Field notes from California residential construction.
Long-form guides on cost, permitting, design, and finance — written by the team running the projects, not a marketing department.
9 min read
- Permitting7 min
The LA ADU permit timeline, week by week
From signed agreement to building permit in 14–22 weeks: what happens, who is doing it, and the three places projects stall.
Open → - Design6 min
Detached, attached, or conversion: choosing the right ADU type
A decision framework for picking the configuration that fits your lot, budget, and rental strategy — with the trade-offs builders rarely volunteer.
Open → - Finance8 min
Financing an ADU without overpaying for the privilege
HELOC, cash-out refi, renovation loan, or cash: a side-by-side on the four real paths LA homeowners use — and the rate math that decides between them.
Open → - Finance7 min
What an ADU actually rents for in LA in 2025
Long-term, mid-term, and short-term rental yields by neighborhood — and why the headline ROI you see in marketing is usually 30% optimistic.
Open → - Design6 min
Designing an ADU you actually want to live in
Twelve design moves that separate a great 700 sq ft ADU from a generic one — most cost nothing extra, all of them protect your re-sale and rental value.
Open → - Permitting11 min
The 2025 LA ADU permitting rulebook, decoded
What [LADBS](https://www.ladbs.org/) and California's HCD actually require in 2025 — by-right approvals, setbacks, owner-occupancy, and the rules that quietly changed this year.
Open → - Process8 min
How to vet any LA ADU contractor in 8 minutes
A repeatable protocol for verifying license, bond, insurance, and complaint history before you sign anything — using only free public databases.
Open → - Design10 min
Title 24 for ADUs: what actually triggers compliance
California's energy code is the single biggest design constraint after setbacks. Here's what Title 24 Part 6 requires for new ADUs in 2025 — heat pumps, fenestration, envelope, and the CF1R signoff.
Open → - Finance9 min
HELOC, cash-out, renovation loan: the ADU money decision
A practical comparison of the four ways LA homeowners actually pay for an ADU — including the one product (renovation loan) that lets you borrow against the finished value.
Open → - Finance7 min
Will your ADU trigger a property tax reassessment?
Under Prop 13 and BOE Rule 463, only the new construction value is reassessed — not the entire property. A practical walkthrough of how the LA County Assessor calculates the bump.
Open → - Permitting8 min
ADU vs SB9 lot split: which path actually fits your lot
Two state laws now let LA homeowners add density. SB9 splits the lot and creates a separately sellable parcel; ADU law adds a unit. The decision turns on three numbers — and one local opt-out.
Open → - Process9 min
Hillside ADUs in LA: soils, grading, and the geo report
Half of LA's buildable parcels sit on slopes the rest of the country would consider unbuildable. A practical guide to soils reports, the LA Hillside Ordinance, and the engineering decisions that drive cost.
Open → - Process8 min
LADWP, SoCalGas and your ADU: the utility connection map
Power, water, and gas hookups account for $8K–$35K of an ADU budget and 4–14 weeks of schedule. A walkthrough of the actual approval paths in 2026.
Open → - Cost9 min
The anatomy of a Bay Area ADU build, line by line
Where every dollar of a $360,000 detached 800 sq ft Bay Area ADU goes — and why the same unit costs $35K–$60K more than its LA counterpart.
Open → - Cost8 min
LA vs. Bay Area ADU costs: a $42,000 gap, explained
Two identical 800 sq ft detached ADUs — one in Mid-City LA, one in Oakland's Rockridge. We rebuilt the budget side by side. The delta is almost entirely labor.
Open → - Permitting9 min
San Francisco ADU permitting: the 2026 rulebook
SF runs the most distinctive ADU process in California — Pre-App meetings, mandatory neighbor notification, and the HCD-compliant pathway. A working playbook.
Open → - Permitting7 min
Oakland ADU permitting: rules, fees, and timeline
Oakland runs one of the more streamlined ADU programs in the Bay Area. What to expect on plan check, impact fees, and parking.
Open → - Permitting7 min
San Jose ADU permitting: the South Bay playbook
San Jose has one of the faster ADU plan-check timelines in California — and the most aggressive pre-approved plans program in the Bay Area.
Open → - Cost7 min
What Bay Area ADUs actually rent for in 2026
Median rents for new-construction ADUs across San Francisco, Oakland, San Jose, Berkeley, and the Peninsula — and what drives the spread.
Open → - Process8 min
Bay Area ADU permit timeline, jurisdiction by jurisdiction
What a realistic permit calendar looks like across SF, Oakland, San Jose, Berkeley, and the Peninsula — with the parts your contractor controls and the parts they don't.
Open → - Cost7 min
How we estimate ADU costs (the calculator methodology)
Every number in our cost calculator is anchored to real 2025 California ADU project data. A transparent walk-through of the model.
Open → - Permitting8 min
AB 1033 explained: selling your ADU separately from your house
AB 1033 lets California cities opt in to allowing homeowners to sell an ADU as a condominium. Here is what it actually does, which cities have adopted it, and what it changes for builders and buyers.
Open → - Permitting6 min
AB 976: California's permanent ban on ADU owner-occupancy requirements
AB 976 made the temporary ban on ADU owner-occupancy rules permanent starting January 1, 2025. Here is what changed, which exceptions remain, and why this matters for investors.
Open → - Permitting7 min
SB 1211: how California unlocked up to 8 detached ADUs on multifamily lots
SB 1211 (effective 2025) raises the cap on detached ADUs at existing multifamily properties from 2 to 8. Here is exactly how the math works and what it means for small-multifamily owners.
Open → - Permitting7 min
ADU vs JADU in California: the structural, legal, and cost differences
An ADU and a Junior ADU (JADU) sound similar but follow different rules for size, kitchen, owner-occupancy, and cost. A side-by-side breakdown so you pick the right one.
Open → - Permitting8 min
Can you rent your ADU on Airbnb? California short-term rental rules by city
California state law permits ADU short-term rentals, but cities can — and do — restrict them. A city-by-city breakdown for Los Angeles, San Francisco, Oakland, San Jose, and the Bay Area suburbs.
Open → - Cost11 min
ADU cost by LA neighborhood: a real-numbers deep dive
Silver Lake, Venice, Highland Park, Mar Vista — why the same 800 sq ft ADU swings $80,000 across LA neighborhoods.
Open → - Process10 min
Prefab ADU vs site-built: the honest 2026 comparison
Prefab promises speed and a fixed price. Site-built promises flexibility. Here's what each actually delivers in California.
Open → - Design12 min
ADU floor plans that actually work: a designer's guide
From 400 sq ft studios to 1,200 sq ft 2-bed units — the layout decisions that make or break a livable ADU.
Open → - Finance9 min
How much does an ADU add to your home's appraised value?
Appraisers don't always credit an ADU dollar-for-dollar. Here's what actually moves the comp.
Open → - Finance8 min
ADU insurance in California: what your policy must cover
Standard homeowners policies often exclude detached structures. The fix is rarely expensive, but it's never automatic.
Open → - Finance10 min
Mid-term rental ADUs: the $4,200/month strategy short-term restrictions can't touch
Traveling nurses, corporate relocations, insurance-displaced families. The 30–180 day rental market clears short-term-rental rules and beats long-term yield.
Open → - Cost11 min
What a Bay Area ADU actually costs in 2026, line by line
Why a detached 800 sq ft ADU runs $360K–$520K across San Francisco, the Peninsula, and the East Bay — and where the $100K Bay Area premium versus Los Angeles is actually spent.
Open → - Permitting10 min
San Francisco ADU permitting rules: planning, building, and the surprises
Why San Francisco has the longest ADU permit cycle in California — and the eight friction points (planning review, rent control, soft-story, fire) that decide whether your project ships in 16 weeks or 36.
Open → - Permitting9 min
Oakland ADU cost and permitting: hills, flats, and the fire-zone overlay
Detached ADUs in Oakland average $355K–$445K. The variance is set by which side of Highway 13 you live on — and whether the lot triggers the Very High Fire Hazard Severity Zone overlay.
Open → - Permitting9 min
San Jose ADU cost and permits: the fastest Bay Area permit cycle
San Jose issues detached ADU permits in 10–14 weeks — the fastest in the Bay Area — and operates one of California's largest pre-approved master plan libraries. Costs run $325K–$420K for a typical 800 sq ft build.
Open → - Cost10 min
Peninsula ADU cost: Palo Alto, Menlo Park, Los Altos, Cupertino
Detached ADUs on the Peninsula run $445K–$620K. Premium land, premium finishes, and the strictest design review process in the Bay Area set the floor.
Open → - Permitting10 min
East Bay and North Bay ADU guide: Alameda, Contra Costa, Marin, Sonoma
Beyond Oakland, the East Bay and North Bay span 40+ jurisdictions with widely different ADU rules. This is the field guide — Alameda, Berkeley, Walnut Creek, San Rafael, Santa Rosa, and the post-fire rebuild zones.
Open → - Cost11 min
Los Angeles garage conversion cost in 2026: the honest 400 sq ft number
What a 400 sq ft LA garage-to-ADU conversion really costs in 2026 — every line item, the upgrades that drive overruns, and how the number compares to a new detached build in [your neighborhood](/adu).
Open → - Permitting9 min
Long Beach ADU cost and permits in 2026: the field guide
Long Beach permit timelines, fees, utility-connection reality, and the 2026 cost ranges for garage conversions, detached studios and 2-bedroom ADUs across [Long Beach neighborhoods](/adu/long-beach).
Open → - Permitting9 min
Pasadena ADU cost and permits in 2026: historic overlays and the real timeline
Pasadena's design review, historic landmark districts, and Public Works coordination make ADU timelines longer than neighboring LA — but the [Pasadena ROI](/adu/pasadena) is among the best in the region. The 2026 cost and permit guide.
Open → - Permitting9 min
Santa Monica coastal ADU guide 2026: Coastal Commission, R1 design, and the cost premium
Santa Monica's R1 design standards, Coastal Commission jurisdiction west of Lincoln, and high construction wages drive the cost premium — but [Santa Monica](/adu/santa-monica) ADUs command the strongest rents in LA County. The 2026 guide.
Open → - Cost8 min
Oakland garage conversion cost in 2026: what $185K actually buys
Oakland garage-to-ADU conversion costs in 2026, the EBMUD connection reality, soft-story retrofit traps, and how Oakland compares to [Berkeley](/adu/berkeley) and [San Francisco](/adu/san-francisco) line by line.
Open → - Cost9 min
San Jose detached ADU cost in 2026: the 800 sq ft number across the South Bay
What an 800 sq ft detached ADU actually costs in 2026 across [San Jose](/adu/san-jose), Santa Clara, Sunnyvale, Cupertino and Mountain View — with permit ranges, utility fees and the Silicon Valley tenant pool that drives ROI.
Open → - Permitting8 min
Berkeley ADU cost and permits in 2026: density-friendly city, strict energy code
Berkeley's housing-element-driven ADU push, the all-electric / rooftop-solar reality, and 2026 cost ranges across the flats, north Berkeley and the hills — paired with the [Berkeley city detail](/adu/berkeley).
Open → - Finance11 min
ADU construction financing in 2026: HELOC, renovation loan, and the new construction-to-perm landscape
How LA and Bay Area homeowners are actually funding ADU builds in 2026 — HELOCs at 8.25–9.5%, renovation loans, construction-to-permanent products, and the new Freddie Mac CHOICERenovation guidance that opened up ADU financing.
Open → - Permitting8 min
Burbank ADU cost and permits in 2026: studio-adjacent ROI, BWP utilities
Burbank's entertainment-industry tenant pool, Burbank Water & Power's friendly connection workflow, and the 2026 cost ranges across the Rancho, Magnolia Park and the hillside. Paired with the [Burbank city page](/adu/burbank).
Open → - Permitting8 min
Glendale ADU cost and permits in 2026: GWP utilities, hillside reality
Glendale Water & Power's friendly workflow, the hillside fire reality north of the 134, and 2026 cost ranges across the Rossmoyne, Adams Hill and Verdugo Woodlands. With anchor to the [Glendale city page](/adu/glendale).
Open → - Permitting8 min
Culver City ADU cost and permits in 2026: tech tenants, design overlay reality
Culver City's tech-tenant pool (Apple, Amazon Studios, HBO Max), the design review overlay, and 2026 cost ranges across the Carlson Park, Sunkist Park and Veterans Park submarkets. Anchored to the [Culver City page](/adu/culver-city).
Open → - Permitting9 min
Torrance and South Bay ADU guide 2026: Torrance, Redondo, Hermosa, Manhattan Beach
The South Bay LA ADU field guide — Torrance, Redondo Beach, Hermosa Beach, [Manhattan Beach](/adu/manhattan-beach) and El Segundo. Coastal Commission overhead, beach-city rents, and 2026 cost matrix.
Open → - Cost8 min
Inglewood and South LA ADU guide 2026: SoFi-adjacent ROI, entry-level pricing
Inglewood, Hawthorne, Lawndale and South LA — the lowest entry pricing in LA County paired with SoFi Stadium / Intuit Dome demand. 2026 cost matrix and the [Inglewood city detail](/adu/inglewood).
Open → - Cost10 min
San Francisco detached ADU cost in 2026: the honest 600 sq ft number
What a 600 sq ft detached ADU actually costs in San Francisco in 2026, where SF Water vs PG&E vs SFPUC fees land, and how the [SF permit reality](/guides/san-francisco-adu-permitting-rules) shapes the timeline.
Open → - Permitting9 min
Irvine and Orange County ADU guide 2026: HOA reality, master-plan permitting
Why [Irvine](/adu/irvine) ADUs run a different playbook than LA County — HOA architectural review, master-plan setback rules, and the 2026 cost ranges across Irvine, Newport Beach, Costa Mesa and Anaheim Hills.
Open → - Process9 min
ADU soft-story and foundation reality 2026: when the existing structure costs more than the new build
Soft-story retrofit triggers in [Oakland](/guides/oakland-garage-conversion-cost-2026), [San Francisco](/guides/san-francisco-detached-adu-cost-2026) and [Berkeley](/guides/berkeley-adu-cost-and-permits-2026), the LA foundation grading reality, and how to budget the existing-structure scope before you sign.
Open →