Troutdale ADU Builder

Your Troutdale ADU begins with a feasibility check, not a floor plan

Portland is one of the most ADU-friendly cities in the country, yet every lot is different, so a feasibility check comes before a floor plan. JDI Construction is a family-owned, Vancouver-based design-build remodeler, and we believe an accessory dwelling unit — a second, independent home on your property — should be designed around what your parcel actually allows, not around a plan you fall for first. In Troutdale, at the eastern edge of Multnomah County and the gateway to the Columbia River Gorge, lots vary a great deal from the historic downtown to the newer neighborhoods near the Sandy River, and that variety is exactly why we start on your specific site.

Our designers and trades work as one team, so the unit you approve is grounded in what the site and the code actually permit — we don't hand a hopeful floor plan to a separate crew and find out later it won't pass. Below is the range of ADUs we build, what decides what's possible in Troutdale, and what to expect on cost and timeline.

Types of ADUs we build

"ADU" covers several very different builds, and the right one depends on your lot, your budget, and how you'll use it:

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   Detached (DADU)A standalone backyard cottage — the most flexible, and the most site-dependent.
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   Attached ADUAn addition with its own entrance, kitchen, and bath, tied to the main house.
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   Garage conversionTurning an existing garage into a living unit, often the most cost-effective route.
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   Basement / interiorConverting lower-level or interior space into a self-contained unit.

A few decisions worth making early

The choices that shape an ADU come well before design. The first is feasibility: Oregon has opened the door to ADUs statewide, but the specifics — size limits, setbacks, height, parking, and fees — are set locally and vary from one city to the next, so what the City of Troutdale allows on your lot is a question we confirm before drawing anything. The second is type and use: a garage conversion, a basement unit, an attached addition, and a detached cottage carry very different costs and site demands, and whether you're building for rental income, family, or a workspace shapes the layout. The third is budgeting for the parts you can't see — the sewer, water, and power connections and the system development charges that come with adding a dwelling. On the larger lots common in parts of Troutdale a detached cottage may be well within reach, but the utility runs still deserve a real number early. We walk through all of it up front so there are no surprises after design.

What Troutdale homeowners build ADUs for

Most Troutdale homeowners who ask us about an ADU have one of a few goals in mind: a rental for steady income, a private space for aging parents or adult children close to the main house, or a quiet studio or home office set apart from the daily bustle. Each goal points the design a slightly different direction — a rental leans toward durability and a separate entrance, while a multigenerational unit leans toward single-level, step-free living.

With Troutdale's mix of established downtown lots and newer subdivisions, and its proximity to the Gorge and the Sandy River, siting a compact unit well matters as much as sizing it. Whatever the use, we design the footprint to live larger than its square footage, with the natural light, smart storage, and ceiling height that keep a small home from ever feeling cramped.

What does an ADU cost in Troutdale?

ADU cost is driven first by type: a garage or basement conversion that reuses an existing structure generally costs less than a detached cottage built from the ground up. After that it's size, finish level, and — the part homeowners most often underestimate — the site and utility work. Running sewer, water, and power to a new dwelling, handling grading and access, and covering connection charges can be a meaningful share of the budget, which is exactly why we scope them early. With design and trades both in-house, we give you an itemized estimate once we know what your lot allows and which type fits, so the number reflects your project rather than a generic per-square-foot guess.

How long does an ADU take to build?

An ADU runs on three clocks: feasibility and design, permitting, and construction. Permitting for a second dwelling can take longer than a straightforward remodel because it involves zoning and utility review, so we build that time into the plan rather than promising a quick turnaround. Once permits are issued, construction timelines depend on the type — a conversion moves faster than a ground-up cottage. We give you a realistic schedule after the feasibility check, handle the permitting, and keep you updated through our client portal as the unit comes together.

Why homeowners in Troutdale choose JDI

An ADU rewards a builder who understands the rules as well as the framing, because a project like this can stall at the permit counter long before the first wall goes up. As a single accountable design-build team, we handle the feasibility, the design, the utility connections, and the build under one roof, so nothing gets lost between a zoning question and the crew on site. We manage the permitting, keep you informed through our client portal, and stand behind the work with a five-year workmanship warranty. Troutdale sits a short drive from our Portland–Vancouver metro base, so we're close enough to stay responsive throughout a project this involved.

JDI Construction — "Built by family. Trusted by neighbors." Design-build remodeling and ADU construction based in downtown Vancouver, WA, serving Troutdale and the greater Portland–Vancouver metro since 2007.