Tweto Architecture

About the Practice

How we think about residential architecture.

Tailored Spaces – Thoughtful design

We want you to love your home. The design should support how you want to live, the site, and context. We design homes to fit your life and your site. For remodels this means studying the existing home to discover what works, what doesn't, and the character of the home. For all projects, we consider your needs first, then sunlight, climate, privacy, and context to ensure the home fits its site.

A carefully developed design considers how rooms work together, how the home connects to the site, and how it becomes a cohesive whole. Materials, composition, and light shape the spaces that will become your home.

Kitchen rendering with vaulted ceiling, skylight, warm wood cabinets, and island seating, Mountaindale home design by Tweto Architecture
Oregon coast headland with meadow, sandy beach cove, and rocky shoreline — the kind of site and landscape that informs sustainable design at Tweto Architecture

High-Performance Homes – Design for sustainability

A truly sustainable home is a near-impossibility, but it remains an essential goal and informs each decision we make; we design toward sustainability.

High-performance building is the foundation of our approach. The building science behind a high-performance home produces the benefits clients feel: efficiency, comfort, durability, resilience, and healthier spaces. Green building, with its focus on materials and environmental impact, supports and shapes the choices we make. Rating systems can help set goals and measure progress when a client wants that structure. We draw from all of these, with high-performance building providing the practical framework for how a home actually works.

Design judgment matters most: knowing which strategies fit a specific house, a specific site, and a specific client, and integrating them into work that is also beautiful and buildable. We apply these principles in all our work:

  • Site — Careful siting and window placement manage solar gain, preventing overheating in summer and making the most of the sun we get in winter. The right placement can optimize opportunities for solar installations. Consideration of views, privacy, and preservation of site features means the home fits well in the site.
  • Envelope — A tight building envelope controls temperature, air, and moisture movement, making the indoor environment comfortable and quiet. Using building science to design the right envelope minimizes risks from moisture and mold, and makes an efficient home.
  • Materials — The materials in your home shouldn't make you sick. We use low-VOC materials wherever possible and favor a natural material palette. We consider longevity, embodied energy, and future reuse in the materials and assemblies we specify.
  • Systems — Electric heat pumps heat your water, heat and cool your space very efficiently. They use modest amounts of energy to move heat where it is needed. The electricity for these systems can come from clean grid power or solar panels on your roof. Ventilation, both active and passive, brings in controlled fresh air from the outside. Source control in kitchens and bathrooms keeps excess moisture and pollutants out of your home.
  • Resilience — A home that uses less energy also remains comfortable and safe during power outages, disasters, and other disruptions. Robust filtration can keep ventilation air clean during wildfire smoke events. The elements that make a house more comfortable under normal conditions make it work better during challenging ones. Materials and assemblies that can be repaired, modified, and optimized are preferred over fragile systems to make homes that are durable.

Architecture That Works – Bringing it all together

Thoughtful design and sustainability inform the project, but are not enough to make it successful. The design has to work: it has to be buildable, be within your budget, and meet local approval requirements. We have the knowledge and construction experience to understand how your project will be built. We produce detailed drawings that include the information your contractor needs to accurately bid, plan, and build your project as we designed it.

Venn diagram showing how tailored spaces, design for sustainability, and construction experience converge on architecture that works
"We have worked with Asmund for over four years now. I highly recommend him for his exceptional understanding of construction and practical building methods. He brings a tailored approach to every project, carefully listening to client needs and translating them into thoughtful, functional designs. His deep knowledge of materials, structural systems, and on-site coordination ensures that plans are both creative and buildable. Organized, responsive, and detail-oriented, he manages each phase of the process with clarity and professionalism, making the entire experience smooth and efficient."
Zach — New Roots Renovation
Asmund Tweto, founder of Tweto Architecture, Portland Oregon

About Asmund

I founded Tweto Architecture in 2017, after working first at a large Portland architecture firm and then a residential design-build company. I've built several projects myself, including an ADU and several remodels. I handle each project from the first conversation through construction support. My experience with construction and building science informs every design decision.

Before starting this practice, I spent seven years at ZGF Architects working on large-scale institutional and commercial projects where I gained valuable experience with complex projects and large firm design rigor. During this time, I realized my real passion is for crafting great spaces for living; creating new homes and improving older ones. Shifting to residential scale, I spent four years at a Portland design-build firm where I designed, estimated, and managed residential projects through construction. In 2017, after planning and designing my own ADU, I spent a summer building it myself, gaining unique experience. The combination of rigorous design training and construction experience shapes how I work: every design decision is thought through and detailed to make sure it is buildable.

I've worked in Portland and surrounding areas for over 20 years and am licensed in both Oregon and Washington.

How We Work

Detailed Experience

"Asmund has a deep understanding of the built environment and how to make small spaces really work. We appreciated his attention to detail and hands-on approach through the life of the project, including throughout construction. We strongly recommend him and would be happy to talk to anyone considering engaging his firm."
Charlie, ADU Client
"Asmund took our vision and turned our dreams into buildable plans — something that felt impossible until we sat down with him. What really set him apart was how he coached us through tough decisions without ever making us feel overwhelmed or pressured. His insight helped us stay true to our home's style at every turn."
Shoshanah, Remodel Client

Considering a project?

We usually start with a conversation to see if it's the right fit. If it seems right, we'll arrange a visit to your home or property to learn more.

Get in Touch