Build Your Custom California ADU with Guaranteed Permitting & Turnkey Construction
From site feasibility and architectural engineering to city permits and master craftsmanship—PeakADU delivers turnkey backyard homes with fixed-price transparency.
- 100% In-House Architectural Design, Engineering & Expediting
- Guaranteed Turnkey Fixed Pricing — No Mid-Build Change Orders
- Fast-Tracked Permitting & Dedicated California Project Manager
Request Free ADU Consultation
Get an instant lot feasibility review & preliminary turnkey cost estimate.
How Southern California Homeowners Are Using ADUs
Homeowners choose accessory units for many reasons: rental income, multigenerational living, or flexible custom space. Explore real homeowner experiences and see what's possible on your property.
Turn Unused Backyard Space Into Rental Income
Building an Accessory Dwelling Unit (ADU) can turn unused space on your property into an income-producing asset. A rental ADU can provide a separate living space with its own bedroom, bathroom, kitchen, living area, and private entrance.
Rental income from an ADU may help offset your mortgage and other property expenses while creating an additional source of monthly income. The potential depends on local rents, construction costs, financing, property layout, and local ADU regulations.
Peak ADU helps Southern California homeowners determine what’s possible on their property and guides the entire process through design, permitting, and construction.
Turnkey ADU Building Done Right
We eliminate the stress of dealing with separate architects, engineers, city plan checkers, and subcontractors. Everything is coordinated under one expert roof.
Turnkey Architectural Design
Tailored floor plans optimized for your lot's setbacks, solar orientation, privacy, and California building codes.
Guaranteed City Permitting
In-house permitting expediting across all California municipalities, navigating SB 9 and AB 1033 with zero delays.
Fixed-Price Transparency
Itemized construction contracts with zero hidden fees. Site prep, foundations, framing, and finishes all included.
Rental Yield & Equity Boost
Depending on your property and local market, an ADU could generate $2,500–$4,500/month in rental income and potentially add $300,000+ in property value.
What California Homeowners Say
From family suites to passive rental cash cows, read how our clients expanded their living spaces with PeakADU.
"PeakADU made building our backyard home effortless. They handled city permitting in Carlsbad in record time, and the fixed-price guarantee gave us peace of mind. We rented it out within 2 weeks of completion for $3,400/month!"
"I was nervous about utility hookups and coastal commission rules, but PeakADU’s engineering team had everything dialled in from day one. Flawless construction, clean work site, and on-time handover."
"We built a two-story ADU for our aging parents. The accessibility design, elevator prep, and modern kitchen are incredible. PeakADU treats your property with genuine respect."
Check Your Property’s ADU Potential
Enter your property address and contact details to receive a complimentary zoning, setback, and utility feasibility breakdown within 24 hours.
ADU Models Built for California Properties
Choose from architect-crafted standard floor plans or design a fully custom structure matched to your parcel.
Most PopularDetached ADU
Stand-alone backyard home offering maximum privacy for long-term rental income or guest suites.
Home AdditionAttached ADU
Seamlessly connected addition sharing one or more walls with your main residence with private entry.
Fastest BuildGarage Conversion
Transform an underutilized 2-car garage into a vibrant living space utilizing existing foundation and roof.
Max FootprintTwo-Story ADU
Maximize yard space with vertical living, rooftop decks, and scenic canyon or coastal views.
The PeakADU 4-Step Process
How we take your ADU from an empty backyard parcel to a finished, move-in-ready home.
Feasibility & Site Assessment
We review your parcel zoning, property setbacks, sewer depth, electrical capacity, and generate your preliminary budget.
Architecture & 3D Engineering
Our architects produce full permit-ready blueprints, Title 24 energy calculations, and structural engineering packages.
City Permitting & Approvals
We submit plans directly to your city building department, managing plan check reviews and revisions until your permit is issued.
Turnkey Construction & Handover
Our licensed builders execute grading, foundation, framing, plumbing, solar, and designer finishes through final inspection.
Have Questions About Your Lot?
Want quick answers on setbacks, easements, utility connections, or financing? Enter your phone number for a complimentary 15-minute feasibility call.
Frequently Asked Questions
Everything you need to know about building, permitting, and financing an ADU in California.
Turnkey ADU construction in California typically ranges from $180,000 for garage conversions up to $350,000–$450,000+ for larger custom 2–3 bedroom detached units. PeakADU provides transparent, fixed-price contracts that include site assessment, architectural plans, structural engineering, municipal permitting fees, utility trenching, and full turnkey construction with premium finishes.