Once you know an ADU is feasible, the next question is almost always about money: what will it cost, and how do people pay for it? This stage exists to replace guesswork and sticker shock with real, current numbers. ADU costs in California vary widely by type, size, finish level, and site conditions — a garage conversion sits at one end of the range, a large detached new-construction unit at the other — so understanding the drivers is far more useful than fixating on a single figure.
The biggest cost variables are the ones that happen before finishes: the type of build, how far utilities have to run, whether the lot needs grading or drainage work, and how much structural work the site demands. Two units of the same square footage can differ substantially depending on those factors. That's why Vision ADU publishes honest cost ranges and provides a written, itemized estimate after a free site evaluation rather than a vague per-square-foot quote that falls apart once the work starts.
Financing is the other half of the equation, and it has gotten more creative. Homeowners fund ADUs through cash-out refinances, HELOCs, home equity loans, construction loans, renovation loans, and increasingly ADU-specific products that consider the future rental income of the unit. Each option has different rates, timelines, and qualification rules, and the right choice depends on your equity, your credit, and how quickly you want to move.
With Barak and Jaime's 30+ years of combined construction experience behind the team, our owner-led team has seen how financing decisions ripple through a project — a loan that funds in phases, for example, changes how the build is sequenced. The guides here break down real cost breakdowns by unit type, walk through the major financing paths, and address a question every owner asks: will an ADU raise my property taxes? Pair these guides with our cost-per-square-foot and ROI calculators to turn ranges into numbers that fit your property, so you enter the design stage with a budget you can actually build to.
Use our calculators to turn typical ranges into a number for your project, then check the ROI.
Estimate Your Cost per Sq FtGuides in This Stage
How Much Does an ADU Cost in California? Complete 2026 Guide
After thousands of completed ADU projects across Los Angeles, Orange County, and the Inland Empire, we know what drives costs up and down. This guide explains every variable so you can budget honestly — and tells you how to get a real estimate for your specific property.
ADU Garage Conversion Cost Breakdown: What to Expect in 2026
A practical breakdown of what goes into a garage conversion ADU — what's included in each trade, what makes projects cost more or less, and how to get an accurate written estimate for your specific property in Los Angeles or Orange County.
1,200 Sq Ft ADU Cost Breakdown: What Drives Pricing on a Two-Bedroom California ADU (2026)
A two-bedroom 1,200 square foot ADU is the most common build in California. Here is the honest breakdown of every cost driver — site work, soft costs, finishes, utility hookups — so you know what to ask your builder.
ADU Financing Options in California (2026 Lender Guide)
Every realistic way to finance an ADU in California in 2026 — HELOCs, ADU-specific construction loans, renovation mortgages, cash-out refi, and CalHFA programs. Compare rates, terms, and qualification rules.
Financing Your ADU: 7 Loan Options Compared (HELOC, RenoFi, Construction Loans)
Building an ADU in California requires a property-specific written estimate depending on type. Here are seven proven financing strategies — from HELOCs to construction loans to RenoFi — with pros, cons, and real numbers.
Will Building an ADU Raise My Property Taxes in California?
How ADUs affect property taxes in California -- what triggers reassessment, how much your taxes might increase, and why the math still works in your favor.
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