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Room Addition Contractor San Jose CA

Top Room Addition Contractor

Sometimes, your house feels just a little too small. Maybe your family is growing, you’re working from home, or you simply want more comfort. Instead of moving, there’s a better solution-expand your home right where you are.

With the right team, a room addition in San Jose can transform your existing home into a spacious, functional, and inviting place.


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Home Remodeling & Room Addition Santa Clara

This project in Santa Clara showcases Quartz Construction’s expertise in seamlessly integrating extensive home renovations with strategic room additions to enhance both functionality and aesthetic appeal.

Home remodeling San Jose Bay Area - Quartz Construction & Remodeling

Bathroom Addition and Covered Patio Danville

At Quartz Construction, we specialize in transforming homes with bespoke bathroom additions and covered patios that elevate lifestyle and property value. Our latest project in Danville showcases our commitment to excellence 

Bathroom remodeling project San Jose CA - Quartz Construction & Remodeling

Outdoor Deck Danville

Elevate your outdoor living experience with Quartz Construction’s bespoke deck solutions in Danville. Specializing in custom deck designs, our project transforms your backyard into a stunning, functional retreat ideal for relaxation, entertainment, and enjoyment of Danville’s 

Deck construction San Jose CA - Quartz Construction & Remodeling

Types of Room Additions We Offer

At QuartzConstructionRemodeling, we specialize in designing and building additions that seamlessly blend with your property’s style. Whether you need an extra room for your family, a home office, or even an in-law suite, our goal is to create the perfect balance between practicality and design.

How to Plan a Home Addition San Jose

Planning a home addition requires careful thought. First, consider why you need extra living space. Do you want to add a second-story addition, extend your family room, or build an accessory dwelling unit (ADU)? Each option comes with its own set of requirements.

Next, you’ll need to evaluate your property and local zoning rules. Obtaining permits in San Jose is part of the process, and compliance with local building codes ensures the addition meets all safety standards. A home addition contractor can guide you through these steps, making the planning stage much less overwhelming.

At QuartzConstructionRemodeling, we provide a free in-home consultation where we discuss your needs, the type of home you have, and the best custom solutions for your space. Our project manager will answer all your questions and help outline a clear plan.

THE STEPS TO BUILD HOME ADDITION
SAN JOSE

 

 

The building process for a home addition project involves several key stages:

  1. Consultation & Design – We discuss your goals, type of home, and budget.

  2. Obtaining Permits – We handle the paperwork and make sure everything complies with local zoning regulations.

  3. Construction Services – Our team and trusted vendors begin the room addition construction, ensuring every detail is carefully executed.

  4. Final Inspection – Once completed, your new space is inspected to confirm compliance with building codes.

Throughout your home, we make sure every addition blends seamlessly with your existing design, bringing your vision to life with custom solutions.

Steps to Build Home Addition San Jose

Benefits of Room Addition in San Jose

Choosing to expand your home has many advantages:

  • Extra Living Space: Whether it’s for a home office, a family room, or a fully equipped in-law suite, you gain the comfort you need without leaving your neighborhood.

  • Property Value: Well-designed home additions in San Jose often increase the value of your property.

  • Customization: You’re not limited by the layout of your existing home-you can design a space that truly matches your lifestyle.

  • Potential Rental Income: Accessory dwelling units (ADUs) or in-law suites can provide an additional source of income if rented out.

With the right contractor, the result is a livable, functional space that feels like it was always part of your home.

How to Plan a Home Addition San Jose

Planning a home addition requires careful thought. First, consider why you need extra living space. Do you want to add a second-story addition, extend your family room, or build an accessory dwelling unit (ADU)? Each option comes with its own set of requirements.

Next, you’ll need to evaluate your property and local zoning rules. Obtaining permits in San Jose is part of the process, and compliance with local building codes ensures the addition meets all safety standards. A home addition contractor can guide you through these steps, making the planning stage much less overwhelming.

At QuartzConstructionRemodeling, we provide a free in-home consultation where we discuss your needs, the type of home you have, and the best custom solutions for your space. Our project manager will answer all your questions and help outline a clear plan.

Master Bedroom

Creating a spacious master suite allows you to enjoy privacy and comfort. You can include a walk-in closet, a custom bathroom, and even a seating area. A master bedroom addition brings a touch of luxury and significantly boosts the value to your home.

Home remodeling contractor San Jose CA - Quartz Construction & Remodeling

Family Room

A family room expansion provides a warm, open living area where everyone can gather. This kind of home improvement is perfect for entertaining or simply relaxing. It also adds to the sense of openness throughout your home.

Home remodeling contractor San Jose CA - Quartz Construction & Remodeling

Other Types

Other popular additions in San Jose include sunrooms, home offices, or in-law suites. Some homeowners even choose a second-story addition when they want to double their living area without expanding into the yard. Each option offers unique benefits and can be tailored to the specific needs of your household.

How to Find the Best Room Addition Contractor San Jose?

Finding the right addition contractor makes all the difference. Look for professionals with experience in home renovation, a solid portfolio of custom home additions, and strong knowledge of local zoning. A reliable contractor will guide you through obtaining permits, provide clear cost estimates, and manage the building process from start to finish.

It’s also important to choose someone who communicates clearly and offers room addition services tailored to your type of home. Reading reviews and asking for references can help you find a trustworthy partner for your project.

What Clients Are Saying About Us

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Perry Finch profile picture
Perry Finch
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We’re so happy with the work Hila and her team did on our home addition. The new space flows beautifully with the existing structure, and the quality is clear in every finish. Finished on schedule and stress-free.
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Joy Ruther profile picture
Joy Ruther
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Working with Ohad on our full home remodel was an incredible experience. He helped us through every decision and made sure everything turned out exactly how we envisioned. The team was easy to communicate with and super detail-focused. We still can’t believe how beautiful our home looks!
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Ajay Mukhopadhyay profile picture
Ajay Mukhopadhyay
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We recently worked with Quartz Construction (Owner: Ohad) for a construction project to remodel our Bathroom and we couldn’t be more pleased with the results. From start to finish, their team demonstrated professionalism, and exceptional craftsmanship. They maintained clear communication throughout the project, kept us informed of progress and any potential changes, and delivered everything on time and within budget. Their quality of work is outstanding — every detail was handled with care and precision. What stood out most was their commitment to customer satisfaction. They were responsive to our questions, respectful of our space, and ensured that the final outcome matched our vision perfectly. If you're looking for a reliable, skilled, and trustworthy construction contractor, I wholeheartedly recommend Quartz Construction ( Ohad and his team) .They exceeded our expectations in every way. Ajay
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debbie curley profile picture
debbie curley
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I had a fantastic experience working with Quartz Construction And Remodeling. Ohad Maloul the owner was professional communicative and a pleasure to work with from start to finish. His team repaired and painted my backyard pergola and the quality of their work was truly excellent. They were always on time, friendly and responsive to any questions I had throughout the process. I appreciated the clear communication and attention to detail. I’m excited to work with Ohad and his team on future projects and highly recommend them to anyone looking for reliable, high-quality construction or remodeling services.
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Harry Lewis profile picture
Harry Lewis
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Hila managed our balcony addition project with care and precision. The design complements our home perfectly, and the build quality is outstanding. She communicated every step and made the whole process easy. We’re thrilled with the result!
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Qi Lei profile picture
Qi Lei
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I had the chance to work with Ohad and his construction team on a recent home project, and I was really impressed. Ohad is professional, easy to communicate with, and genuinely cares about the quality of the work. The crew showed up on time, kept the work area clean, and finished the job on schedule. It’s hard to find contractors who are reliable and transparent these days, but Ohad delivered on everything he promised. Would definitely recommend if you’re looking for someone who takes pride in their work and keeps things straightforward.
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Boris Tyron profile picture
Boris Tyron
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We’re so happy with the work Quartz Construction did on our backyard. Ohad’s team designed and built a gorgeous deck and patio that turned the area into a dream space. The quality and detail are fantastic. Highly recommend!
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Gloria Collin profile picture
Gloria Collin
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Quartz Construction built the most beautiful pergola in our backyard, thanks to Ohad. He was easy to work with, listened to our needs, and delivered a structure that’s both stylish and durable. We now have a shaded space where we can relax and entertain guests.
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Dustin Walsh profile picture
Dustin Walsh
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They built a beautiful, durable pergola that fits our outdoor space perfectly. Hila paid close attention to both style and quality. We now have the perfect spot for lounging, gatherings, and enjoying every season.
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Paul Wilins profile picture
Paul Wilins
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We feel incredibly lucky to have worked with Hila. She made the ADU process simple and stress-free, handling everything with care and professionalism. The final space is perfect—efficient, elegant, and exactly what we hoped for. Big thanks to her and the whole crew!
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Why Choose QuartzConstruction for Your Home Addition Project?

At QuartzConstructionRemodeling, we understand that every home addition project is unique. As a general contractor with years of experience in additions in San Jose, we’ve built everything from in-law suites to second-story additions.

We take the time to listen to your needs and provide custom design solutions that seamlessly blend with your existing home. From consultation to final inspection, our goal is to make the experience as stress-free as possible. We also work with trusted vendors and professional home builders to ensure top-quality results.

Our team specializes in bringing your vision to life. Whether you need a new room for your growing family, want to expand your home office, or dream of creating an accessory dwelling unit, we’ll handle every detail of the process of the home remodeling and home expansion.

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Trusted by San Jose Homeowners

★★★★★

4.9/5.0 • 65+ Google Reviews

★★★★★

“Amazing kitchen remodel — on time, on budget. Highly recommend Quartz Construction!”

— Maria S., San Jose

★★★★★

“Professional, communicative, and the bathroom renovation exceeded expectations.”

— David L., Santa Clara

★★★★★

“Built our ADU from scratch — permits, foundation, everything handled seamlessly.”

— Jennifer T., Sunnyvale

★ View All 65+ Reviews on Google

Get Your Free Estimate

Licensed • CSLB#1003436 • Serving San Jose & Bay Area

    Or call us directly: (650) 749-7436

    Quartz is a construction and remodeling company serving San Jose and the nearby areas. Our firm offers a wide range of services, including full-home renovations, kitchen remodeling, bathroom renovations, window replacement, deck building and repair, patio construction, and more.


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    Location

    Address: 1777 Hamilton Avenue #1080, San Jose, 95125 California, USA.

    Mon-Sat: 08:00 – 19:00

    © 2025 Quartz Construction and Remodeling, San Jose, California.

    Frequently Asked Questions — Remodeling in San Jose

    How much does home remodeling cost in San Jose?
    Home remodeling in San Jose typically costs $15,000–$200,000+ depending on scope. Kitchen remodels range $25,000–$80,000, bathroom remodels $15,000–$50,000, and full home renovations $100,000–$300,000. Call (650) 749-7436 for a free San Jose estimate.
    What is the best remodeling contractor in San Jose?
    Quartz Construction & Remodeling is a top-rated remodeling contractor in San Jose with a 4.9★ Google rating from 65+ reviews. We are BBB A+ rated, licensed (CSLB #1003436), and have served San Jose homeowners since 2015. We specialize in kitchen, bathroom, ADU, deck, and full home renovation.
    Do I need a permit for remodeling in San Jose, CA?
    Yes, most structural, electrical, or plumbing work in San Jose requires permits from the local building department. Quartz Construction & Remodeling handles all permit applications and inspections as part of every project. We ensure 100% code compliance.
    How long does a remodel take in San Jose?
    Remodel timelines in San Jose vary: bathroom remodels take 2-4 weeks, kitchen remodels 4-8 weeks, room additions 8-12 weeks, and full home renovations 3-6 months. We provide a detailed timeline and milestone schedule during your free consultation.
    🔑 CSLB License: #1003436 ↗ Verify|🏆 BBB: A+ Accredited ↗|4.9/565+ Google Reviews ↗|📞 (650) 749-7436
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    Frequently Asked Questions

    Have more questions? Get a free estimate today.

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