Second Story Addition

There are structural solutions that make it possible to add a second level to your home, such as installing a new perimeter beam around the existing foundation. This is where the expertise of a licensed structural engineer becomes essential. For a project of this scale, a full set of working drawings must be created to guide construction, whether you are planning a second story addition or a mother-in-law suite.
At Rhino Design Build, we streamline this process by working with experienced designers and draftsmen who can produce precise CAD drawings of your new space. This ensures that your project is thoughtfully planned, structurally sound, and fully compliant with the City of San Antonio’s building requirements.

Once your home remodeling or second story addition has been approved, the next step is to evaluate any existing systems or obstacles that may affect construction. This includes identifying plumbing vents, HVAC equipment in the attic, electrical lines, chimney flues, or other mechanical components that may be in the path of the new living space.
In some cases, these items will need to be relocated or modified to accommodate the design. If you’re fortunate, they may already be positioned out of the way, allowing construction to proceed more smoothly and cost-effectively. At Rhino Design Build, we carefully assess these factors during the planning stage to minimize surprises and ensure a seamless build.

Once your home remodeling or second story addition has been approved, the next step is to evaluate any existing systems or obstacles that may affect construction. This includes identifying plumbing vents, HVAC equipment in the attic, electrical lines, chimney flues, or other mechanical components that may be in the path of the new living space.
In some cases, these items will need to be relocated or modified to accommodate the design. If you’re fortunate, they may already be positioned out of the way, allowing construction to proceed more smoothly and cost-effectively. At Rhino Design Build, we carefully assess these factors during the planning stage to minimize surprises and ensure a seamless build.

Never assume that a new second story room addition can be supported by the existing joists or rafters. Standard framing materials such as 2x4s, 2x6s, or even 2x8s were never designed to carry the significant weight of an additional level. Attempting to build on top of them would create serious safety and structural risks.
In some cases, larger joists such as 2x12s may be considered as a cost-saving option. However, this decision must be guided by local building codes and verified by a licensed architect or structural engineer. At Rhino Design Build, we work with trusted professionals to ensure that every second story addition is engineered for strength, safety, and long-term durability.

Common Structural Mistakes to Avoid in a Second Story Addition

✔ Using Existing Joists or Rafters – Standard 2x4s, 2x6s, or 2x8s cannot safely support the load of a new level.
✔ Skipping a Foundation Inspection – Without confirming the foundation’s strength, the entire addition may be at risk.
✔ Ignoring Local Building Codes – Every project must comply with City of San Antonio requirements to ensure safety and approval.
✔ Not Consulting Professionals – Structural engineers and architects are essential for designing safe, code-compliant plans.
✔ Underestimating Mechanical Relocations – Plumbing vents, electrical lines, and HVAC systems often need to be moved or upgraded.
✔ Cutting Corners on Materials – Using undersized or low-quality materials can compromise both safety and long-term value.

New engineered floor joists are available in a range of depths, typically from 10 inches to 16 inches, with different top and bottom flange options. These variations determine how far each joist can safely span without requiring additional support. In general, the deeper the joist, the longer the span can be achieved without the need for columns or load-bearing walls beneath.
Once the engineered floor system is installed, the rest of the framing and construction follows the same process as building a traditional two-story home. One of the more complex aspects of the project is tying the new roofline into the existing structure. This step requires precision and experience, which is why hiring the right San Antonio contractor is essential. At Rhino Design Build, we specialize in second story additions that are structurally sound, seamlessly designed, and built to the highest standards.

Designing the stairway for a second story addition can be one of the more challenging aspects of planning, especially if your home does not currently have stairs. Because staircases require a significant amount of square footage, their placement must be carefully considered to maximize functionality without wasting valuable space.
Depending on the layout of your home, one option may be to position the staircase along an exterior wall, which often provides the most efficient use of space. A qualified architect or builder will evaluate your floor plan and recommend the best location, ensuring the new stairway is not only practical but also blends seamlessly with your home’s existing design.

When planning a second story room addition for your home, it is always wise to speak with friends, family, or neighbors who have gone through a remodeling project before. Their experiences can give you valuable insight into what to expect during the construction process.
While remodeling is not without its challenges, at Rhino Design Build we work hard to make the process as smooth and stress-free as possible. We keep our clients fully informed, educated, and updated on project status every step of the way.
For example, we are currently building a mother-in-law suite above an existing garage here in San Antonio. As soon as the roof was removed, an unexpected rainstorm rolled in. Because we were prepared, our team had tarps ready on-site to protect the home from damage — just one example of how our proactive planning and experience protect our clients’ investments.

A second story room addition can dramatically increase the value, functionality, and comfort of your home. However, living in the house during construction presents unique challenges. Whenever possible, we recommend arranging alternative accommodations for the most disruptive phases of the build. This is especially important for families with small children or homeowners who work from home, as construction is inevitably loud, dusty, and disruptive during working hours.
Even after hours, safety hazards such as exposed nails, electrical wiring, temporary bracing, and construction debris can make living in the home less than ideal. While these inconveniences are only temporary, a little patience — and proper planning — will ensure the reward is well worth it: a beautifully designed, custom second story addition that enhances both your lifestyle and your property value.

Why Homeowners Trust Rhino Design Build for Second Story Additions

✔ Clear Communication – Clients are kept informed and updated at every stage of the project.
✔ Proactive Planning – We anticipate challenges, like unexpected weather, and prepare solutions in advance.
✔ Quality Craftsmanship – Every detail is built to last, with the highest standards of design and construction.
✔ Expert Guidance – Our team provides education and support so clients feel confident throughout the process.
✔ Seamless Execution – From permits to construction, we manage everything for a smooth, stress-free experience.
✔ Trusted Experience – With decades of building expertise in San Antonio, we know how to protect your investment.