Permit-Ready 1-Bedroom ADU Floor Plans
Build the perfect single-renter or in-law suite with our 1-bedroom ADU layouts. Ranging from 400 to 600 square feet, these permit-ready designs combine full kitchens, in-unit laundry, and private master bedrooms to maximize space without compromising comfort.
Detached 
The Solana
$997Compact yet incredibly open, this studio layout features a full kitchen, 3-piece bathroom, and built-in closet space. Engineered for rapid permitting and ideal for backyard rentals or a private home office.
- ✓ Vaulted Ceilings
- ✓ Full Kitchen
- ✓ Mini-Split HVAC Ready
- ✓ In-Unit Laundry
Garage Conversion The Ventura
$997Turn your 2-car garage into permitted living space. Pre-designed to utilize the existing concrete slab and roofline, featuring a living room, bedroom area, and compact full kitchen.
- ✓ Uses Existing Slab
- ✓ Fits Standard 2-Car Garage
- ✓ Egress Window Compliance
- ✓ NEC Panel Upgrade Plan
Attached The Monterey
$997Designed specifically to attach to a primary residence as an addition or in-law suite. Features a private side-entry, full kitchenette, open living room, and shared wall acoustic framing details.
- ✓ Private Entry
- ✓ Acoustic Wall Framing
- ✓ Kitchenette
- ✓ Vaulted Ceilings
Detached The Laguna
$997Our most popular one-bedroom ADU layout. Designed with an open-concept living area, a spacious master bedroom that easily fits a queen size bed, a walk-in shower, and dedicated dining space.
- ✓ Queen Bed Bedroom
- ✓ Open Concept Living
- ✓ L-Shaped Kitchen
- ✓ Solar Ready
State-by-State Compliance
ADU Stamp Rules & Legislation Guidelines
Understanding engineering requirements and permit pathways across our core states.
Arizona (AZ)
✓ No Stamp RequiredArizona SB 1161 (2022) prohibits cities from banning ADUs outright. Local jurisdictions may regulate size, setbacks, and design but cannot prohibit ADUs entirely. Most permits are ministerial. Architect stamp generally not required for single-family residential projects. Phoenix, Scottsdale, and Tucson have streamlined ADU permitting programs.
California (CA)
⚠ Stamp RequiredCalifornia has the most permissive ADU laws in the US. State law preempts most local restrictions. ADUs up to 1,200 sq ft allowed. JADUs up to 500 sq ft permitted. No owner-occupancy requirement through 2025. Ministerial approval required — no discretionary review. Stamped drawings required for permit submission in most jurisdictions.
Colorado (CO)
⚠ Stamp RequiredColorado HB 24-1152 (2024) requires all municipalities with populations over 1,000 to allow ADUs by right in single-family zones. Effective July 2025. Detached ADUs up to 1,000 sq ft permitted. Garage conversions and attached ADUs also covered. Licensed architect or engineer stamp required for permit submission statewide.
Florida (FL)
✓ No Stamp RequiredFlorida passed HB 1339 in 2023 requiring most municipalities to allow ADUs in single-family zones. ADUs generally capped at 1,000 sq ft or 60% of primary home size. Garage conversions widely permitted. Architect stamp not required for most residential projects under 7,500 sq ft per Florida Statute 481.229.
Oregon (OR)
⚠ Stamp RequiredOregon HB 2001 (2019) legalized ADUs statewide as a matter of right in cities over 2,500. Oregon SB 1045 removed owner-occupancy requirements. Most cities cap detached ADUs at 900 sq ft. Garage conversions widely permitted. Engineer or architect stamp required for structural drawings in Oregon residential projects.
Texas (TX)
✓ No Stamp RequiredTexas has no statewide ADU law — regulations are set by individual cities and counties. Austin, Houston, and Dallas have ADU-friendly policies. Rural areas are generally permissive. Stamp requirements vary by jurisdiction; most cities under 50,000 population do not require a licensed architect stamp for residential projects under a certain threshold.
Washington (WA)
⚠ Stamp RequiredWashington HB 1337 (2023) requires all cities and counties to allow at least two ADUs per single-family lot. DADUs up to 1,000 sq ft and attached ADUs up to 1,000 sq ft permitted by right. No owner-occupancy requirement. Architect or engineer stamp required for building permit in most Washington jurisdictions. Effective July 2024.
The Done-For-You Path
Want Your Your Property ADU Fully Done For You?
Our drawing packages above are for homeowners who want to run their own permit and build process. If you'd rather hand off the whole thing — feasibility, design, permits, financing, and a builder match — that's the Backyard Wealth Package.
We turn your backyard into a rental unit. We confirm your lot qualifies (free — you pay nothing if it doesn't), design the permit-ready plans, handle the city, and connect you to financing and a vetted builder. One flat fee — about what an architect charges just to start.
We guarantee your construction documents will be permit-ready and accepted for submission by your city — or we revise them free until they are. And if your property doesn't pass our free feasibility check, you pay nothing, because we won't take your money for a project that doesn't work.
We won't even take your money unless your property qualifies.
Frequently Asked Questions
Category Details & Build Advice
What is the ideal size for a 1-bedroom ADU?
The sweet spot for a 1-bedroom ADU is between 450 and 600 square feet. This size allows for a dedicated bedroom (large enough for a queen-size bed), a comfortable living area, a full-size kitchen, and stackable laundry, while staying within setbacks.
How much does it cost to build a 1-bedroom ADU?
Construction costs range between $150,000 and $250,000 depending on your location, site conditions, utility hookups, and finish level. Garage conversions are on the lower end, while brand-new detached builds cost more due to foundation and utility work.
What is the maximum size for a 1-bedroom ADU?
State laws generally allow ADUs up to 800 or 1,000 sq ft by right, but for a 1-bedroom layout, exceeding 650 sq ft often leads to excess unused space. If you want to build larger than 700 sq ft, we recommend moving to a 2-bedroom layout to maximize resale value and tenant demand.
Local Guides
ADU Permitting Guides by City
Select your local city to review site check timeline, rental yield data, and building department URLs.