"Where to buy a 24 inch entry door" is a question that cannot be answered in one sentence, because twenty-four inches is simultaneously a stock size in two catalogs, the name of a closet door in a third, and absent from a fourth. Which of those four you should be shopping has nothing to do with the door and everything to do with one thing the search box does not capture: whether this door is somebody's way out of the building.
We make aluminium windows and doors, and our own entry door category is empty today. That is stated plainly further down rather than buried, because it changes what we are allowed to sell you and what we are only allowed to help you specify. What we can do is lay out the four catalogs, the arithmetic that decides whether the door is legal at all, and the data block you should be sending to whoever you end up buying from.
The single most expensive mistake in this search is assuming that a "24 inch door" is one product that different shops price differently. It is at least four products. In two of them the number describes the opening. In one it describes the slab. In one it does not exist. Here is the whole map in one table; every row is drawn from a public source, and the source type is named.
| Catalog | Is 24 there? | What the number refers to | What you physically receive | What it is not |
|---|---|---|---|---|
| Commercial hollow metal doors and frames (Steel Door Institute, standard opening sizes) | Yes — 2 feet 0 inches is the first width in the table | The opening, not the leaf | Leaf is nominal minus one quarter inch in width and minus seven eighths of an inch in height, so about 23-3/4 by 79-1/8 inches | Not a residential entry door. No decorative face, no domestic finish, and it wants a commercial frame and commercial hardware |
| Residential interior passage doors | Yes — 24 inches is a normal small width | The slab itself | Roughly 24 by 80 inches, at one and three eighths inches thick | Not weather rated, not self-latching, and a hollow core version is a documented inspection failure in a fire separation |
| Bifold closet units | Yes — 24 inches is a common single-pair width | The finished opening | Two panels of about 11-3/4 inches each; the pair measures roughly 23-1/2 by 79 inches | Not a person door to the outdoors. No perimeter compression seal, no threshold, no weather line |
| Residential exterior and front entry door lines | No — public sizing guides describe the standard exterior entry door as 36 inches wide | Not applicable | A special order, if the line will make it at all | This is the catalog most people assume they are shopping, and it is the one that does not have it |
So the honest first answer to "where do I buy one" is: it depends which of the top three rows you actually need, because the bottom row is the one you typed the word "entry" for.
Commercial steel doors are ordered by a four digit call size, and this is where a search for "24" quietly turns into a twenty-eight inch door. The convention is width in feet and inches, then height in feet and inches. A door for a 2 foot 0 inch by 6 foot 8 inch opening is call size 2068. A door for a 2 foot 4 inch by 6 foot 8 inch opening is call size 2468. In the first code the characters "20" mean two feet zero. In the second code the characters "24" mean two feet four inches, which is twenty-eight inches, not twenty-four.
There is a second reason to distrust the code on its own. The standard opening size table published by the Steel Door Institute lists widths of 2 feet 0, 2 feet 4, 2 feet 6, 2 feet 8, 2 feet 10, 3 feet 0, 3 feet 4, 3 feet 6, 3 feet 8, 3 feet 10 and 4 feet 0, with metric equivalents from 610 millimetres to 1219 millimetres. Heights for doors of one and three quarter inches thick are 6 feet 8, 7 feet 0, 7 feet 2, 7 feet 10 and 8 feet 0. Doors of one and three eighths inches thick are only listed at 6 feet 8, 7 feet 0 and 7 feet 2. Two separate commercial door distributors that we checked reproduce that table verbatim, and both of them carry the same anomaly in the seven foot height group, where the 2 foot 4 inch row is labelled with a call size that belongs to the six foot eight group. An identical anomaly in two places is not two independent confirmations; it is one typo that travelled. Order by call size and by a written dimension, never by the code alone.
This is the section that decides whether your project passes, and it is two subtractions long. A model residential code, the International Residential Code, says in Section R311.2 that the required egress door shall be side hinged and shall provide a clear width of not less than 32 inches, measured between the face of the door and the stop with the door open 90 degrees, with a clear height of not less than 78 inches measured from the top of the threshold to the bottom of the stop. Note the measuring instruction: not the door, the gap.
Now take a 24 inch hollow metal door. Published distributor guidance for that product family states that the actual door is smaller than the nominal size by one quarter inch in width and seven eighths of an inch in height, to allow clearance and undercut. So the leaf is about 23-3/4 inches wide. Open it to 90 degrees and the leaf now stands across the opening, occupying its own thickness of one and three quarter inches. Twenty-three and three quarters minus one and three quarters is twenty-two inches. That is your clear width. Twenty-two inches is about 559 millimetres, against a required 813 millimetres. The door is roughly 254 millimetres, about ten inches, short of the number the code asks for.
A public flooring and door guide reaches the same place from the other direction: it states that a 32 inch door only provides about 30 inches of clear width when open, which is why it recommends a 36 inch door wherever true accessibility is the goal. Two inches lost, both times. Different catalogs, different starting points, same subtraction. Whatever you buy, the clear width you get is approximately the nominal width minus two inches.
Because the figure is local, do not carry it across a border. One published state amendment we read rewrites the egress section entirely: a primary egress door at 32 inches clear, a secondary egress door permitted at 28 inches clear, interior doors serving habitable rooms at a minimum 30 inch nominal width, bathroom doors at 28 inch nominal, and bathroom doors in existing buildings at 24 inch nominal. That last line is the only place in everything we read where a code names twenty-four inches at all — and it names it as a bathroom door in an existing building, not as an entry door. It is also a reminder that the code counts different things in different sentences: some of those figures are clear widths measured with the door open, and some are nominal widths printed on a label. Never move a number from one column into the other.
The search volume behind this phrase is not one buyer. It is at least six, and they should not be sent to the same shop.
| Situation | Is it a means of egress? | What the code actually touches | What to buy | What sinks it |
|---|---|---|---|---|
| Shed, workshop or outbuilding | Usually no | Whatever your authority applies to accessory structures, which may be nothing at all | Utility grade steel or fibreglass from an outbuilding supplier, or the cheapest hollow metal leaf you can find | Assuming the exemption exists. Ask, in writing, before you frame |
| Person door into an attached garage | No, but it sits in a fire separation | The dwelling garage opening protection rule, which sets construction and hardware, not width | A door that meets one of the listed constructions, plus self-closing and self-latching hardware | A hollow core interior slab. It is named in inspection guidance as a common correction |
| Exterior door to a mechanical or utility room | No | Any rating attached to the room, plus weather sealing | Hollow metal is genuinely the right product family here, and it is a stock size | Forgetting the threshold. A utility door still needs a sill detail and a drainage path |
| Existing narrow opening in an old house | Only if it is the one required egress door | Alteration rules, and whatever your authority says about non conforming openings | A custom millwork unit sized to the actual measured opening, because nothing stock will fit an old frame | Ordering from the label on the old door instead of from three measurements of the opening |
| Tiny house, cabin, she shed, small dwelling unit | Very likely yes | The required egress door dimension, and the landing rules that come with it | A wider door. If the structure is small, this is the moment to change the framing, not the door | Buying the narrow door first and discovering the egress problem at inspection |
| Someone who actually wants a closet opening | No | Nothing | A folding unit sized to the finished opening, not a hinged exterior door at all | Buying an exterior rated leaf for an interior opening and paying for weather performance you cannot use |
That last row is not a joke. A meaningful share of this search is a person standing in a hallway with a tape measure who has an interior opening and typed the wrong adjective. If your opening is inside the building and the thing behind it is a water heater, a linen shelf or a wardrobe rail, you want a unit built for that job. A pair of 24 bi fold doors is a two panel closet unit with each leaf around eleven and three quarter inches, and bi folding closet doors more generally are a completely different product family from anything with a threshold and a weather line. Confirm which side of the wall you are standing on before you spend money.
If your 24 inch door opens between a private garage and the dwelling, the width stops being the interesting variable. Model residential code Section R302.5.1 requires that openings between the garage and the residence be equipped with solid wood doors not less than one and three eighths inches thick, solid or honeycomb core steel doors not less than one and three eighths inches thick, or 20 minute fire rated doors, and that the door be self latching and equipped with a self closing or automatic closing device. It also prohibits any opening from a private garage directly into a room used for sleeping.
Three things about that paragraph matter more than its width. First, it offers three compliant constructions, and a labelled fire door is only one of them — the code does not require a rated assembly for this opening. Second, the hardware is as binding as the leaf: a door that swings shut but does not latch is not compliant in inspection terms, and inspection guidance lists missing closer arms, painted over latches, weak spring hinges and warped slabs among the usual failures. Third, and this is the point for anyone shopping narrow, not one word of it is about width. A 24 inch door and a 36 inch door in that wall have to satisfy exactly the same sentence.
Almost nobody thinks about the ground on the far side of the threshold until the door is already hanging, and it is the part of this project most likely to be redone. A model residential code requires a landing or floor on each side of every exterior door, says the landing shall be not less than the width of the door served, and says it shall have a dimension of not less than 36 inches measured in the direction of travel. It also caps the slope of an exterior landing at one quarter unit vertical in twelve units horizontal, which is about two percent.
Then the two tiers appear again, split on exactly the question that decided the width. At the required egress door, the landing or finished floor may be not more than one and one half inches, 38 millimetres, lower than the top of the threshold. At doors other than the required egress door, the landing may be as much as one stair riser below the top of the threshold. So the narrow door at the top of a short flight of steps is sometimes permitted and sometimes not, and the only thing that decides it is whether another door is carrying the egress obligation.
Two practical consequences. First, size the pad before you size the door: a 24 inch door still needs a landing at least as wide as the door and at least 36 inches deep, so the surface outside it is wider than the opening and one and a half times deeper than it is wide. Second, treat the threshold as the datum and set both at the same time. The rule measures downward from the top of the threshold, which means replacing an old door with a taller threshold can put you on the wrong side of the limit without anybody touching the landing at all.
A large share of the 24 inch doors that get bought are replacements, and the measurement that produces them is almost always the old door. That is the wrong object. An old leaf has been planed, painted, scribed and swollen, and it is the least reliable thing in the opening.
Then take a fourth measurement that is not a measurement but a list: the wall, from the outside face inwards, layer by layer. Cladding, cavity, sheathing, framing, lining. Send the list rather than a single depth. A single depth is a guess wearing a number, and jamb depth is the field most often filled in by someone else on your behalf.
People expect a narrow door to cost less in proportion to its width, and it never does, because almost none of the work in a door is proportional to width.
Which leads to the uncomfortable question that should be asked before any of this: can the hole get bigger? A wider opening needs a wider header, and a wider header in a load bearing wall is structural work, so the answer is sometimes no. But it is worth asking, because the cheapest door in this whole article is a stock 28 entry door or a stock 32 inch unit, and the second cheapest is a standard 36 inch door with the opening reframed. Custom narrow is the third option, not the first. Check the three conditions that usually block reframing — a load bearing wall you cannot touch, an outside corner or a grade change too close to the opening, and a facade where losing wall area costs you something you care about — and if none of them apply, buy the stock door.
We are an aluminium sliding door and window manufacturer, so this section costs us something, and that is precisely why it is worth reading. A sliding door is the wrong answer to a narrow opening.
Run the arithmetic on a 610 millimetre opening, which is 24 inches. Our published frame width on one sliding series is 26 millimetres, so with frame members on both sides the inner clear width is roughly 558 millimetres before any panel is counted. A two panel unit in that space gives you a passage of about half that, in the region of 275 millimetres, because the moving leaf can only ever park behind the fixed one. Hinged, the same opening gave us about 559 millimetres of clear width. The swing door delivers roughly twice the usable opening in the same hole, and it delivers it with one leaf instead of two, one track instead of two, and no interlock profile standing permanently in the middle of your view.
Sliding earns its place when the opening is wide enough that two panels make sense and when the swing arc is the thing you cannot afford. Neither is true at twenty-four inches. If you are reading this because you have a narrow opening and you were hoping a sliding unit would let you keep the wall, the honest advice is to keep the swing leaf.
Here is the buying map. Read the last column first — it is the one people skip.
| Channel | Is 24 in the rack? | Lead time character | What you can get in writing | What it will not solve |
|---|---|---|---|---|
| Large home improvement retailer, off the shelf | Generally no. Public guides describe this size as rarely stocked | Immediate, for what is on the rack | A label and a receipt | Your opening, your wall depth, your handing, your threshold |
| Retailer millwork desk, special order | Sometimes, if the line offers it | Long, and opaque once placed | An order confirmation with a nominal size on it | Any construction choice outside that line's option list |
| Local millwork or door shop | Yes, routinely | Weeks, and negotiable | A shop drawing with your opening dimensions on it, and a jamb depth built for your wall | A stock price, and any hope of matching it later from a catalog |
| Commercial hollow metal door and frame distributor | Yes — it is a standard size here, call size 2068 or 2070 | Shortest of any real exterior door | Gauge, core type, fire label where applicable, hardware schedule | Looks. It will look like a commercial door, because it is one |
| Utility building and outbuilding supplier | Often yes | Short | Material and nominal size | Fire separation, dwellings, and anything an inspector will look at |
| Full line manufacturer, made to order programme | Usually yes, within a range | A production cycle, not a delivery cycle | Test reports, section drawings, finish and glass specifications | One off urgency. A made to order narrow door cannot be rushed into a lorry |
| Salvage and architectural reuse | Frequently, because older houses had them | Whenever you find it | Nothing, usually, beyond a measurement | Ratings, weather performance, and the second one you will need when it fails |
Most of the pain in this search is not finding a seller. It is the four emails of clarification that follow the first quote. Send this instead. Leave nothing blank: the third column is what the blank turns into.
| Field | What a good answer looks like | If you leave it blank |
|---|---|---|
| 1. Is this a required means of egress | Yes / No / Do not know, with who will decide | Every quote is built on an assumption, and the assumption surfaces at inspection |
| 2. Nominal callout in inches and required clear width in millimetres | ____ x ____ nominal, ____ mm clear required | You receive a door that matches the label and misses the rule by about two inches |
| 3. Height, and whether it is leaf or opening | ____ , leaf / opening / rough opening | Seven eighths of an inch of undercut argument on site |
| 4. Wall, layer by layer from outside in | ____ cladding, ____ cavity, ____ sheathing, ____ framing, ____ lining | Jamb depth guessed, and the frame arrives proud or short of the face |
| 5. Handing, plus the convention used | Left / right, viewed from ____ , per ____ convention | A mirror image door that nobody will take back, because handed hardware is not resaleable |
| 6. Swing direction, and what it swings over | In / out, over ____ | The leaf parks across a step, a switch or a walkway |
| 7. Threshold and finished floor levels, inside and out | ____ type, ____ mm inside, ____ mm outside | A sill that cannot be set, and a landing that fails the level rule |
| 8. Fire or smoke requirement, and who signs | ____ rating, required by ____ , signed by ____ | An unrated leaf in a rated wall, which is the whole separation gone |
| 9. Glass: none, size, type, and safety glazing trigger | ____ , ____ mm, ____ type | A lite fitted where the code requires a safety glazing classification |
| 10. Lock prep: backset, bore, case, stile width available | ____ backset, ____ bore, ____ case | A lock that does not fit the only stile you have |
| 11. Finish, and whether it must match other units | ____ finish, batch ____ , matching ____ | Two doors, two colours, and a visible difference from the hallway |
| 12. How many identical units | ____ identical, ____ total doors | You are quoted as one unique piece instead of as a repeat |
| Ask | An answer worth having | An answer that sounds reasonable and carries no information |
|---|---|---|
| Is this door compliant | Which clause, which edition, and whether this unit is the required egress door | "It meets all building codes" |
| What is the actual leaf size | A written dimension in millimetres, for the leaf, not the label | "24 inches, like you asked" |
| What is the clear width open to 90 degrees | A number, with the leaf thickness subtracted | "It is a 24 inch door" |
| Can this be the back door of a dwelling | Only if another door is the required egress door, and they will ask you to confirm it | "Sure, people do it all the time" |
| Is it exterior rated | What the test was, to which standard, and on which construction | "It is a solid door" |
| What jamb depth will you build | A number, after you have sent the wall build up | "Standard" |
| Which side is the hinge on | A drawing, plus the convention they are using to name it | "Left or right, as required" |
| Does it come with the frame and the sill | A line by line list of what is in the crate | "We can supply everything" |
| Is the glass safety glass | The classification and the permanent marking that proves it | "It is tempered style glass" |
| Can I get another one later | A record of the profile, the finish batch and the hardware set, kept with the order | "Spare parts are available" |
Two honest statements before the table. Our entry door, swing door and folding door category pages are empty at the time of writing, so if you came here to buy a 24 inch hinged exterior door from a catalog, we are not the shop today and we would rather say that than build a schedule on a placeholder. And a 24 inch opening is one of the few places where our own product family is the wrong answer, which is the reason for the section above.
What we can do is hand you the same discipline we apply to our own published numbers, and the same variables follow you into whichever shop you buy the door from. You can see how we document our own work in the project archive.
| Item | Published or not | Why the gap exists, and what it means for this door |
|---|---|---|
| Profile alloy and temper | Published: 6060-T66 | It is a material statement, not a performance grade. Treat it as a floor, not a differentiator |
| Profile wall thickness | Published: 1.8 to 2.5 millimetres | On a narrow leaf the same thickness behaves differently, because the section resisting twist is driven by height and width together |
| Thermal break | Published: PA66GF25, 34 to 44 millimetres on one series | A narrow door is mostly frame relative to its area, so the break matters more here than on a wide unit, not less |
| Thermal transmittance | Published as system values for some series: 1.3, 1.6 and 1.7 | A system value is not a whole door value and is not your door. Ask for the calculation on your size and your glass |
| Corrosion and shear test figures | Published for one series only | They belong to that series and do not transfer. Neither is a weather rating for a door |
| Hardware cycle counts | Published as a bench figure | A rig number is not a service life. Ask what it was cycling, at what load |
| Air, water and wind classification | Not published for any series | Unpublished is not worse, it is just incomparable. Ask for a report with a standard name on it |
| Your opening, anchoring and drainage path | Cannot be published | They are yours, not ours. Nobody can sell you that line in a catalog, and anybody who tries is guessing |
Not if it is the required egress door, and on a dwelling the front door usually is. Model residential code asks for 32 inches of clear width at 90 degrees on that one door, and a 24 inch leaf lands around 22 inches. Confirm with your authority which door they consider the required one before you buy anything.
No. An interior slab is built to a different thickness, with a different core, and with no weather line, no sill and no latching hardware. Where the opening sits in a fire separation, inspection guidance names a hollow core interior door as a common correction.
Both, and that is the whole problem. It is the first width in the commercial steel door standard, a normal interior passage width, a normal bifold closet width, and absent from residential exterior door lines. The word you attach to it decides which catalog you are in.
Only if the wall it sits in is rated or the opening is regulated, and that is a question for your authority, not for a shop. Where the model residential code does regulate a garage opening, it offers alternatives to a labelled fire door, so ask which constructions your jurisdiction accepts before you pay for a rating you may not need.
Because almost nothing in a door scales with width. The height, the hinge count, the lock prep, the frame, the jamb depth, the threshold and the wall all stay the same, and one of them, resistance to twist, gets worse.
Do not try to buy more glass out of a narrow door. Either widen the opening, which is a structural question, or keep the door narrow and put the glass beside it as a fixed lite in the same wall. Both are cheaper than a custom narrow glazed leaf, and neither asks a 24 inch door to do two jobs.
