Alameda County · CA
Chimney sweep and repair in Alameda County’s Fremont and Union City
One crew, twenty miles from central Sunnyvale, covering the two Alameda County cities below.
No obligation. Someone answers every day, 7 a.m. to 9 p.m.
The short answer
In Alameda County, the twenty-mile radius Nation Wide Chimney Sweep & Repair works from central Sunnyvale reaches two cities, Fremont and Union City. Both were put together from older towns: Fremont from five in 1956 (Mission San Jose, Centerville, Niles, Irvington and Warm Springs) and Union City from Alvarado and Decoto in 1959. Both sit on the Hayward Fault, and most of their homes went up between the 1960s and the 1980s, so the work here is mostly on chimneys of that era: crowns and caps with decades of weather on them, flue liners, and the bracing question every older masonry stack on an active fault raises. One crew covers both cities with the same sweep, inspection, repair and cap work.
Local specifics
What is true about Alameda County
- 01
The Hayward Fault runs for nearly 50 miles through the East Bay, and the U.S. Geological Survey traces it through Fremont’s Central Park, where its slow creep offsets street curbs; the survey describes Fremont as very strongly shaken in the estimated magnitude 7.0 earthquake of 1868.
- 02
The same fault runs through Union City: a U.S. Geological Survey study of offset deposits near the Masonic Home there put its long-term slip rate at between 7 and 9 millimeters a year.
- 03
Alameda County has been in the Bay Area Air District since the district was formed in 1955, so its wood-burning rule covers Fremont and Union City; since October 2025 a mandatory burn ban is called when fine-particle pollution is forecast above 25 micrograms per cubic meter, down from 35.
- 04
Fremont was formed in 1956 when five townships, Mission San Jose, Centerville, Niles, Irvington and Warm Springs, came together, and Union City was incorporated in 1959, unifying the Alvarado and Decoto districts.
- 05
Census estimates put only 1.2 percent of Fremont’s housing units in buildings from before 1940, against 19.6 percent across Alameda County; the 1970s and 1980s together account for 45.2 percent of Fremont’s homes, and the 1970s alone for 30.5 percent of Union City’s.
Housing stock
What the housing stock means for the chimney work
Fremont and Union City are far younger than Alameda County as a whole. Census estimates put 19.6 percent of the county’s housing units in buildings from before 1940, but 1.2 percent of Fremont’s and 2.6 percent of Union City’s; in both cities most homes date from the 1960s through the 1980s. Chimney work here is therefore less about century-old lime mortar and more about chimneys of that era: crowns and caps with decades of weather on them, flue liners worth a camera, and, on the Hayward Fault, whether an unreinforced masonry stack is braced.
Founding towns: Mission San Jose · Centerville · Niles · Irvington · Warm Springs · Alvarado · Decoto
Approximate coverage; call to confirm a specific address.
Services here
What we do in Fremont and Union City
Reviews
What customers actually said
5.0
45 Google reviewscounted
- 547
- 40
- 30
- 20
- 10
counted
Kiara Harper
We recently purchased a 1920s Tudor and sought a Level 2 NFPA 211 examination. The tech didn't simply sweep he crawled into the attic to verify clearances against the roof framework, and documented everything in a crystal clear …
Tyler Warren
I was concerned about insurance requirements for the chimney. They performed a detailed inspection, provided a professional report with photos and video, cleaned the system, and made the small repairs needed. …
Jaxon Wells
The damper on our masonry fireplace became hard to open and close. During the service they lubricated the linkage, replaced the worn rope seal, adjusted the fit for tighter closure, cleaned the throat area, and polished the glass …
Maria Lear
Completed the full chimney cleaning today. Inspection revealed creosote glaze and some lint from the surrounding area. …
Cities in the county
Every city we serve in the county
Questions
What people ask about Alameda County
Which Alameda County cities do you cover?
Fremont and Union City, the two Alameda County cities inside our twenty-mile radius from central Sunnyvale, from Niles and Mission San Jose to Alvarado and Decoto. Call with your address and we will confirm whether it is covered.
Do Spare the Air alerts in Fremont or Union City stop chimney service?
No. The Bay Area Air District’s rule bans burning in a fireplace or stove while an alert is in effect; it does not restrict having one swept, inspected or repaired, so that work goes ahead on alert days.
Does a chimney on the Hayward Fault need seismic bracing?
An unreinforced masonry chimney this close to an active fault deserves a bracing check, and the Hayward Fault runs through both Fremont and Union City. We check for it on every inspection.
What can go in when a Fremont or Union City fireplace is remodeled?
Under the Air District’s rule, a fireplace or chimney remodel that needs a local building permit and passes the rule’s cost threshold may only install a gas-fueled, electric or EPA-certified device, and new construction may not get a wood-burning device at all.
Are burn bans called more often than they used to be?
They are called at a lower pollution level. In October 2025 the Air District lowered the forecast that triggers a mandatory burn ban from 35 to 25 micrograms of fine particles per cubic meter, so a ban now comes on days that would not have qualified before.
Book a visit in Fremont or Union City
Tell us your city and what you have noticed, and we will confirm the right service.
Or call (888) 698-8416, every day, 7 a.m. to 9 p.m.