Home Additions & ADUs
Need more space? Angel Suarez Construction builds room additions, second stories, and detached or attached ADUs for homeowners near San Bruno.
A home addition adds new space to your house. An ADU, or accessory dwelling unit, is a small second home on your lot, either attached or fully detached. Both give you more room to live, work, or host family. The right choice depends on your lot, your budget, and how you want to use the space.
What is a home addition or ADU?
A home addition grows your current house. You might add a bedroom, a bigger kitchen, or a whole new floor on top. An ADU is a separate small home on the same lot. It has its own kitchen, bath, and door. People build them for family, guests, a home office, or rental income. Both add real square footage and value.
Room additions and second-story additions
A room addition builds out from your home on the ground. It works well when you have side or backyard space. A second-story addition builds up instead of out. It keeps your yard and adds a full floor of bedrooms or a suite. Second stories need a strong foundation and structural base, and we may add seismic bracing to keep the home safe. We match the new roofline and roof to your existing house.
Detached and attached ADUs
An attached ADU shares one or more walls with your house. A detached ADU stands on its own, like a small backyard home. Attached units often cost less because they share the foundation and some utilities. Detached units give more privacy and a separate front door. We build both, with full kitchens, bathrooms, and their own entrances.
How do I know if my lot can fit an ADU?
Most single-family lots in California can fit an ADU. State law now makes approval easier for homeowners. What matters is your lot size, the setbacks from your property line, and access for the crew. We add energy-smart doors and windows so the new unit stays comfortable and quiet. We visit your home, measure the space, and tell you honestly what will fit.
How we build your project, step by step
We start with a free visit and a written estimate. Then we draw the plans and handle the city approvals for you. After that, our crew builds, from the foundation to the last coat of paint. The same crew stays with your project from start to finish, so you always know who to call. Angel Suarez Construction has built additions and ADUs across the Peninsula since 2021, under California license #1085926. See all of our remodeling and construction work, or start from our home page.
Best Home Additions and ADUs in San Bruno
We are a local general contractor serving San Bruno and the wider San Francisco Peninsula. We know the older homes and small lots here, and the city rules that come with them. Because we work nearby, we can visit fast, answer your questions in person, and stand behind the work. We also serve close cities like San Mateo. For additions and ADUs in San Bruno, that local care is what sets us apart.
Why choose Angel Suarez Construction?
- Fully licensed and insured for your protection.
- Upfront pricing you approve before any work starts.
- Serving San Bruno, South San Francisco, San Mateo, Burlingame, Millbrae, San Francisco and surrounding areas.
Related services
- Seismic Retrofitting, Angel Suarez Construction strengthens older homes against earthquakes with code-approved bolt-and-brace, cripple-wall, and soft-story retrofits across the San Francisco Peninsula.
- Concrete & Foundations, Licensed concrete and foundation work on the San Francisco Peninsula: new foundations, driveways, patios, walkways, and stamped or colored concrete, poured to last.
- Roofing, Roof replacement and repair for Bay Area homes in shingle, tile, metal, and flat low-slope. Handled by a licensed general contractor, with honest cost ranges shared up front.
Explore our full range of Remodeling & Construction, or head back to the Angel Suarez Construction home page.
Cost of home additions & adus in San Bruno
Published 2026 remodeling cost guides put a Bay Area room addition around $200 to $500 per square foot, and a full ADU near $150,000 to $400,000. These are market ranges, not our quotes. Your written estimate is always free.
What moves the price:
- Size and how many rooms you add
- Foundation work and whether you build a second story
- New plumbing, electrical, and utility hookups
- An attached addition or a detached ADU
- Finishes, cabinets, and fixtures you choose
- Lot access and site prep
Every job is different, so we give you an exact price up front, and you approve it before any work starts.
How it works
How our home additions & adus process works
Get your free estimate
Call or request a quote online. We'll take a look and give you an honest, upfront price, no pressure.
We schedule your job
Pick a time that works for you. We show up when we say we will and keep you in the loop the whole way.
Done right, the first time
Clean, quality general contractor, and we leave your property better than we found it.
Get a free estimate for home additions & adus
Call now or request a free estimate, we'll get right back to you. Emergency service available.
Licensed & insured · No obligation
Find us
San Bruno, CA area
FAQ
Home Additions & ADUs, common questions
Where can I find home additions and ADUs near me in San Bruno?
Angel Suarez Construction builds home additions and ADUs in San Bruno and across the nearby San Francisco Peninsula. We are a service-area contractor, so we come to you for a free on-site visit and written estimate. Call us or fill out the form to set up a time. We will look at your space and show you what is possible.
Is it cheaper to add onto my house or build a detached ADU?
In most cases, an attached addition costs less per square foot than a detached ADU. It shares your home's walls, foundation, and some utilities. A detached ADU costs more but gives a private, separate unit. Published 2026 cost guides put Bay Area additions around $200 to $500 per square foot. Those are market ranges, not our quotes, and your estimate is free.
How does getting an ADU approved in California work?
California has made ADU approval much simpler for homeowners. You submit plans to your city, and the city reviews them against state and local rules. We handle this whole step for you. We draw the plans, apply for the permits, and answer the city's questions. That way you avoid the paperwork and delays that stall many projects.
How long does it take to build a home addition or ADU?
Most home additions take about two to four months to build once permits are approved. A full ADU can take three to six months, depending on size and foundation work. Permit review adds time before that, and it varies by city. We give you a clear schedule with your estimate, so you know what to expect from day one.
Can I rent out an ADU in California?
Yes. California law lets homeowners rent out an ADU in most cases, which is why many owners build one. An ADU can bring rental income or house family close by. Local rules can still apply, so we point you to the current requirements for your city. We build each unit with a full kitchen, bath, and its own entrance.
Need home additions & adus?
Call now or request a free estimate, we'll get right back to you. Emergency service available.
Licensed & insured · No obligation