An architectural plot plan showing a proposed ADU layout with a drafting compass and triangular scale ruler on a wooden desk, looking out through large windows toward a landscaped backyard and modern cedar studio cottage

ADU Permits & Approval Process: Step-by-Step Guide

An accessory dwelling unit (ADU) permit is the legal approval a California city or county issues

Architectural floor plan blueprints with house keys, a pencil, and a tape measure resting on a wooden sawhorse table in front of an active timber-framed ADU under construction

How to Choose an ADU Contractor: Hiring & Build Process Guide

An ADU contractor is a licensed builder who designs, permits, and constructs accessory dwelling units on

A set of rolled architectural blueprints, a calculator, and eyeglasses resting on an outdoor table overlooking a completed modern prefab ADU with glowing interior lights at sunset

ADU Financing & Insurance: Loans & Coverage Options

An accessory dwelling unit is a legal second home built on a single-family lot, and financing

A rolled set of architectural blueprints tied with twine and an extended metal tape measure resting on an outdoor table in front of a modern timber-clad backyard ADU at sunset

How Much Does an ADU Cost? Complete Breakdown & Budget Guide

An ADU in California typically costs $150,000 to $400,000 to build, depending on size, type, and

A contemporary wood-clad backyard ADU with floor-to-ceiling glass windows and clerestory lighting, situated next to a permeable grid paver driveway, drought-tolerant succulent landscaping, and a manicured green lawn at golden hour

ADU Parking Requirement & Site Layout Guide

Parking is the single most misunderstood part of ADU planning, and it stops more projects at

A bright modern living room with hardwood floors and black-framed sliding glass doors opening onto a sunlit wooden patio and lush green garden

ADU Windows & Doors: Complete Selection Guide (2026)

The windows and doors on an accessory dwelling unit do more work than people expect from

A cutaway view of a standing seam metal roof under construction, showing black metal roofing panels, synthetic underlayment, wooden roof deck sheathing, and perimeter drip edge flashing

ADU Roofing Types & Systems Guide

The right ADU roof does more than shed rain. It determines how long your structure lasts,

A modern prefab backyard ADU featuring vertical natural cedar wood siding, matte charcoal standing seam metal cladding, corner picture windows, and a landscaped patio with outdoor seating

ADU Siding & Cladding Options Guide

Fiber cement siding lasts 30 to 50 years and resists fire, rot, and pests better than

An open-concept ADU interior featuring a modern walnut kitchen with a waterfall quartz island, adjacent living room with neutral boucle seating, and a vaulted ceiling with an exposed wood beam

ADU Interior Finishes & Design Guide

The finishes inside an accessory dwelling unit determine whether it feels like a cramped afterthought or

Under-stair storage drawers and built-in bookshelf in a modern compact ADU interior

ADU Storage Solutions & Space-Saving Ideas

An ADU with smart storage feels twice its actual size. The difference between a cramped accessory