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ADU tips & guides

Practical advice on planning, budgeting, and building a backyard home — from first idea to final permit.

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Stay, sell, renovate, or build? Most homeowners are asking the wrong question.

We built a decision tool, then stress-tested it on four real Bay Area situations. Here's what it found.

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Home Design

Blog

Latest articles

Guides on costs, permits, financing, and floor plans — plus stories from real ADU builds.

image of a door frame on a meadow to symbolize an unpermitted unit
ADU

How to Prove Your Unpermitted ADU Existed Before 2020 (AB 2533 Evidence Guide)

California's AB 2533 lets you legalize a pre-2020 unpermitted ADU, but the burden of proof is on you. Here's exactly where to look.

how big is 1000 square feet
ADU

How big is 1000 square feet? Prepare to Be Surprised.

See exactly how big 1000 square feet (1000 sq ft) really is, room by room, with dimensions, comparisons, and ADU floor plan ideas to match.

ADU construction
ADU

ADU Construction: A Complete Step-by-Step Guide to Building an Accessory Dwelling Unit

A complete step-by-step guide to ADU construction, from first consultation and permits to costs, build stages, and final move-in day.

ADU floor plan illustration by Home WiP
ADU

ADU Plan: Your Complete Guide to a Ready-to-Permit Floor Plan

Everything you need to choose an ADU plan, from 200 to 1,000 sq ft ready-to-permit floor plans to design tips and the permitting process.

One bedroom modular ADU on a crane
ADU

Buying a Modular Home: 6 Surprising Phases To Be Ready For

What buying a modular home really involves: the six phases from design to install, plus how to avoid losing money and vet your builder.

Small dwelling above garage
Accessory Buildings

Short Guide To Building ADU Above Garage

How to build an ADU above a garage: costs, structural and permit considerations, layout ideas, and whether it is right for your lot.

playing with granny
ADU

Granny Pods as a solution for independent retirees

What granny pods are, what they cost, and how these backyard units give aging parents independence with safety and accessibility close to home.

Looking at checklist for new home construction
ADU

Construction Contract Checklist: Quick and Smart Review

A quick, smart checklist for reviewing your construction contract: scope, payment terms, change orders, and the clauses that protect you.

Popular ADU designs in 2026
ADU

Popular ADU Designs In 2026

The most popular ADU designs in 2026: modern, traditional, and compact styles, with layout ideas to fit your lot, budget, and goals.

400 square feet ADU exterior with flat roof
ADU

How big is 400 square feet house? Plans and Designs.

See how big 400 square feet really is, with smart ADU floor plans, design ideas, and tips to make a compact 400 sq ft home feel spacious.