When building up makes sense
Most Tucson additions go out onto the yard, because single-story homes on slab are the norm and ground-level work is simpler. Building up makes sense when the lot is tight, when setbacks or a pool leave no room to expand outward, or when a second floor would capture a mountain view. It is also the most structurally demanding addition you can do, so the planning has to be right.
Can your house carry a second story?
This is the first question, and only an engineer can answer it for your house. A one-story home was designed to carry one story, so a second floor puts new weight on the existing footings, walls and slab.
Footings and foundation
Existing footings may need to be enlarged or supplemented with new footings and posts. Caliche affects how that digging goes. Sometimes the answer is a separate structural frame that carries the new floor down to new footings without loading the old walls.
Walls: frame or block
Wood-frame walls may need added studs, headers or shear walls. Masonry block homes, common in Tucson, need the block walls and bond beams checked before anything is stacked on them. Either way, the framing and structural work is done by our own crew.
The floor system
The existing ceiling joists or roof trusses were not built to be a floor. The new floor is framed as its own system, sized to carry rooms, furniture and people.
Engineering and permits
Expect a structural engineer's design and sealed calculations as part of the permit set. Pima County's custom home submittal list, for example, calls for sealed structural calculations when a design uses engineered systems, and the same thinking applies to building on top of an existing home. Inside the City of Tucson, additions need plans, a permit and inspections per the city's residential permits page. Oro Valley, Marana and Sahuarita have their own offices.
Zoning sets a maximum building height for your zone, and many HOAs limit or forbid second stories outright, especially where views are protected. In Tucson's historic preservation zones, such as West University and Armory Park, exterior additions also go through historic design review. We check all three before design.
Planning the build
Partial second story
You don't have to build over the whole house. A room or suite over part of the home, such as over the garage, can mean fewer walls to reinforce and less of the roof removed. The engineer's review tells us which parts of the house can carry the load most easily.
Stairs take space downstairs
A staircase needs a footprint on the first floor, often the size of a small bedroom or a big closet. Where it lands shapes the whole design.
The roof comes off
For a full second story, part or all of the existing roof is removed, which opens the house to weather. In Arizona the monsoon runs roughly from mid-June to the end of September, so we plan the roof-off phase with that in mind and protect the house with temporary covers.
Living at home
Some second-story work can be done while you live in the house. When the roof is off over bedrooms, many families stay elsewhere for part of the job. We talk through that honestly before you commit.
Cooling a second floor
Heat rises, and a second floor under the Tucson sun runs hot. Insulation, window shading and a separate cooling zone or mini-split are part of the design, not an afterthought.
Matching outside
New walls get stucco to match the house, and the new roof is built to suit the style, with our own crew on the roofing.
Up, out or a casita?
Going up is usually the most complex option, and it involves more engineering, more temporary weather protection and more disruption to daily life than a ground-level addition. Before choosing it, it's worth comparing a ground-level primary suite addition, a garage conversion or a detached casita (see casita vs home addition). Our home addition cost guide covers what moves the price.
How we approach a second story
We walk the house, look at the foundation, walls and roof structure, and talk through what you want upstairs. If it looks feasible, the next step is engineering, then plans, the permit and a written estimate. One licensed team (AZ ROC #344537) handles structure, framing, roofing, stucco and interiors.