Accessory Dwelling Units (ADU)
An Accessory Dwelling Unit is one of the most versatile additions you can make to your property, whether you're creating space for family, adding rental income, or increasing your property’s long-term value. At Cornerstone Residential Design, Ted provides precise, code-compliant ADU plans tailored to your site, your goals, and local jurisdiction requirements. With over 40 years of building and inspection experience, Ted ensures your ADU design is functional, efficient, and ready for engineering, permitting, and construction.
Types of ADUs Designed
Cornerstone Residential Design offers drafting and design services for a variety of ADU types, including:
Detached ADUs (DADUs)
Attached ADUs
Garage conversion ADUs
Above-garage ADUs
Basement conversions
ADUs designed for multigenerational living
Compact or efficiency-layout ADUs
Each ADU is designed with thoughtful use of space, efficient layouts, and practical construction solutions that align with requirements like setbacks, height limits, utility access, and parking regulations.
How the Process Works
1. Initial Consultation
A $100 consultation allows Ted to review your property goals, zoning considerations, and feasibility for your preferred ADU type.
2. Written Estimate
You’ll receive a detailed estimate outlining projected hours for the full design, engineering coordination, and permitting support if needed.
3. Project Start
Work begins once the 50% non-refundable deposit is received and cleared. This also reserves your project in Ted’s schedule.
4. Preliminary Design
Ted develops your initial ADU layout and conceptual design, including floor plans, roof plan, and any conversion considerations if applicable.
You’ll review and refine the design via email until a finalized layout is approved.
5. Working Drawings
After approval, Ted prepares complete construction-ready plans suitable for:
Engineering review
Permit submission
Builder bidding
Construction in the field
6. Engineering & Permitting
Ted coordinates with a licensed structural engineer if required.
Permitting assistance is available upon request and billed hourly.
7. Final Deliverables
Final plans are delivered as PDFs (printed sets available upon request).
All invoices must be paid before drawings are released.
Why Homeowners Choose
Cornerstone Residential Design
Extensive expertise with zoning, code, and structural requirements for ADUs
Clear, practical design solutions that maximize space and functionality
Thoughtful layouts for comfortable small-footprint living
Reliable coordination with engineering
Accurate plans that reduce construction delays and costly surprises
Transparent, organized communication from start to finish
Start Your Project with Confidence
Let’s create a design that’s practical, precise, and built to last.