Disclaimer — Build Code Calculator

For Reference Only

The calculators on Build Code Calculator are provided for reference and estimation purposes only. Results are based on IRC 2021 model code requirements and are not a substitute for professional structural assessment, engineered drawings, or verification with your local building authority.

Building Code

All code references on this site are based on the International Residential Code (IRC) 2021. Your local Authority Having Jurisdiction (AHJ) may have adopted a different code edition, local amendments, or additional requirements that differ from the IRC. Requirements for egress, stairs, deck spans, and ceiling heights all vary by jurisdiction.

Always verify compliance with your local building department before starting construction or pulling a permit. These tools are not a substitute for a permit application or building inspection.

Structural Safety Note

⚠️ Deck joist spans, stair dimensions, and egress openings all have structural and safety implications. The span tables and code values in these calculators are based on published IRC 2021 data, but actual structural performance depends on lumber grade, species, moisture content, load conditions, and connection details. Always have structural work reviewed by a qualified professional where required by your jurisdiction.

Accuracy

Code values and span tables in these calculators are taken directly from IRC 2021. We make every effort to ensure accuracy, but make no warranty, express or implied, regarding the completeness or fitness for any particular purpose of the results produced.

If you find an error in a code value or span table, please contact us so it can be corrected.

Affiliate Links

Some pages on this site may contain affiliate links to products on Amazon, Home Depot, Lowe’s, or other retailers. If you click an affiliate link and make a purchase, we may earn a commission at no additional cost to you. Affiliate relationships do not influence calculator results or recommendations.

No Professional Relationship

Use of this site does not create any professional, advisory, or contractor relationship between you and the operators of Build Code Calculator. The information provided is general in nature and may not apply to your specific project or jurisdiction.