At GMJ Construction, being the No.1 Eichler Los Altos Hills construction company with over 15 years of experience, we offer an array of construction and remodeling solutions throughout the Bay Area. Specializing in the meticulous remodeling of Eichler Homes, we blend modern techniques with traditional craftsmanship to enhance these architectural gems. Our diverse services span both residential and commercial projects, guaranteeing high-quality outcomes tailored to each client’s vision.

Trust GMJ Construction Inc. for skilled, reliable, and top-tier construction expertise that transforms spaces into aesthetically pleasing and functional environments. Choose us for unparalleled commitment and exceptional results in every project.

Eichler Additions Tailored to Your Vision

In Los Altos Hills, our custom Eichler home additions are designed to honor mid-century modern roots and integrate with the rolling hills.  Eichler homes, built between the 1950s and 1970s, are known for signature features like post-and-beam construction, low-pitched roofs, and floor-to-ceiling glass walls that blur indoor/outdoor boundaries .  Our expert team specializes in preserving these hallmarks while expanding your living space – whether adding a new wing or enlarging an existing area – so your room addition blends seamlessly with the original Eichler design. We handle everything from concept to completion, coordinating with local codes and using eco-conscious materials.  Every project starts with thoughtful planning and design so we can achieve that open, light-filled feeling that Eichlers are famous for .

• Open Floor Plans & Glass Walls: We maintain the airy, connected layout and extensive glass that Eichler fans love .

• Natural Materials: Wood paneling and simple finishes ensure new additions fit the Eichler aesthetic.

• Specialist Expertise: Working with Eichler specialists is critical. Our team understands the nuances of post-and-beam framing and radiant-floor systems.

Custom Room Additions & ADUs

When you need more space, GMJ offers custom room addition and ADU services to maximize your Eichler home’s potential.  A well-designed addition can add bedrooms, expand a kitchen or living area, or create a new master suite – all while respecting the original architecture. Likewise, an Accessory Dwelling Unit (ADU) adds a self-contained guest cottage or rental unit on your property. In California, ADUs deliver real benefits: they provide extra income, housing for family or caretakers, and add value to your property.  In fact, Los Altos notes that ADUs create “more affordable housing” and rental opportunities.  Local rules are ADU-friendly too – Los Altos Hills allows one ADU and one junior ADU per lot and processes permits administratively, so we can fast-track your project.

Whether converting a garage or building anew, our ADU experts design units that complement Eichler style.  We guide you through California’s generous ADU regulations, helping you benefit from higher density and rental income.  Typical ADU styles we build include:

• Detached Backyard Cottages: A separate structure in your yard, sized up to 800–1200 sq ft depending on setbacks.

• Attached Additions: Expanding the original home’s frame for extra living space without a separate entrance.

• Garage Conversions: Transforming existing garages into modern suites – a cost-effective ADU option (see our garage-to-adu conversion guide).

We integrate the same Eichler elements – clerestory windows, natural woods, and clean lines – ensuring your ADU feels cohesive. The result is extra space for guests or a rental, built efficiently under California’s streamlined ministerial ADU approval process.

Comprehensive Planning & Design Process

From the initial sketch to the final walkthrough, GMJ Construction makes complex additions and ADUs simple.  Our full-service approach covers:

• Design Consultation: We collaborate on custom layouts that preserve Eichler charm.  Our in-house planners create visuals and 3D plans aligned with your vision and budget.

• Permitting & Approvals: Thanks to new state laws, Los Altos Hills treats ADUs and home additions as ministerial projects, meaning only standard building permits are required. We submit plans for you and navigate any town requirements (Los Altos Hills adopted updated ADU ordinances consistent with state law).

• Construction & Finishing: Our certified team constructs additions to strict Eichler standards, using green building practices when possible.  We coordinate all trades – framing, roofing, siding, flooring – and manage the project timeline.

This streamlined process means you avoid costly delays. Throughout, we anchor your project with relevant information (see our FAQ page) and stay in communication, so you know what to expect at each step.  We even collaborate with local Eichler heritage enthusiasts and architects to ensure authenticity (learn more about Eichler benefits on our blog ).

Why Choose GMJ Construction

With over 15 years serving Bay Area homeowners, GMJ Construction is the trusted partner for Eichler remodels and ADUs.  We are licensed (#996536), fully insured, and deeply familiar with the unique needs of mid-century homes.  When you work with us, you get:

• Eichler Expertise: As Eichler home specialists, we preserve original design while modernizing functionality.

• Local Focus: We know Los Altos Hills and the broader Bay Area well – from service areas to neighborhood styles.  (Check our Los Altos Eichler Remodels service page.)

• Transparent Process: Flat fees and detailed contracts protect your budget.  Read our terms of service and privacy policy on the GMJ Construction site.

• Quality Guarantee: We use top materials for siding, roofing, and interiors (ask about our siding installation and paint options).

• Happy Clients: Browse our project gallery to see successful Eichler additions, and read testimonials from satisfied homeowners.

Ready to get started? Contact us today for a free consultation on your Custom Eichler Addition or ADU in Los Altos Hills. We’re here to answer any questions (visit our Contact Us page) and help you make the most of your Eichler legacy.

Learn More & FAQs

For detailed guidance, check out our resources:

• Eichler Home Resources: Read our articles on renovating Eichler homes and Eichler renovation mistakes to learn how to modernize while preserving character.

• ADU Guides: Explore the benefits and requirements of ADUs on California’s centralized ADU portal and see our Garage-to-ADU conversion tips.

• Bay Area Remodeling FAQs: Visit our FAQs page for answers on permits, timelines, and more.

Whether expanding your living room or adding a backyard cottage, GMJ Construction delivers custom Eichler additions and ADUs that respect history and suit modern living . Let us help you create your perfect mid-century modern space in Los Altos Hills.