24+ years in operation
Established in 2002. Coastline has delivered projects across Southern California through changing markets, codes, and expectations.
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Coastline Home Services
ADU Construction
New ADUs and conversions planned for California code, utility capacity, and long-term livability — not just square footage.
Service Overview
What this service includes
ADU projects succeed when zoning, utilities, access, and construction sequencing are resolved before mobilization.
Coastline delivers ADU construction as a full GC-managed project: site evaluation, permitting, foundation or conversion scope, framing, MEP, and finishes.
Garage conversions, detached ADUs, and junior ADUs each carry different constraints. We clarify feasibility during evaluation so expectations match the property.
Homeowners across Los Angeles, Ventura, and Orange County use Coastline when they want one accountable contractor from permit through occupancy.
- Typical project size
- $200K – $450K
- Typical duration
- 6 – 12 months
- Permit requirements
- Yes
Why Coastline
Why homeowners choose Coastline
Professional project management
Dedicated project managers, structured communication, and clear milestones from evaluation through completion.
Licensed & insured
California General Contractor License #813394. Fully licensed, bonded, and insured for your protection.
Documented process
Clear digital communication and documented milestones — without replacing the human relationship at the center of every build.
Our Process
From evaluation to completion
Evaluation
We review your project scope, site conditions, and goals before scheduling a site visit.
Planning
Design coordination, permits, selections, and a detailed scope aligned to your vision.
Pre-construction
Scheduling, site protection, material procurement, and mobilization before work begins.
Construction
Managed build with regular updates, inspections, and a dedicated project manager.
Completion
Final walkthrough, punch list resolution, and project handoff.
Project Gallery
ADU Construction in progress and completed
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Before & After
The transformation
Project Video
See the work
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FAQ
Frequently asked questions
Feasibility depends on zoning, setbacks, lot coverage, utilities, and access. Coastline reviews these during evaluation before design or construction commitments.
Timelines vary by jurisdiction and completeness of plans. We build permit duration into the project schedule and keep you updated at each milestone.
Yes. Garage-to-ADU conversions are a common Coastline scope when structure, insulation, egress, and utilities can meet code.
Permits
Common permit information
Permit requirements for adu construction vary by scope and jurisdiction. Coastline identifies requirements during evaluation. Typical permit level: Yes.
Permit assessment
We review your project scope against local building department requirements before construction begins.
Documentation & submission
Coastline prepares and submits permit applications and schedules required inspections.
Licensed execution
All work performed under California General Contractor License #813394.
Related Projects
ADU Construction projects
Custom Home
Malibu Custom Home
Malibu
Outdoor Living
Calabasas Backyard Retreat
Calabasas
Service Areas
Southern California
Coastline serves homeowners across Southern California counties.
Smart Project Evaluation
Smart Project Evaluation
Share photos, plans, or a description of your project. A Coastline project manager reviews your submission and responds within one business day — no obligation.
Begin with a project evaluation
No obligation. Share your project details and a Coastline project manager will respond within one business day.
Request a Project EvaluationOr Contact Coastline · License #813394