Janet T. Marena

For more than two decades, Janet T. Marena, Principal of JTM Interiors, has created timeless, thoughtfully crafted homes that are deeply personal as they are visually stunning. Known for her sophisticated East Coast–meets–West Coast aesthetic, Janet designs interiors with warmth, elegance, and effortless livability spaces that feel collected, authentic, and uniquely tailored to the people who call them home.

Today, her work goes beyond beautiful interiors.

Certified in Science in Design™ and Biophilic Design, Janet creates homes that calm the mind, reduce cognitive load, foster connection, and support overall wellbeing. By blending decades of design expertise with the latest research in neuroscience, biophilic design, and environmental psychology, she thoughtfully integrates natural light, materials, texture, proportion, and the restorative patterns found in nature. Every design decision is intentional, creating environments that signal safety, comfort, and beauty while enriching everyday life.

A sought-after speaker, educator, and former President of the California Peninsula Chapter of ASID, Janet is passionate about advancing the profession through evidence-based design. She regularly shares how the science behind beauty and nature can transform not only the spaces we inhabit, but also how we think, feel, and live within them.

The result is more than a beautifully designed home. It's a home that welcomes, restores, and inspires, a place where luxury is measured not only by how it looks, but by how it makes you feel.

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JTM Interiors, is a full service award-winning interior design firm specializing in biophilic and neuroaesthetic interiors. At its heart, the neuroaesthetics movement aims to bring the embodied experience into alignment with the built environment. Janet's unique aesthetic reflects her time spent on both the East and West Coasts. Her interiors feel storied, creating a warm, inviting, elegant atmosphere.

Our Services

At JTM, we offer full-service, high-end residential interior and exterior design, guiding you through every step of the process. We are involved from initial concept to final installation. Our team collaborates with you, the architect, and the general contractor to ensure the vision comes to life. By keeping our project teams small, we deliver clear communication, maximum efficiency, and a personalized experience with Janet’s hands-on, intuitive approach.

Out Team Provides:

  • Liaise with all team members, including architect, general contractor, landscape architect, and more

  • Visualize the potential of your space based on your needs

  • Space planning with the team to capture your requests

  • Design intent and detailed documentation, including 3D renderings

  • Interior and exterior design for seamless indoor-outdoor living

  • Specifications of construction materials such as plumbing and electrical fixtures, tile, stone, and other materials

  • Decorative interior design

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The Process

JTM Interiors holds the vision from conception to completion. 

Janet believes that more trust equals better outcomes. Building deep rapport is the first step in allowing Janet to present ideas that resonate. Her mindful process results in greater client satisfaction, and timeless, effective design tailored to each project. The approach is collaborative with her clients, the contractors and the architects on each project. 

Each phase becomes a building block – Janet breaks key decisions into phases to ensure that each decision the client makes informs each layer of the process. 

Following the design development phase, a project moves into execution. The JTM Interiors team is there for anything that arises, and is able to liaise as needed between:

  • Architects

  • Engineers

  • General Contractors & Builders 

  • Landscape Architects

  • City Permitting

  • Vendors

  • Masterful Design and Project Management: Why Janet is the Ultimate Remodeling Partner

    “Janet's secret weapon, that you will only discover once you embark on a project with her, is that she is actually equal parts designer and project manager. She is impeccable at keeping the decisions moving and completed in the most efficient order. She works closely and professionally with the contractor and construction crew to ensure timely arrival of materials and proper installation on-site. Once underway, you will see how many details there are of which to keep track and you will thank your lucky stars that Janet is at your side as advisor and guide!”

    -C&E

  • Trust and Expertise - How JTM Transformed Our Remodel

    “JTM has assembled a team of qualified experts to handle every aspect of our interior design and remodel. We placed our trust in Janet’s team, and they rose to the occasion! She took the guesswork out of the process and helped us navigate every phase of work.”

    -Steve

  • From Vision to Reality

    “Janet really helped us to clarify what we wanted. The team listened to us and then formed a streamlined plan to help create the reality we envisioned. Janet provided excellent resources and supported us in the decision-making process. It is clear that she takes great pride in her ability to truly understand her clients’ needs."

    -Celine

  • How Janet Simplified Our Remodel Decisions

    “I appreciated the way Janet helped us narrow down a thousand decisions to three. Our marriage would not have survived the remodel without her help.”

    -Mike