Commercial HVAC in Hayward, California
What does a rooftop unit swap need in Hayward?
A building permit, PDF plans through the city's portal and, for a rooftop unit on the existing curb, an engineer's structural calculations. The rules for commercial HVAC change-outs in Hayward.
On file for Hayward
A commercial change-out, by the city's checklist
On file, last checked 2026-10-22
Read next
-
Permit
Does replacing a commercial HVAC unit need a permit in Hayward?
Yes. A building permit is required to remove and replace an HVAC unit, or to install one for the first time.
Source: City of Hayward, Commercial HVAC System Replacements. Rules and programs change: last checked 2026-10-17.
-
Structure
When does a rooftop replacement need an engineer?
Hayward asks for structural calculations and/or details, stamped and signed by an engineer, documenting that the existing roof framing will support the new unit and the curb attachment will resist lateral loads.
The city's reason is printed in capitals on its form: code changes for seismic resistance.
Source: City of Hayward, Commercial HVAC System Replacements. Rules and programs change: last checked 2026-10-17.
-
Economizer
Does the new rooftop unit need an economizer?
Above a size, yes. Hayward's change-out requirements note that Units > 54MBH require an economizer.
Source: City of Hayward, HVAC Change-Outs submittal requirements (revised 9-8-25). Rules and programs change: last checked 2026-10-22.
-
Paperwork
How are plans submitted in Hayward?
As PDF files through the City of Hayward E-Permit Portal. Paper submittals are not allowed.
Source: City of Hayward, HVAC Change-Outs submittal requirements (revised 9-8-25). Rules and programs change: last checked 2026-10-22.
Where we work
The Peninsula line
Our shop is in San Mateo. Every stop below is a city we work in, from San Francisco's neighborhoods down to Gilroy, over to the coast and across to the East Bay. The stops in white have their own page.
- Our shop, San Mateo
- A city with its own page
- We work there too
Along the Bay and El Camino
The hills
- Emerald Hills
- Woodside
- Portola Valley
- Stanford
- Los Altos Hills
- Los Altos
- Cupertino
- Monte Vista
- Saratoga
- Monte Sereno
- Los Gatos
- Campbell
The coast
Tell us what it's doing. We'll take it from there.
Call and describe the problem: the noise, the smell, the room that never warms up. Or book a visit online.
