Archives

An 800 sq ft detached ADU in Campbell priced phase by phase — about $318,000. The series-high $5.40/sq ft school fee (two districts, one parcel), valuation-based permits, and West Valley Sanitation's per-fixture-unit sewer math.

Two clocks govern California ADU permits: 15 business days for completeness, 60 days for a decision. The fine print on cure lists, tolling, and the JADU gap.

California's solar property-tax exclusion ends January 1, 2027. What counts, what survives a sale, and the 2026 completion trap for ADU solar.

From January 1, 2027, impact fees on the first two ADUs on a lot apply only to the area above 750 sq ft. The 800 sq ft savings, city by city, and why flat fees are still unknown.

Capacity charges, connection fees, panel upgrades — the $0 to $10,000 range nobody puts in the quote. Why sewer is the most volatile ADU line.

School fees turn on one sentence: units under 500 sq ft of interior livable space are exempt. At the 2026 cap of $5.38/sq ft, the 500th foot triggers $2,690.

A contractor's 'all-in' quote rarely includes government, tax, or reserve lines. Ten lines after signing, with ranges from verified California fee ledgers.

On 23 October 2026, a California appeals court revived a homeowner's damages claim over a three-year ADU permit delay. The ruling, the 60-day ministerial rule behind it, and the paper trail applicants should keep — plus what the court did not decide.

An 800 sq ft detached ADU in Pasadena priced phase by phase — about $310,000. The series-low $2.24/sq ft school fee, a proportional impact fee tied to your main house, and a city-run pre-approved plan program with published permit estimates.

Building an ADU triggers a property tax reassessment — but only on the new construction, not your whole house. How Prop 13's new-construction rule works, what the assessor actually adds, and why your original tax basis stays protected.

SB 1117 kills the 750 sq ft impact-fee cliff, SB 1196 forces utility connection deadlines, and AB 956 allows two detached ADUs per lot. All signed Sep 29, 2026 — all effective Jan 1, 2027. What each one changes for your project.

AB 956 doubles detached ADUs, SB 1117 collapses impact fees to a 50 sq ft basis, and SB 1196 targets utility energization delays. What each law actually does.

An 800 sq ft detached ADU in San Bernardino priced phase by phase — $316,000*. The city with the clearest 750 sq ft cliff in California code: §19.04.030 spells out the pro-rata impact-fee formula in plain ordinance language. School fees confirmed at $4,304; the building permit schedule and water/sewer dollar figures are not published.

Three ways to add a housing unit in California, compared side by side: detached ADU ($320,000), garage conversion ($190,000), and JADU (no published total — but nearly every fee is $0). Cost, timeline, rental income, and constraints in one decision table.

Contractor bids never include contingency — but 10–15% ($32,000–$48,000 on a $320,000 ADU) is the industry standard reserve held by the owner. What it covers, what it doesn't, and how to size it.

An 800 sq ft ADU at $400 per foot looks cheaper than a 400 sq ft ADU at $538 — until you see which costs don't scale. How per-square-foot math works, where it breaks, and the fee lines actually priced per foot.

Impact fees are the most misunderstood ADU line: $0 at 750 sq ft or less, prorated above it, and narrowed to the area above 750 for a homeowner's first two ADUs in 2027. What counts, what doesn't, and what real cities charge.

An 800 sq ft detached ADU in Chula Vista priced phase by phase — $308,000. The series standout for permit pricing transparency: a flat $3,951 ADU permit (no valuation math), 12 pre-approved SnapADU plans, and a DIF that scales proportionally to the primary residence. The school-fee split is half confirmed.

Seven California cities offer pre-approved ADU plans — from Chula Vista's 12 SnapADU designs to Pasadena's free city-drawn prototypes. What 'free' actually saves you ($1,000–$3,000 in plan check) and what it doesn't.

An 800 sq ft detached ADU in Oceanside priced phase by phase — about $313,000. The zoning ordinance says the city 'shall not impose any impact fees upon the development of an ADU or JADU,' but a 2025 park DIF nexus draft (not adopted) would charge 800 sq ft ADUs up to $6.03/sq ft. Five items are awaiting confirmation from the city.

Same 800 sq ft ADU, $2,528 difference in school fees — from school district boundaries alone. Pasadena Unified charges $2.24/sq ft; Campbell's two districts total $5.40/sq ft. Why the rate varies and who sets it.

Three permit pricing models across California cities — valuation-based (Pasadena, Campbell), flat-fee (Fontana $3,195, Chula Vista $3,951), and per-square-foot (Oceanside ~$7,541). How to read any fee schedule before you apply.

Lakewood spans four school districts: the same 800 sq ft ADU owes $2,376, $3,832, or $4,304 in school fees by parcel. Full phase-by-phase cost breakdown.

California ADU owners wait up to 9–12 months after construction for the utility hookup — a finished apartment with no power. SB 1196, signed Sept 2026 and effective Jan 1, 2027, orders the CPUC to set hard deadlines with penalties, and lets you file the hookup request alongside the building permit.

State law says 60 days. Reality says plan for more. The ADU permit timeline phase by phase — completeness review, plan check rounds, corrections, inspections — with the statutory clocks (60-day approval, 15-day completeness, 30-day pre-approved review) and why '6-month build' quotes hide 3–4 months of paper.

Salinas charges $0 in development and traffic impact fees on ADUs — at any size. The 750 sq ft cliff doesn't apply because there's no cliff to fall off. An 800 sq ft detached ADU priced phase by phase, with the valuation-based $6,226 permit and four pre-approved plan sets drawn just under 750.

Governor Newsom signed AB 956 (Chapter 791) on Sep 29, 2026 — effective Jan 1, 2027, cities must ministerially approve up to two detached new-construction ADUs on a single-family lot, up from one. Each unit: up to 800 sq ft, 4-ft side and rear setbacks, 16-ft height (18 ft near major transit). The JADU tradeoff, the HOA rule change, and the fee math with SB 1117. Verified against the official leginfo chaptered text.

The same 800 sq ft ADU, four Bay Area fee philosophies: Palo Alto ~$303,000 (corrected), Oakland $322,000, San Francisco $325,000, San Jose ~$400,000. Why the 'expensive Bay Area' assumption falls apart once you read the fee schedules — and where the 750 sq ft cliff bites hardest.

Why school district fees on the same 800 sq ft ADU range from $1,792 to $4,304 across California — who sets the rate, what Level 1 vs Level 2 means, why 500 sq ft is the magic number, and the 13-city data from our fee series.

800 sq ft ADU in Santa Rosa: ~$320,000. 25% impact-fee cut; water/sewer $8,230 exceeds DIF.

Fontana charges $20,563 per new single-family home in development impact fees — among the heaviest in our series — but its own free 738 sq ft ADU plan slips under the 750 sq ft cliff and pays $0. An 800 sq ft detached ADU priced phase by phase, with the city's flat $3,195 permit and the state's maximum $5.38 school fee.

800 sq ft ADU in Laguna Beach: ~$314,000. No impact fees, $215/100 sq ft sewer, $2.05 school fee.

800 sq ft detached ADU in Santa Barbara: ~$327,000 total. Permit + plan check ~$22,566 — the series high. No city impact fees. Phase-by-phase breakdown.

SB 1117, signed Sept 29, 2026, rewrites the ADU impact-fee rule: from Jan 1, 2027, cities may charge fees only on square footage above 750 — not the whole unit. City-by-city savings table: Palo Alto ~$8,000–$20,000 → ~$500–$1,250; Anaheim ~$10,411 → a fraction. What changes, what doesn't, and the December-vs-January permit question.

California's most expensive 50 square feet: build an ADU at 749 sq ft and pay $0 in impact fees; build at 800 and owe thousands. How the 750 sq ft cliff works, with real numbers from Glendale, Sacramento, Torrance, Palo Alto, and Fontana — and what SB 1117 changes on Jan 1, 2027.

800 sq ft detached ADU in Encinitas: ~$322,000 total. A 749 sq ft ADU pays $0 DIF; a 750 sq ft ADU pays $20,663. Phase-by-phase breakdown.

800 sq ft detached ADU in Riverside: $309,000 total, $1,006 permit (series low). Phase-by-phase breakdown.

Five prefab ADU brands, one 800 sq ft question. Abodu and Villa Homes publish real numbers ($424,800 and from $261,000–$282,000 all-in); Boxabl, Dvele, and Mighty Buildings don't. What the price you can see actually covers — and what it doesn't.

The same 800 sq ft detached ADU priced in Anaheim, Fullerton, and Garden Grove — $318,000 to $320,000. Anaheim charges the series' highest impact fees, Fullerton charges the series' cheapest permit, and Garden Grove hands out free plans. Same county, three different answers to what an ADU should cost the city.

The same 800 sq ft detached ADU priced in Long Beach, Glendale, Burbank, and Torrance — $313,000 to $320,000. Same county, same state law, wildly different fee structures: flat-rate impact fees, pro-rata cliffs, ADU-specific permit lines, and a sewer cliff that exists in exactly one city.

An 800 sq ft detached ADU in Torrance priced phase by phase — $317,000. The first city in this series with a flat-rate ADU impact fee ($2,243.47, no pro-rata math against the house), top-tier school fees, and no ADU sewer capacity charge. Seven items are awaiting confirmation from the city.

Burbank ADU fees: a $3,692 permit (series high) and a 750 sq ft cliff on the sewer bill.

Anaheim ADU fees: the steepest impact fees in the series, plus the only combined permit-plus-plan-check fee.

Fullerton ADU fees: the cheapest permit in the series ($1,223) and a two-district school fee.

Garden Grove ADU fees: two cliffs (500 sq ft schools, 750 sq ft impact fees) and four free plans.

Santa Maria ADU fees: the boom town with the least transparent fee schedule in the series.

Glendale ADU fees: the 50 sq ft cliff — the largest legal ADU always pays impact fees.

Long Beach ADU fees: ADU-specific reduced rates — neither a cliff nor an exemption.

Sacramento ADU fees: crossing 750 sq ft costs $5,728 in impact fees.

Oakland ADU fees: zero impact fees on ADUs, plus the $4,136 school fee and 4–6% permit rule.

Three ADU bids, three different numbers, none of them comparable — until you sort every line into four buckets: Included, Allowance, Excluded, Owner-paid. The checklist that turns quotes into a decision.

A Junior ADU is California's only housing type with no impact fees, no school fees, no utility connection charges, and no parking requirement. How the six-phase ledger collapses when the unit lives inside a house that already exists.

San Francisco ADU fees: why the 750 sq ft impact-fee cliff barely exists here.

From a $59,854 one-square-foot fee cliff in Maryland to a $60 building permit in Wyoming — the five wildest ADU government-fee findings from our 148-city national dataset. Every figure from an official source.

San Jose ADU fees line by line, plus four other Bay Area jurisdictions.

San Diego ADU fees across four cities — the same build costs $17,400 more by street.

LA County ADU fees: City of LA vs unincorporated paths, soft costs, and the 750 sq ft cliff.

We modeled a typical 2-car garage conversion ADU in Los Angeles County (~450 sq ft living). Total: $190,000. See which phases shrink vs a new detached build — and which grow.

Soft costs on California ADUs typically land around $28,000–$40,000 before construction starts. Here is every design, engineering, plan check, and fee line — with ranges by jurisdiction type.

Take the $320,000 construction model (and ~$381,000 all-in year-one) against realistic LA County ADU rents. Simple payback, cash-on-cash, and what breaks the model — with a hard not-financial-advice disclaimer.

Same 800 sq ft ADU plan priced two ways: LA coastal band near $380,000 ($475/sq ft) vs Inland Empire near $300,000 ($375/sq ft). Six phases, same drawings — labor, fees, coastal review, and access drive the swing.

The $320,000 and $215,000 construction models are not what you actually spend. Add 12% contingency, construction loan interest, Prop 13 ADU-only tax, vacancy, and optional management — here are clear year-one all-in tables.

Same 800 sq ft detached ADU, two delivery methods. Site-built baseline $320,000. Modular lands near $288,000 after crane and transport — here is where each phase saves or grows.

We modeled a 400 sq ft detached ADU in Los Angeles County. Total: $215,000 — or $538 per square foot. Here is every phase, why fixed costs dominate, and when 400 still makes sense.

We modeled an 800 sq ft detached ADU in Los Angeles County and priced every phase. Total: $320,000. Here is where each dollar goes and why smaller is not cheaper.