Structure and slab
Review framing, foundation and floor conditions; ask whether moisture, settlement or prior changes call for specialist input.
ADU path · garage conversion
Garage conversion construction starts with the shell.
Turning an existing garage into an ADU is construction work, not just a finish update. KB Remodeling considers the slab, framing, openings, envelope, utility connections and permit history before defining what can be retained and what must change.
Discuss a garage conversion
01
Read the existing garage
The opportunity is reuse; the risk is assuming the existing structure already meets the needs of a dwelling.
Height and openings
Measure clear interior height and existing door/window openings. Plan daylight, ventilation and access against the proposed layout.
Services and envelope
Investigate water, sewer, power, insulation and thermal comfort. The path to the garage matters as much as the work inside.
Permit history
Check records for the existing garage and any earlier conversion or addition; document differences between records and reality.
02
The tradeoff behind reuse
Less new footprint, not necessarily less work
A reusable shell may simplify parts of site work, but remediation, new openings and utility upgrades may offset that advantage.
Main-house disruption
Plan access, staging, parking changes and how construction affects people living in the primary house.
From garage to approved living space
- 01
Document the shell
Measure and photograph the garage; collect records and identify visible damage.
- 02
Investigate feasibility
Review structural, utility and layout questions with qualified professionals as appropriate.
- 03
Design and submit
Prepare plans for the responsible authority; resolve corrections before relying on a construction sequence.
- 04
Build, inspect, close
Coordinate the retrofit and applicable inspections; keep closeout records.
Garage conversion decision checklist
- Is the garage permitted as built?
- What is the clear height and slab condition?
- Where could kitchen and bath services connect?
- What site access remains during construction?
- What existing storage or parking use changes?
Questions an assessment should answer
- Existing-condition record
- Structural and moisture concerns
- Utility routing assumptions
- Conceptual living layout
- Agency and consultant questions still open
Planning resources for your ADU
Start with California guidance and the building department responsible for your property. Requirements depend on the site and jurisdiction.
Conversion questions
Can any garage become an ADU?
Not automatically. The existing slab, walls, roof and fire separation must be evaluated, and the space needs code-compliant light, ventilation, egress, insulation and utility service.
Is replacement parking required when converting a garage?
State ADU law limits when a local agency may require replacement parking for a garage converted into an ADU. Confirm how your agency applies those rules to your property.
What costs are specific to a garage conversion?
Raising or leveling the slab, adding insulation and a moisture barrier, replacing the garage door with a wall and windows, upgrading the electrical service and adding plumbing for a kitchen and bath.
Is an existing garage automatically eligible?
No. Eligibility and design depend on the parcel, the existing structure and applicable review. Confirm records and conditions before treating it as a dwelling.
Will the slab and roof stay as they are?
Only an assessment can answer that. Moisture, structure, height and the proposed openings may require changes.
Compare other paths
Prepare your project brief
Keep the property questions, priorities and your own figures together before reaching out.
Open the planning studio ↗KB Remodeling · Greater Los Angeles