Location	North Park, San Diego, CA
ADU Type	Over-Garage ADU (Above-Garage Addition)
Size	780 sq ft
Layout	1 Bedroom / 1 Bath, Open Concept
Special Features	Accordion glass doors, private balcony/patio
Year Completed	2026
Total Cost	$324,000
Monthly Rent	$3,500/month
Annual Gross Income	$42,000/year
Permitted	Yes — City of San Diego
Use	Long-term rental

The Project

North Park is one of the most in-demand rental markets in San Diego. When these homeowners purchased their property, they noticed something most people overlook: a detached garage with a flat roof and enough setback to build on top of it. They called us before they'd finished unpacking.

The goal was clear — design a full ADU above the existing garage, match the modern aesthetic of the main house, and do it right. We designed a 780 sq ft, 1 bedroom / 1 bath unit with accordion-style glass doors opening onto a private balcony. It's fully permitted through the City of San Diego, and it now rents for $3,500 per month.

At a total build cost of $324,000, this ADU generates $42,000 gross per year. For a homeowner carrying a North Park mortgage, that's not just rental income — that's the difference between breaking even and cash-flowing positive.

"We always knew the garage had potential. We just didn't know it could look this good. It doesn't feel like an addition — it feels like it was always supposed to be there." — Homeowner, North Park · San Diego

The Challenge

Building above an existing garage isn't as simple as adding a second floor. The existing structure had to be assessed and reinforced to carry new load. We had to work within City of San Diego setback and height requirements while producing a unit that felt spacious — not like a box sitting on top of a car park.

The homeowners also had a non-negotiable design requirement: the ADU had to be cohesive with the main house. No rental-unit aesthetic, no visible disconnect from the street.

Project Timeline

This project ran approximately 12 months from first consultation to certificate of occupancy. Over-garage builds take longer than garage conversions — you're doing structural work, full framing, roofing, and exterior finish from scratch — but move faster than a detached ADU built on a new foundation.

The Cost

An over-garage ADU costs more than a garage conversion because you're building an entirely new structure — new framing, new roof, new exterior, new everything — on top of an existing base that has to be reinforced to carry it. This project came in at $324,000, fully permitted and move-in ready.

The main cost drivers for this type of build are structural reinforcement of the existing garage, full framing and roofing from scratch, and specialty items like the accordion glass door system. Anyone quoting you significantly less on a project of this scope either hasn't priced out the structural work, or is leaving things out of the contract you'll pay for later.

Want to know what your specific garage could cost? Get a free estimate →

Design & Permitting

Rummy Dechner led the design with a clear directive from the homeowners: match the existing home, not just work within the garage envelope. The floor plan placed the bathroom and laundry at the rear of the unit and opened the front living and kitchen area toward the balcony — making the most of natural light and the outdoor connection the accordion doors create.

The standout feature is the accordion-style glass door system, which opens the entire living wall to the balcony. At 780 sq ft, the unit can feel constrained if the layout doesn't work. With the accordion doors open, the space extends meaningfully — and it photographs well for rental listings, which matters.

Exterior materials and finishes were matched to the main house so the project reads as intentional from the street. That cohesion matters for property value and for what kind of tenant you attract.

The City of San Diego permitting process moved within the standard review window. A complete, well-prepared permit application — no missing sheets, no incomplete structural details — is the single biggest driver of permit speed. We've done this enough times to know exactly what the city's plan checkers are looking for.

Over-Garage ADU vs. Other ADU Types — Which Is Right for You?

The question we get often from San Diego homeowners who have a garage: which direction do I go? Here's the honest comparison:

Factor	Over-Garage ADU	Garage Conversion	Detached ADU
Typical Cost	$250K–$400K+	$100K–$180K	$250K–$450K+
Timeline	10–14 months	6–9 months	12–16 months
Size Potential	Limited by garage footprint + height rules	Limited by existing garage footprint	Up to 1,200 sq ft (per lot allowance)
Garage Use	Garage remains functional below	Garage is converted — parking lost	Garage unaffected
Foundation Work	Existing slab — reinforcement only	Existing slab — no new foundation	Full new foundation required
Rental Income Potential	$2,500–$4,000+/month	$1,500–$2,500/month	$2,500–$4,500+/month
Best For	Keep the garage, add a full ADU above it	Lower budget, faster timeline	Maximum size and design flexibility

Project Gallery

Over-Garage ADU — Frequently Asked Questions

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IL Total Design And Build · CSLB License #1058676 · San Diego, CA · iltotaldesign.com
Project completed 2026. Project details reflect actual scope and costs. Rental figures are current owner-reported. ADU rules and construction costs change — verify current requirements with your jurisdiction before committing to a scope. This page does not constitute a project bid or legal advice. Last updated: May 2026.