Building Tiny Homes, Modular Homes & ADUs in Olympia, WA
Pacific Mountain Dwellings is a general contractor serving Olympia and the surrounding Thurston County area, and we're just a short drive up I-5 from our home base in Winlock. Whether you're adding a backyard cottage in South Capitol, planning a modular home on the Eastside, or setting a tiny home near West Bay, we handle the whole process — permits, foundation, and delivery. Call us at (360) 318-3984 to talk through what you have in mind.
What makes building in Olympia different
Olympia sits at the southern tip of Puget Sound, and that location shapes everything about how a home needs to be built here. The marine climate brings long, wet winters with steady rain from October well into spring, so proper drainage, moisture detailing, and a foundation that sits right on the site matter more than they might inland. Homes here take on a lot of water over the years, and we plan for it from day one.
The city's older neighborhoods — South Capitol, Bigelow, and Governor Stevens among them — hold a lot of early- and mid-century houses on established, sometimes tight, tree-lined lots. Adding an ADU behind one of these homes means working carefully around mature landscaping, existing utilities, and setbacks that leave little room to spare. Newer areas out toward Briarwood, Castlewood, and the 98512 and 98513 ZIPs tend to offer more open ground, which changes what's realistic for a modular home or a slab foundation.
Terrain is another real factor. West Bay and the areas sloping down toward Capitol Lake and Budd Inlet can involve grade, fill, and soil that need attention before anything gets set. And because Olympia is the state capital, permitting through the City of Olympia or Thurston County is something we take seriously — we manage the applications, inspections, and code requirements so you're not left guessing. If your property falls under an HOA, we'll work within those rules too; we'd rather confirm the details up front than assume.
Services we offer in Olympia
- ADUs (Accessory Dwelling Units): Backyard cottages and in-law units built to add living space, rental income, or room for family — designed to fit the lot sizes common in neighborhoods like Bigelow Highlands, Carlyon-North, and Northeast Olympia.
- Modular Buildings: Factory-built homes delivered and set on your Olympia-area property, a strong option for the more open lots on the west and south sides of town.
- Tiny Homes: Efficient, well-built small homes permitted and placed to code, ideal for infill lots or as a compact primary residence.
- Foundations: Slab, stem-wall, and pier foundations engineered for Olympia's wet ground and varied terrain, giving whatever we build a solid, lasting base.
Every project includes the permitting and delivery work, so you get a home that's ready to live in — not a pile of parts and paperwork.
Local, reliable, and nearby
We know Olympia isn't just a spot on the map — it's the Farmers Market on a Saturday morning, the Capitol Campus dome you can see from half the city, and the families heading to the Hands On Children's Museum or picking up groceries near Capital Mall. When you call us, you're talking to a contractor who understands what it means to build near Providence St. Peter Hospital, work around the busy corridors off Capitol Way, and account for the drive times and traffic that come with a growing city.
Because we're based in Winlock, we serve the whole Olympia area — 98501, 98502, 98504, 98505, 98506, 98512, 98513, and 98516 — without being so far away that a site visit is a hassle. We show up, we communicate, and we treat your property the way we'd want ours treated. From the first conversation about your ADU or tiny home to the day the foundation cures and the home is set, you'll have one team that stands behind the work.
If you're thinking about a tiny home, modular home, or ADU anywhere in the Olympia area, we'd love to hear about it. Call Pacific Mountain Dwellings at (360) 318-3984 and let's figure out what's possible on your lot.
