Plain-English guides to California ADU law.
SB 1211, JADUs, detached ADU rules, 2026 changes, costs, rents, and the housing pathways coming next. Written by the developers who build these projects.
ADU Calculator: Cost, Rent, ROI, and Value for Any California Address
A free ADU calculator that runs on your actual parcel: build cost from local pricing, rent from live comps, value added by the right appraisal…
Read →Cost & finance · 2026-03How Much Does an ADU Cost in California? 2026 Construction Cost by Type and Size
ADU construction cost in California for 2026: garage conversion, prefab, detached, attached, and JADU, with cost per square foot, 500, 800, and 1,200…
Read →Coming to Parcy · 2026-02SB 79: What Transit-Oriented Upzoning Means for Your Lot in 2026
California SB 79, effective July 1, 2026, overrides local density and height limits within a half mile of major transit stops in the largest…
Read →Permits · 2026-02ADU Permit Process in California: Steps, Timeline, and Cost (2026)
How to get an ADU permit in California: zoning check, plans, pre-approved plan sets, plan check, the 60-day approval clock, SB 543 deemed-complete…
Read →Multifamily ADUs · 2026-01SB 1211 Explained: Up to 8 Detached ADUs on a Multifamily Lot
California SB 1211 lets multifamily property owners add detached ADUs up to the existing unit count, capped at eight, plus converted-space ADUs. How…
Read →Law update · 2026-01California ADU Laws 2026: Every New Rule, Explained Plainly
The 2026 California ADU law changes: SB 543 deemed-complete rules and the 800 sq ft interior measurement, AB 1154 JADU owner-occupancy, AB 462…
Read →Cost & finance · 2025-12ADU Rental Income and Property Value: How Appraisers Count ADUs
How an ADU changes your property value: sales comps for one to three units, the income approach for five or more, the four-unit blend, cap rates, and…
Read →ADU basics · 2025-12JADU Guide: Junior ADU Rules, 500 Square Feet, and the 2026 Owner-Occupancy Change
What a junior accessory dwelling unit (JADU) is, the 500 square foot limit, efficiency kitchen rules, shared bathroom option, and how AB 1154 changed…
Read →ADU basics · 2025-11Detached ADU in California: Size, Setbacks, Height, Cost, and Rent
Everything a California homeowner needs to know about building a detached ADU: the 800 sq ft state exemption, 4-foot setbacks, 16 and 18 foot height…
Read →ADU basics · 2025-10The Two-ADU Rule: One ADU Plus One JADU on a Single-Family Lot
California state law lets a single-family lot add one detached ADU up to 800 square feet and one JADU up to 500 square feet, by right. How the…
Read →Law update · 2025-09AB 1033: Can You Sell an ADU Separately in California?
AB 1033 lets California cities allow ADUs to be sold separately from the main home as condominiums. Which cities opted in, how the condo map and HOA…
Read →Law update · 2025-08AB 2533: How to Legalize an Unpermitted ADU in California
AB 2533 expanded the amnesty path for unpermitted ADUs and JADUs built before January 1, 2020. What cities can and cannot require, the health and…
Read →Coming to Parcy · 2025-07SB 9 Explained: Urban Lot Splits and Duplexes on Single-Family Lots
California SB 9 lets owners of single-family lots split the lot and build up to two homes on each half, ministerially. The 40/60 rule,…
Read →Coming to Parcy · 2025-07SB 684 and SB 1123: Up to Ten Homes on a Small Lot, Ministerially
SB 684 allows ministerial small-lot subdivisions of up to 10 homes on multifamily-zoned parcels under five acres. SB 1123 extends it to vacant…
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