Construction · Pasadena & Los Angeles
ADU construction
that adds real value.
Detached, attached, and garage-conversion ADUs designed and permitted for Los Angeles County — built to add space, income, or flexibility.
Overview
More space, handled from permit to keys.
Accessory dwelling units are one of the smartest ways to add value to a property. We navigate the evolving ADU rules in LA County and design units that maximize your lot and budget.
From feasibility and design through permitting and construction, we manage the whole ADU process so you can move forward with clarity and confidence.
What's Included
Every ADU type, fully managed.
Detached ADUs
Standalone units optimized for your lot and setbacks.
Attached & Garage Conversions
Smart conversions that reuse existing structure.
Feasibility & Permitting
We confirm what’s allowed and handle approvals.
Turnkey Construction
Design, build, and finish under one roof.
Why ATP
One accountable team,
start to finish.
Related Services
Explore the full scope.
Residential Construction
Ground-up homes & additions
Explore →ADU Construction
Accessory dwelling units
Explore →Commercial Construction
Tenant & ground-up commercial
Explore →Multi-Family Development
Apartments & townhomes
Explore →Hillside Construction
Complex grade & caisson builds
Explore →Home Remodeling
Renovations & whole-home remodels
Explore →Grading
Site preparation & earthwork
Explore →Foundation & Caisson
Foundations & deep piers
Explore →Framing
Precise structural framing
Explore →Mechanical, Electrical & Plumbing
Building systems install
Explore →Retaining Wall
Engineered retaining systems
Explore →
Unlock your lot’s potential.
Wondering if an ADU works on your property? Let’s review your options together.