Home addition and second-story design in Tampa
An addition has to match the house, fit inside the setbacks and tie into a roof and structure that were built decades ago. The design decides whether it looks like it was always there or like a box someone attached.
Additions we design
- A primary suite on a house that only has small bedrooms
- A second story on a one-story block house
- A bigger kitchen and family room across the back
- A garage conversion into a bedroom, office or suite
- An in-law suite attached to the house
- A home office or studio that needs its own entrance
What's in the drawings
Existing-conditions plan
A measured drawing of the house as it is, which the county requires and the builder relies on.
New floor plans and elevations
The addition and how it connects, with rooflines and finishes matched to the original.
Structural design
Foundations, beams, and the roof and wall connections between old and new, sealed as required.
Second-story analysis
Whether the existing walls and foundation can carry a second floor, and what reinforcement is needed if not.
Mechanical and electrical layout
Where the new rooms get air, power and plumbing, so the bids aren't full of allowances.
How an addition design goes
- Measure and check zoning. We measure the existing house, then confirm setbacks, lot coverage, impervious area and height limits so the addition is sized to what's allowed.
- Concept options. Two or three ways to add the space, with the trade-offs in cost, yard and how the rooms connect.
- Construction drawings. Demolition plan, new plans, elevations, sections, and structural sheets for the connection to the existing house.
- Permit submittal. The set is prepared for the county or city, and we answer reviewer comments.
What affects the price
- Square footage and whether it's a single-story or second-story addition.
- How much of the existing house changes to connect it.
- Whether a survey or existing-conditions drawing already exists.
- Structural complexity, especially second stories on block houses.
- Flood zone status and whether substantial-improvement rules apply.
You get a written scope and fee for the design work before anything is drawn.
Additions on Tampa Bay houses
The typical candidate is a 1950s to 1970s concrete block ranch with three small bedrooms and one and a half baths. The block walls are strong, but the roof trusses and footings were not designed for a second floor, so a second story usually means new bearing points or a steel frame. Setbacks in City of Tampa neighborhoods are tight, which is why so many additions go up instead of out.
In flood zones, an addition counts toward the substantial-improvement threshold. If the value of the work exceeds a set share of the building's value, the whole house may have to meet current elevation rules. We look at this before concept design so there are no surprises at the permit counter.
Common questions
Can my house take a second story?
Many block houses can with reinforcement, and some can't without rebuilding walls. An engineer's review of the foundation and walls is part of the design, and we tell you early if going out makes more sense than going up.
How close to the property line can I build?
That depends on the zoning district and whether you're in the city or the county. Side setbacks on older Tampa lots are often seven feet, but there are exceptions. We confirm yours before drawing.
Will the addition look like part of the house?
That's the goal. Matching roof pitch, eave height, window proportions and materials is most of what makes an addition disappear into the original.
Do I need a survey?
Usually, yes. The county wants to see the addition on a current survey, and the design needs accurate property lines. If you have one from your closing, it may be enough.
Related services
- Whole-home remodel designReworking the floor plan of an existing house, with structure and permits handled.
- ADU and guest house plansBackyard cottages, garage apartments and in-law suites, sized to what your zoning allows.
- Permit drawingsDrawings prepared and sealed for Hillsborough, Pasco and Pinellas building permits.
Areas we serve
Additions and second stories across Tampa and these nearby communities: