Ground-Up & Second-Story Additions
More space, seamlessly added.
Whether it is a bump-out, full second story, or detached ADU, our additions match your home’s existing structure, style, and standards.
Home Additions in Eastern Washington
Home Additions done right — the first time.
When the floor plan stops working for your family, an addition adds the right square footage without losing what you love about your home. We handle bump-outs, full second-story additions, attached suites, and detached ADUs across the Tri-Cities and Yakima Valley.
What you get
- Main-level bump-outs (kitchens, sunrooms, primary suites)
- Second-story and over-garage additions
- In-law suites and detached ADUs
- Foundation, framing, roof tie-in, mechanical and finish — one team
- Architectural and engineering coordination as needed
Our process
- 01
Feasibility check
We assess your lot, setbacks, and existing structure to confirm scope.
- 02
Plans & permits
We coordinate plans (yours or ours) and pull every permit through city or county.
- 03
Foundation & framing
Footings, slab, rough frame, and roof tie-in — sequenced for minimum impact on the existing house.
- 04
MEP & finish
Electric, plumbing, HVAC, insulation, drywall, paint, flooring — all by our team.
- 05
Final inspection
We walk the addition with the inspector and you, then hand you keys.
Why homeowners pick us
Additions live or die on how cleanly the new structure meets the old. We sweat the flashing, the floor heights, and the trim returns so it looks like the home always had it.
Frequently Asked
Common questions.
Don’t see your question? Give us a call — we’re happy to talk it through.
A typical bump-out runs 10–16 weeks; second-story additions and ADUs run 4–7 months depending on scope.
Most additions benefit from architectural drawings. We can recommend local architects or use plans you already have.
Yes — siding profiles, rooflines, window styles, and trim are matched intentionally so the addition looks original.
Ready to Start
Tell us about your additions project.
No high-pressure sales, no surprise fees — just a real conversation about what you want to build.
5-Star Reviews on Google
Neighbors who trust us — and tell their neighbors.
“Antonio and his crew put a new roof on our home and you can tell the difference in craftsmanship. They were quick, clean, and treated our house like their own.”
Alex Rietmann
Pasco, WA
“AR Construction did a full kitchen remodel for us. Communication was excellent, the schedule was honest, and the finished work is gorgeous. Highly recommend.”
Janis Swoboda
Kennewick, WA
“They replaced all of our siding and windows. The team showed up on time every day, kept the site tidy, and finished ahead of schedule. The house looks brand new.”
Jodi Christiansen
Richland, WA
Free Estimates
Let's build something great together.
Tell us about your project — we will get back to you with a clear, honest plan.
Mon–Fri 7:00 AM – 5:00 PM · Serving all of Eastern Washington · Licensed & Bonded