ADU guides, page 6
68 guides on what an ADU costs, what the law allows and how to hire well. Every number links to the state law, city page or study it came from.

Money
ADU insurance: homeowners, landlord and builder's risk coverage
How a homeowners policy treats a detached or attached ADU, when a rented unit needs landlord coverage, builder's risk, earthquake and FAIR Plan.
Updated Oct 26, 2026
Liens
Mechanics liens in California: a guide for ADU owners
Preliminary notices, lien deadlines, the four lien release forms and how to keep a lien off your title.
Updated Oct 26, 2026
Contracts
ADU contract checklist for California homeowners
What a home improvement contract must say, the deposit cap, payment schedules, change orders and a signing checklist.
Updated Oct 26, 2026
Building
ADU inspections: the checklist from foundation to final
Every city inspection in order, how to book them in San Diego, what to have ready, failed inspections and the final.
Updated Oct 26, 2026
Family
ADU for seniors: aging-in-place design, grants and taxes
Design dimensions for aging in place, the programs that actually help older owners, reverse mortgages, Prop 19 and property tax for 55+ and 62+.
Updated Oct 26, 2026
Hiring
ADU builder red flags, and what to do when a company fails
Warning signs before you sign and during the build, the $1,000 deposit cap, common ADU scams and steps if your builder shuts down.
Updated Oct 26, 2026
Renting
ADU short-term rental rules in San Diego and California
Whether you can Airbnb an ADU: state law, San Diego's 31-day rule, license tiers, TOT, penalties and the 31-day alternative.
Updated Oct 26, 2026
Renting
Renting out an ADU in California: tenant laws, AB 1482 and leases
AB 1482's exemptions for ADUs, San Diego's Tenant Protection Ordinance, deposit limits, habitability, the lease and ending a tenancy.
Updated Oct 26, 2026