Cosmo and Janet DeNicola’s 3-acre property is located in Bryn Mawr, Pa., but a serene expanse of grapevines in the backyard looks like Tuscany.

“I’m Italian,” explains Mr. DeNicola, 66, cueing up Andrea Bocelli to blast out of the speakers hidden among the vines. “This is my little piece of Italy.”

The DeNicolas have been married since they were teenagers.

The DeNicolas have been married since they were teenagers.

Photo: Will Figg for The Wall Street Journal

The DeNicolas’ goal in overhauling the Main Line property, which they bought in 2014, was to bring a European aesthetic to the Pennsylvania farmhouse-style home, while also integrating their love of animals and nature. They spent three years gut-renovating the house, adding a circular turret to the main entrance. On the grounds the couple built the vineyard and an aviary, where Mr. DeNicola keeps pigeons. To furnish the six-bedroom, 11-bathroom house, Mrs. DeNicola, 65, took multiple trips to Europe to shop for antiques with the interior designer Justin Shaulis. The project cost roughly $10 million including purchasing the property, Mr. DeNicola said.

“They wanted it to feel like a home that had been in the family for generations,” said Mr. Shaulis, who worked closely with Mrs. DeNicola.

Both entrepreneurs, the DeNicolas met as teenagers in their native Philadelphia while working at a Gino’s Hamburgers, a fast-food chain that has since closed.

In 1981, the couple founded a company, Amtech Software, that makes computer software for packaging manufacturers. In the 1990s, Mrs. DeNicola spun off a tech-support company called Futura Services, which enabled the business to expand into healthcare. Their business interests now include technology, entertainment, healthcare, media, and even sports—for years they were co-owners of the Philadelphia Soul, an Arena Football League team. Upstairs in Mrs. DeNicola’s expansive closet, which has two balconies, is a football signed by former NFL quarterback and fellow Soul co-owner Ron Jaworski. It is displayed behind glass next to her Louis Vuitton handbags.

After raising their children in Bucks County, Pa., the couple downsized to a house on Philadelphia’s Main Line in 2011. After moving in, however, they realized the house was too small for their various family, business and charity events. With Mr. Shaulis, who has worked on several homes for the couple, they started looking at other properties nearby, choosing their current home for its sizable acreage and privacy, though initially Mrs. DeNicola wasn’t wild about the fieldstone-and-clapboard house.

“I just did not like the outside of the house at all,” she recalled.

But Mrs. DeNicola relishes a project, so they bought the property for $3.2 million and hired Main Line architect F.L. Bissinger to revamp it. The facade got a new white-columned portico and a large, rounded turret topped with an oriole dormer window. A circular pattern of inlaid granite sits in the middle of a rounded, European-style forecourt. The cedar-shake roof was replaced with slate with copper detailing in a fleur-de-lis pattern. Clapboard siding on the second floor was replaced with stucco.

The DeNicolas overhauled the interior layout, removing several of its many staircases, enlarging the kitchen, and converting one of the bedrooms into a dressing room for Mr. DeNicola.

The DeNicolas’ two young granddaughters, who often sleep over on weekends, each has her own bedroom and en-suite bath. In 8-year-old Raisa’s room, the bedding and drapes are in purple and green florals, and a pillow is monogrammed with an “R.” Korbyn, 6, has a blue-and-white color scheme with green accents.

To furnish the rest of the house, Mrs. DeNicola and Mr. Shaulis made multiple trips to Europe, starting with an antiques fair in Parma, Italy. She had a few antiques in previous homes, but this time she wanted to place more of an emphasis on them. “I would always admire the things that my grandmother had and I wish I had some of her things,” she said. “So that’s what made me think, ‘I’m gonna go buy somebody else’s grandmother’s stuff.’ ”

The pair traveled through Florence, Tuscany, Venice and Paris, choosing furniture, light fixtures and fireplace mantels along the way, as well as smaller items such as a Murano-glass turtle that now sits in the living room. In Murano, they also found the chandelier that now hangs in the kitchen, later commissioning a master craftsman to create three matching pendant lights.

Birds, animals and nature are a major theme throughout the property, where the DeNicolas live with their dogs, Kirby and Missy. A copper cupola on the roof is intended as a roost for birds. In the foyer, custom-made silk wallpaper depicts a bucolic natural setting; hand-embroidered gold accents highlight details such as a bird’s throat and a butterfly’s wings. An Edwardian-era center table has a peacock design, and peacocks also appear in the foil wallpaper of a powder room. On a window seat at the top of the curving staircase sits a leopard sculpture adorned with a necklace.

The DeNicolas also made significant changes to the landscaping. Family gatherings often take place in the vineyard, at a large wooden table in the center of the vines. The secluded area is equipped with surround sound, a television and a 20-foot-wide screen for movie nights. The grapes are only for eating. “When you’re back here, look how quiet and private it is,” he said.

Next to the vineyard is the aviary, a heated, shingled wooden building where Mr. DeNicola can be found every day at 6 a.m. feeding his pigeons. Mr. DeNicola kept pigeons growing up in Philadelphia; the hobby was popular among Italian immigrants at the time, although “you had to be careful that your Italian grandmother didn’t try to cook it,” he wisecracked. The aviary, he said, “was a return to my roots.”

A view through the hedges.

A view through the hedges.

Photo: Will Figg for The Wall Street Journal

Unlike typical urban street pigeons, Mr. DeNicola’s birds are called “fancies”—domesticated breeds with elaborate feathers and coloring. “They’re the supermodels of pigeons,” he said.

On the weekends, Mr. DeNicola said, “I love to go out there and sweat a little bit and clean.” Caring for the birds helps him stay centered and focused in the moment, because “If you’re not careful, the birds will poop on your head,” he said.

Write to Candace Taylor at Candace.Taylor@wsj.com