A larger home, without compromise.
Architecturally integrated, light filled, truly functional.
Tailored details, enduring value.
Home Addition Contractor in the East Bay, CA | Taragano
Taragano Design and Build is a licensed design-build contractor, CSLB #1143420, serving the East Bay and Contra Costa County with home additions from 500 to 4,000 square feet, master suites, second stories, kitchen expansions, and full new wings. Architecture, structural engineering, and construction all run through a single team and one contract, so nothing gets lost between the drawing and the framing. Taragano has built more than 100 projects across the East Bay since 2014, backed by Diamond Certified and BBB accreditation and a one-year workmanship warranty on every job.
Your family grew. Your home did not. When we’re done, no one can tell where the old house ends and the new one begins.
Get Your Free Home Addition Site VisitWhat We Build
Master Suites
A true retreat: bedroom, spa bath, and walk-in closet. The most requested addition in the East Bay, built for daily living, not just resale.
Second-Story Additions
Your lot is full, but your home can grow up. We built a two-story addition in Berkeley with two new baths and a deck. Going up costs more per square foot than building out, since it adds structural load to the existing foundation, but it saves the yard.
Kitchen and Great-Room Expansions
Push out the back wall. Open the kitchen to a great room full of light. This is the addition that changes daily life the most, and it’s also the addition type that tends to hold its value best at resale.
In-Law and Guest Suites
A private space with its own bath and entry. Perfect for parents, guests, or grown kids. Want a full second home with its own kitchen? That is an ADU, see our ADU page.
Full Extensions and New Wings
Some homes need serious space. Our largest additions push past 4,000 square feet and involve full civil, structural, and design coordination from the ground up.
Home Additions We’ve Completed in the East Bay
A full addition and remodel in Walnut Creek. A two-story addition in Berkeley. Additions and full remodels in Orinda, Pleasant Hill, Concord, and San Francisco. More than 100 projects across the East Bay since 2014.
What Determines a Home Addition Cost?
No two additions cost the same, because no two homes are the same. What’s already there matters as much as what you’re building.
Ground-floor additions generally cost less than going up, since a second story adds structural load to an existing foundation that may need reinforcement, along with new framing, plumbing, and electrical runs through occupied space below. Tying the new structure into the old one is where the real complexity lives, matching rooflines, siding, and window lines so the addition doesn’t look bolted on, and confirming the existing foundation and framing can actually support what’s being added.
Size and finish level matter too, but structure comes first. A modest addition on a foundation that needs no reinforcement is a very different project from the same square footage requiring new footings, a header beam, or a full re-route of existing plumbing.
This is why we walk your home and confirm what your existing structure can support before design ever begins.
How It Works
The First Call or Email
Tell us what you’re picturing, a master suite, a second story, a kitchen expansion, or a full new wing. We ask about the property and your timeline, then schedule a free site visit if it’s a fit.
The Site Visit
We check your lot, setbacks, and existing structure, foundation, framing, roofline, and siding, since everything the addition ties into has to be confirmed before we can design against it.
Design and Permits
We prepare architectural plans, structural engineering, and Title 24 energy documents. Going up a story means confirming the existing foundation can carry the added load, sometimes requiring reinforcement. Tying the new roofline, siding, and windows into the old ones so the addition doesn’t look bolted on is worked out here too, before anything is submitted.
Proposal and Permit Submittal
Our construction team reviews the full scope in detail and prepares a clear proposal. Once you review and approve it, we submit for permit and handle every question that comes back from the city.
Construction
Three dedicated crews, each led by a licensed general contractor, build the project with weekly updates. We protect the rest of your home during construction and close with a final walkthrough and a one-year workmanship warranty.
Why Taragano for Your Home Addition
Additions fail in the gaps, when an architect draws something the builder can’t actually build on the existing structure. We close that gap ourselves, the same architects and engineers work with us on every project, so what gets drawn is what we can actually build, before it ever reaches the city.
Taragano holds a 5.0 rating on Google and Houzz and ranks among the top home addition contractors in the East Bay, in BuildZoom’s top 2% of California contractors. Licensed under CSLB #1143420, bonded, and insured.
Already have approved plans? We’re glad to build from them, which typically reduces your design costs since that phase is already done.
Home Additions by City
We build home additions across the East Bay and Contra Costa County. For local rules, permits, and projects, see the five cities we focus on. Each link goes to that city’s home additions section.
Common Questions about Home Additions
How long does an addition take?
Design and permits take three to six months in most East Bay cities. Construction adds four to eight months, based on size.
Can we live at home during construction?
Usually, yes. We seal the work zone with dust barriers, protect your floors, and clean the site daily.
Will the addition match our house?
Yes. We match rooflines, windows, siding, and trim. Or, if you prefer, we give the whole home a fresh, modern face.
Do you handle the permits?
Yes, all of them. Zoning, building, and every inspection along the way.
Is a second story or a ground-floor addition better?
It depends on your lot, your budget, and your plans. We walk you through both options at the site visit, with the specifics for your property.
Ready for More Room?
Call or text (925) 388-6353 for a free site visit. We serve Danville, Lafayette, Orinda, San Ramon, Walnut Creek, Concord, and the greater East Bay.
