Founding Principal, Christie Tyreus

Founded by Christie Tyreus in 2011, Tyreus Architecture + Design (TAD) is an award-winning architecture firm based in Sausalito, CA. With over twenty years of experience designing luxury residential and commercial properties, TAD’s cooperative approach and sustainability-based methodologies remain at the core of their work ethos. By melding traditional techniques with modern sensibilities, TAD’s small but powerhouse team ensures a highly tailored experience for each client.

Prior to starting her own firm, Tyreus worked for several architecture firms, including the internationally-recognized STUDIOS Architecture in San Francisco and Onion Flats in Philadelphia. Tyreus holds a Master of Architecture from UCLA and a B.S. in Architecture from the University of Virginia. She taught architecture for several years at Philadelphia University, focusing on sustainable design and construction methodologies.

TAD’s work has been published in The Wall Street Journal, Dwell, AD.COM,, Architectural Record,, RUE, Sonoma Magazine, and Marin Magazine. TAD was awarded ‘Best of Marin County’ in 2023.

  • Member AIASF
  • Licensed Architect in CA, CO
  • NCARB Certification (National Council of Architects Registration Board)




Site Context: Leading with sustainability-driven methodologies, we design homes and buildings that first consider the site + surroundings. With over two decades of experience in the Bay Area, our team works collaboratively in each stage of the project to bring a client’s vision to reality.


Interior Design

Maximize Form and Funciton: Our dedicated interior design team ensures a personalized experience from planning to installation, meticulously aligning each stage with our clients’ vision, preferences, and lifestyle.


New Construction and Remodels

Rooted in History: From ground-up builds to comprehensive remodels, we blend contemporary techniques with a deep appreciation for historical context. Our approach ensures that new developments not only meet modern standards but also respect and integrate with the architectural and historical aspects of the existing structures.


Retail Concept Design

Immersive Experiences: Whether it be eateries, coffee houses, and Champaign lounges, we craft retail spaces that captivate and immerse customers, seamlessly bringing to life a cohesive and elegant store or hospitality brand.


Clients usually come to us with a mix of questions, inspiration, and a dream to create something special. Our job is to illustrate how these ideas can become reality.

Most of the architect’s work happens in the design and development stages, adding layers of detail and materiality until the project can be built by an experienced contractor.

Once construction starts, we ensure the project is built to the agreed-upon standards and facilitate efficient communication between builder and owner. Our process has been honed over our nearly two decades of experience. You can download our helpful Tyreus Introductory Package which includes a description of the Tyreus Design Process and the stages of a project from your first call to a completed home.

Every custom project is unique, but we generally suggest six months to one year for the Design, Documentation, and Permit Stages and about 12 to 16 months for construction.

It is very uncommon for our clients to know how much they want (or need) to spend to achieve their vision at the start , so we begin every project with a stage called Concept Design. This work is a fixed fee, based on project size and complexity, that is credited back to you if we continue.

The Concept Design phase covers how the project might take shape, gets you excited about it, and helps us determine the project’s scope and budget. We find this is a great way to get to know one another, and there is no obligation to proceed beyond this stage. If you do choose to continue, we agree with you on a project budget that we can then base our fees on.

For full architectural design and documentation services, we charge a percentage fee based on the cost of the project, estimated during Concept Design. Through our years in practice, we’ve found that this project cost is the clearest reflection of the work, time, and number of drawings required to deliver the high quality of work we are known for. 

The cost is not influenced by interior finishes that may be selected later on (e.g. if you choose an expensive lighting fixture during the interior design phase, the design fee does not increase).

We invoice monthly based on the progress of the stage underway.

Once construction begins, we follow the progress to support you and the construction team, billed hourly as needed.

Obtaining permit approvals can be a daunting process in many areas of California. We’ve built long-standing relationships with many of the planning departments and work collaboratively with them from the beginning of your project. Here are some of the Building Departments we work with regularly:

San Francisco, Marin County, Napa County, Sonoma County, San Mateo, St. Helena, Mill Valley, Tiburon/Belvedere, Santa Cruz, Orinda, Larkspur, San Anselmo, Kentfield, Ross, and many others.

Sustainability is integral to all of our projects. We discuss ways to reduce energy consumption, material selection, and how to address local climate challenges from the very beginning with our clients. Our office is particularly interested in wildfire resiliency and passive cooling strategies.

We have worked with and are happy to recommend a number of quality architectural builders who share our values of transparency, excellence, teamwork, respect, and a positive can-do approach. Like us, there is nothing they want more than a happy client.

Unlike large firms, our principal is involved in the design and details of each project. Christie works collaboratively with you to determine the concept and realization of the project through construction. You’ll also have a project manager contact for any questions you have on timelines, meeting notes, budget, etc. throughout the process.