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Home Addition in Berkeley

Berkeley Home Additions

Thoughtful design-build additions that respect Berkeley’s historic charm while modernizing your living space.

From expanding a classic Craftsman bungalow to engineering a multi-level addition on a steep hillside, we build spaces that respect your home’s original architecture. By keeping design, engineering, and construction under one roof, we eliminate the costly miscommunications that often plague major home expansions.

Growing Your Footprint in Berkeley

No two Berkeley additions are alike. A rear extension on a flat Elmwood lot requires strict adherence to historic preservation guidelines, while a Berkeley Hills addition demands complex structural engineering to manage slope and seismic safety. We tailor our architectural strategy entirely to the era, style, and topography of your specific residence.

Seismic and Structural Upgrades

Adding mass to older Berkeley homes frequently triggers the need for seismic retrofitting. We calculate these shear wall and foundation requirements upfront, avoiding mid-project engineering delays.

Strict Zoning and Setback Laws

Berkeley has rigorous neighborhood zoning ordinances. We map out your property lines and floor-area-ratio limits immediately to ensure our proposed designs will breeze through the planning department.

Honoring Historic Details

Adding onto a historic property requires an artisan’s touch. We replicate original rooflines, custom millwork, and window proportions so the new wing is indistinguishable from the century-old structure.

Minimizing Household Disruption

We know that living next to a construction site is tough. We prioritize your family’s comfort by establishing secure dust barriers and sequencing the heavy framing to minimize the impact on your daily routine.

Home Addition Process

1. Initial Site Visit: 1 to 1 ½ hrs

Every home addition begins with a clear understanding of your existing home and how you want it to grow. We start with an on-site walkthrough to evaluate current conditions, understand your goals, and discuss how the new space should function, feel, and connect to the rest of the home. By listening closely to your vision, questions, and budget, we help shape an addition that feels intentional, well-integrated, and built for long-term comfort.

On-site walkthrough to evaluate the existing structure, site conditions, and how the addition can best integrate with your home
We provide a free ballpark construction cost range for the addition, for example $180k – $240k, based on size, complexity, and scope
To move forward, we execute a preconstruction agreement (PCA), covering architectural coordination, engineering, and permit planning
Home addition design can range from straightforward expansions to highly complex projects, depending on structural constraints, zoning, and client selections

2. Design & Material Selection: 1 -2 months

Once the vision is clear, the design process puts it all on paper. Every detail is considered, from the countertops, to cabinet layout, to lighting, we will figure out every last detail. A thorough design phase is key to staying on budget.

In-depth consultations for all project goals and design considerations.
Some common design goals include careful layout for cabinet use, best lighting options, countertop / flooring selection as well as overall colors, finish fixtures.
The contractor creates an all-inclusive list of all project selections for client review, which will be used to guide the project.

3. Permitting: 2 - 3 months

Once the design is complete, it’s time to submit the plans to the city for approval! This can take a few months, but during this time you can still keep the project moving! While most product selections will have already been considered, this is the time to actually start shopping for certain items, in most cases top on that list is tile to allow for precise layout of fixtures, niches, and other elements that may be involved.

4. Construction: 1 - 4 months

Finally, our team begins with a careful protection of your surrounding areas. Dust barriers with zipper doors, HEPA air filtration, and floor protection are some of the methods we implement to ensure your home and family are protected from the process. A dedicated project manager and construction team will carry out the work in close coordination with the homeowner, providing clear communication, organized scheduling, and day-to-day oversight to keep the project running smoothly and predictably.

5. Move In

Once final city inspections are approved, we complete a detailed walkthrough of the new addition to confirm all work, systems, and finishes are complete and performing as intended. We then review and deliver all close-out documentation, including manuals and warranties, and provide a long-term maintenance overview to help ensure the addition integrates well and performs for years to come.

Our Home Additions

A look at recent Home Additions work from Beyond Green Construction.

What Our Clients Say About Us

Ready to start planning your Berkeley Home?

FAQ

You Ask We Answer

What types of home additions do you specialize in? +

We specialize in primary suite additions, kitchen and family room expansions, second-story additions, detached structures, and complex structural expansions that require a high level of coordination and craftsmanship.

Will you manage permits and inspections? +

Absolutely. We handle permitting, coordinate with local jurisdictions, and manage inspections to keep the project compliant and moving forward smoothly.

Do you handle City of Berkeley permits for home additions? +

Yes, we completely manage the City of Berkeley’s notoriously strict planning and building department requirements, acting as your sole representative.

How do you protect the rest of the home during construction? +

We implement site protection, dust control, and clear access planning to minimize disruption. Respect for the existing home is a core part of our construction standards.

How do you match the new addition to our older home's style? +

We take a deeply custom approach, cataloging your home’s existing architectural language—from rafter tails to baseboards—and specifying identical or highly complementary materials for the addition.