Answer: 6-8 hours
Explanation: Depend on old 100A service typical 4 to 8 hrs
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| EDLab LLC |
Answer: 6-8 hours
Explanation: A 100-amp to 200-amp panel upgrade typically falls in the 6–8 hour range, even when you’re reusing the existing branch-circuit wiring. The added time comes from the utility requirements—especially in Sacramento, where SMUD or PG&E must send a service designer to confirm that the transformer and service area can support the increased load before the upgrade is approved.
Why it takes 6–8 hours
Utility design approval: SMUD or PG&E must verify that the transformer, service drop, and neighborhood capacity can handle the jump from 100A to 200A. This step happens before installation and can add days or weeks to the timeline, but the on-site work still reflects this requirement.
Full panel removal and installation: Disconnecting the old panel, mounting the new 200A panel, and transferring all circuits safely and cleanly.
Grounding and bonding upgrades: Most 100A homes need updated grounding electrodes, bonding jumpers, or service-entrance upgrades to meet current California Electrical Code.
Utility shutdown and reconnection: Coordinating with SMUD or PG&E for a same-day disconnect/reconnect window.
Inspection and compliance steps: Ensuring the installation meets CEC requirements and passes the city or county inspection.
Summary
Even with existing wiring reused, a 100A ? 200A upgrade is a full-day project once the utility designer has approved the load capacity. The physical work is typically completed in 6–8 hours, assuming no structural issues, mast repairs, or unexpected code corrections. |
| EcoWise Electric LLC |
Answer: 6-8 hours
Explanation: Too many factors to accurately say, but typically it will be a full work day. |
| G & H Electrical Services, LLC |
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| ProMatcher |
Answer: Not sure
Explanation: It depends on the complexity of the install |
| Light It Up Electric |
Answer: 2-4 hours
Explanation: Depending on the panel it takes anyou were from quarter 26 hours |
| Alltypes electric llc |
Answer: 6-8 hours
Explanation: Installing a new service and electrical panel usually takes about a day. |
| Ross Electric Company |
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| ProMatcher |
Answer: 6-8 hours
Explanation: Depending on the existing installation, is the service 200 amps or does it require a service upgrade? Is it hard piped as in commercial applications? |
| RAC Electrical Services` |
Answer: 6-8 hours
Explanation: There are many variables around this but typically can be completed in one day. |
| ElectriTech, Inc. |
Answer: Not sure
Explanation: Depends on what needs to be done. |
| Aegis Electric LLC |
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| ProMatcher |
Answer: 4-6 hours
Explanation: all jobs are different so could be longer or shorter |
| ELITE ELECTRIC SERVICES |
Answer: Over 8 hours
Explanation: You can not use 100 amp wiring on a 200 amp service what do you want to do burn the place down. More information is required is it over head or under ground grid connected |
| D B Electric |
Answer: 2-4 hours
Explanation: This requires communication with the power company, inspection department, and electrical contractor working together to ensure the power upgrade is done within code requirements and safety regulations. |
| Seabreeze Electric |
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| ProMatcher |
Answer: Not sure
Explanation: Cannot use existing wiring. Up the panel is upgraded to 200 amp than the meter and feeder wire must also be upgraded. |
| Kristoff Electric |
Answer: 4-6 hours
Explanation: I always tell people. Their ice won't melt in the freezer. Lol |
| Advanced Electrical and Energy |
Answer: 6-8 hours
Explanation: A service upgrade is an all day job requiring 1 man inside and 1 man outside plus co-ordinating with the power company |
| Jove Electric |
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| ProMatcher |
Answer: 6-8 hours
Explanation: 2 guys typically most of the day to change panel , meter, and riser. |
| DiBiagio Electrical Construction llc |