A Complete Build From Ground Up

Accessory dwelling unit construction in Washington County managed as a full ground-up project with site prep, framing, and finish work.

You want a separate living space on your property that functions like a real home, not a converted garage. An accessory dwelling unit in Washington County gives you rental income, guest quarters, or housing for family members without the expense of buying a second property. Kartchco Construction builds ADUs from the ground up, handling everything from site grading to final walk-through.

We manage the entire build including foundation work, framing, plumbing, electrical, and HVAC installation. Each unit is designed to meet local zoning requirements and built for long-term durability under Washington County conditions. You work with us on floor plan layout, window placement, finish materials, and exterior style so the ADU fits your property and serves the purpose you have in mind.

If you are thinking about adding an ADU and want to review what your lot can support, reach out to Kartchco Construction to schedule a feasibility review.

How We Build Your Accessory Dwelling Unit

Your ADU starts with site preparation that accounts for existing utilities, drainage, and setback distances in Washington County. We clear and level the build area, coordinate utility connections, and pour a foundation that matches soil conditions. Once the slab cures, we frame the walls, install roofing, and rough in plumbing and electrical before insulation and drywall go up.

When construction is complete, you will have a self-contained living space with a full kitchen, bathroom, heating and cooling, and its own entrance. The unit will look like it belongs on your property and meet the same building standards as your main home.

We also handle finish work including flooring, cabinetry, fixtures, and paint. Final inspections are scheduled once all systems are tested and the unit is ready for occupancy. The ADU is built to last and designed to serve residential or light commercial property needs depending on your zoning.

What Homeowners Usually Want to Know

Before committing to an ADU, most property owners in Washington County ask about zoning limits, construction timelines, and whether the unit can be rented out or used for family.

What zoning rules apply to ADUs in Washington County?
Zoning rules vary by lot size and location, but most residential properties allow one ADU if setbacks and height limits are met. Kartchco Construction reviews your property during the feasibility stage.
How long does it take to build an ADU?
Most accessory dwelling units take three to five months from site prep to final inspection, depending on size and finish complexity. Permit approval and utility coordination can add time.
Can I rent out the ADU once it is finished?
Yes, you can rent the unit as long as your property is zoned for it and the ADU meets local building and safety codes. Some areas require owner occupancy on the property.
What utilities does the ADU need?
The unit needs separate connections for water, sewer or septic, electricity, and gas if you are installing a gas water heater or furnace. We coordinate utility hookups with local providers during the build.
How do you make the ADU match my main house?
We use matching siding, roofing, and trim so the ADU looks intentional and cohesive with your existing home. You approve material selections before we place orders.

Kartchco Construction builds accessory dwelling units in Washington County that function as real homes and hold up under long-term use. If you are ready to talk through layout options and review what your property allows, contact us to schedule a feasibility review.