How Can I Tell If My Home Has 100 Amp or 200 Amp Service?

You can usually tell your home’s electrical service size by checking the main breaker rating inside your electrical panel.

Why Service Size Matters

The main breaker is typically labeled with a number such as 100, 150, or 200, indicating the amperage your home can safely handle. Many older homes in Austin and San Antonio still have 100-amp service, which may be insufficient for modern electrical loads.

Service size affects whether your home can support upgrades like new air conditioning systems, electric vehicle chargers, or additional circuits. If the label is missing or unclear, a licensed electrician can confirm the service size safely.

Radiant helps homeowners identify their service capacity and understand whether an upgrade is needed to support current or future electrical demands.

Frequently Asked Questions

When Should I Call An Electrician Instead Of Trying DIY?

You should call an electrician anytime you are dealing with wiring, breaker panels, power loss, burning smells, or repairs beyond basic fixture changes, since electrical work can be hazardous.

How Do I Know If My Electrical Panel Needs an Upgrade?

You may need an electrical panel upgrade if you experience frequent breaker trips, flickering lights, limited breaker space, or if your panel is outdated or undersized.

What Is the Average Cost to Replace an Electrical Panel?

The cost to replace an electrical panel varies based on panel size, home wiring, permits, and any required upgrades.

How Long Does It Take to Replace an Electrical Panel?

Most electrical panel replacements can be completed in one day, though timing depends on the scope of work and inspections required.

What Is an Electrical Panel (and Is It the Same as a Breaker Box)?

An electrical panel is the main distribution point for electricity in your home and is commonly referred to as a breaker box. The terms are often used interchangeably.