Custom ADUs Built In San Diego
Detached backyard homes, attached suites, and luxury garage conversions — designed and constructed for the way you actually live.
Why Build an ADU in San Diego?
An ADU is the most direct way to add functional, valuable square footage to your San Diego property. Whether the goal is multigenerational living, a private home office, long-term rental income, or a guest residence, a well-designed ADU works as both a daily-use space and a long-term financial asset.
Recent California legislation has made ADUs faster to permit and easier to finance than at any point in the last decade. San Diego ministerial approval pathways mean most homeowners across La Jolla, Encinitas, La Mesa, North Park, Coronado, and Carlsbad can move from concept to construction in a fraction of the time a traditional addition would take.
Three Paths to Adding an ADU
Every site, budget, and timeline is different. We help you choose the right approach from day one.
Detached New Build
A purpose-built home in your backyard, separated from the main residence. Maximum design flexibility, full privacy, and the highest long-term value. Best for larger lots and clients building for the long term.
Attached Addition
A new wing or second-story unit that shares a wall with your primary residence. Lower foundation cost, stronger thermal efficiency, and seamless flow with the existing home.
Garage Conversion
Transform an existing attached or detached garage into a fully permitted ADU. The fastest path to occupancy and typically the lowest cost-per-square-foot route to a high-value rental or guest unit.
Designed and Built by Lumina
Every ADU we deliver is fully custom — drawn, engineered, and built in-house by the same team that constructs our luxury main-home remodels. No catalog plans. No franchise crews. No compromises on the finishes that matter day to day.
From the first site walk to the final punch list, you work with a single point of contact at Lumina. We handle architectural drawings, structural engineering, Title 24, permitting, and every trade so you never get stuck managing the gap between consultants.
Our ADU Process
Five clear stages, from first conversation to handing you the keys.
Consultation
On-site walk through your property. We discuss goals, budget, and feasibility, then map out which ADU type fits your lot best.
Design
Schematic plans, 3D renderings, finish selections, and a fixed-scope construction proposal — all reviewed and approved before you commit.
Permitting
We submit and manage every permit through the City of San Diego, the County, or your local jurisdiction so you never chase paperwork.
Construction
Site prep, foundation, framing, MEP, and finish work executed by Lumina's in-house team and our long-standing trade partners.
Move-In
Final inspection, certificate of occupancy, walkthrough, and a one-year workmanship warranty on the completed ADU.
Investment, Rent Potential, and Financing
Most San Diego ADUs we build land between $300,000 and $700,000 fully turnkey — depending on size, finish level, and site conditions. Garage conversions typically come in lower; detached new builds with luxury finishes typically come in higher.
On the income side, a well-built two-bedroom detached ADU in coastal North County can rent for $3,500 to $5,500 a month long-term, which positions most projects for full payback in six to ten years and meaningful resale lift well beyond that.
We can connect you with construction lenders, ADU-specific financing products, and HELOC partners who routinely fund our clients'' projects.
Frequently Asked Questions
How long does it take to build an ADU in San Diego?
From signed contract to certificate of occupancy, a detached ADU typically runs eight to twelve months — roughly three months in design and permitting and five to nine months in construction. Garage conversions move faster, often three to five months total.
How big can my ADU be?
State law currently allows detached ADUs up to 1,200 square feet by right on most single-family lots, with attached ADUs sized as a percentage of the primary residence. San Diego ADU Bonus Program incentives can permit larger units in qualifying areas. We confirm specific limits during the consultation walk.
Do I need to add parking when I build an ADU?
In most cases, no. Under current state law, parking is waived for ADUs within a half-mile of public transit or in many existing San Diego neighborhoods. We verify the parking requirement for your specific address during feasibility.
Can I rent out an ADU short-term?
San Diego restricts short-term rentals (under 30 days) on ADUs in most neighborhoods. Long-term rentals (30 days and over) are permitted. We always advise confirming with current STRO licensing rules before banking on a short-term-rental income model.
What does an ADU cost in San Diego?
Lumina ADU projects generally land between $300,000 and $700,000 turnkey. Garage conversions can come in below $200,000 with the right scope. Final pricing depends on size, finish level, structural condition of any existing structure, and utility connections. We provide a fixed-scope proposal before you commit.
Will an ADU increase my property taxes?
Only the new construction value is reassessed for tax purposes — your existing home base stays at its current Prop 13 assessment. Most owners see a modest tax increase tied to the new ADU square footage and finishes, not a re-evaluation of the whole property.
Do I have to live in the main house if I build an ADU?
Owner-occupancy is currently not required for standard ADUs in California through 2025, although JADUs (Junior ADUs) do require it. This rule has shifted in recent legislative cycles, so we always verify current state on the day we open your permit.
What ADU Clients Say About Lumina
San Diego homeowners trust Lumina with their most personal projects — and they tell the story better than we can.
Ready to Start Your ADU?
Schedule a no-cost feasibility consultation. We will walk your property, review your goals, and outline what is possible — with no pressure to move forward.
