Plan earlier to avoid redesign and permit delays. The 2026 Florida Building Code increases performance stringency, expands testing and documentation, and requires more coordination across the envelope, HVAC system, ducts, ventilation and selected compliance path.
Effective December 31, 2026
The 9th Edition (2026) Florida Building Code.
These are the changes most likely to impact Florida builders, HVAC contractors, architects, engineers and homeowners.
85% target for simulated performance projects, down from 95%.
R405.3
New Section R407 requires additional efficiency credits.
R407
Duct leakage testing exception removed. Ventilation feature and new report added.
R403.3.3, R403.6.3-R403.6.4
Reorganized Manual Soptions and capacity limits. More equipment documentation required.
R403.7.1 - R403.7.11
Lower U-factor and SHGC values for skylights and fenestration in both Florida Climate Zones 1 and 2.
R402.1.2, R402.1.4, R405.5.3.4
REScheck removed. Florida forms updated for the 2026 edition.
Chapter 8
A simple comparison of key residential changes.
Applies in Both Florida Climate Zones 1 and 2
The fenestration and skylight changes cover both Florida Climate Zones 1 and 2. Prescriptive and performance path criteria remain distinct.
Calcs-Plus provides Florida residential energy calculations, Manual J load calculations, Manual S equipment selection, Manual D duct design, mechanical plans and related building-performance support.
Our team helps builders, HVAC contractors, designers and property owners navigate the 2026 Energy Code requirements with accurate calculations and coordinated documentation for the applicable compliance path.
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