Custom homes & additions
Room Additions.
Space for the way your family lives now.
Expand living space with structural clarity, permitted construction, and finishes that match the existing home.
Coastline DC Inc. · California general contractor · Since 2002
Thoughtful work, from the start
Space for the way your family lives now.
Coastline manages room additions as full construction projects: evaluation, engineering coordination when required, permitting, framing, MEP, and finishes.
Single-story expansions and complex connections to existing roofs or foundations are scoped carefully so cost and schedule stay honest.
What we can plan with you
- Site and existing-home review
- Layout coordination
- Foundation and framing
- Window and door openings
- Electrical and HVAC coordination
- Seamless finish transitions
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.
Do room additions always need engineering?
Many do . especially when opening walls, tying into existing foundations, or adding loads. We identify engineering needs during evaluation.
Can an addition match my existing home?
Yes. Matching roof lines, siding, windows, and interior finishes is part of planning. Exact match depends on material availability and age of the home.
How disruptive is construction?
Expect temporary access limits and noise during framing and MEP. We protect occupied areas and communicate weekly milestones.
What affects the cost of room 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.
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.
Plan room additions in your area
We serve the following Los Angeles and Ventura communities. Final scope, access, availability and any required approvals are reviewed for the actual property.