- Typical cost
- $400 – $800+ per square foot depending on site and finish level
- Typical timeline
- 18–30 months including entitlement and permitting
- Permits through
- LA County Building & Safety
- Service area
- Altadena, San Gabriel Valley
Ground-Up Construction
Full-service design-build on your lot: feasibility, architecture, engineering, entitlement, permits and construction with our own crews and long-standing subs.
- New single-family custom homes
- SB9 lot splits and two-unit developments
- Hillside and view-lot construction
- Tear-down and rebuild projects
- Multi-unit residential
Custom New Construction Conditions in Altadena
We do a lot of rebuild and repair work here, and the pattern is consistent: fire-hardened exteriors, upgraded defensible space, and a structure brought up to current code rather than restored as it was. Homes date largely from 1910 to 1950, so foundations are often unbolted, and slope and drainage matter on the upper streets closer to the mountains.
- Los Angeles County Building & Safety permits, not a city process
- Very High Fire Hazard Severity Zone materials and assemblies
- Fire rebuild and repair work brought fully up to current code
- 1910 to 1950 homes with unbolted foundations and original wiring
- Slope, drainage and brush clearance on foothill-adjacent streets
Start With the Lot
Before design, we look at what the parcel actually allows: zoning and FAR, height limits, setbacks, hillside ordinance, fire-severity zone, soils, and whether utilities are at the street. It's cheaper to find out now than after plans are drawn.
- Zoning, FAR and height analysis
- Soils and geotechnical reports
- Hillside ordinance and grading review
- Utility availability and connection costs
- SB9 eligibility for lot splits
How We Keep It Predictable
Design-build means the people who drew it are accountable for building it on budget, with no finger-pointing between an outside architect and the builder when something doesn't fit. You get a fixed-price proposal with specifications and a milestone schedule you can track in your portal.
- Single accountable team from design to keys
- Fixed-price proposal with real specifications
- Milestone payment schedule
- Client portal with schedule, approvals and photos
FREQUENTLY ASKED QUESTIONS
Do you do custom new construction in Altadena?
Yes. Altadena is part of our regular service area. We'll come out for a free on-site consultation, walk the property, and tell you what's realistic before you spend anything on design.
What does custom new construction cost in Altadena?
$400 – $800+ per square foot depending on site and finish level. Site conditions in Altadena and your material selections move the number, which is why we price after walking the property rather than over the phone.
Who issues the permit in Altadena?
Permits for this work go through LA County Building & Safety. We handle the submittal, plan check corrections and inspections as part of the project.
How much does it cost to build a custom home in Los Angeles?
Custom homes in LA typically run $400 to $800+ per square foot. Hillside lots, deep foundations and high-end finishes push it higher; a flat lot with straightforward access keeps it lower.
How long does it take to build a custom home?
Plan on 18 to 30 months from first design meeting to move-in, with entitlement and plan check often taking as long as construction.
Do you handle SB9 lot splits?
Yes. We handle SB9 lot splits and two-unit urban lot developments end to end, eligibility review, parcel maps, permits and construction.
Do you build custom homes near me in Ventura or Orange County?
Yes. We're a design-build new home construction company based in Woodland Hills, and we build custom homes across Los Angeles County, Ventura County and Orange County, anywhere within about 100 miles of our office.
Similar Projects We've Built
New 4,800 sq ft Custom Home on a Calabasas Hillside
Ground-up construction of a 4,800 sq ft home on a graded hillside pad, including caisson foundations, retaining walls and a full site build-out.
New Custom Coastal Home in Pacific Palisades
Ground-up construction of a 5,200 sq ft coastal modern home on a canyon-edge lot, including a courtyard, pool and full site build-out.
New 3,600 sq ft Custom Home in Irvine
Tear-down and ground-up rebuild of a 1970s tract home into a two-story contemporary with a courtyard and detached garage.
DISCUSS YOUR PROJECT WITH 1 SMART BUILD
Licensed, bonded and insured design-build general contractor serving Los Angeles County and Southern California. Tell us about your property and goals, and we'll walk you through feasibility, permitting and a clear plan.