry door size.
What does (3) 2050 mean on a plan?
Three 2050 windows grouped side by side, usually mulled into one unit.
What is the difference between window size and rough opening?
The size code is the nominal unit size. The rough opening is the framed hole, typically slightly larger. Always use the manufacturer’s rough opening for framing.
What should a window schedule include?
A mark that matches the plan, quantity, size code, type, rough opening, head height, glazing notes such as tempered or egress, and any hardware or color notes.