Chapter 07 · The Journal
Everything you need to know, before you build.
Honest, practical answers about ADU cost, financing, permits, and how to choose a builder in California, written by the family that builds them.
Featured · Buying Guide
Building an ADU for Rental Income in California (2026)
Building an ADU for rental income in California? See which models rent best, our all-in pricing with the permitting budget included, and how to run the ROI numbers before you build.
Aug 05, 2026 · 9 min read →
Latest GuideAug 05, 2026
All Guides · 113 Entries
Buying Guide An ADU for Your Adult Children: A California Guide An ADU for adult children keeps your kids close and housed for $180,000 to $557,000, permitting budget included. See which models fit, real costs, and how to pay for it. 8 min → Financing How to Finance an ADU Without Cash on Hand (4 Real Paths) Four practical ways to finance a California ADU when you don't have $200K+ in liquid cash, HELOC, construction-to-permanent loan, cash-out refi, and specialized ADU lenders. Pros, cons, and the math. 8 min → Process How Is an ADU Built? (Factory-Built vs Site-Built, Step-by-Step) Inside how a Framework First ADU is built, 97% in a climate-controlled Salinas factory, crane-delivered in one day. Materials, quality control, and what makes factory-built homes stronger than site-built. 9 min → Buying Guide ADU vs Home Addition: Which Adds More Space, Value, and Income? Side-by-side comparison of ADUs vs home additions in California, costs, build times, rental potential, property value impact, and a decision framework for which is right for your goal. 8 min → Permits Building an ADU in the Monterey County Coastal Zone What changes when your Monterey County property sits in the Coastal Zone: the Coastal Administrative Permit requirement, septic considerations, and how it layers on top of (not instead of) your state ADU rights. 4 min → Permits Monterey County ADU Fees: What You Actually Pay (2026) A breakdown of Monterey County ADU fees for 2026: which units qualify for the state impact fee waiver, when connection and permit fees apply, and how Framework First builds a permitting budget into every price. 5 min → Permits Monterey County ADU Permit Timeline: How Long It Actually Takes The real Monterey County ADU permit timeline for 2026: the state's 60-day decision clock, how pre-designed plans can speed review, and how factory building overlaps permitting to shorten total delivery. 4 min → Permits ADU Rules for Unincorporated Monterey County How ADU rules work if your property is in unincorporated Monterey County rather than inside a city like Salinas or Marina, including the county's own 4-foot setback standard and free pre-designed plans. 5 min → Permits San Benito County ADU Fees: What State Law Guarantees You San Benito County follows California's state ADU law closely with few local overlays. Here's the fee protection that applies, and how we confirm the rest for your specific parcel. 4 min → Permits Santa Clara County ADU Rules: Why It Depends on Your City Santa Clara County doesn't set one countywide ADU rulebook. Here's why the real rules live at the city level, with verified specifics for San Jose, Morgan Hill, and Gilroy. 5 min → Permits Building an ADU in the Santa Cruz County Coastal Zone What changes when your unincorporated Santa Cruz County property sits in the Coastal Zone, and why your state ADU rights still apply underneath the coastal review layer. 4 min → Permits Santa Cruz County ADU Fees: The Waivers That Actually Apply Santa Cruz County ADU fees for 2026: which fees are waived for conversions, JADUs, and small units, and how Framework First's all-inclusive pricing already budgets for the rest, confirmed per parcel in your feasibility study. 4 min → Permits Santa Cruz County ADU Permit Timeline: The 60-Day ePlan Process How long an ADU permit actually takes in unincorporated Santa Cruz County: the 60-day state clock, the county's ePlan system, and what really slows submittals down. 4 min → Permits ADU Rules for Unincorporated Santa Cruz County How ADU rules work outside the cities of Santa Cruz and Watsonville: lot-tiered sizing, Urban Services Line height limits, and what makes unincorporated county lots different. 5 min → Buying Guide Best ADU for a Home Office: Which Model Wins A backyard office ADU should be efficient, quiet, and affordable, not a full second home. See which compact model fits best as a home office. 8 min → Buying Guide Best ADU for Adult Children: Which Model Wins An ADU for a grown child needs independence: their own kitchen, their own door, and room to actually live. See the top Framework First picks. 8 min → Buying Guide Best ADU for Aging in Place: Which Model Wins Aging in place means single-level living with no stairs and everything within easy reach. See which Framework First model fits best. 7 min → Buying Guide Best ADU for Aging Parents: Which Model Wins Which Framework First model fits an aging parent best: single-story living, easy layout, privacy for two households. Top picks, priced and specced. 8 min → Buying Guide Best ADU for First-Time Investors: Which Model Wins First-time ADU investors want the strongest return for the least risk. See which Framework First model gives the best rent-to-cost ratio to start with. 7 min → Buying Guide Best Guest House ADU: Which Model Wins A guest house ADU should feel generous without being oversized. See which Framework First model is the best fit for hosting family and friends. 8 min → Buying Guide Best ADU for Multigenerational Living: Which Model Wins Multigenerational households need more than one bedroom and real separation. See which Framework First models fit two households best, priced and specced. 7 min → Buying Guide Best ADU for a Small Lot: Which Model Wins Not every backyard has room for a big footprint. See which Framework First models fit the tightest lots, ranked by actual footprint dimensions. 7 min → Buying Guide Best ADU for Rental Income: Which Model Wins The Six Sixty 2BR is our top pick for rental income: two bedrooms in a 660 sq ft footprint. See how it compares to our other strong rental layouts, priced and specced. 8 min → Buying Guide Best Two-Bedroom ADU: Which Model Wins Framework First builds six different two-bedroom ADU configurations. See how they compare on size, price, and layout to find the right fit. 7 min → Financing ADU Construction Loan Guide A construction-to-permanent loan funds an ADU build in stages, then converts into a regular mortgage once the home is done. Here's how it actually works. 8 min → Financing ADU Financing Options for Retirees Retirees on a fixed income face different financing questions than working homeowners. Here are the main paths retirees use to fund an ADU, and where to get real guidance. 7 min → Financing California ADU Grant Programs: What Is Actually Available California has offered ADU grant funding before, but availability changes. Here's the honest, current picture before you plan your budget. 7 min → Financing How ADU Loan Rates Work in 2026 ADU loan rates are not one number. What you pay depends on the loan type, your credit and equity position, and the broader rate environment. 6 min → Financing Cash-Out Refinance for an ADU: How It Works A cash-out refinance swaps your mortgage for a larger one and gives you the difference in cash to fund an ADU. Here's how it works and who it fits. 9 min → Financing Using an FHA 203(k) Loan for an ADU FHA expanded its 203(k) rehabilitation loan program to support accessory dwelling units. Here is what changed and how the program can apply to an ADU project. 8 min → Financing Financing an ADU on an Empty Lot Financing an ADU on a vacant lot works differently than financing one in your backyard, because there's no existing home to borrow equity against. 7 min → Financing Home Equity Loan vs HELOC for an ADU A home equity loan and a HELOC both borrow against your home's equity, but they work very differently. Here's how to tell which fits your ADU project. 8 min → Financing Paying Cash vs Financing an ADU Some homeowners can pay cash for an ADU outright. Here's how that trade-off against financing really breaks down, beyond just avoiding interest. 9 min → Financing Refinancing After Your ADU Is Built Once an ADU is finished and appraised, some homeowners refinance to consolidate their construction loan, lower a rate, or pull out added equity. 8 min → Financing Renovation Loans for an ADU Renovation loans let you borrow against what your property will be worth after the ADU is built, not just its value today. 7 min → Financing Using Future Rental Income to Qualify for an ADU Loan Some lenders count an ADU's expected rent toward the income used to qualify for its own construction loan. Here is how that generally works. 7 min → Permits ADU Ceiling Height Requirements California's building code generally requires at least 7 ft of ceiling height in habitable ADU space, with bedrooms sometimes needing 7 ft 6 in. Here's how it works. 6 min → Process ADU Electrical Panel Upgrade Requirements Does building an ADU mean upgrading your home's electrical panel? Here's how the decision gets made, who makes it, and what to expect during planning. 5 min → Permits ADU Impact Fees Explained How California's ADU impact fee rules actually work: waived entirely under 750 square feet, proportional to your primary home at 750 sq ft and up, and why that's a separate question from your local building permit fees. 5 min → Buying Guide ADU Insurance: What Changes When You Build One Building an ADU adds insurable value to your property, which means your homeowner's policy usually needs an update, and a rented ADU may need landlord coverage. Here's what to expect. 6 min → Permits What Are ADU Lot Coverage Rules in California? Lot coverage limits the percentage of a lot that structures can cover. In California, if a city's lot coverage rule would block an 800 sq ft ADU, it must yield. 7 min → Buying Guide ADU Rental Agreement Basics in California Yes, an ADU rental needs a written lease, and California's standard landlord-tenant laws apply. Here's what to cover and why improvising a lease is a bad idea. 6 min → Permits ADU Septic System Requirements: What You Need to Know If your property runs on septic instead of sewer, your ADU's wastewater load usually needs to be evaluated first. Here's what that means and how to check. 6 min → Permits ADU Title 24 Energy Requirements California's Title 24 sets efficiency standards for insulation, windows, and HVAC on new ADUs, and is related to (but separate from) the solar mandate. Here is what it means for your build. 6 min → Pricing ADU vs Moving: Which Is Cheaper? A plain-language cost comparison of building an ADU versus selling and moving, covering realtor commissions, closing costs, mortgage rates, and the disruption of leaving your neighborhood. 6 min → Buying Guide Are Prefab ADUs Good Quality? Prefab ADU quality depends on the builder, not the method. Here's what actually determines whether a factory-built ADU holds up, and what to check before you buy. 5 min → Permits Can an ADU Be Bigger Than the Main House? In most California cities, no. ADUs are generally required to stay subordinate in size to the primary residence, on top of the state's flat 1,200 sq ft cap. Here's how that rule works. 6 min → Buying Guide Can an ADU Be Built Over a Garage? Yes, in many California cities you can build an ADU above an existing or new garage. Here's how it works, what it usually requires, and how it differs from a single-story factory-built ADU. 6 min → Buying Guide Can an ADU Have a Garage? Yes, an ADU can include a garage, but California's ADU parking exemptions mean most homeowners don't need one. Here's how the tradeoff actually works. 5 min → Permits Can an ADU Be Two Stories? Yes, California ADU law leaves enough height for two stories in many cases. Here's what the state guarantees, what local zoning still controls, and why Framework First builds single story. 6 min → Permits Can I Airbnb My ADU in California? Short-term rental rules for ADUs vary by city and county in California. Here's how to find out what applies to your property before you plan an Airbnb strategy. 6 min → Permits Can I Build an ADU in a Coastal Zone? Yes, you can generally build an ADU in California's Coastal Zone, but expect an added coastal development review on top of the standard ADU permit. Here's how it works. 6 min → Permits Can I Build an ADU on a Flag Lot? Yes, ADUs are often possible on flag lots. Here's how the narrow access driveway affects factory-built delivery and what a feasibility study checks first. 6 min → Permits Can I Build an ADU on a Sloped Lot? Yes, a sloped lot usually still works for an ADU in California. Here's what changes: foundation engineering, possible retaining walls, and why a feasibility study is what confirms the real cost and plan. 6 min → Permits Can I Build Two ADUs on My Lot? On a single-family lot, California law generally allows one ADU plus one JADU, not two full ADUs. Here's how the state's unit-count rules actually work, and what changes on a multifamily lot. 6 min → Buying Guide Can I Convert My Shed Into an ADU? Yes, in many cases an existing shed or accessory structure can become an ADU under California's conversion rules, but code-compliant conversion is usually a near-total rebuild, not a simple upgrade. 6 min → Permits Can I Live in My ADU and Rent Out My Main House? Yes, in most cases. California does not require owner-occupancy for a standard ADU, so you're free to live in the backyard unit and rent out the primary home. Here's the one exception. 6 min → Permits Can I Sell My ADU as a Condo? Yes, in some California cities. Here's the practical, step-by-step answer to whether you can sell your ADU separately as a condo, and how to find out if your city allows it. 5 min → Permits Can My HOA Block an ADU? California Civil Code 4751 stops HOAs from unreasonably restricting an ADU on single-family lots, though condos and shared-ownership properties are a more complex, evolving area. 6 min → Financing Can You Finance a Prefab ADU With a Mortgage? Yes, prefab ADUs are financed the same way site-built ones are, through a HELOC, cash-out refinance, construction loan, or renovation loan. Here's how it works. 6 min → Buying Guide Do ADUs Need a Kitchen? Yes, a standard ADU needs a full kitchen to legally function as an independent dwelling unit. Here's how that differs from a JADU's smaller efficiency kitchen. 5 min → Permits Do ADUs Need Fire Sprinklers in California? Most ADUs in California do not need fire sprinklers. Here is the exact rule: an ADU only needs them if the primary home on the same lot is also required to have them. 5 min → Permits Do ADUs Pay School Fees in California? Whether your California ADU owes school impact fees comes down to one number: 750 square feet. Here's how the size threshold and proportional-fee rule actually work. 6 min → Permits Do ADUs Require Solar Panels in California? Most newly built detached ADUs in California must include solar panels under Title 24, but attached ADUs, conversions, and some small units are exempt. Here's how to know which applies to you. 5 min → Process Do I Need an Architect for an ADU? No, you generally don't need to separately hire an architect for an ADU. Plans just need to be prepared and stamped for permitting, and a factory builder like Framework First already includes that in-house. 6 min → Pricing Do Prefab ADUs Hold Their Value? Yes, a well-built, permitted prefab ADU holds and adds real property value. The key is understanding the difference between factory-built modular construction and a mobile or manufactured home. 7 min → Pricing Does an ADU Increase Property Taxes? Yes, but only partially. Learn how California reassesses just the new construction value of your ADU, not your whole property, under Prop 13 rules. 4 min → Process Does an ADU Need a Separate Utility Meter? A separate utility meter is not required for most ADUs. Learn when a shared meter works, when a separate one makes sense, and how to decide for your project. 4 min → Process Does an ADU Need Its Own Address? Many California cities assign a separate address to a detached ADU for mail, utilities, and emergency response, but the exact rule is set locally, not by state ADU law. Here's how it works. 6 min → Permits How Close Can an ADU Be to the Main House? California ADU law sets no required distance between an ADU and the primary home, only setbacks from property lines. Fire and building code decide the rest. 6 min → Pricing How Do ADU Appraisals Work? A quick breakdown of how an appraiser values a completed ADU, from size and rentability to how comparable sales in your area treat accessory units. 4 min → Process How Do ADU Utility Hookups Work? How water, sewer or septic, electrical, and gas hookups work for a new ADU, and how Framework First decides between connecting to your home's existing service or running a new dedicated line. 6 min → Process How Does ADU Crane Delivery Work? How Framework First delivers a finished ADU: truck transport from the Salinas factory, a same-day crane set onto your pre-poured foundation, and the site access a crane and trailer need. 6 min → Buying Guide How Long Do Prefab ADUs Last? A well-built prefab ADU is built to last as long as any other permanent, code-compliant home. Here's what actually determines an ADU's lifespan. 5 min → Pricing How Much Value Does an ADU Add to a Home? An honest answer on ADU value: it depends on your local market, the ADU's size and quality, and how appraisers treat rentable square footage, not one universal percentage or dollar figure. 6 min → Buying Guide How to Be a First-Time ADU Landlord A practical, plain-English starting point for renting out your ADU: screening tenants, setting fair rent, using a real lease, and handling basic landlord responsibilities. 7 min → Financing What Credit Score Do I Need for an ADU Loan? There's no single credit score number that qualifies you for an ADU loan. It depends on the lender and the loan type. Here's how to get a real answer. 6 min → Process What Foundation Does a Prefab ADU Use? A prefab ADU from Framework First sits on a real, permanent foundation poured on-site, either a concrete slab or a raised foundation, while the home is built in parallel in the factory. 6 min → Buying Guide What Is a Detached ADU? A detached ADU is a freestanding, separate home built on the same lot as your house. Here's exactly what makes it different from an attached ADU or a JADU. 5 min → Permits What Happens If I Build an ADU Without a Permit? Building an ADU without a permit can block a future sale or refinance, trigger forced removal or costly retroactive permitting, complicate insurance, and leave uninspected work in place. Here is why the fast, ministerial permit path is worth using. 7 min → Buying Guide What Is a Prefab ADU? A prefab ADU is built largely off-site in a factory, then transported and installed on a permanent foundation. Here's exactly what that means, and how it differs from a manufactured home. 5 min → Buying Guide What Is an Attached ADU? An attached ADU shares a wall or is directly connected to the main house, unlike a detached ADU or a JADU. Here's how it works, its height allowance, and the trade-offs. 6 min → Permits What Is AB 1033, California's ADU Condo Law? AB 1033 is a 2023 California law that lets cities allow ADUs to be sold separately from the main home as condominiums. Here's what it actually does. 6 min → Buying Guide What Is an Efficiency Kitchen (JADU)? An efficiency kitchen is the smaller cooking setup California law allows inside a Junior ADU, a cooktop, small fridge, and prep counter rather than a full range. Here's how it differs from a standard ADU kitchen. 6 min → Permits What Is Ministerial Approval for an ADU? Ministerial approval means your city must approve a compliant ADU application by checklist, not a public vote, within California's 60-day clock. Here's how it works. 5 min → Buying Guide What Size ADU Fits a 5,000 Sq Ft Lot? On a typical 5,000 sq ft lot, most Framework First ADU models fit once you account for the house footprint and setbacks. See the math and which sizes work. 8 min → Buying Guide Prefab vs. Site-Built ADU: Which Is Right for You? An honest comparison of prefab/modular ADUs versus site-built construction, cost, timeline, quality, and disruption, so you can choose the right path for your property. 4 min → Financing How to Finance an ADU in California (HELOC, Construction Loans & More) The practical guide to paying for an ADU in California, HELOC vs. construction-to-permanent vs. cash-out refinance, and how most homeowners actually fund their build. 3 min → Process How Long Does It Take to Build an ADU? (California Timeline) A realistic ADU build timeline for California, from first call to move-in. Why factory-built homes finish in 4 to 9 months while site-built takes 16 to 24, broken down week by week. 3 min → Permits Can You Sell an ADU Separately in California? (AB-1033, 2026) Thanks to AB-1033, California cities can now let you sell an ADU separately from the main house as a condo. Here is how it works, the conditions, and how to know if your city allows it. 6 min → Permits ADU Owner-Occupancy Rules in California (2026) Owner-occupancy is NOT required to build or rent out an ADU in California. Here's exactly what the 2026 rules say, how JADUs differ, and what it means for you. 6 min → Permits ADU Parking Requirements in California (2026) ADU parking requirements in California explained: when one space applies, every transit and garage-replacement exemption, and how most lots owe zero parking. 7 min → Permits ADU Setback Requirements in California (2026) California ADU setback requirements in 2026: 4 ft max side and rear, zero for conversions, front matches your home. See how setbacks shape your build. 8 min → Permits California ADU Laws and Regulations: The 2026 Guide A plain-English guide to California ADU laws in 2026: size, setbacks, 60-day approval, parking, owner-occupancy, JADUs, impact fees, and how many you can build. 9 min → Permits Do You Need a Permit to Build an ADU in California? Yes, you need a permit for an ADU in California, but approval is ministerial with a 60-day decision. Here is exactly what the permit set includes and who handles it. 8 min → Permits How Big Can an ADU Be in California? (2026 Size Limits) How big can an ADU be in California? Up to 1,200 sq ft detached, with cities required to allow at least 800 sq ft. Full 2026 size rules, explained simply. 7 min → Permits Monterey County ADU Regulations (2026) Monterey County ADU regulations explained for 2026: state law baseline, setbacks, parking, size limits, and what varies by city, so you can build with confidence. 8 min → Permits San Benito County ADU Regulations (2026) San Benito County ADU regulations for 2026: state law lets you build up to 1,200 sq ft in Hollister and San Juan Bautista, with bigger lots making it easier. 8 min → Permits Santa Clara County ADU Regulations (2026) Santa Clara County ADU regulations explained: state law baselines plus local rules for San Jose, Los Gatos, Sunnyvale and Cupertino, so you can build with confidence. 10 min → Permits Santa Cruz County ADU Regulations (2026) Santa Cruz County ADU regulations explained: state law baselines, local rules for Santa Cruz, Watsonville, Aptos and Capitola, plus coastal and slope notes. 8 min → Pricing ADU Appraisal and Resale Value in California: What Your ADU Adds to Your Home How appraisers value ADUs in California, typical premium of 95 to 125% of build cost, what affects the appraisal, and how rental income, design quality, and AB-1033 condo-ization influence resale value. 7 min → Buying Guide Building an ADU for Aging Parents in California (A Practical Guide) How to plan, design, and finance an ADU for aging parents in California, accessibility features, layout choices, financing options, and the conversations to have before you build. 9 min → Buying Guide California ADU Rental Laws (2026): What You Can and Can't Do California ADU rental laws explained in plain English, minimum lease lengths, short-term rental rules, owner-occupancy, tenant protections, AB-1033 condo-ize-and-sell, and the city-level details to verify. 10 min → Process Garage Conversion to ADU in California: Costs, Permits, and Whether It's Worth It Converting a garage to an ADU in California, typical costs ($80K to $160K), permit pathway, what you keep vs lose, and how it compares to a new factory-built ADU. 8 min → Permits SB 9 Lot Splits in California: How They Work + How They Pair With ADUs California Senate Bill 9 (2022) lets owners of single-family lots split into two parcels and build up to two units on each. How the process works, which lots qualify, and how it pairs with ADUs. 7 min → Permits ADU Permit Timeline in California: What to Expect in 2026 How long ADU permits take in California, the state rules that protect your timeline, and how factory building runs the permit process in parallel to save months. 4 min → Buying Guide ADUs and Property Taxes in California: What to Expect How building an ADU affects your California property taxes, why your whole home isn't reassessed, how the 'blended' assessment works, and what it means for your bill. 3 min → Buying Guide Best ADU Builders in California (2026): An Honest Comparison A fair, no-spin comparison of California ADU builders in 2026, Framework First, Abodu, Samara, Villa Homes, and local contractors, on price, timeline, transparency, and who each is best for. 4 min → Process Can I Build an ADU on My Property? (California Eligibility) A plain-English checklist for whether you can build an ADU in California, lot size, setbacks, parking, and the state laws that make most single-family lots eligible by right. 3 min → Pricing How Much Does an ADU Cost in California? (2026 Prices) A straight answer on ADU costs in California in 2026, real all-inclusive prices by size, what's included, and how prefab compares to site-built. From a family builder in Salinas. 4 min → Pricing How Much Rent Can an ADU Earn in California? (2026) Realistic ADU rental income for California in 2026, by size, by use, and what's left after the mortgage. Plus the equity an ADU adds and how to run your own numbers. 3 min → Buying Guide JADU vs. ADU: What's the Difference? (California) A clear comparison of a Junior ADU (JADU) and a standard ADU in California, size limits, kitchens, owner-occupancy, cost, and which one is right for your goal. 3 min →