ADU & Home Building Guides
Plain-English guides that answer the questions homeowners ask before they build — what an ADU or modular home costs, how the build process and permitting work, what a unit rents for and when it pays back, and how to rent it out once it's finished. Each guide owns one topic in depth, with dated 2026 figures for California, Oregon, Washington, Nevada, Arizona and Idaho.
Where to begin
Most people arrive with one question. Here's the fastest route to the guide that answers it — and a sensible order if you're researching the whole project.
The guides people open first
The four questions that decide most projects: cost, process, return, and renting it out. If you read nothing else, read these.
What Is an ADU? Types, Sizes & Rules (2026)
The plain-English definition: what legally counts as an accessory dwelling unit, the five types, size limits and what they rent for.
What Drives ADU Cost? A Complete Budget Breakdown
The factors that actually set an ADU budget — by type, line by line — and which items blow projects off course.
How Much Can I Rent My ADU For? 2026 Rent Benchmarks
Rent benchmarks by size and type, the features that move the number, and how to price without sitting vacant.
ADU Rental Income & ROI
What an ADU rents for by size, how ROI and payback work, the holding costs to plan for, and a free ROI calculator.
ROI & Value
Whether the math works: what a unit rents for, payback periods, holding costs, and how the return actually adds up over time.
Budget & Financing
What actually drives a home, ADU or modular budget — where the money goes, how projects get financed, and what moves the number on your lot.
What Drives ADU Cost? A Complete Budget Breakdown
The factors that actually set an ADU budget — by type, line by line — and which items blow projects off course.
How to Finance an ADU: Loans, HELOCs & Grants (2026)
Every realistic way to pay for an ADU, and which lenders will underwrite the rent the unit has not earned yet.
Prefab vs Custom ADU: Speed, Access & Quality Compared
Factory-built units save time — but only if your lot can take delivery. The honest comparison.
Process & Permits
Feasibility, design, permitting and construction: how a project moves from an empty lot to a finished, inspected home.
What Is an ADU? Types, Sizes & Rules (2026)
The plain-English definition: what legally counts as an accessory dwelling unit, the five types, size limits and what they rent for.
Junior ADU vs Full ADU: Which Should You Build?
A JADU is the fastest legal unit but is capped at 500 sq ft with strings attached. Here is exactly where each one wins.
Detached ADU vs Garage Conversion: Rent & Trade-Offs
The garage looks cheaper — sometimes it is. The slab, the ceiling height and the rent ceiling decide it.
California ADU Laws in 2026: What Changed & What It Means
The state protections that override your city: what a jurisdiction can and cannot require of your ADU.
ADU Permits, Setbacks & Zoning: The Complete Walkthrough
From zoning check to final inspection: every step, every document, and the four things that cause most rejections.
How Long Does It Take to Build an ADU? Realistic Timeline
Nine to fourteen months door to door for a detached unit. Here is where every month goes.
Pre-Approved ADU Plans: Are They Worth It?
Cities publish pre-checked plan sets that skip most of plan check. Real time savings — with real constraints.
Renting & Management
Turning a finished unit into income — leasing, tenant screening, and whether to self-manage or hire a professional partner.
How Much Can I Rent My ADU For? 2026 Rent Benchmarks
Rent benchmarks by size and type, the features that move the number, and how to price without sitting vacant.
Self-Manage or Hire a Manager for Your ADU?
A manager costs 8–10% of rent. Here is exactly what that buys and when it is worth it — especially with a tenant in your backyard.
When you're ready to price a real build
These guides cover the market-wide picture. When you want our actual numbers and next steps, here's where each thread continues.
Our published prices
Most builders hide pricing. We publish starting prices by model and size, and what's included in every build.
See model pricingEstimate your return
Run your own rent, payment and holding costs through our ADU ROI calculator in about two minutes.
Open the ROI calculatorCheck your lot
A free feasibility check tells you what is buildable at your address and what it costs — before you spend a dollar on design.
Book a feasibility checkHow we write these guides
Every guide is written and reviewed by the Homeland Building & Development team — licensed, bonded and insured builders who pull permits and run these numbers on real projects across six states. We use dated 2026 figures, flag when a rule varies by jurisdiction, and update pages when the law or the market moves. This is general education, not legal, financial or tax advice; we confirm the exact rules for your address during a free feasibility check.