ADU DESIGN-BUILD
CONTRACTOR —
THE SF BAY AREA
Design-build means one team handles architecture, engineering, permitting, and construction. There is no handoff between an architect, a structural engineer, and a general contractor. One company coordinates all three — from the first site evaluation through final inspection.
For ADU projects, this matters. Accessory dwelling units require tight coordination between design decisions, structural requirements, and permit documentation. When those are managed separately, gaps form. Design-build closes those gaps before they become delays.
Design, engineering, permitting, and construction managed under one contract.
WHAT DESIGN-BUILD
ACTUALLY MEANS
Traditional approach: the homeowner hires an architect, who produces drawings. Those drawings go to a structural engineer. Then a contractor bids on the engineered plans. Three separate parties. Three separate timelines. Three separate scopes of responsibility. If the drawings don’t account for constructability, the contractor flags it after the permit is issued — and scope changes follow.
Design-build approach: one team manages design, engineering, and construction from the beginning. Architectural decisions are informed by structural and construction constraints from the start. Permit documentation is coordinated internally. There is no handoff, no reinterpretation, and no gap between what was designed and what gets built.
For ADU projects across Peninsula and East Bay cities, design-build reduces the coordination burden that falls on the homeowner.
One Contract
Design, engineering, permitting, and construction under a single agreement. No separate vendors to manage.
One Timeline
Phases overlap where possible. Engineering starts during design, not after it’s complete.
One Point of Contact
Questions, updates, and decisions go through one team. Communication is structured through Buildertrend.
One Scope of Responsibility
No finger-pointing between architect, engineer, and contractor. Accountability is clear.
WHY DESIGN-BUILD
MATTERS FOR
ADU PROJECTS
ADUs are smaller than full custom homes, but the permitting and engineering requirements are not proportionally simpler. A detached ADU still requires a full foundation design, structural calculations, Title 24 energy compliance, and coordinated utility routing. An attached ADU adds fire-rated assemblies and structural tie-ins to the existing home.
When design and engineering are handled by separate firms, the architect may not account for structural constraints. The engineer may not know the contractor’s construction sequence. The contractor inherits plans that don’t reflect site reality. Each disconnect creates a correction cycle — during plan check, during construction, or both.
Design-build eliminates these disconnects. Structural feasibility is confirmed during design. Permit documentation is assembled as an integrated package. Construction sequencing informs the design from day one.
What Design-Build Prevents
- Architectural plans that don’t account for structural requirements
- Engineering added after design instead of integrated with it
- Permit submittals with mismatched documents from different firms
- Construction change orders from unconstructable details
- Homeowners coordinating between architect, engineer, and contractor
- Scope gaps where no party takes responsibility
Design, engineering, and construction are coordinated from the first site visit.
PROJECT MANAGEMENT
& COMMUNICATION
Design-build only works if communication is organized. Every project runs through Buildertrend — a construction management platform that documents decisions, tracks phases, and keeps the homeowner informed without requiring constant check-ins.
You see what’s happening, what’s next, and what’s been completed. Selections, approvals, and schedule updates are logged in one place. No scattered emails. No missed updates. No ambiguity about project status.
For ADU projects that span design through construction, structured communication prevents the small misunderstandings that compound into delays.
What You See in Buildertrend
- Project schedule with phase milestones
- Design selections and approval tracking
- Daily logs and progress documentation
- Permit status and inspection results
- Change order documentation
- Direct messaging with your project team
THE DESIGN-BUILD
SEQUENCE
Every ADU project follows the same sequence. The difference with design-build is that each phase informs the next — because the same team manages all of them.
Site Evaluation & Feasibility
Setbacks, lot coverage, zoning eligibility, and infrastructure capacity are verified before any design begins.This step determines what’s buildable — not just what fits on paper.
Integrated Design & Engineering
Floor plans, structural design, and energy compliance are developed together. Construction constraints inform architectural decisions from the start.
Coordinated Permitting
All documents — architectural, structural, energy, site plan — are assembled and submitted as one complete package.Internal coordination means no mismatched documents across disciplines.
Phased Construction
Foundation, framing, rough utilities, inspections, insulation, and finishes proceed in sequenced phases with coordinated trade scheduling.
TRADITIONAL VS.
DESIGN-BUILD
The traditional model works for large commercial projects with dedicated owner’s representatives managing the process. For residential ADU projects, it puts the homeowner in the middle — coordinating between separate firms who don’t share a timeline or a contract.
Design-build removes that coordination burden. You aren’t managing the relationship between your architect and your contractor. You aren’t chasing down engineering documents from a third party. One team owns the outcome.
Traditional Model
- Homeowner hires architect, engineer, and contractor separately
- Plans are handed off between firms — gaps are common
- Permit submittals assembled from multiple sources
- Change orders arise when design doesn’t match construction reality
- Homeowner coordinates communication between parties
Design-build consolidates all three disciplines under one team and one contract.
ONE TEAM.
ONE PROCESS.
ONE OUTCOME.
- ✓ Homeowners who don’t want to manage multiple contractors
- ✓ First-time ADU builders who want a structured process
- ✓ Property owners who value organized communication
- ✓ Projects where permitting complexity requires tight coordination
“Most ADU problems aren’t construction problems. They’re coordination problems. Design-build solves that before the first shovel hits the ground.”
— Dan Mendez, Owner
DESIGN-BUILD ADU
PROJECTS ACROSS
NORTHERN
CALIFORNIA
Zoning interpretation, plan check processes, and inspection pacing vary by city. Our design-build approach accounts for city-specific requirements from the first site visit through final inspection.
ADU TYPES
WE DESIGN & BUILD
Every ADU type benefits from integrated design-build. The coordination requirements differ — but the model stays the same.
Detached ADU
Independent structure requiring its own foundation, utility connections, and full site planning from feasibility through construction.
Detached ADU DetailsJADU
Integrated into the existing home. Structural tie-ins, fire-rated assemblies, and foundation alignment require tight coordination.
JADU DetailsGarage Conversion
Existing footprint converted to habitable space. Slab evaluation, insulation, and code compliance managed under one scope.
Garage Conversion DetailsSTART WITH A
DESIGN-BUILD
CONSULTATION
One conversation covers feasibility, zoning, design direction, and construction approach. We evaluate your property and outline the full scope before any commitment — design through final inspection, managed by one team.
One team · One process · One point of accountability
Serving Palo Alto · Mountain View · San Mateo
Walnut Creek · Redwood City · the Bay