ADU design
Garage conversion with the garage door kept
By the HyreADU research desk. Last checked .
The short answer
A garage conversion with the garage door kept is possible only if the door assembly meets the rules for a home.
The wall must meet the energy code for insulation and air leakage, the unit needs a proper entry door, and sleeping rooms need code-compliant escape openings.
Many owners replace the door with an insulated glass door system that looks like a garage door.
Why most conversions remove the door
A standard roll-up garage door is built to close a garage, not to insulate a home. Once the space is habitable, the energy code applies to its walls and openings, as California’s Title 24, Part 6 does for a home. A door that cannot meet those values has to be replaced or infilled.
Options that keep the look
- An insulated, glazed sectional door rated for the energy code, where your designer can show compliance.
- A fixed glass wall framed to look like garage panels.
- Folding or sliding glass doors that open the room to a patio.
- Infill with a wall, window and a small porch, keeping the trim line of the old door.
Rules the opening must meet
- Energy compliance for the assembly (California: Title 24, Part 6).
- A separate, code-compliant entry door for the unit.
- Emergency escape openings in sleeping rooms (IRC R310 as adopted).
- Any local objective design standards for street-facing walls.
A mistake to avoid
The mistake to avoid is counting the garage door as the entry or the escape route. Inspectors usually expect a standard entry door and escape openings sized by code. Ask your designer to show how each requirement is met on the plans before you order a door.
What to do next: check your lot with the ADU feasibility checker, read the questions to ask an ADU builder, then tell us about your project. Matching is not live yet, so we reply with information, not a quote.
Get ADU optionsQuestions
Can I keep my garage door in an ADU?
Only if the assembly meets the energy code and the other rules. Many do not.
Does California require removing the door?
No statute requires removal; the energy and building codes decide whether it can stay.
Is a glass garage door allowed?
If it is rated and shown to comply with the energy code on your plans.
Does the city care how it looks?
Some cities apply objective design standards to street-facing walls.
Sources
- California Energy Commission, 2025 Building Energy Efficiency Standards (Title 24, Part 6). Checked September 5, 2026.
- International Residential Code 2021 (R305 ceiling height, R310 emergency escape). Checked September 5, 2026.
- Gov. Code § 66314 (ADU standards: parking, setbacks, sprinklers). Checked September 5, 2026.
HyreADU is a publisher. It does not design, permit or build ADUs, has no partner builders, and gives no legal, tax, lending or engineering advice.
Rules vary by state and city; California rules are labeled as such. Spotted an error? Tell us through our corrections page. Licensed professionals can also contribute as named sources.