Service Guide

Garage Conversion to ADU

A practical guide to turning underused garage space into legal, high-value living space.

Why Garage Conversions Are Popular

Garage-to-ADU conversion is often one of the fastest ways to create independent living space because the structure already exists. That said, conversion projects still require full planning around insulation, fire/life safety, utility service, ventilation, and layout functionality.

Homeowners should expect both architectural and system-level updates. A garage is not originally built as conditioned habitable space, so key upgrades are required to support long-term comfort and code compliance.

Critical Planning Areas

Conversion success depends on evaluating slab condition, ceiling height, openings, drainage, and utility routing. Floor transitions, moisture management, and thermal performance must be considered early. Ignoring these items can lead to costly mid-project changes.

Design should also account for parking, access, privacy, and how the converted unit functions relative to the main residence.

Scope and Budget Transparency

Garage conversion quotes should clearly separate structural modification, MEP work, exterior envelope updates, and interior finish scope. Homeowners should receive written detail for each category so expected cost drivers are visible before construction starts.

Transparency is non-negotiable: no hidden fees, no vague line items, and no undocumented additions to scope.

Educational References

County of San Diego ADU Program Overview

City of San Diego ADU/JADU Bulletin (IB-400)

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