21st Century Home Improvement is a family owned and operated, licensed, and insured general contractor with more than 30 years experience in the home improvement industry. We operate throughout the Bay Area, including San Francisco, Marin, Alameda, Contra Costa, and San Mateo counties. Our main office is in San Francisco.
Our goal as a company is to serve the home improvement needs of homeowners by providing high quality, long lasting work and professional service. Our clients demand high quality work that will serve them well over the long term. One of our greatest strengths as a company is the wide range of home improvement services we offer. These include interior and exterior painting, roofing, window replacement, carpentry, remodeling, vinyl siding, and seismic retrofitting. We specialize in ADU’s and help navigate through the process start to finish from permits to completion.
We design and build bathrooms that balance comfort, durability, and clean design. From layout changes to tile, fixtures, and waterproofing, we manage the entire remodel with precision. The result is a bathroom that feels refined, functional, and built to last.
Our kitchen remodeling services focus on better flow, smarter storage, and long-term value. We handle everything from cabinetry and countertops to lighting, flooring, and finishes. Each kitchen is planned around how you actually use the space, not a one-size-fits-all design.
Finish carpentry adds the details that define the quality of a home. We install trim, molding, doors, built-ins, and custom woodwork with clean lines and tight tolerances. Every detail is measured, fitted, and finished with care.
New siding improves both curb appeal and structural protection. We install siding systems that are durable, weather-resistant, and appropriate for Bay Area conditions. Each project is completed with proper flashing, sealing, and attention to detail.
Replacing old windows improves energy efficiency, comfort, and noise reduction. We install high-quality windows with proper sealing and clean interior and exterior finishes. The upgrade delivers better performance without compromising your home’s appearance.
A reliable roof protects everything beneath it. We install and replace roofing systems built to withstand Bay Area weather while maintaining proper ventilation and drainage. Our roofing work prioritizes durability, safety, and long-term performance.
Exterior painting protects your home while enhancing its visual appeal. We prepare surfaces thoroughly to ensure strong adhesion and lasting results. The finished exterior looks clean, cohesive, and built to handle the elements.
We design and build accessory dwelling units that add living space and long-term property value. From planning and permits to construction and finishing, we manage the entire process. Each ADU is built to meet local codes while fitting seamlessly with your property.
Seismic retrofitting strengthens your home to better withstand earthquakes common in the Bay Area. We reinforce foundations and structural connections to reduce the risk of serious damage. The result is improved safety, code compliance, and peace of mind.
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