What is Florida R405? +
The Simulated Performance path in the Florida Building Code, Energy Conservation. Instead of meeting a prescriptive checklist item by item, your house is modelled in approved software and compared against a code-minimum version of the same house. If the proposed design uses no more than 95% of the baseline's energy, it passes.
Why use the performance method instead of prescriptive? +
Because it lets you trade off. If you want more glazing than prescriptive allows, or you've already committed to a particular window or equipment package, R405 lets you make up the difference elsewhere instead of redesigning. It's usually the cheaper route on a house that isn't a simple box.
Is it only for new homes? +
No — additions and renovations can use the performance path too, and it's often the more forgiving option on an existing building where you can't change everything. Send the scope and we'll confirm it's the right path before you order.
What's included in the submittal? +
The Form R405 report with its summary page and pass status, an input summary checklist your inspector can field-verify against, HVAC sizing per Manual S, the EPL display card, the Air Barrier and Insulation Inspection checklist, and the envelope leakage test report form — plus the duct leakage test report form where the design calls for it.
What is the EPL display card? +
The Energy Performance Level display card, which Florida requires to be included as an addendum to the sales contract for the home. The building official checks that it matches the plans you submitted. It's a Florida-specific item and it's easy to miss — we include it.
What information do you need? +
Floor plans and elevations, window and door schedule with the glazing specs, wall, roof and floor assemblies, and your proposed HVAC and water heating equipment. Orientation matters in Florida, so tell us how the house sits on the lot, or we'll model worst-case.
How long does it take, and what if it doesn't pass first time? +
Most residential projects are back within 24 hours and commercial projects within 24–48 hours. If the first run doesn't pass, that's normal — we adjust the model and tell you the cheapest way to get it over the line rather than just handing you a fail. Revisions after plan review comments are included.
Can Manual J be added? +
Yes, and on a Florida project it's worth doing together. R405 requires equipment sizing per Manual S, which depends on a Manual J load. Doing both at once keeps the numbers consistent between your energy model and your mechanical submittal.
