Why Honest Ranges Beat Exact Prices
Ask five contractors what a home addition costs and you may hear five very different numbers. That is not a trick. It happens because every house is different. The soil under the slab, the age of the roof, the distance to the power panel, and the flood zone on your street all change the price. Any number you read online is a starting point. The real number only comes after a contractor walks your home and writes up a detailed estimate.
Keep that in mind as you read the ranges below. They reflect typical Orlando-area projects: a single-story addition on a concrete slab, standard finishes, and work done to Florida Building Code. Fancy finishes, tricky lots, and structural surprises can push costs higher.
Typical Cost Ranges by Project Type
Bump-out addition: $25,000–$50,000
A bump-out adds just a few feet to one room — maybe pushing the kitchen out four feet for an eating area. Because it is small, it costs less. Most bump-outs fall in the $25K–$50K range. Costs climb if the project needs new electrical runs, plumbing for a sink, or structural work on the existing wall.
Single-room addition: $50,000–$90,000
Adding one full room — a family room, a bedroom, a home office — usually runs $50K–$90K in Orlando. This covers the new foundation or slab tie-in, framing, roof, windows, drywall, paint, flooring, and basic electrical. The room size matters most here. A 12-by-16-foot room sits at the low end; a 16-by-24-foot room pushes toward the high end.
Master suite or large living-space addition: $80,000–$150,000
A bigger addition with a bathroom or a luxury bedroom often lands between $80K and $150K. Bathrooms are expensive per square foot because of plumbing, tile, and waterproofing. A master suite with a walk-in shower and a large closet is one of the most common additions in Orlando, and it sits in this range for most homes.
Second-story addition: $150,000–$300,000+
Going up costs more than going out. A second-story addition means opening the roof, checking that the existing structure can carry the new floor, and often living under active construction for months. Projects in the Orlando area commonly run $150K–$300K or more, depending on square footage and finishes.
What Drives the Cost Up or Down
- Size. More square feet means more of everything: concrete, lumber, roofing, drywall, paint, and labor. Cost per square foot often drops a little as the project gets bigger, but the total always climbs.
- Plumbing. Any room with a sink, toilet, or shower costs more. If the new bathroom sits far from the existing plumbing lines, the price climbs because of longer pipe runs and slab work.
- Electrical panel. Older Orlando homes sometimes have panels that cannot handle a big addition. A panel upgrade adds cost but keeps the house safe.
- Finishes. Stock cabinets, laminate counters, and standard tile keep costs down. Custom cabinets, stone counters, and high-end fixtures can add tens of thousands.
- Structural work. Cutting a wide opening in an existing wall may need a steel or engineered beam. That is normal work, but it adds labor and material costs.
- Access. A backyard with easy equipment access is simple. A tight side yard that forces hand-carried materials slows the crew down and adds cost.
Florida Factors That Change the Quote
Orlando projects carry a few costs that homeowners in other states never see. The Florida Building Code requires wind-rated construction, and new windows in the addition must meet impact or windborne-debris standards. In flood-prone areas — near Lake Eola's low spots, the Econ River, or west Orange County — finished floor elevations and floodproofing add cost. Termite protection is also required by code: soil treatment and termite shields around new foundations. Finally, Florida's energy code requires good insulation and efficient windows, which is worth doing anyway in a city with nine months of air conditioning.
How to Get an Honest Quote
Get at least three written estimates. Each one should list the same line items: foundation, framing, roof, windows and doors, electrical, plumbing, HVAC, insulation, drywall, flooring, paint, and permits. If one bid is far lower than the others, ask what it leaves out — permits, engineering, and final grading are the usual missing pieces. A good contractor will also explain allowances: the budget set aside for things you pick later, like tile and light fixtures.
Get Your Real Number
The ranges above get you started, but your home deserves a real number. Request a free consultation and a contractor will walk your property, listen to what you want, and put together a written estimate for your specific project — no guesswork, no pressure.