Santa Rosa is the largest city in Sonoma County and the North Bay, with steady residential and ADU activity in a mild climate.
Santa Rosa sits in Climate Zone 2 — an inland North Bay valley climate with warm summers and cool winters, where window performance and insulation are primary factors in your energy model. We model every Santa Rosa project using CEC-approved software and the climate zone for the project address.
Title 24 reports for Santa Rosa city projects are submitted to the City of Santa Rosa building department. Sonoma County projects go through Sonoma County. We serve both and format every report for the correct local jurisdiction.
We prepare Title 24 reports for all project types in Santa Rosa:
- New single-family home construction
- Room additions of any size
- ADUs and Junior ADUs including garage conversions
- Remodels and alterations affecting insulation, windows, or mechanical systems
- Multifamily duplexes, triplexes, and fourplexes
- HVAC replacement projects
- Window replacement projects
We also serve Petaluma, Rohnert Park, Novato, Napa, and the surrounding area.
Title 24 Projects in Santa Rosa
Santa Rosa's building activity has been shaped by wildfire. After the 2017 Tubbs Fire and later fires in the area, neighborhoods such as Coffey Park and Fountaingrove saw widespread rebuilding, and fire-rebuild projects remain a distinct category of work here. A home rebuilt after a fire is treated as new construction for energy purposes, so it needs a full Title 24 performance model — including solar PV where it applies — even when the new house closely follows the old floor plan.
Outside the rebuild areas, Santa Rosa's older neighborhoods near downtown and its postwar and newer subdivisions generate the familiar mix of ADUs, junior ADUs, additions and remodels. Larger lots on the edges of the city and in unincorporated Sonoma County are well suited to detached ADUs.
Climate Zone 2 is a mixed climate: warm, dry summer days and cool nights and winters. Both heating and cooling show up in the model, which is one reason heat pumps are a common choice. Homes in wildfire-prone areas may also need to meet Chapter 7A construction rules; those come from the California Building Code and are separate from the energy report. See new construction Title 24 reports and Title 24 requirements.
Region, climate zone and nearby cities
Santa Rosa is part of our Bay Area and Northern California coverage. The CEC uses Santa Rosa as the reference city for Climate Zone 2, and your ZIP code sets the exact zone for your project. We also serve Windsor, Sebastopol and Healdsburg.
