Be Neighbor Pattern

Be my Neighbor Appendix A

Financing ADUs and Legislation Across the Country

Evaluating long term benefits and potential financing options is key to successful ADU construction. Likewise, evaluating legislation across the country provides a policy roadmap for municipalities.

Financing

Average Costs of ADU Construction

Size (sq ft) Type Total Cost per sq ft

676

Detached new construction

$180,833

$305

676

Basement ADU

$185,833

$265

556

Attached ADU

$154,400

$300

504

Garage Conversion

$142,000

$297

978

Detached new construction above a garage

$217,717

$212

Source: Backdoor Revolution: The Definitive Guide to ADU Development. Table does not include design and permitting costs

ADU Cost: $250,000

Resulting monthly costs

30 year mortgage at 4% interest

$1,194

Property taxes at 1% of added value

$208

Additional insurance

$50

Maintenance and upkeep

$50

Total monthly cost

$1,502

ADU Cost: $150,000

Resulting monthly costs

30 year mortgage at 4% interest

$716

Property taxes at 1% of added value

$125

Additional insurance

$50

Maintenance and upkeep

$50

Total monthly cost

$941

Legislation Across the Country