> ## Documentation Index
> Fetch the complete documentation index at: https://docs.loft.build/llms.txt
> Use this file to discover all available pages before exploring further.
# Door
```loft theme={"theme":{"light":"github-light","dark":"github-dark"},"languages":{"custom":["/languages/loft.json","/languages/loft-fragment.json"]}}
door DBL-9070 D1 in wall.W1 at 4' swing right
```
Sill is inherited from the opening interface and defaults to the host level; a door may raise it (`sill 6"`), and drop it once the anchor spelling lands. Kinds contribute selectors over the jamb pair (and, where geometry demands, their own placed datums).
**Placement:** hosted, as the opening interface's — `in wall.W1 at 4'`; see [opening](/categories/opening/) for the station vocabulary.
## Parameters
| Word | Accepts | Required | Meaning |
| ----------------------------------- | ------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `type`
`DBL-9070` | a doortype | instance · required | the doortype, leading the statement — it fixes or delegates width and height |
| `in`
`in wall.W1` | a wall | instance · required | the host wall |
| `at`
`at 4'` | length | instance · required | the station along the host, from its start — or from a reference (`past` / `short of`), landing `to jamb`, `to jamb.far`, or `to centerline`
the station's reference words are their own rows — `past`, `short` — and the value is a length along the host, so `door.D1.jamb.far + 2'` composes here |
| `past`
`past grid.A` | plane (normal xy) | instance · optional | the datum the station measures forward from |
| `short`
`short of grid.B` | plane (normal xy) | instance · optional | the datum the station measures back from
spelled `short of`: `at short of ` |
| `width`
`width 3'-0"` | length | bound | the clear width — every door has one; the type fixes it or delegates it (`instance`) to each placement |
| `height`
`height 7'-0"` | length | bound | the clear height — every door has one; the type fixes it or delegates it (`instance`) to each placement |
| `u-`
`u-fire-rating "90"` | length or boolean or text | bound | job-specific data, one row per name (`u-fire-rating`): fixed on the type, or delegated (`instance [required]`) and supplied per placement |
| `sill`
`sill 3'` | length | instance · required · default: the host level + 0'
**practice** — a hole with no sill is a passage, the commonest opening of all — decision 84; the window refines `sill` to required with no default (decision 82, D0272) because a 0' window sill is never intended | the bottom of the opening, up from the host level
`sill 3'` reads as `sill + 3'`; a value below the level is legal (the anchor spelling that writes one is parked — PARKINGLOT "ẑ anchors everywhere"). |
| `swing`
`swing right` | `left` · `right` | instance · required · default: right
**practice** — decision 82 left "required?" open; the owner (2026-09-10) left it as the default with no requiredness ruling | the hinge side, in the host wall's from → to frame |
| `reverse`
`swing left reverse` | flag (the bare word) | instance · required · default: off
**revit-parity** — Flip Hand unchecked | open the other way — the hardware handing (`swing left reverse` = LHR), a suffix on `swing` |
### Reserved
| Word | Rung | Meaning | Arrives with |
| ----------------------- | -------- | --------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------- |
| `fire-rating` | type | the assembly's fire rating — drawn, not just scheduled (NCS ships nine fire-rating linetypes) | the `duration` value type (`90 min`, `2 hr`) — every parameter value carries units; until then the corpus spells it as text, `u-fire-rating "90"` |
| `hardware-set` | type | the hardware set the leaf carries | the door worksheet — `u-` today, a built-in candidate then |
| `head-height` (derived) | instance | the head's height above the level — sill + height (Revit's Head Height) | the derived-parameter era |
| `kind` | type | which kind of leaf the type is — the category's declaration lists them | a second kind of leaf — the door's and the window's declarations list what is coming (D0242) |
| `label` | instance | what the tag prints when it is not the id | a bubble or tag printing text other than the id — the grid's bubble is the one that ships |
| `phase` | instance | the phase this element is created in | the phasing era — phases are an ordered list declared in their own file, and a view looks at the model as of one |
| `demolished` | instance | the phase this element is demolished in | the phasing era — phases are an ordered list declared in their own file, and a view looks at the model as of one |
## Datums
Inherited from [opening](/categories/opening/): `centerline` / `cl`, `head`, `sill`, `jamb` (pair), `jamb` / `jamb.near` / `jamb.far`.
| Datum | Shape | Status | Resolution | Rule |
| ----------------------------------- | ----- | --------------- | ----------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `hinge` | plane | core · swinging | operational | The swing-side jamb, by the `swing` declaration (`swing right` hinges at the jamb nearer the wall's `to` end; `left` mirrors — the renderer's rule, now the format's). Rehang the door and `hinge` follows to the other jamb, dependents in tow. Default = swing-side jamb; a family may override with a placed datum (pivot doors — the axis really is off the jamb). |
| `strike` | plane | core · swinging | operational | The opposite jamb, same declaration. |
| *(sliding/pocket, bi-fold, double)* | — | reserved | operational | Each future kind names its own selectors in the spec (fixed/operable side, stack side, active-leaf edge) — never ad hoc. Referencing an absent kind's selector is a teaching error naming the element's actual set. |
## Roles
`elevation-swing` · `frame` · `glass` · `hardware` · `opening` · `panel` · `swing` · `threshold`