Get a Complimentary Multi-Unit Development Consultation

Book a complimentary 45-minute consultation with our principal architect to evaluate your property's multi-unit potential, from feasibility through approved permits.

Evaluate how many units your lot can support under current San Diego zoning and density bonus programs

Get ballpark costs for design, permitting, and construction based on your development scope

Walk through the permitting strategy, timeline, and regulatory incentives available for your specific property

20+ Multi-Unit Projects Designed

Duplexes, triplexes, bungalow courts, and developments up to 16 units on a single lot. We've designed multi-unit projects across San Diego's most active development corridors.

Integrated Design + Permitting

One team handles everything from feasibility analysis through approved plans. Our permit specialist spent years working inside San Diego's Development Services Department.

We've Been the Property Developer Too

Our principal architect has self-funded and developed multiple multi-unit projects on his own properties. We understand the ROI math because we've run the numbers on our own deals.

Featured Multi-Unit Projects

A selection of multi-unit developments we've designed and permitted across San Diego. From duplexes to bungalow courts, each project maximizes density without sacrificing livability.

Client Testimonials

See what our client’s have to say about working with us.

"Sean and Margaret Have One of the Best Teams in Town."

They gave wonderful ideas and took the time to listen to my ideas. All of the plan designs were done according to schedule and they always responded to my calls or emails. If you want a professional who is on time and truly cares about your project, look no further and hire them!”
Valerie O.

"Sean Is The Guy If You Are Looking For A San Diego Architect."

I was referred to him via a mutual business connection, and couldn't be happier with his work...The final product was phenomenal. I could not be happier. His work was not only exactly what I was looking for, but he did it in a timely fashion."
Alexandra G.

"I Highly Recommend this Company for Residential Architecture."

Ten Seventy Architecture was the architect for my wife and I's home in Mission Hills, CA. Sean went out of his way to provide a clear process from start to completion. Sean listened to our ideas and had even better ones for us to review and approve.
Curtis P.

"Ten Seventy Architecture Is Very Easy To Work With."

They ask the right questions and take your needs into account when designing and are able to produce layouts that are functional. Their team is knowledgeable, creative and spot on. I always look forward to working on projects with them, it’s a collaborative effort from start to finish. Keep designing smart.
Brenda W.

"Sean Is Very Easy To Get Along With, Very Knowledgeable And Professional."

I worked with Sean in the renovation of my East Village house that is 100 years old. He is skilled in creating small but creative and functional spaces and he is practical in solutions. We have another project now and we would like to work with him again.
Sonya O.

"An Element We Loved About Sean Was His Ability To See Creatively From The Very Beginning."

I can tell you that when we walked out of the meeting with Sean, we both looked at each other and said: “That’s the guy we want” And we’ve had no regrets ever since.
Tom R.

"Sean Canning Is An Amazing Architect."

As a landscape designer I have been on two projects transformed by his extraordinary design expertise. You should call Ten Seventy Architecture if you desire a vision for your home beyond anything you could have anticipated.
Brookside Landscape Design

They Are Very Professional And Just As Importantly, Very Creative."

"Working with the Ten Seventy Architecture team has been excellent. They have worked on various projects with us from our San Diego Penthouse to our Warehouse space."
Victor N.

Frequently Asked Questions

Common questions + answers about multi-unit development, density bonus programs, and building multiple ADUs in San Diego.

How Many Units Can I Build on My Property?

It depends on your lot size, zoning, and which density bonus programs apply. Many single-family lots in San Diego can support 2-4 units under current state law, and some qualify for significantly more through the ADU Home Density Bonus Program or SDA incentives. We'll evaluate your specific lot during the consultation.

What's the Difference Between a Single ADU and a Multi-Unit Development?

A single ADU is one additional unit on your property. Multi-unit development means designing 2-12+ units using a combination of ADUs, JADUs, and dwelling units, often configured as duplexes, triplexes, or bungalow courts. The budget, permitting strategy, and design complexity are fundamentally different from a single backyard ADU.

How Much Does a Multi-Unit Development Cost in San Diego?

Architecture fees for multi-unit projects typically start at $30,000+ for design and permitting, scaling with unit count and complexity. Construction costs generally range from $300-$450 per square foot. During your consultation, we'll give you ballpark ranges based on your lot and target unit count.

What Density Bonus Programs Are Available in San Diego?

The main programs include the ADU Home Density Bonus Program, Sustainable Development Area (SDA) incentives, and the state density bonus law. Each offers different unit count bonuses and regulatory concessions depending on your lot's location and zoning. We'll walk through which programs apply to your property during the consultation.

Do I Need to Include Affordable Housing Units in My Development?

Not necessarily. Some density bonus programs require affordable units, but strategies like the "Accessible ADU" bonus can help you avoid that requirement in certain cases. The answer depends on which programs you're using and how many units you're building. We'll cover this during your consultation.

Ready to Explore Your Property's Development Potential?

Book your complimentary 45-minute consultation with Sean Canning, our principal architect, and get a clear roadmap for maximizing your lot.