Home Addition Projects done by 2A Construction
Custom Home Additions & Framing Done Right
Expert Room Additions • Structural Framing • Permit Assistance
Custom Home Addition Services
Complete construction services to expand and improve your home.
Room Additions
Expand your living space with professionally built room additions.
Structural Framing
Expert framing for new construction and remodeling projects.
Second Story Additions
Add a second story without moving to a new home.
Garage Conversions
Transform your garage into a functional living space.
Selective Demolition
Careful removal of existing structures to make way for new.
Permit Handling
We manage all permits and inspections for your project.
Addition Cost Estimator
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Home Addition
$0
est. total · $300/sq ft
Ready to move forward?
Estimates are preliminary. Final pricing depends on access, prep, and selected upgrades. Min 100, max 10,000 sq ft.
Scope of Work
All materials, labor, and debris removal included.
- Site preparation and clearing of the addition footprint.
- Excavation and grading for foundation work.
- Concrete foundation installation per engineering specifications.
- Structural framing including walls, floor joists, and roof framing.
- Roof installation with shingles to match the existing roof.
- Exterior sheathing and weather barrier installation.
- Window and door installation per plan specifications.
- Electrical rough-in and finish work, including panel upgrade if needed.
- Plumbing rough-in and finish work (if applicable to project scope).
- HVAC extension or new system installation (if applicable).
- Insulation installation to meet or exceed code requirements.
- Drywall installation, taping, and finishing.
- Interior trim work including baseboards, casings, and crown molding.
- Interior and exterior painting to match existing finishes.
- Flooring installation per specifications.
- Exterior siding installation to match or complement existing home.
- Integration with the existing structure for seamless transitions.
- All required inspections and permit coordination.
- Final cleanup and debris removal.
- Final walkthrough and punch list completion.
Note: Final pricing subject to site inspection and permit requirements. Workmanship Warranty Provided.
Home Addition Gallery
Browse our completed home addition projects across the Greater Seattle area.
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