How much does it cost to build a house in Downey?

A new 1,800 sq ft, 3-bedroom home costs about $873,000 to build, all in, including building, site work, city fees and design. Land is extra: about $487,500 for a typical lot in areas like Downey.

What is a new home worth in Downey?

About $1,462,500 for a new 1,800 sq ft home in an area like Downey.

What a new home costs in Downey (2026)

Building a new custom home, tearing down and rebuilding, or rebuilding after a fire in Downey? Hemisphere A&E is an architecture and design-build firm: one team for design, permits and construction. Here are typical numbers, the local rules, and your next step.

Typical new home numbers in Downey

A new 1,800 sq ft, 3-bedroom home costs about $873,000 to build, all in: building, site work, city fees and design. Land is extra.
Typical land value for a lot in areas like Downey: about $487,500.
Finished value: about $1,462,500 (about $650 per sq ft plus a new-home premium).
A new home like this could rent for about $6,750 a month.

Run the free new home cost calculator for Downey

Building permits and local rules in Downey

Who runs permits

City of Downey Community Development: Planning and the Building and Safety Division, with Downey Fire and Public Works.

SB 9 and lot splits

California law (SB 9) can allow a second home or a lot split on many single-family lots. Hillside, fire and historic rules can limit it.

What can slow you down

Grading, solar and fire sprinklers need separate permits.
Fire and Public Works also review each project.

Free lot check in Downey

Send Hemisphere A&E your address. We look up your zoning and lot size, what fits (ADU, junior ADU, SB 9, new home, apartments, remodel or business space), red flags like fire zones or hillside rules, and a rough cost range. No cost, no pressure. Email info@hemisphereae.com or call (619) 762-7144.