Stonetree
Covered cedar-lined entry porch of the Hillside House, Philomath, Oregon

Stonetree Builders

Custom homes and ADUs in the mid-Willamette Valley.

Stonetree Builders is a Philomath-based general contractor building new homes and accessory dwellings in Corvallis, Philomath, and nearby communities.

Hillside House · Philomath

Accessory Dwellings

Three plans, each adapted to your lot.

The Willow, Alder, and Cedar range from a studio to two bedrooms. They are early design options; final plans are developed for your site and budget.

See all three models
Concept rendering of The Alder, a modern accessory dwelling unit

The Alder1 bedroomConcept rendering

The Studio

A short project list keeps the builder close to the work.

We take on a limited number of projects each year. That keeps the builder involved in the work, the schedule, and the decisions that affect cost.

We work directly with homeowners and architects from early planning through final walkthrough, keeping decisions close to the work and communication straightforward.

Covered cedar-lined entry porch of the Hillside House with a yellow front door
Hillside House — Philomath, OregonNew home · Completed 2025

Selected Work

All projects

Have a project in mind?

Tell us about itWe reply to every inquiry, usually within two business days.