Building regulations: Building regulations
United States: International Residential Code 2018
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- Category
- Building regulations: Building regulations
- Kind
- Regulation pack
- Languages
- None provided. The words are as the provider wrote them.
- Author
- CadCraft
- Version
- 3, published Oct 27, 2026 Published
The model code: numbers and section numbers entered from the IRC 2018 text in ICC's free viewer, checked 2026-10-27. A model code is not law until a state or city adopts it; pick your state's pack to check against what applies there.
License
CC0CC0 1.0 (public domain dedication). Anyone may use, change and share it for any purpose, with no conditions. Credit is welcome but not required.
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Regulation pack
Draft: entered from the published code, not yet reviewed by a professional. The model code: numbers and section numbers entered from the IRC 2018 text in ICC's free viewer, checked 2026-10-27. A model code is not law until a state or city adopts it; pick your state's pack to check against what applies there.
- Place
- United States
- Pack id
us-irc-2018- Edition
- IRC 2018
- Authority
- Model code
- Source date
- 2017-08
- Last checked
- 2026-10-27
- Source
- International Code Council, International Residential Code 2018
| Rule | Clause | Required |
|---|---|---|
| Riser height | R311.7.5.1 | At most 196.85 mm |
| Tread depth | R311.7.5.2 | At least 254 mm |
| Stair width | R311.7.1 | At least 914.4 mm |
| Stair headroom | R311.7.2 | At least 2,032 mm |
| Handrail height | R311.7.8.1 | 863.6 mm to 965.2 mm |
| Ceiling height Simplified: the code has exceptions for beams, sloped ceilings and basements. | R305.1 | At least 2,133.6 mm |
| Glazing, share of floor area Simplified: lighting by artificial means is allowed in some rooms. | R303.1 | At least 8 % of the floor area |
| Openable area, share of floor area Simplified: mechanical ventilation is allowed instead. | R303.1 | At least 4 % of the floor area |
| Habitable room floor area Every habitable room; kitchens are exempt. Floor under ceilings lower than 5 ft (sloped) or 7 ft (furred) does not count. | R304.1 | At least 6.503 m² (70 sq ft) |
| Habitable room least dimension In any horizontal direction; kitchens are exempt. | R304.2 | At least 2,133.6 mm |
| Hallway width | R311.6 | At least 914.4 mm |
| Egress door clear width One side-hinged egress door per dwelling unit; clear width with the door open 90 degrees (the checker estimates it as the leaf width less 2 in). | R311.2 | At least 812.8 mm |
| Egress door clear height Clear height from the top of the threshold to the bottom of the stop. | R311.2 | At least 1,981.2 mm |
| Escape opening net clear area Every sleeping room (and basements, habitable attics). Grade-floor openings may be 5.0 sq ft. The checker estimates the clear opening from the window type. | R310.2.1 | At least 0.53 m² (5.7 sq ft) |
| Escape opening clear width Net clear opening width. | R310.2.1 | At least 508 mm |
| Escape opening clear height Net clear opening height. | R310.2.1 | At least 609.6 mm |
| Escape opening sill height Measured from the floor to the bottom of the clear opening. | R310.2.2 | At most 1,117.6 mm |
A guide only: the registered professional and the local authority decide. A pack holds numbers and clause numbers, never the standard's text. The Building regulations add-on in BimCraft checks drawings against it.
Versions
All versions| Drawing | Version | Change | License | Status | Published |
|---|---|---|---|---|---|
| Version 3 | DataUpdated from the add-on's pack (a99b6b6dc182). | CC0 | Published | Oct 27, 2026 | |
| Version 2 | DataUpdated from the add-on's pack (23c31d239152). | CC0 | Published | Oct 27, 2026 | |
| Version 1 | GeometryFirst version, from the Building regulations add-on's pack. | CC0 | Published | Oct 27, 2026 |
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