October 28, 2025

Forest Park ADU

Side elevation rendering of the Forest Park ADU with a partial view of the rear deck.


Located in Portland’s Forest Park neighborhood, this ADU illustrates how site planning and architectural details allow a building to take advantage of a natural setting while seamlessly integrating into a semi-urban setting.

Maxed out ADU

ADU design projects require adherence to strict codes and guidelines, including square footage limits. Forest Park ADU showcases the maximum square footage allowance (800 sf) for an accessible dwelling unit in the Portland area. The larger lot size (more than a typical Portland lot) supported positioning a long, linear structure along the entire back edge of the property. While the front of the ADU maintains a connection to the existing home, the back takes advantage of a forest view.

Site plan of the house and new ADU. ADU is identified with the orange symbol.
The site plan illustrates how the Forest Park ADU maximizes the allowable ADU square footage.

Forest Park ADU plan highlights

The main entry thoughtfully dissects the long, linear plan with private areas to the right and communal living spaces to the left. Minimal windows on the house-facing side reinforce a sense of privacy for those living in the Forest Park ADU. Meanwhile, a 16-foot sliding door opens the backside to a serene forest view. While a compact space, the floor plan balances function and efficiency with desirable features for modern living, such as a walk-in shower.

Floor plan drawing of the ADU.
The floor plan balances private and communal spaces.

Achieving an impeccable interior

How do you make an ADU feel spacious? Vault the ceiling. Vaulting the ceilings on both the private and public sides add a sense of spaciousness that enhances the living environment. Then, a simple materials palette, including hardwood floors, custom white oak cabinetry, and quartz countertops provides a clean, modern interior. Finally, well-considered storage means everything has its place and the efficient plan remains uncluttered.

Interior 3d rendering of the living space of the Forest Park ADU showing the vaulted ceiling and the large glass doors to the deck.
A view of the vaulted ceiling in the living/dining area.

A clean, modern exterior

The ADU exterior features stained cedar siding, a standing seam metal roof, and Ipe decking to continue the simplicity of the interior while seamlessly nestling into the natural surroundings.

Front elevation rendering of the Forest Park ADU.
Minimal windows on the house-facing side reinforce a sense of privacy.

The landscaping intuitively leads to the front door, which is tucked beneath the roofline. This subtle detail provides a sense of arrival and a clear, welcoming entry point.

3d rendering of the front door of the Forest Park ADU.
The front door of the Forest Park ADU.

Life at the Forest Park ADU

In addition to extending the livable area of the ADU, the massive sliding door creates desirable indoor/outdoor living. The ample deck provides space for dining and lounging amidst the therapeutic forest setting. 

Rear elevation rendering of the Forest Park ADU showing the deck.
A view of the backside of the Forest Park ADU.

In contrast to the front elevation, the backside of the ADU provides more window openings to reinforce the relationship with the natural surroundings. A window in the desk area and one in the bedroom give each space a forest view, adding to the interior ambiance.

Rear elevation rendering of the Forest Park ADU showing the deck.
The deck provides space for lounging and dining.

The roofline creates a touch of shade on the generous deck, and movable furnishings provide flexibility to suit a variety of lifestyle needs.

Rear elevation rendering of the Forest Park ADU showing the deck.
A 16-foot sliding door accommodates indoor/outdoor living.

What is the right ADU size for you?

While the Forest Park ADU showcases the maximum square footage allowance for an ADU, every property is different. Your site circumstances provide the parameters for a unique ADU solution. We love a good ADU challenge. Let’s discuss your property and ADU needs.