Ceiling Height Calculator — IRC R305 Requirements

Room details

Enter your room measurements below — diagram updates live

IRC R305

Code standard

Diagram updates as you enter measurements below

Room type

Ceiling type

Ceiling height — feet

At lowest point

Inches

🛒 Raising a ceiling? Check out materials:

Home Depot Lowe's

⚠️ Codes reference IRC 2021 Section R305. Some jurisdictions adopt local amendments — verify with your local AHJ before construction. Commercial buildings follow IBC with different requirements.

→ Also check wall insulation compliance at rvaluecalculator.com

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