Above-Garage ADU
Stack a second-story unit over your existing or new garage — full square footage without giving up an inch of yard.
Above-Garage ADU across Los Angeles, Orange & Ventura Counties.
Above-garage ADUs are the perfect answer for LA lots where the backyard matters and the front elevation shouldn't change. You get 500–1,000 sq ft of new living space overhead and keep every square foot of grass, garden, or pool below.
The engineering matters here more than in any other ADU type. HomeAdd's structural team assesses your existing garage foundation, walls, and roof to confirm the retrofit path — or we build the new garage below at the same time, sized to carry the ADU from day one.
Timeline is 7–10 months on site depending on whether we're building over an existing garage or new.
Ways homeowners use this addition.
Above existing garage (retrofit)
We reinforce the existing garage and stack the ADU above — best when the existing garage is structurally sound.
Above new garage (paired build)
Build a new garage sized to carry the ADU, then stack the ADU above. Cleaner engineering, permits together.
Studio above garage
400–500 sq ft one-room unit — the cheapest above-garage configuration.
1-bedroom above garage
The rental sweet spot — 600–750 sq ft with a real bedroom, bath, and kitchen.
2-bedroom above garage
800–1,000 sq ft — larger family or multi-generational unit.
Above-garage + storage loft
Split the ADU footprint with a small unconditioned storage loft accessible from below.
What's included in every HomeAdd project.
A realistic schedule, phase by phase.
- 1Structural assessment & feasibility3–4 weeks
Inspect existing garage, confirm retrofit path or new-build recommendation.
- 2Schematic design4–5 weeks
Floor plan, stair location, massing.
- 3Construction docs5–7 weeks
Engineering, Title 24, MEP, permit set.
- 4Plan check & permits8–12 weeks
Plan-check submittal, corrections, and permit issuance.
- 5Garage retrofit or new build3–5 weeks
Foundation reinforcement or new garage foundation and framing.
- 6ADU framing & envelope4–6 weeks
Floor system, walls, roof, exterior finishes.
- 7MEP & insulation3–4 weeks
Rough electrical, plumbing, HVAC, insulation.
- 8Kitchen, bath, finishes4–5 weeks
Cabinetry, tile, flooring, paint, fixtures.
- 9Final inspection & handoff1–2 weeks
Building final, address, punch list, warranty.
What it costs in LA, Orange & Ventura Counties.
Preliminary planning ranges vary by jurisdiction, site conditions, design, utilities, and finish level. A written proposal follows feasibility and design.
Studio ADU with garage retrofit — cheapest configuration when the existing garage passes assessment.
1-bedroom above retrofit garage with upgraded finishes.
New garage + ADU above, sized correctly from day one — often the smarter long-term investment.
Filed, corrected, inspected — by us.
We submit to LADBS, LA County DPW, and every OC and Ventura jurisdiction weekly. You never touch a portal, sit on hold, or drive to a counter.
- ADU permit (California's 60-day review timeline)
- Structural retrofit plan check
- Title 24 energy compliance
- MEP permits
- Stair & guardrail compliance
- Fire separation between garage and ADU
- Address assignment
- Final building inspection & CofO
What this scope typically looks like.
Representative planning images of the kind of build described above.
Answers we give on most first calls.
Still have questions? Call (877) 544-1543 or request a callback — a HomeAdd project advisor will walk your address on Google Earth with you on the phone.
Can my existing garage support a second story?+
About 60% of the existing garages we assess can carry an ADU above with retrofit. The other 40% are better served by rebuilding the garage sized correctly from day one. We tell you honestly in the structural walk.
Where does the stair go?+
Almost always on the exterior — indoor stairs eat too much ADU floor area and complicate fire separation. We show three or four exterior stair options in schematic design.
Is a fire-rated ceiling required between garage and ADU?+
Yes — a one-hour rated ceiling assembly, plus a fire-rated door on the stair landing. Standard in every above-garage ADU we build.
How much rent for an above-garage 1-bedroom?+
In the SFV and Westside, typically $2,700–$3,900/month. Above-garage units often rent slightly under detached but above interior conversions because tenants love the privacy of a separate entrance up the stairs.
Can we add a private deck?+
Sometimes — depends on setbacks and neighbor sight lines. When feasible, an 80–120 sq ft private deck off the ADU is highly rentable and visually softens the addition.
Should I do the garage and ADU together?+
If your existing garage is 30+ years old, has foundation cracks, or is smaller than what you want long-term, yes — new build + ADU is usually the smarter play. Do the hard part once.
Other ADU options for your lot.
Ready to plan your above-garage adu?
We'll walk your property, pull the zoning, and give you a real budget and timeline — before you spend a dollar on design.