California PE-Licensed · Structural Design

ADU Structural Design
& Permit-Ready Plans

Detached ADUs, garage and JADU conversions, and additions — foundation, framing, and lateral design, PE-stamped and ready for plan check. We design the structure directly or work from your architect’s plans.

Schedule a free consultation (510) 288-9352

Completed detached accessory dwelling unit in a California backyard, shown from a three-quarter angle with entry door, windows, and full roofline visible.

Permit-Ready Stamped Plans

Structural drawings and calculations sized to clear city plan check.

Works With Your Team

We coordinate with your architect, designer, or existing plans.

Fast Turnaround

We commit to a delivery date in writing with your scope — no open-ended timelines.

Fixed Fee Where Scope Allows

Where the scope is clear, we quote a fixed fee up front — no hourly surprises.

What We Design

ADUs, conversions, and the structure that carries them.

We design the structural scope of your ADU project end to end — from the footing under a new detached unit to the shear wall that replaces a garage door opening.

01 · New Unit

Detached ADUs

Complete gravity and lateral design for new detached units on slab or raised foundation, coordinated to your site plan and setbacks.

02 · Conversion

Garage Conversions

Structural design for converting an attached or detached garage, including the header and shear wall work needed where the garage door opening is infilled.

03 · Conversion

JADUs

Junior ADU conversions within the existing footprint — new openings, partition changes, and any framing modifications the change of use triggers.

04 · Expansion

Additions & Second Stories

Vertical and horizontal additions, including the load path and lateral upgrades the existing structure needs to carry new area.

05 · Substructure

Foundation & Framing

Footings, slabs, stem walls, floor and roof framing, beams, and posts sized for the actual loads on your project.

06 · Lateral

Shear & Connections

Shear walls, hold-downs, diaphragms, and connection detailing designed per ASCE 7 and detailed for the field.

Project Photography

Recent ADU work

ADU under construction at the framing stage — stud walls and roof joists in place on a concrete slab foundation, with sill plate anchors and post base connectors visible.

Garage mid-conversion with the original garage door opening infilled — a new header spans the opening with new posts and shear panels framed at each end.

PE-stamped ADU structural drawing sheet on a plan bench, showing the foundation plan with footing and framing details and an architect’s scale alongside.

How It Works

From first call to permit approval, one engineer owns the structural scope.

01
Consultation

Free 15-minute call. We scope the work and confirm what the jurisdiction will require.
02
Site & Plan Review

We review your site, architectural plans, and any existing drawings or soils report.
03
Structural Design

Gravity and lateral design, member sizing, connections, and supporting calculations.
04
PE-Stamped Package

Permit-ready structural drawings and calculations, stamped by the engineer who did the work.
05
Plan-Check Support

We respond to plan-check comments and issue revisions through approval.

Code Basis

Designed to current code. PE-stamped.

Designed to the current California Building Code and IBC, with loads and seismic design per ASCE 7. Every drawing set and calculation package is stamped by a licensed California PE — the engineer who designs it is the engineer who stamps it.

Scope

What we provide — and what we don’t.

We provide structural engineering only. Architectural design, Title 24 energy, and MEP are handled by your architect or designer — we coordinate with them. We do not perform general contracting and we do not build the work.