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
Room Additions
Expand living space with structural clarity, permitted construction, and finishes that match the existing home.
Service Overview
What this service includes
A successful addition respects structure, drainage, and the architecture of the house you already own.
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.
We serve homeowners who want one licensed GC accountable from design coordination through final inspection.
- Typical project size
- $150K – $500K
- Typical duration
- 3 – 8 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
Room Additions 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
Many do — especially when opening walls, tying into existing foundations, or adding loads. We identify engineering needs during evaluation.
Yes. Matching roof lines, siding, windows, and interior finishes is part of planning. Exact match depends on material availability and age of the home.
Expect temporary access limits and noise during framing and MEP. We protect occupied areas and communicate weekly milestones.
Permits
Common permit information
Permit requirements for room additions 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
Room Additions projects
Whole Home
Laguna Beach Whole Home
Laguna Beach
Custom Home
Malibu Custom Home
Malibu
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