House Building in Roswell, GA

One of the first big choices in planning a new home is whether to spread it out on one level or stack it on two. For a new house in Roswell, that decision affects the foundation, the roof, the structure, the plumbing layout and the heating and cooling design, as well as how the family will move through it for years to come.

Below is a side-by-side look at the trade-offs, so you can weigh them against your lot and your household.

Footprint, lot and foundation

For the same living area, a single-story house covers about twice as much ground as a two-story one. That means a larger foundation and more site work, and on a narrow or sloping lot a long ranch may simply not fit well. A two-story plan leaves more yard and can sit farther from the property lines.

Because the foundation is one of the more costly parts of any house, a ranch carries more foundation for every square foot of living space. On a lot that falls away, a one-story plan over a walkout basement can combine single-level living with extra space below.

Roof, walls and the building envelope

The roof follows the same math. A one-story house needs roughly twice the roof area of a two-story house with equal floor space, which means more roofing, more attic to insulate and ventilate and more gutters. A two-story house has more wall area relative to its roof, and its upper windows and siding require ladders or scaffolding for installation and later upkeep. A compact two-story shape usually has less exterior surface per square foot of floor, which helps energy use.

Structure and the second floor

A second story adds a floor system, usually engineered joists or floor trusses, that must span between bearing walls or beams. Bearing walls upstairs should stack over bearing walls below, and where an open first-floor room has nothing underneath, a beam carries the load to posts and footings. A two-story foyer or great room means tall walls that need careful bracing and engineering.

The stair is its own structural and layout decision. It takes space on both floors, needs headroom along its whole length and fixes where the upstairs hall begins, so its position should be settled before anything else on the second floor.

Plumbing and fixtures on one level or two

In a two-story house, stacking bathrooms over each other and over the kitchen keeps drains short and lets them share a wet wall. Drains from upstairs have to pass through the first-floor ceiling, so they belong in closets or chases rather than above the dining room. An upstairs laundry needs a pan and drain under the washer.

A one-story house spreads fixtures out, and a bathroom at the far end of a long plan can mean a wait for hot water; a recirculation system or a second water heater solves that. On a slab, under-slab plumbing is fixed once the concrete is poured. Light fixtures count too: a chandelier over a two-story foyer needs a plan for reaching it to clean and change bulbs.

Heating and cooling by floor

Heat rises, and the upper floor of a two-story house sits right under the roof, so it tends to run warmer in summer. Two separate systems, or one system with zones and dampers, help balance the floors, and each level needs adequate return air. A one-story house can often work with a single system, but its ducts run long distances through the attic and need careful sealing and insulation. Either way, mechanical coordination includes finding a home for each air handler.

Living in it now and later

A single level suits young children, older relatives and anyone who would rather skip stairs, and gutters and windows are easier to reach. Two stories separate sleeping areas from living spaces, give bedrooms more privacy and can capture better views. Many families settle on a middle path, with the primary suite on the main floor and other bedrooms upstairs. For some households, adding a main-floor suite to the current house does the same job, and our page on Roswell room additions describes that route.

Roswell permits and the Fulton County sewer connection

Roswell is in Fulton County. The city’s Building Division issues permits for installing, altering, repairing or replacing plumbing, and an owner qualifies only as a contractor holding a license or as the occupant of the home being altered. Routine maintenance such as painting needs no permit.

For the sewer, Fulton County’s connection flowchart has the plumber tie into the existing tap and leave it exposed for county inspection, and the county sends its connection authorization to the city’s permitting department before a certificate of occupancy. The county’s lateral connection requirements ask the plumber to call the county inspector at least three days before installing the lateral.

Frequently asked questions about one-story and two-story plans

Does a one-story house cost more to build than a two-story house of the same size?

Often it does per square foot of living space, because it needs more foundation and more roof for the same floor area. A two-story house adds a stair, a floor system and more work at height. The real difference depends on the plan, the lot and the finishes, so pricing both versions for your property gives the clearest answer.

Does a two-story house need two HVAC systems?

Not always, but upstairs rooms tend to run warmer in summer because heat rises and the roof sits just above. Two systems, or one system with zones and dampers, help keep both floors comfortable. Return air on each level and well-designed ductwork matter either way, and a load calculation for each floor guides the choice.

When does Fulton County inspect a sewer lateral for a house in Roswell?

Fulton County’s lateral requirements say the plumber must call the county inspector at least three days before installing the lateral. The county’s flowchart has the plumber connect to the existing tap and leave it exposed for inspection, and the county’s authorization then goes to the city’s permitting department before a certificate of occupancy.

Compare both options on your own lot

Not sure whether one level or two suits your property? Call 404-409-4448. We can visit the lot in Roswell, talk about how your household lives and, if it helps, price both a one-story and a two-story version so the comparison is concrete. For more on our new-home work, see building a house in Georgia with us.