Custom homes & additions
ADU Construction.
Create a little more independence at home.
New ADUs and conversions planned for California code, utility capacity, and long-term livability . not just square footage.
Coastline DC Inc. · California general contractor · Since 2002
Thoughtful work, from the start
Create a little more independence at home.
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.
What we can plan with you
- Site and access review
- ADU plan coordination
- Foundation and framing
- Kitchen and bathroom construction
- Utility connection planning
- Permit and inspection coordination
The final inclusions are confirmed in your written proposal. Engineering, specialist trade work, and permits are coordinated as the project requires.
A clear way forward
From the first call
to the final walkthrough.
Talk it through
Share your goals, property location, priorities, and the problems you want to solve.
Define the work
Review site conditions, selections, plans, and a written scope before committing to construction.
Build with a plan
Coordinate the work, trades, access, and inspections around the agreed project scope.
Review the details
Walk through the finished work together and identify any remaining agreed items.
Before you begin
Good questions.
Clear next steps.
A little planning now helps you make better decisions about the work ahead.
Can every property add an ADU?
Feasibility depends on zoning, setbacks, lot coverage, utilities, and access. Coastline reviews these during evaluation before design or construction commitments.
How long does ADU permitting take?
Timelines vary by jurisdiction and completeness of plans. We build permit duration into the project schedule and keep you updated at each milestone.
Do you handle garage conversions?
Yes. Garage-to-ADU conversions are a common Coastline scope when structure, insulation, egress, and utilities can meet code.
What affects the cost of adu construction?
Access, existing conditions, dimensions, materials, engineering, and permit requirements all affect the proposal. A site-specific written scope is more useful than an online price guess.
Where do you work?
Our primary service area is Los Angeles County and Ventura County. Tell us the project address so we can confirm fit and availability.
Let's talk about your project
A great result
starts with a conversation.
Tell us what you have in mind and where the work is located. We will review the details and contact you to discuss a site visit and the next steps.
Free initial consultation. Your construction proposal will be based on the actual scope, site conditions, selections, and permit requirements.