Inland & East
Building Design &
ADU Plans in Altadena
Altadena is an unincorporated LA County community at the base of the San Gabriel Mountains. Properties here range from flat lots near Lake Avenue to steep hillside parcels approaching the mountains. We’ve designed and permitted projects across this range, including ADUs on challenging hillside sites that required slope analysis and grading compliance.
Why Altadena Clients Work With Us
Altadena’s unincorporated status means projects go through LA County’s building department, and our deep history with county plan check is a direct advantage. The hillside properties require the same slope expertise we’ve demonstrated throughout the San Gabriel Valley foothills.
With over 1,500 residential and commercial projects completed across Los Angeles County in the last decade, we bring a depth of experience that most firms can’t match. We don’t just know the California building code — we know how Altadena’s building department applies it.
Altadena’s hillside properties and unincorporated status create a unique combination of LA County plan check requirements and challenging site conditions.
Our Services in Altadena
ADU Design
Detached ADUs, garage conversions, junior ADUs, and two-story units. Permit-ready plans designed for Alhambra’s specific requirements.
Custom Home Design
Ground-up residential design from modern to traditional. Complete construction documents engineered for permitting.
Additions & Remodels
Room additions, second stories, kitchen and bath redesigns, whole-home renovations. Seamless integration with existing structures.
Plan Check Corrections
Plans stuck in review? We take over stalled projects, resolve code issues, and get permits approved.
Legalize Unpermitted Work
As-built documentation, code compliance analysis, and permit legalization for existing unpermitted additions and conversions.
Commercial Tenant Improvements
Restaurants, retail, offices, and industrial spaces. Functional commercial environments that meet code and reflect your brand.
Start Your Altadena Project
Free consultation. We’ll evaluate your property, discuss feasibility, and give you a clear picture of timeline and cost. No pressure, no obligation.