Prefab & Modular ADU Installers in San Diego
Skip the long construction delays. Compare 45 builders prefab and modular ADU companies serving San Diego. Install in weeks, not months.
45
Contractors
$3K
Average Rent /mo
$974K
Avg Home Value
Featured Builders
ADU builders serving San Diego
HSP ADU Builders
Room & ADU Builders San Diego
Johnny General Contractor ADU
Top Investment Neighborhoods
Highest rental yields in San Diego by ZIP Code
ZIP 92014
Highest Return
ZIP 92130
ZIP 92121
ZIP 92037
ZIP 92139
ZIP 92115
ZIP 92131
ZIP 92127
Top ZIP Codes by Rent in San Diego
Neighborhoods with the highest average rental rates
92014
92130
92037
92139
92131
92115
92127
92129
92122
92108
San Diego Real Estate Market
Easy to understand market data to help you make informed ADU investment decisions.
Based on aggregated market data from multiple housing platforms and public records
Average Rent
Monthly rental price
$3K
Average Home Value
Property valuation
$974K
Market Analysis
San Diego shows strong rent growth of 2.3% over the past 12 months. Home values have changed by 3.6%, making ADU investment a strategic choice for homeowners.
Projected Property Value
Current market analysis for San Diego indicates a 1.5% increase in property values over the next 12 months.
Similar Cities to San Diego
Cities with similar market characteristics for comparison
California State ADU Standards
These are the guaranteed rights for homeowners in San Diego under California State Law. Local agencies cannot enforce stricter standards than these baselines.
State law prohibits local agencies from setting limits below 850 sq. ft. (1 bd) or 1,000 sq. ft. (2 bd). Generally, up to 1,200 sq. ft. is allowed subject to setbacks.
Local agencies cannot require rear or side setbacks of more than 4 feet.
Minimum allowed height limit. Some areas allow up to 18-25ft depending on proximity to transit or main house.
No parking required if ADU is within 1/2 mile of public transit, historic district, or part of existing home footprint.
State law currently prohibits owner-occupancy requirements for ADUs permitted between 2020 and 2025.
Development impact fees are waived for ADUs smaller than 750 sq. ft. For larger units, fees must be proportional.
* While these state laws provide a baseline, always verify specific local overlay zones or fire safety regulations with the San Diego planning department.
Building ADUs in San Diego
Prefabricated and modular ADUs are transforming the construction landscape in San Diego. By building the unit in a factory, these companies can mitigate weather delays and material shortages.
We list 45 builders providers serving California who offer everything from modern shipping container homes to traditional-looking panelized cottages. Perfect for the San Diego market where speed to market is essential.
Frequently Asked Questions about ADUs in San Diego
Common questions from local homeowners
ADU construction costs in San Diego typically range from $250-$400 per square foot for standard construction. For a 500 sq ft unit, this translates to $125,000-$200,000. Garage conversions are usually more affordable, often costing 30-50% less than new detached construction.
ROI Intelligence
Investment insights for San Diego
Market Rent
$3K/mo
Est. Annual Income
$34K
Est. ROI
15.3%
Monthly Cash
$3K
Value Growth (12m)
-3.6%
*Estimates based on average ADU size (800 sqft) and construction costs ($200K). Actual results may vary. Use calculator for personalized analysis.