Accessory dwelling unit floor plans are the single most consequential design decision you will make in your entire ADU project. The layout you choose determines your construction budget, your rental income potential, your permit timeline, and how comfortable your unit will be to live in for decades.
Getting an accessory dwelling unit permit is the single most important step between having an ADU idea and owning a legal, rentable, insurable secondary dwelling. This complete guide walks you through every stage of the permit process — from zoning research and plan preparation to inspections,
Accessory Dwelling Unit Designs: The Complete Guide to Every Style, Layout & Build Path
Explore every type of ADU design — from detached backyard cottages and garage conversions to prefab units and JADUs — with real cost data, space-planning
A 2 story ADU — a two-story accessory dwelling unit — is one of the most efficient housing solutions available to homeowners today. By growing vertically instead of horizontally, a two-story ADU maximizes livable square footage while preserving outdoor space, generates strong rental income, and can add significant value
800 Sq Ft ADU Cost: What to Budget in 2025
The 800 sq ft ADU cost — meaning the total expense to design, permit, and build an 800 square foot accessory dwelling unit — typically falls between $160,000 and $400,000 in 2025, depending on your location, construction method, and finish level. Understanding






