La Center ADU Builder

Every ADU starts with what one specific lot allows

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. That's true across the metro, and it's true in La Center — with the important caveat that La Center sits north of the river in Clark County, Washington, where the rules are the state's and the county's, not Portland's or Oregon's. JDI Construction is a family-owned, Vancouver-based design-build remodeler, and we treat an accessory dwelling unit as what it is: a second, independent home on your lot, where the zoning and the utilities decide what's possible before the design does. So we confirm what your specific La Center property allows first, then design to it. La Center is a small town to the north, near the East Fork Lewis River, with larger lots and a good deal of newer construction — the kind of parcels where a detached unit often fits naturally.

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. Here's the range of ADUs we build, what decides what's possible on your lot, 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. On La Center's larger lots, a standalone unit is frequently the most natural choice:

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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 make or break an ADU come well before design. The first is feasibility. ADU rules — the categories of size, height, placement, parking, and fees — are set by the jurisdiction, and La Center is governed by Washington and Clark County, which is a different rulebook entirely from Portland's across the river. It's worth stating plainly: being ADU-friendly in Oregon has no bearing on your La Center lot, so we confirm what your specific parcel permits before drawing anything. The second decision is type and use — a detached cottage, an attached addition, a garage conversion, and an interior unit each carry their own site demands, and whether you're building for rental income, family, or a home office shapes the layout. The third is budgeting for the parts you can't see: the water, sewer, and power connections and the system development charges that come with a new dwelling. On outlying or newer-build lots it's also worth confirming early whether the property is on public utilities or a private well and septic system, since that shapes both the plan and the budget. We walk through all of it up front so there are no surprises after design.

What La Center homeowners build ADUs for

Most ADUs we're asked about in La Center fall into a few uses: a rental for income, a private space for aging parents or adult children who want their own room while staying close, or a quiet office or studio separate from the main house. On the larger lots common here, a detached unit with its own footprint often serves these best. Each use points the design a different direction — a rental leans toward durability and a private entrance, a multigenerational unit toward single-level, accessible living.

Because La Center is in Clark County, the applicable rules are Washington's and the county's, which differ from Portland's — another reason we start by confirming what your parcel allows rather than assuming. Whatever the use, we design a compact footprint to live larger than its square footage, with the light, storage, and ceiling height that keep a small home from feeling small.

What does an ADU cost in La Center?

ADU cost is driven first by type: a garage or interior conversion that reuses an existing structure generally costs less than a detached cottage built from the ground up. After that come size, finish level, and — the part homeowners often underestimate — the site and utility work. Running water, sewer, and power to a new dwelling, handling grading and access, and covering connection fees can be a meaningful share of the budget, and on a well-and-septic property those costs look different again. That's 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 figure.

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 remodel because it involves both zoning and utility review, and on a private-utility property that review can add site evaluation. We build that time into the plan rather than promising a quick turnaround. Once permits are in hand, construction depends on type — a conversion is 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 La Center choose JDI

An ADU rewards a builder who understands the rules as well as the construction, because the project can stall at the permit counter long before the first wall goes up — and a small-town or outlying lot can raise utility questions that are easy to miss early. 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. Being a short drive south in Vancouver, 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 La Center and the greater Portland–Vancouver metro since 2007.