Custom homes & additions
Custom Home Additions.
More room, with the home you love in mind.
Expand living space with additions that feel original to the house . not bolted on.
Coastline DC Inc. · California general contractor · Since 2002
Thoughtful work, from the start
More room, with the home you love in mind.
Coastline evaluates foundations, roof lines, and mechanical capacity before design locks.
Permits and neighbor impacts are planned with the same discipline as new construction.
What we can plan with you
- Existing-home assessment
- Addition and connection scope
- Foundation and framing
- Roofline transitions
- Interior and exterior matching
- Utilities and finish 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.
Will the addition match my existing home?
That is the goal. We document existing materials and details so new work aligns.
Do additions always need permits?
Almost always in our markets. We confirm requirements during evaluation.
Can we live at home during construction?
Often yes, with phasing. Dust control and temporary separations are planned per project.
What affects the cost of custom home additions?
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.
Plan the whole project
Related services.
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.