When viewers tune into Netflix’s hit political drama The Diplomat, they are instantly transported into some of the most influential, high-security, and intensely guarded rooms in the world. From stately British historical estates to the corridors of Washington power and the sun-drenched romance of the Italian countryside, the series trades in the raw mechanics of geopolitics. However, according to production designer Curt Beech, the show rarely grants its characters the luxury of intimate self-expression through their environments.
(This story contains major spoilers for season four.)
Speaking about the design philosophy behind the fourth season, Beech explains that The Diplomat is ultimately about "bringing the characters together physically but never emotionally in spaces the public don’t get to see."
Unlike traditional television dramas where sets are meticulously tailored to reflect a character’s personal history, family background, or inner psychological state, The Diplomat takes a radically different approach. The high-stakes environment demands that its principal figures—including US Ambassador to the UK Kate Wyler (Keri Russell), Vice President Hal Wyler (Rufus Sewell), and US President Grace Penn (Allison Janney)—remain perpetual outsiders.
"The places may be historical, but they’re almost never personal," Beech notes. "That is what’s so different about this show from a design standpoint. Usually, we’re creating someone’s bedroom or their house, and we dig into their family history and who they are and what they like. We don’t get any of that here because the spaces that they inhabit are not theirs. They are almost always visitors."
The fourth season of The Diplomat hits the ground running—quite literally. The opening episode features a shocking assassination attempt targeting President Grace Penn just outside the historic gates of Windsor Castle. Surviving the attack leaves the president in an increasingly unpredictable state, sending shockwaves through her inner circle, including her husband Todd (Bradley Whitford), Vice President Hal Wyler, and Ambassador Kate Wyler. The ensuing narrative spans across continents, moving fluidly from the historic grounds of Windsor to Washington, D.C., and ultimately culminating in a tense, cliffhanger-heavy G7 summit in Lucca, Italy.
To bring this globe-trotting geopolitical chess match to life, Beech blended a mixture of returning architectural mainstays with an entirely fresh slate of locations across England, New York, and Italy. While interior soundstage sets were constructed at Steiner Studios in New York, iconic filming locations like Wrotham House once again stepped in to represent Winfield House, the official London residence of the United States ambassador. Here, Beech breaks down the key architectural and design elements that defined the world of The Diplomat Season 4.
Windsor Castle
Season 4 opens with an impromptu, high-stakes visit to Windsor Castle. As the American envoy prepares to depart the royal residence for a flight back to the United States, an unknown assailant opens fire, shooting President Penn.
To recreate the sprawling majesty of Windsor Castle and its extensive grounds, Beech and his team engaged in complex cinematic geography, combining nine distinct locations. The exterior establishing shots and the inner courtyard were filmed at Burghley House, while Belvoir Castle, Lancaster House, and the British Foreign Office provided the opulent backdrops for the interior sequences. Meanwhile, sequences set back in the United States utilized the Woolworth Estate, the St. Josaphat Monastery Library, and the Sleepy Hollow Country Club. Additionally, the claustrophobic and grandiose panic room where Kate and Hal find themselves locked down immediately following the shooting was filmed inside the crypt of an Upper West Side church in New York City.
"It’s a lot of different architectural styles, but that is typical of these houses," Beech says. "Windsor has a bunch of things going on because these houses are very, very old, and they’ve been built during different centuries with different people in charge of the construction. We embraced that. We also have a mix of things that are accurate to Windsor Castle and things that aren’t."
The Aircraft Carrier
Following the assassination attempt, the wounded President Penn is rushed to Marine One and airlifted directly to a docked United States aircraft carrier to undergo emergency surgery. To pull off this ambitious sequence, Beech utilized the parking lot at Steiner Studios for the exterior helicopter landing, while transforming a New York City Marine training facility into the carrier’s medical and administrative interiors.
"We did real takeoffs and landings with the helicopter," Beech explains. "While it was on the ground, we dressed the interior because Marine One feels like a private jet inside. It’s very luxurious and well appointed. But you can’t add weight to a helicopter like that without going through a lot of different FAA approvals, so we couldn’t keep it dressed while flying."
Winfield House
As in previous seasons, the stately exterior of Winfield House was brought to life at Wrotham Park, a magnificent country house estate situated in Hertfordshire, England. The production balanced location filming with soundstage construction at Steiner Studios in New York to handle the interior scenes.
"There’s a blue room, a library, and a red room in the real building," Beech says. "The foyer is also there. The green room, the Wedgewood hallway, and the blue study are on stage in New York. It takes a lot of coordination to keep track. The actors are incredible because they’re able to tap back into whatever they were doing at that moment two months ago, and make it feel like they just turned the corner and are walking into a room."
The US Embassy
The striking architecture of the US Embassy in London’s Nine Elms district, which was originally constructed on a London soundstage for the show’s early seasons, was successfully packed up, shipped across the Atlantic, and rebuilt at Steiner Studios for Season 3. For Season 4, the physical layout remained largely untouched.
"We moved some furniture around to get better lighting, but nothing major has changed in those spaces," Beech notes.
The production did, however, capture one pivotal exterior scene on location: a meeting between CIA station chief Eidra Park (Ali Ahn) and deputy chief Stuart Hayford (Ato Essandoh). "That was right around the corner from the embassy, which was incredible to see," Beech says. "That building is in so many different shows now and it’s beautiful."
Eidra’s Apartment
Eidra’s sleek, contemporary apartment—where Stuart eventually moves in as their professional relationship blossoms into a personal romance—was filmed inside a genuine residential property located in Tribeca.
"This is another space that’s personal, but not," Beech observes. "We told the story that she moves a lot for the safety of her position. She’s never in the same place for very long. So it’s very stark and doesn’t have a lot of personality."
The White House
For the fourth season, Beech implemented significant visual shifts within the White House sets. Rather than returning to the Oval Office seen in prior seasons, the creative team shifted the narrative focal point into President Penn’s private study.
"The president typically does have a study, and it’s right off the Oval Office, but it’s very small," Beech explains. "You see pictures of Obama sitting in his. We made a very large study for her that has three separate zones—a work zone, a meeting zone, and a power zone where her desk is. That does not exist in the real White House, but it does in our White House."
In another memorable sequence, Todd can be seen swimming laps in the White House pool, another architectural feature that does not exist in the real executive mansion today. The scene was filmed within the basement of the Woolworth Building in Tribeca.
"There used to be a pool years and years ago in the White House," Beech says. "They plastered it over, and it’s now the press briefing room. But you see in the old pictures there was a really beautiful room with arched windows and that’s where the pool was."
10 Downing Street
Although 10 Downing Street has been a recurring fixture throughout the series, the production required a brand-new set for Season 4.
"That was filmed at a location in the UK that was no longer available, so we built it on our stage," Beech says. "We also used the Steinway Mansion in New York for the building’s iconic stairs."
Eagle-eyed viewers tracking the political upheaval midway through the season—when a new prime minister ascends to power—will notice subtle updates to the room’s set dressing. "It got a bit more sparse, indicating that she had just gotten there," Beech points out. "They had moved him out; she hadn’t completely moved in yet. So some pictures are off the walls, and the lamp on his desk changed. It’s small stuff."
The famous exterior of 10 Downing Street was cleverly stitched together using practical elements and visual effects. "We wound up building the doorway and the lectern in a parking lot in Brooklyn with a green screen, and then we added it together with what we shot in London on that street," Beech details.
The Prime Minister’s Residence
Midway through the season, Kate travels to meet the newly appointed British prime minister at the family estate of the prime minister’s husband, offering a rare window into the private life of the nation’s leadership. To construct this sprawling manor house, Beech utilized two separate properties: the entry and security gates were shot at Ingatestone Hall in Essex, while the sprawling interiors were filmed in a private residence on Long Island.
"In England with these huge estates, it’s very expensive to keep them going, so the family compresses to living in one wing of the house," Beech says. "We wanted to tell that story about her house, and there’s a coldness to it. Her office space is in a room that is gigantic for an office. And there are heaters everywhere."
Lucca, Italy
The fourth season hurtles toward its dramatic conclusion against the picturesque backdrop of Lucca, Italy, where world leaders gather for a tumultuous G7 summit. The production spent six weeks on location in Lucca, shooting across eight distinct sites.
Filming locations included Villa Viesca—the former summer residence of Salvatore and Wanda Ferragamo—and Dimora Ghirlandaio, a Tuscan resort, both of which doubled as the private villas housing the American delegation. Meanwhile, the high-level G7 diplomatic meetings were staged at the recently restored Villa Reale di Marlia, Villa Medici in Poggio a Caiano, and Villa Medicea La Petraia.
"We were going to play Florence for Lucca, but we leaned into Lucca as Lucca, and it felt better and more authentic," Beech says. "We went to the Pitti Palace in Florence and determined that it wasn’t right. Most of the time, the vibe is very modern in these meetings. We decided to make it very classical. We embraced the vibe of this incredible room with floor-to-ceiling frescoes, and we built custom desks that had little fresco elements that matched the walls. These meetings are very bespoke, so everything is always created for them. We did that, but in a slightly different manner."
