ADU Contractor in Downey
Build Construction Corporation is a licensed general contractor building ADUs and garage conversions for Downey homeowners. We handle design, permits, and construction — fully in-house.
Downey's larger residential lots and family-friendly neighborhoods make it a strong market for ADU construction. Whether you want to add a backyard cottage to rent, provide housing for aging parents, or create a home office with separate access, an ADU in Downey can deliver both income and lifestyle flexibility.
Our team has experience with Downey's building department and can guide you through the entire process — from initial feasibility review and design through permit approval and construction. We use our own licensed crews and trusted subcontractors to deliver consistent quality on every project.
Many of our Downey clients are surprised by how quickly an ADU can pay for itself through rental income. We'll walk you through realistic numbers during your free consultation.
- Detached ADUs up to 1,200 sq ft in Downey
- Garage and accessory structure conversions
- Attached ADUs and second-story additions
- Permit handling with City of Downey
- Licensed, bonded, and insured — CSLB #1124836
- Free property review — no obligation, no cost
How it works
Financing available
Homeowners may consider a HELOC, cash-out refinance, or construction loan. Financing is offered by third-party lenders and is subject to lender approval, rates, terms, and availability. Build Construction is not a lender.
Ask us about financingFrequently asked questions
See what you can build on your property
Use our free calculator to check eligibility, estimated rental income, and project options in about two minutes.