Location: Twain Harte, CA

Room Addition Services

Room Addition in Twain Harte, CA

We're a 5-Star, Award-Winning Home Addition Contractor Serving Twain Harte & Tuolumne County

A room addition (also known as a bump-out addition) is a new structure built onto an existing home to create extra space. The team at Cornerstone Construction is highly experienced at designing and building room additions in Twain Harte, CA, and The Valley. We take immense pride in being Twain Harte's premier room addition contractor, with an award-winning, 5-star reputation.


Throughout the Twain Harte area, home additions are incredibly popular, as they not only add valuable living space but also increase home equity. Homeowners have various reasons for adding a room to their house, ranging from second-story additions to extended family rooms.

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Room Addition

Whether it's expanding an existing room or constructing an entirely new one, common room additions include:

  • Second-story addition
  • Sunroom addition (or four seasons room)
  • Family room addition
  • En-suite bedroom addition
  • Living room addition
  • Kitchen addition
  • Great room addition
  • Dining room addition
  • Gym addition
  • Garage addition

For each of these home improvements, Cornerstone Construction’s crew of room addition contractors and architects can manage everything from start to finish.


Additionally, we’re experts in permits, building codes, state law requirements, and ordinances issued by the city of Twain Harte, CA. We manage the processes needed to acquire the proper building and zoning documentation, so you don't have to worry about it.

Room Additions vs. Accessory Dwelling Units

Contrary to home additions, an accessory dwelling unit (AKA an ADU, granny flat, or mother-in-law house) acts as a stand-alone home. It has its own kitchen, bathroom, bedroom, and living space. An ADU is a new structure that is attached or detached from the existing residence. It can act as a guest house, rental unit, separate living or workspace, or pool house.

Room Addition Services

Cornerstone Construction brings over 18 years of experience in new construction and home remodeling across Twain Harte, CA, from Copperopolis to Bear Valley and beyond. We’re a full-service home addition contractor, equally dedicated to high-quality craftsmanship and unbeatable customer service. Your satisfaction and comfort are our number one priority. In fact, in many cases, our clients can comfortably remain in their home during construction.

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Complete Room Addition Services by Cornerstone Construction in Twain Harte, CA

Cornerstone Construction can manage every facet of building your Twain Harte room addition, including design, architecture, and engineering. However, our general contractors and designers are happy to partner with third parties with whom you plan to help build an addition.

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Recent Twain Harte Home Addition Projects

Cornerstone Construction has built home additions across Tuolumne County. Our service area includes Sonora, Pinecrest, Groveland, and more. Here’s a look at some of our recent home addition projects. Contact us today to discuss your needs and get a free home renovation quote!

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Areas We Service

At Cornerstone Construction, we're proud to extend our services to the following areas:

  • Cedar Springs, CA
  • Chinese Camp, CA
  • Cold Springs, CA
  • Columbia, CA
  • Dardanelle, CA
  • East Sonora, CA
  • Groveland, CA
  • Jamestown, CA
  • Long Barn, CA
  • Mi-Wuk Village, CA
  • Pinecrest, CA
  • Phoenix Lake, CA
  • Sierra Village, CA
  • Sonora, CA
  • Soulsbyville, CA
  • Strawberry, CA
  • Tuolumne, CA
  • Tuttletown, CA
  • Twain Harte, CA

Contact us today to bring your vision to life in these beautiful communities.

(209) 352-3354

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No matter the scope or scale of your project, Cornerstone Construction is committed to exceeding your expectations and bringing your vision to life.

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