Will my ADU need fire sprinklers?

In most cases, if the main house doesn't have fire sprinklers, then the ADU won't be required to install sprinklers. However, there are some exceptions to that rule where sprinklers may be required:

• If you build an ADU larger than 50% of the main house
• If you build over a garage
• If the ADU is farther than a certain distance from the street (typically 150') or closest fire hydrant (typically 400')

Check with your local Planning Department and Fire Marshall for exact details once you've developed your project further.