Home Additions & ADU Construction in San Mateo & the San Francisco Bay Area
HER Construction helps homeowners create more space, flexibility, and long-term value with professionally managed home additions and ADU construction services. Whether you are expanding your current home, building an accessory dwelling unit, or planning a custom addition for changing family needs, our team delivers quality craftsmanship, organized project management, and dependable service from start to finish.
We work with homeowners across San Mateo, San Francisco, the Peninsula, San Jose, Marin, and East Bay cities to build comfortable, functional spaces that are designed to fit your property and support the way you live.
Custom Additions & ADUs Designed for Modern Bay Area Living
Adding space to your property is one of the most effective ways to improve comfort, functionality, and long-term value. At HER Construction, we build home additions and ADUs with a focus on thoughtful planning, clean execution, and quality results. Whether you need more room for family, guests, rental income, a private office, or flexible living space, we help create solutions that feel natural, useful, and built to last.
Our team works closely with homeowners to ensure each project supports the layout and flow of the existing property while adding practical new space that enhances everyday living. From concept to completion, we focus on communication, craftsmanship, and a smooth construction experience.
Our Home Addition & ADU Services
HER Construction provides home expansion and ADU building services tailored to the needs of Bay Area homeowners. We focus on functional design, dependable project management, and high-quality workmanship throughout every stage of construction.
Accessory Dwelling Units (ADUs)
Build a detached or attached ADU that adds flexible living space, guest accommodations, or rental potential to your property.
Home Additions
Expand your existing home with thoughtfully designed additions that improve comfort, layout, and daily functionality.
Extra Bedrooms & Living Space
Add the room you need for growing families, multigenerational living, guests, or changing household needs.
Garage Conversions
Transform underused garage space into a more practical and valuable part of your property.
In-Law Units
Create comfortable, private living spaces designed for family members, guests, or independent use.
Custom Residential Expansion
Build new space that blends with your existing home while improving flow, function, and long-term usability.
More Space, More Flexibility, More Value
Home additions and ADUs can create new opportunities for the way you use your property. They can help support multigenerational living, improve day-to-day comfort, create more privacy, and add long-term value to your home. HER Construction builds these spaces with care so they feel connected, functional, and built for real life.
Flexible Living Space
Add space for family, guests, a home office, or changing lifestyle needs.
Property Value
Improve the overall usability and long-term value of your home with a well-built addition.
Rental Potential
ADUs can create additional income opportunities while expanding your property’s functionality.
Seamless Integration
We focus on additions that complement your existing home and feel naturally connected.
Home Additions & ADU Construction You Can Count On
HER Construction proudly provides home addition and ADU construction services in San Mateo and throughout the San Francisco Bay Area, including San Francisco, the Peninsula, San Jose, Marin, and East Bay cities. With experienced project management, skilled crews, and a strong focus on quality, we help homeowners build more space with confidence.