Home / Learn / OBC code matrix builder

Free tool · Beta

OBC code matrix builder

Find out which Part of the Ontario Building Code applies to your project, then prepare a Part 3, 9, 10 or 11 data matrix step by step. Then export it as a PDF or DXF. A free drafting aid, not professional advice.

Draft – under construction · not verified · not for permit use

Step 1

Before you start

A free drafting aid for Ontario Building Code data matrices. Please read this first.

This tool helps you organize information for an OBC data matrix. It is not a code review, a design, or professional advice.
Results depend entirely on what you enter. Automatic checks are preliminary draft rules and may be incomplete or wrong.
Definitions are plain-language summaries. The official Ontario Building Code (2024 Building Code) governs.
A matrix submitted with a permit application must be prepared or reviewed by a qualified designer (BCIN holder, architect or engineer) as the Code requires.
Not affiliated with or endorsed by the Ontario Association of Architects or the Province of Ontario.
Your entries stay in your browser. Nothing is sent to LA Design or stored. Refreshing the page clears them.

I understand, and I accept the Terms of Use. LA Design Inc. accepts no liability for the use of this tool or its outputs.

Step 2

Which Part of the Code applies?

Answer five quick questions. We will suggest the matrix, and you can still choose any of the four.

1. What kind of project is it?

2. What will the building be used for?

Select every major occupancy (use) in the building.

3. Building area, m²

Largest footprint above ground, final building.

4. Storeys above grade

Basements below the first storey do not count.

5. Post-disaster building?

Has the existing building existed for 5 years or more?

Part 11 is for renovating buildings that are at least five years old.

Existing major occupancy

Suggested matrix draft rule

Matrices to prepare

All four are available. The suggested one is pre-selected.

Step 3

Project data

Entered once. These values fill every matrix you selected, and later the plumbing and energy sections.

General

Project name

Project address

Municipality

Prepared by

BCIN / licence no.

Date

Short project description

Dwelling units (final)

Occupancies

Superimposed major occupancies?

Areas, m²

For existing buildings, enter only the part that will remain. Existing + new = final building.

Height

Storeys above grade

Storeys below grade

Height, m

Streets faced

Site & climate

Heating degree days

Sa(0.2)

Wind pressure 1/50, kPa

Climate zone (SB-12)

— draft rule

Step 4

Code matrix

Rows marked Auto come from your project data. Fill in the rest. Tap i to see what an item means.

No.	Item	Details	OBC reference	Status

Step 5

Review & export

Check the results, choose the matrices, then export. Every export carries the disclaimer and the draft watermark.

Checks

Municipal resources

Include in export

PDF

Letter landscape. Choose “Save as PDF” in the print window. One matrix per page set.

DXF (AutoCAD / Revit)

Table drawn in mm at 1:1 on layers MATRIX-GRID / TEXT / NOTE. Open in AutoCAD and save as DWG if needed.

Before you submit: have a qualified designer review the matrix. Check every value against the official 2024 Ontario Building Code.

© LA Design Inc. Drafting aid only, provided “as is” without warranty, and not a substitute for professional review. The Ontario Building Code (O. Reg. 332/12, as amended – 2024 Building Code) governs. Not affiliated with or endorsed by the OAA or the Province of Ontario. Terms of Use · Privacy Policy