Picture two new houses of about the same size. Each has roughly 2,200 square feet of finished floor space, which is the typical size of both groups in this comparison. One has three bedrooms and the other has four. You might expect the four-bedroom house to give up a bathroom to fit the extra room. The Census Bureau's 2025 construction data points the other way. In this size band, the four-bedroom house is more than twice as likely to come with a third full bathroom.
The figures come from the Survey of Construction, which follows a sample of new single-family houses through permits, building and sale. OneFabHome took the houses finished in 2025, kept the ones whose final floor area fell between 2,000 and 2,499 square feet and wasn't altered by Census for privacy, and compared them by bedroom count. That leaves 1,471 three-bedroom homes and 1,220 four-bedroom homes in the sample.
34.4% of four-bedroom homes have a third full bath
Among three-bedroom homes in this band, 83.8% have exactly two full baths, and only 15.3% have three or more. Among four-bedroom homes, two full baths is still the most common layout at 65.5%, but 34.4% have three or more.
Full bathrooms in new homes of 2,000 to 2,499 sq ft
Source: Census Bureau Survey of Construction, homes completed in 2025, weighted.
The gap isn't a quirk of townhouses or other attached homes, which can follow different floor plans. Looking only at detached houses, 31.4% of four-bedroom homes have three or more full baths, against 11.6% of three-bedroom homes.
Half bathrooms tell a smaller story in the other direction. 54.5% of three-bedroom homes in this band have at least one half bath, against 48.0% of four-bedroom homes. The survey counts bathrooms but doesn't record where in the house they're, so it can't show whether a missing half bath was swapped for a full one.
Same floor area, same share of multi-story homes
An easy explanation would be that four-bedroom homes are taller, with a second floor giving the extra room and bath. At this size, the data doesn't show that. 49.2% of the three-bedroom homes and 50.2% of the four-bedroom homes have two or more stories, within a point of each other. Census counts one-and-a-half story houses with the two-story group.
The typical floor area is also the same: the weighted median is 2,200 square feet for both groups. So the four-bedroom houses fit one more bedroom, and often one more full bathroom, into the same typical floor area. The survey doesn't measure rooms, so it can't say how the rest of the space differs between the two plans. That's the question to answer on a viewing.
How common each layout is at 2,000 to 2,499 square feet
At this size, buyers have plenty of both. 49.3% of new homes in the band have three bedrooms and 42.9% have four. Homes with two bedrooms or fewer (4.9%) and homes with five or more (2.9%) are rare. So at this size, new homes are split almost evenly between the two plans, which makes it a fair place to compare them.
The pattern grows with house size
The same comparison in the neighboring size bands shows how quickly the third bathroom arrives. In homes of 1,500 to 1,999 square feet, 14.7% of four-bedroom homes have three or more full baths, against 3.6% of three-bedroom homes. In homes of 2,500 to 2,999 square feet, the figures rise to 58.3% and 24.9%.
Share with three or more full bathrooms, by house size
Source: Census Bureau Survey of Construction, homes completed in 2025, weighted.
Two things follow. In all three bands, the four-bedroom home is far more likely to have the third full bath. And in the 2,500 to 2,999 square foot band, most four-bedroom homes have one. If you're shopping around 2,000 to 2,499 square feet, you're in between: about one four-bedroom plan in three has the third full bath, and fewer than one three-bedroom plan in six.
What this means when you compare plans
- Don't assume a four-bedroom plan at this size gives up a bathroom. One in three of them has a third full bath, more than twice the three-bedroom rate.
- With the same typical floor area, measure the secondary bedrooms and closets rather than going by the bedroom count.
- Check the powder room. Four-bedroom plans in this band are a little less likely to have a half bath, which matters if guests would otherwise use a bedroom bathroom.
- If you don't need the fourth bedroom, compare how the three-bedroom plan uses the same typical floor area: room sizes, storage and living space.
Questions to ask on a viewing
- How big is each secondary bedroom, wall to wall, and will a queen bed and a desk fit in the smallest one?
- Where is the third full bathroom, and is it shared between two bedrooms or attached to one?
- Is there a powder room on the main living floor, or will visitors use a bedroom bathroom?
- Does the listed square footage include a finished basement or attic? Census counts finished basement and attic space in its floor area figure.
More from the same survey
This is the first of five articles that use the Survey of Construction to answer questions buyers of new homes actually ask. The others look at how long a house takes to build, where the laundry goes in two-story homes, when a three-car garage is likely and how many new homes come with a homeowners association.