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CodesWise: Building Code Assistant

What is the minimum exit stair width for a residential building?

Exit Stair Width Requirements

For residential occupancy buildings, exit stairs must have a minimum width of 900 mm (35 7/16")1 under standard conditions. Where stairs serve a single dwelling unit, this reduces to 860 mm (33 7/8")2.

1 NBC 2025 · Sentence 9.8.2.1.(1) · pg 412

2 NBC 2025 · Sentence 9.8.2.1.(2) · pg 412

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Source Verified

NBC 2025 · Page 412

Features

Everything you need to navigate the codes

Stop flipping through thousands of pages. Whether you are an architect, contractor, building official, or developer, CodesWise finds the exact clause and puts the source right in front of you.

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Plain Language Queries

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Cited Answers

Every answer includes numbered citations linked to the exact sentence in the code. No guessing, no ambiguity.

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Inline PDF Viewer

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Full-Document Search

Search any keyword or article number across all pages of all four national codes simultaneously.

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Dual Unit Display

Every metric measurement is automatically accompanied by its imperial equivalent. No mental math required.

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Conversation Memory

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Why CodesWise

Built for professionals who cannot afford a wrong answer

General AI tools were not built for building code research. CodesWise is.

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General AI Tools

Answers from training data, not current code documents

No source citations, no way to verify the answer

May reference outdated or US-based code editions

Will fabricate plausible answers when source data is thin

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CodesWise

Searches the actual National Code documentation directly

Every answer fully cited to the exact article, page, and sentence

Built on the most up-to-date editions for your region

Answers restricted to the code only. No imagination, no fabrication

When your stamp goes on the drawing, a cited answer is not optional.

How It Works

From question to clause in seconds

CodesWise uses retrieval-augmented AI to search the actual code text. Not a summary, not a paraphrase. The real thing.

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AI Finds the Clauses

CodesWise searches all four national codes simultaneously, retrieves the most relevant passages, and generates a clear, cited answer.

Verify in the Source

Click any citation to open the original PDF document to the exact page, with the clause highlighted so you can verify and document your due diligence.

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✓ All current national codes (NBC, NFC, NPC, NECB)
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✓ Cited answers linked to exact clause
✓ Inline PDF viewer with yellow highlighting
✓ Dual metric/imperial display
✓ Full document keyword search
✗ No persistent conversation history
✗ No export or branding features

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