ADU & Room Additions Additions Additions

in San Jose & the Bay Area

Expand your home with custom Accessory Dwelling Units (ADUs) and professional Room Additions that bring functionality, comfort, and long-term value.

With 25+ years of design-build expertise, Alon Design & Remodeling handles everything—from permits to construction—so you enjoy a smooth, stress-free experience.

Start Your Free ADU & Room Addition Estimate Today

Stress free, no surprises.

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What Are You Looking For?

Room Additions Near Me

Expand your home with seamless, value-driven extensions.

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Custom ADU Contractors

Licensed and insured experts in accessory dwelling unit projects.

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House Additions & Expansions

Tailored solutions for growing families or home offices.

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Why Homeowners Choose Alon

25+ Years of Experience

Proven record in ADU construction and home expansions.

Full Design-Build Services

Permits, planning, and construction all managed in-house.

Licensed, Bonded & Insured

Security and peace of mind.

Transparent Pricing

No hidden costs, no surprises.

Premium Quality

Durable materials and modern, functional design.

Ready to Expand? Let’s Start With Your Free Consultation

What You Gain with Alon

An additional living space designed to your lifestyle.

Increased property value and ROI.

Smart layouts that maximize comfort and usability.

A stress-free process with full permit and inspection handling.

ADU & Room Additions

San Jose

Morgan Hill

Santa Clara

Los Altos

Sunnyvale

Palo Alto

Redwood City

San Mateo

San Carlos

Cupertino

Dublin

Fremont

San Francisco

Saratoga

Los Gatos

ADU Construction & Garage Conversions

Looking for ADU builders near me? We create fully functional living units tailored to your needs:

Garage-to-ADU conversions.

Detached or attached ADUs.

Backyard cottages, in-law suites, and rental apartments.

Full amenities: kitchenettes, bathrooms, and private entries.

Complete guidance on ADU city regulations and permits.

Ready to Expand? Let’s Start With Your Free Consultation

Room Additions & Home Expansions

Searching for room addition contractors near me? We specialize in expansions that blend seamlessly:

Master bedroom additions.

Family room extensions.

Home offices and creative studios.

Second-story additions.

Perfect match with your home’s existing style.

Ready to Expand? Let’s Start With Your Free Consultation

Types of ADUs & Additions

Not every project requires a full remodel—sometimes it’s about making your existing space work better:

Backyard ADUs

Private, detached units with full amenities.

Garage Conversions

Transform unused garages into livable spaces.

Garage Conversions

Unique designs for multi-generational living or rentals.

House Additions

Add single or multi-room expansions.

Second Story Additions

Expand vertically for maximum space.

Ready to Expand? Let’s Start With Your Free Consultation

Our 4-Step Premium Process

1. Free Consultation & Vision Planning

2. Custom Design & Permit Handling

3. Construction & Project Management

4. Final Walkthrough & Warranty Coverage

Service Areas

San Jose

Morgan Hill

Santa Clara

Los Altos

Palo Alto

Redwood City

San Mateo

San Carlos

Dublin

Fremont

San Francisco

and surrounding neighborhoods.

Testimonials

Trusted by
world leading companies

1k Reviews

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Frequently Asked Questions

ADU

What’s the cost to build an ADU?

It depends on size and design. We provide transparent estimates based on your specific project.

Most ADUs take 10–16 weeks, depending on permits and construction complexity.

Yes – we manage all city requirements and inspections across the Bay Area.

Yes, many clients generate rental income from their ADUs.

Room Additions

How long does a room addition take?

Typically 8–12 weeks, depending on the project size.

Absolutely – our designers ensure seamless integration with your existing architecture.

Master bedrooms, family rooms, home offices, second stories, and more.

Yes – properly designed additions increase livable space and resale value.

Expand Your Home – Schedule Your Free Consultation Today