Your Engineer. Your Contractor. One Accountable Partner.
Fewer handoffs. Fewer surprises. One point of accountability.
Led by Bahman Ghassemzadeh, PE, a California-licensed engineer and general contractor. Architectural plans, structural engineering, and full-service design-build for homes across Hillsborough, San Francisco, and the Peninsula.
We take on select residential projects for architectural plans, structural calculations, and structural plans, available independently or as part of our full design-build service.
Plans-only and engineering-only engagements welcome. We work with homeowners, architects, designers, and contractors—even when another team is handling construction.
BG Design Build is led by Bahman Ghassemzadeh, PE, who brings both engineering judgment and hands-on construction experience to your project. As a California-licensed engineer and general contractor, Bahman connects design decisions with structural requirements, construction costs, and how your home will actually be built.
You should not have to relay questions between a designer, engineer, and builder. We coordinate the design, engineering, permitting, and construction, including specialist consultants when needed. Fewer handoffs help us identify conflicts earlier, explain cost and schedule implications, and keep decisions moving. You have one point of accountability from early planning through the final walkthrough.
We work with homeowners in Hillsborough, Atherton, Burlingame, San Mateo, Redwood City, San Carlos, Woodside, and Portola Valley, as well as San Francisco and surrounding Peninsula communities.
CA Licensed Engineer · C-75941CA Licensed Contractor · 982312
We begin with a complimentary call to understand your goals. For most additions, custom homes, and substantial renovations, a paid feasibility study then explores design options, site constraints, permitting, budgets, and timing. We agree on the study’s scope and fee before work begins.
02
Design It
Building on the feasibility study, we develop architectural and structural drawings, coordinate consultants, and prepare permit submissions. We refine layouts, materials, and finishes alongside the construction budget, keeping design decisions connected to the practical requirements of your project.
03
Build It
Our team carries the design into construction, coordinating trades, scheduling, quality, and inspections. We keep you informed as work progresses and manage changes with you, maintaining a clear connection between the plans, the budget, and the finished home.
Our experience with local planning and building departments helps us identify requirements early, coordinate submissions, and address plan-check comments and inspection requirements throughout the project.
The BG experience
What you can expect.
01
Clear pricing, in writing.
Your proposal spells out the scope, inclusions, exclusions, and allowances. Proposed changes to the work and price are documented for approval before the affected work proceeds.
02
A schedule you can follow.
We outline the major phases, upcoming decisions, and expected milestones. When permitting, selections, or site conditions affect timing, we explain the impact and next steps.
03
One point of accountability.
Bahman leads your project as both engineer and general contractor. Design questions, structural decisions, and construction updates stay connected, with one responsible lead coordinating the team and next steps.
04
Care for your home and jobsite.
We plan dust control, floor protection, material storage, and cleanup around the work underway and any occupied areas. Site organization is part of the job.
Feasibility analysis
A clear direction before detailed design.
For most additions, custom homes, and substantial renovations, we start by analyzing what is possible, what may be required, and how the project fits your priorities. The feasibility study considers:
Preliminary floor plans and layout options
Addition, expansion, or reconfiguration possibilities
Site and zoning constraints
Structural and engineering considerations
Excavation, grading, or hillside conditions, when applicable
Planning and building department requirements
Preliminary construction budgets
Potential permitting challenges
Overall project timeline
The introductory call is complimentary. We then provide a written proposal for the feasibility study, with its scope and fee agreed before work begins. Layouts, budgets, and timelines are preliminary; full construction documents and any required specialist investigations follow as the project develops.
Ground-up custom homes designed to your specifications and built to last. We manage the entire process from site analysis through final certificate of occupancy.
Bedroom additions, second-story builds, and horizontal expansions—designed to feel like a natural part of your home.
Kitchen Remodels
Complete kitchen renovations with thoughtful layouts, custom cabinetry, considered lighting, and beautifully detailed finishes. We coordinate design, structural changes, building systems, and construction around the way you live.
Primary Suites & Bathrooms
Complete primary-suite and bathroom renovations with carefully planned layouts, custom millwork, stone and tile, and integrated lighting. We coordinate the design and construction of spaces made for comfort and lasting quality.
Complete home transformations, from structural reconfiguration to building systems and interior finishes. Our integrated team coordinates the full scope from design through construction.
What should you budget?
Explore preliminary construction ranges and what to plan for beyond the build.
“Worked with BG Design twice now for engineering services involving a home remodel, as well as the construction of a new outdoor (very large) pergola structure. … Highly recommend, will certainly use again for future needs.”
Start with a complimentary introductory call with Bahman, your licensed engineer and general contractor. Discuss your vision, project constraints, and next steps for your Peninsula home.
★★★★★
“We love the finished product—the quality and craftsmanship exceeded our expectations, and we're so proud of how our home turned out.”
