National Building Code of Canada 2020

Code compliance,
precisely engineered.

A deterministic rule graph applies the NBC 2020 to your drawing set. Every verdict cites the exact article and PDF page. Same drawing in — same result out.

Start a compliance check Browse the rule library

LLMs in the verdict path: 0; LLMs in the verdict path
Verdict categories: 4; Verdict categories
NBC Parts covered: 3 + 9; NBC Parts covered
Verdict to citation: 1:1; Verdict to citation

run / a3f7c1d2

Part 9 · 5 checks

NBC 9.8.4.1.Pass
Private stair riser height
172 mm ≤ 200 mm
NBC 9.8.4.2.Pass
Stair tread depth
235 mm ≥ 210 mm
NBC 9.8.4.3.Fail
Minimum stair width
required 860 mm · 820 mm provided
NBC 9.9.3.3.Info N/A
Public corridor width
corridorWidthMm not provided
NBC 9.10.14.Uncertain
Spatial separation
flagged for human judgement

Reproducibility hash pinned to drawing revision

The determinism boundary

A model never decides
whether you comply.

Language models help read a drawing. They are structurally incapable of issuing a verdict here — the pass/fail path contains no model at all. That boundary is the product.

See every encoded rule

May assist

Extraction & retrieval

Reads room schedules, door tags and assemblies off the sheet
Surfaces relevant NBC passages when a rule needs human judgement
Every extracted value stays editable before a check runs

Human-confirmed. Never authoritative.

hard boundary

Decides alone

The SHACL rule engine

Applies every applicable NBC 2020 shape to the submission
Emits one of exactly four verdicts, with the parameters it used
Deterministic: no sampling, no temperature, no drift between runs

The only thing that can author a verdict.

The output

Four verdicts. Never a fifth.

Most tools collapse missing data into a pass. This one refuses to — a rule it could not evaluate is reported as exactly that, so nothing silently slips through review.

Does Not Meet

A rule applied, the data was present, and the submission violates it.

Uncertain

The rule needs human judgement. Routed to a reviewer — never auto-decided.

Information Not Available

A required parameter is missing. Explicitly not a pass.

Meets

The rule applied, the data was present, and the submission conforms.

Suite

Everything a plan reviewer needs.

Explore the platform

Compliance check

Upload a PDF drawing set. Facts are extracted into editable records, the rule engine fires, and you get an itemized report — every line traceable to its NBC article, PDF page and rule id.

FailUncertainInfo N/APass