Eunoia Builders Inc.
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    • Home
    • Portfolio
    • Our Story
    • Get in Touch
    • Service Areas
      • Sunnyvale CA
      • Palo Alto, CA
      • Los Gatos CA
      • Los Altos CA
      • Cupertino CA
Eunoia Builders Inc.
  • Home
  • Portfolio
  • Our Story
  • Get in Touch
  • Service Areas
    • Sunnyvale CA
    • Palo Alto, CA
    • Los Gatos CA
    • Los Altos CA
    • Cupertino CA

Home Addition Construction in Los Altos, CA

Running out of space in your Los Altos home? Whether you're expanding for a growing family, building a private office, or adding a guest suite, our home addition services are designed to bring your vision to life without the hassle of moving. We specialize in seamless, code-compliant expansions that preserve your home’s architectural character while delivering the extra space you need.


Our experienced team serves homeowners across Los Altos with professionalism, transparency, and a commitment to quality that shows in every detail. From the initial planning to the final inspection, we guide you through a smooth and efficient construction process designed to minimize disruption and maximize value.

Custom Additions Built to Fit Your Life

Every home is different and so is every family. That’s why we offer fully customized additional solutions that match your lifestyle, layout, and long-term goals.

Room Additions

Garage Conversions

Garage Conversions

Need an extra bedroom? A quiet workspace? Or maybe a larger living room? Our room additions are built to integrate seamlessly with your existing structure, matching finishes and architectural details to make your new space feel like it’s always been part of the home.

Garage Conversions

Garage Conversions

Garage Conversions

Unused garages can be transformed into high-value living space. We convert garages into studios, in-law suites, rental units, or hobby spaces complete with electrical, plumbing, and full insulation. All conversions comply with Los Altos zoning laws and Title 24 energy standards.

Second Story Additions

Second Story Additions

Second Story Additions

For properties with limited yard space, going vertical can be the ideal solution. We handle all aspects of second-story additions, including structural analysis, foundation reinforcement, and roofline matching. This is a great way to add bedrooms, bathrooms, or an entirely new upstairs living space without expanding your footprint.

ADUs and In-Law Units

Second Story Additions

Second Story Additions

With increasing demand for flexible living options in Los Altos, Accessory Dwelling Units (ADUs) are a smart investment. We build detached or attached ADUs that serve as guest homes, rental units, or multigenerational living spaces. We handle everything from design and permitting to final finishes.

Our Home Addition Process

We know home expansion is a major investment. Our goal is to make the process simple, predictable, and stress-free.


1. Free Consultation

We begin by listening on-site or virtually to understand your goals, evaluate your space, and provide guidance on layout options, costs, and timelines.


2. Design & Planning

Our team works with you to create architectural drawings that reflect your needs while blending seamlessly with your home’s current design. We consider light, layout, structural integrity, and aesthetics in every plan.


3. Permitting & Engineering

Los Altos has strict permitting requirements, and we know how to navigate them. We coordinate with city planning, zoning, and engineering departments to secure all necessary approvals before construction begins.


4. Construction & Management

We assign a dedicated project manager to keep your project on time and on budget. Our crews are clean, professional, and committed to quality from framing to finishes.


5. Final Walkthrough & Warranty

Before we wrap up, we conduct a detailed walkthrough to ensure everything is completed to your satisfaction. We also stand behind our work with a labor warranty for long-term peace of mind.

Why Los Altos Homeowners Choose Us

Homeowners in Los Altos expect precision, professionalism, and lasting value and that’s exactly what we deliver. Here’s why local families trust us with their most important projects:


✅ Experienced with Los Altos zoning, permitting, and architectural styles

✅ In-house design and structural engineering team

✅ Transparent pricing and honest communication

✅ Fully licensed, insured, and code-compliant

✅ Detailed craftsmanship and premium materials

✅ Proven track record of satisfied clients

We don’t just build additions, we create spaces that enhance your lifestyle and add long-term value to your home.

Proudly Serving All of Los Altos

From North Los Altos to Loyola Corners and the Country Club neighborhood, we understand the character, style, and standards of homes throughout the area. Our additions are designed to match your home's elegance and withstand the test of time.

Let’s Build Your Ideal Space Right Here in Los Altos

Ready to expand your home without leaving the neighborhood you love? Whether you’re planning a simple room addition or a full second story, we’re here to help make it happen.


Contact us today for a free consultation and take the first step toward transforming your Los Altos home into the space you’ve always wanted.

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