Short answer
The standard entry door in American homes is 36 inches wide by 80 inches tall and 1 3/4 inches thick, and 32-inch and 30-inch widths are the next most common. What matters for your project is not the slab size but the rough opening in the wall, because the door, the jamb and the shim space all have to fit inside it. If your opening does not match a stock size, the answer is either a custom-built unit or reframing the opening, and both are normal work.
The standard entry door in American homes is 36 inches wide by 80 inches tall by 1 3/4 inches thick. That is the size most stock doors, most storm doors and most hardware sets are built around, and it is what sits in the majority of front openings built since the 1970s. Widths of 32 and 30 inches are the next most common, and 34 inches shows up as well.
But the slab size is only half the question. What decides what fits is the rough opening — the framed hole in the wall — because a prehung door brings its own jamb with it, and the jamb, the shims and the door all have to live inside that opening. Homeowners who measure only the old door and order from that number end up with a unit that is either too tight to shim square or floating in a gap that has to be furred out. Getting the entry door sized right starts with measuring the opening, not the door.
What is the standard entry door size?
For a single swinging entry door, these are the sizes that exist as normal production units:
- Widths: 30, 32, 34 and 36 inches. Thirty-six is the default on a front entry. Thirty-two and 30 are common on side, rear and basement entries.
- Heights: 80 inches is standard. Ninety-six inches — a true eight-foot door — is a normal option and shows up on newer homes with taller ceilings and higher entry walls.
- Thickness: 1 3/4 inches for exterior doors. Interior doors are 1 3/8 inches, which is why an interior slab can never be reused in an exterior opening.
Double doors and doors with sidelights are built from those same slab widths. A pair of 30-inch doors makes a 60-inch opening; two 36-inch doors make 72 inches. A 36-inch door with two 14-inch sidelights is a considerably wider unit than a 36-inch door alone, and the framing has to account for the whole assembly.
How are door sizes written on a quote?
The trade writes sizes in feet and inches, shortened. A 36 by 80 door is a 3/0 x 6/8 — three feet zero inches by six feet eight inches. A 32-inch door is a 2/8. An eight-foot-tall door is a 6/8's taller cousin, 8/0. When you see "3/0 6/8 fiberglass, 4 9/16 jamb, LH inswing" on a proposal, that is the whole geometry of the unit in one line.
Here is how the common sizes translate:
| Trade size | Slab size | Typical rough opening | Where it usually appears |
|---|---|---|---|
| 2/6 x 6/8 | 30" x 80" | about 32" x 82.5" | Rear and basement entries |
| 2/8 x 6/8 | 32" x 80" | about 34" x 82.5" | Side entries, older front doors |
| 2/10 x 6/8 | 34" x 80" | about 36" x 82.5" | Less common, still stocked |
| 3/0 x 6/8 | 36" x 80" | about 38" x 82.5" | The standard front entry |
| 3/0 x 8/0 | 36" x 96" | about 38" x 98.5" | Newer homes, taller entries |
| 5/0 double | two 30" doors | about 62" x 82.5" | French and double entries |
| 6/0 double | two 36" doors | about 74" x 82.5" | Wide formal entries |
Treat the rough opening column as a starting point. It varies by manufacturer and by how the sill and threshold are detailed, which is one more reason the final measure happens on site rather than off a chart.
How do you measure your own opening?
You do not have to do this — we measure every opening we quote — but knowing the numbers before an estimate makes the conversation faster.
Measure the slab
With the door closed, measure the door panel itself: width across the face, height from the top edge to the bottom edge, and thickness on the edge. Round to the nearest common size. A door that measures 35 3/4 inches is a 36-inch door that has been painted a few times.
Measure the frame opening
Measure inside the jamb, jamb leg to jamb leg, at the top, middle and bottom. Then measure the height from the threshold to the head jamb on both sides. If those three width readings differ by more than about a quarter inch, the opening has settled and is out of square — extremely common in older homes, and something that gets corrected during install rather than ignored.
Measure the jamb depth
This is the one homeowners skip. Measure the depth of the existing jamb from interior trim edge to exterior trim edge. A 2x4 wall with sheathing and siding is usually 4 9/16 inches. A 2x6 wall is usually 6 9/16 inches. Brick veneer, added insulation and old plaster all change it. Order a door with the wrong jamb depth and you are adding extension jambs on the interior or building out trim on the exterior.
Note the swing
Stand outside facing the door. If the hinges are on your right and the door pulls toward you, that is one hand; if it swings away from you it is another. Handing is described as left or right, inswing or outswing. It is a small detail that determines whether the unit is usable when it arrives.
What if the opening is not a standard size?
This is normal, especially on homes built before the 1960s. Openings of 30 by 78, 32 by 78 and various in-between dimensions were common, and no stock unit matches them. You have three legitimate paths.
Order a custom-sized unit. Both brands we carry, ProVia and Andersen, build to size. The door is made for your opening, the framing stays untouched, and the interior and exterior trim mostly go back the way it was. This is the cleanest option on an older home where the trim is original and worth keeping.
Reframe the opening. If your front entry is a 32-inch door and you want a 36 with sidelights, the wall has to change — new header, resized trimmers, new sill framing. It is a bigger job, it typically requires a permit, and it is the right call when the current opening is genuinely too small for how the entry is used.
Fur the opening down. Occasionally an opening is oversized and the correct fix is adding framing to bring it to a standard rough opening. Straightforward, as long as the added material is fastened properly and the flashing detail is rebuilt.
What is not on the list is forcing a unit into an opening it does not fit and filling the difference with foam and trim. That is how a door ends up out of square, dragging on the threshold within two years and leaking at the corners.
Does entry door size have to meet code?
Yes, for at least one door. The residential code requires a home to have a main exit door that is side-hinged and provides a minimum clear width of 32 inches and a minimum clear height of 78 inches when the door is open 90 degrees. In practice that means the required exit door is a 36-inch unit, because a 32-inch door loses width to the stop and the open slab and does not deliver 32 inches clear.
Other exterior doors are not held to that standard. A 30-inch rear entry or basement door is fine. But if the door you are replacing is your home's required exit, going smaller is not an option, and that is one of the things the permit and inspection process is there to catch. We pull the permit through your local building department as part of full service when your project requires one.
Does size change what a door costs?
Size matters less than you would expect. A replacement entry door installed runs about $3,973 to $7,500 in our market, and the numbers that move within that range are material, glass, sidelights or a transom, hardware, and what the crew finds under the threshold once the old unit is out. A 36-inch door and a 32-inch door in the same product line and the same finish are close in price.
What does add cost is a size the wall does not currently accept. Widening an opening brings framing labor, a new header, interior drywall repair and exterior trim work into the scope. An eight-foot-tall door is a taller unit with more glass and heavier hardware. Custom sizes carry a premium over stock, though it is usually smaller than homeowners assume and almost always cheaper than reframing. If the number is the deciding factor, financing through the GreenSky program includes no-interest-if-paid-in-full plans and fixed-rate terms, with zero down for most approved homeowners.
Whichever size you land on, the install is what makes it hold. The unit gets set plumb and square on a solid subsill, shimmed at the hinges and the strike, air-sealed around the perimeter and flashed so water goes out rather than in. That workmanship is what The Patriot's Promise covers in writing alongside the product itself.
What to do next
Measure your slab and your jamb depth if you want a head start, then have the opening measured properly. Sizes on a chart are a reference; the three widths, two heights and jamb depth on your actual wall are the numbers a door gets built to. Schedule a free in-home estimate and you will get every opening measured, the install method spelled out, and one itemized price.
