Marsing sits on the Snake River at the edge of Owyhee County, with the Sunny Slope wine country to the north and the Owyhee foothills rising to the south. It is a genuinely scenic place to build and a different permitting environment from the Ada and Canyon County side of the river.
We build custom homes, renovate existing houses, and put up shops and detached garages throughout the Marsing area.
- Permitting authority
- City of Marsing, with Owyhee County for rural parcels
- Water & sewer
- Largely well and septic outside the city
- Terrain
- Snake River corridor and Owyhee foothills
- ZIP codes
- 83639
- Where we work in Marsing
- Marsing townsite · Snake River corridor · Owyhee benchland · Sunny Slope area
What we find in Marsing homes
Marsing’s housing runs from small older homes in the townsite to farmhouses and ranch properties on acreage, manufactured homes, and a growing number of newer custom builds on benchland and hillside parcels chosen for the views. The older stock needs the systems work typical of rural Idaho housing. The newer acreage builds are where the site work — access, water, septic, and power — dominates the front end of the project.
Permitting and planning in Marsing
The City of Marsing permits within city limits; Owyhee County handles the surrounding rural parcels under its own standards, which differ from Canyon County across the river. Wells and septic systems with district health approval are the norm on acreage. Parcels along the Snake River may carry mapped floodplain worth confirming before design, and hillside and benchland sites need attention to access, grading, and drainage. Power service distance is a genuine budget item on parcels set well back from maintained roads.
What we build in Marsing
Home Remodeling & Renovation
From a one-room addition to a complete interior and exterior renovation, we guide the project from concept to completion.
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Kitchen Remodeling
A well-designed kitchen is the social center of your home. We handle design, cabinets, counters, lighting and flooring.
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Bathroom Remodeling
Thoughtful planning and attention to detail are the keys to any bathroom remodel — from a guest bath to a full primary suite.
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Custom New Home Construction
From the first plan sketch to the day you move in — custom homes built to your site, your budget, and the way you actually live.
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Design & Build
One team, one contract, one continuous flow of work from the first concept through to the final punch list.
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Shops, Garages & ADUs
RV shops, detached garages, metal buildings, and accessory dwelling units — the outbuildings Idaho property actually gets used for.
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Commercial Remodel & Tenant Improvements
Office, retail, restaurant, and industrial build-outs — including phased work in spaces that have to stay open.
Learn moreBuilding in Marsing: common questions
Do you build in Owyhee County?
Yes. Marsing and Homedale are both within our service area, and we are familiar with building on the Owyhee side of the river — the standards and the site conditions are genuinely different from Canyon County.
What should I expect building on a benchland or hillside lot here?
Access and site work drive the budget. Expect a graded and surfaced driveway, an engineered foundation if the slope requires it, real drainage design, a drilled well, septic with district health approval, and power service that may run a considerable distance.
Can you build a shop with an apartment?
Sometimes, depending on the parcel’s zoning and whether the county treats the living portion as a permitted dwelling. That determination changes septic sizing and the whole permitting path, so it is the first question we answer.
What our clients say about GW Construction
We specialise in helping clients get the biggest return on their investment — and we’d welcome the chance to give you a custom evaluation of your home.
“The finished work was excellent, delivered on time, and inside our budget. What more is there to ask?”
Our experience with GW Construction was outstanding from beginning to end. They were recommended to us by a real estate agent we trusted, who was helping us plan a remodel of a home we had just purchased. Past contractors had been hit or miss for us, so committing to a renovation north of $70,000 made us genuinely nervous. That changed at the first meeting. Derek listened carefully to what we wanted the remodel to accomplish and then carried the plan out faithfully. Just as valuable, he offered real insight where he saw a way to improve on our thinking, and told us plainly when an idea of ours was not economically sensible or carried a downside we had not considered. He was straightforward, transparent, and respectful throughout. Communication was excellent — calls, emails, and texts were returned promptly. He even introduced us to each of the subcontractors so we could build a relationship with them directly. Most importantly, the finished work was excellent, delivered on time, and inside our budget. What more is there to ask? Highly recommended.
Jack and Sue Serrino“He has completed more than 25 projects for my clients over the years, and I intend to keep sending them his way.”
Derek is far and away the best contractor I have worked with, and his ability to listen to my clients and respond to what they actually need has exceeded anything I expected. Being classically trained and professionally educated shows in the work. His grasp of both the practical and the possible means he handles small and large-scale jobs equally well, and there is genuinely nothing I would hesitate to refer to him. He has completed more than 25 projects for my clients over the years, and I intend to keep sending them his way.
Seth O’ByrneWe also build near Marsing
Building in Marsing?
Tell us about the project and we'll set up a free consultation at the property — no pressure, no obligation.