Standards
Every calculator names the documents its formula comes from. Read the other way round, each document has a list of calculators that depend on it — 17 documents, 130 dependencies, generated from the registry rather than maintained by hand.
Each page states what the document governs and where to obtain it. None reproduces any part of the text, and none claims that any jurisdiction has adopted it.
Adoption not verified for your jurisdiction. This site holds no adoption record for any authority, so what is in force where you build has to come from your building department.
That is not a gap waiting to be filled in quietly. Adoption is a claim about law: each authority adopts on its own timetable, usually several editions behind publication and usually with local amendments, so a stale effective date on a page somebody reads before a planning meeting is worse than saying nothing. A jurisdiction may only appear here alongside a public source a reader can open and the date somebody read it — and until one does, the number of authorities this site can speak for is 0.
The measurable half is this site’s own citations. 2 of 132 code citations, across 77 calculators and 16 documents, name the edition they came from. The other 130 name a document and a section — “NEC 240.6(A)” rather than “NEC 2023 240.6(A)” — which is enough to find the provision and not enough to know which text you are looking at. Counted from the registry on every build rather than maintained by hand.
Separately from the citation graph, four standards publish a scale rather than a formula — how corrosive an atmosphere is, how wet a timber’s service situation is, how durable a species is untreated, and what a treated piece is exposed to. Those are set out, and compared, on their own page.
9 bodies · 17 documents
Publishes the model building codes most of the United States adopts — the I-Codes — and a smaller set of numbered standards alongside them. A model code is a draft for legislatures, not law in itself.
Publishes the National Electrical Code and the fire and fuel-gas codes. Its documents are model codes and standards; jurisdictions adopt them selectively.
Publishes the Uniform Plumbing and Mechanical Codes, adopted across much of the western United States where the ICC codes are not.
Publishes test methods and material specifications. A code becomes specific by referencing one: "tested to ASTM E119" is how a fire rating is defined.
Publishes the concrete design code and the practice documents the trade works to. ACI 318 is referenced by the building codes; the guides are good practice rather than law.
Publishes the specification for structural steel buildings and the section property tables the trade sizes steel from.
Publishes the loading standard — wind, snow, seismic and live loads — that the building codes reference for what a structure must resist.
Publishes the residential load, duct and equipment-selection manuals — Manual J, D and S — which several codes require HVAC design to follow.
Publishes the Approved Documents, which give practical guidance on meeting the Building Regulations for England. Following them is one way to comply, not the only way.
