Marin County
Interior Design in Mill Valley, CA
Organic, nature-rooted luxury beneath Mount Tamalpais.
Mill Valley nestles into the redwoods at the foot of Mount Tamalpais, blending a creative, laid-back spirit with genuine luxury. Homes here climb wooded hillsides, and interiors are designed to feel organic, warm, and deeply connected to the landscape.
Our Mill Valley work leans into natural materials and an organic-modern sensibility, framing the trees and light while keeping spaces relaxed and livable. From hillside contemporaries to updated cottages, we deliver the unpretentious, nature-rooted luxury the town is known for.
Selected work across the Bay Area
What we do in Mill Valley
- Interior design in Mill ValleyFull-service interior design, from concept and space planning to materials, lighting, and the finishing details that pull a home together.
- Whole-house remodels in Mill ValleyTop-to-bottom home remodels that rework the floor plan, modernize every system, and bring a single, considered design language to the whole house.
- Kitchen & bath remodels in Mill ValleyKitchen and bathroom renovations built around how you actually cook, gather, and unwind, with durable, beautiful materials throughout.
- Home additions in Mill ValleyAdditions that add the space you need, a primary suite, a great room, a second story, while keeping the home cohesive inside and out.
- ADU design & build in Mill ValleyAccessory dwelling units for guests, family, or rental income, designed to feel intentional rather than tacked on.
- Custom homes in Mill ValleyGround-up custom homes designed and delivered as a single, coordinated process from first sketch to final walkthrough.
- Outdoor & exterior transformations in Mill ValleyFacades, outdoor living spaces, and landscapes reworked so the outside of the home is as considered as the inside.
Neighborhoods we serve in Mill Valley
Hillside contemporary homes and wooded cottages shape Mill Valley.
- Old Mill
- Cascade Canyon
- Homestead Valley
- Tam Valley
- Sycamore Park
Planning a project in Mill Valley?
Tell us about your home, your goals, and your timeline. We will get back to you to talk through how New Key Design & Co can help.
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