Home Additions in Fontana, CA

Castillos Construction Services builds home additions for homeowners across Fontana and the surrounding Inland Empire.

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A newly completed single-story room addition attached to a stucco home in Fontana, California, showing a framed exterior wall with matching roofline and finished siding. The addition extends the rear of the house and connects seamlessly to the existing structure.

Expert Home Additions in Fontana, CA

When your home runs out of room, a home addition gives you the space you need without the cost of moving. Castillos Construction Services handles home additions for homeowners in Fontana, Riverside, Rancho Cucamonga, Upland, Highland, Monrovia, and Jurupa. We build room additions, second-story expansions, primary suite additions, bump-outs, and garage conversions. Fontana's housing stock ranges from older ranch-style homes to newer tract builds, and lot sizes vary across the city. That variety means every addition starts with a close look at your existing structure, your lot, and how the new space connects to what is already there. Our background spans decades of hands-on construction work, and since opening Castillos Construction Services in 2019 we have focused on residential builds that hold up and look like they belong. If your family has outgrown your floor plan, call us to talk through your options.

What's included

  • Added square footage increases your home's resale value in a competitive Inland Empire market
  • A purpose-built room addition functions better than a repurposed space and holds its value at resale
  • Expanding your home avoids the expense and disruption of buying and moving to a larger property
  • A well-planned addition integrates with your home's existing roofline, foundation, and mechanical systems
  • Growing or multigenerational families gain private, dedicated space without leaving their neighborhood
  • A second-story or bump-out addition uses your existing lot without sacrificing yard space unnecessarily
Licensed General Contractor
New Home Construction
ADU Specialist
Renovation & Addition Expert

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Home Additions FAQ

Common questions about home additions in Fontana, CA.

Yes, we build home additions throughout Fontana and the surrounding areas. We assess your existing structure and lot before any work begins to make sure the addition fits your property correctly.

We build room additions, second-story additions, primary suite additions, bump-outs, and garage conversions. The right type depends on your lot, your home's current layout, and how you plan to use the new space.

No, you can contact us directly to discuss your project in Riverside. We work through the planning details with you before any construction begins.

Yes, we build additions to match your home's existing exterior so the new space looks like it was always part of the structure. Roofline integration and exterior finish are part of every addition we build.

We inspect the existing structure first to identify anything that needs to be addressed before the addition goes up. Older homes sometimes require foundation or structural work, and we account for that during planning.

Yes, our service area covers Jurupa and Monrovia along with Fontana, Riverside, Rancho Cucamonga, Upland, and Highland. Call us to talk through your project regardless of which area you are in.

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Hours

  • Monday 8:00 AM - 5:00 PM
  • Tuesday 8:00 AM - 5:00 PM
  • Wednesday 8:00 AM - 5:00 PM
  • Thursday 8:00 AM - 5:00 PM
  • Friday 8:00 AM - 5:00 PM
  • Saturday Closed
  • Sunday Closed

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