HBO’s Harry Potter Budget: Filings Point to About $25 Million an Episode and Over $200 Million for Season 1

HBO’s Harry Potter series is on course to rank among the most expensive shows the network has made, according to accounts filed in the UK. The first season could average about £18.8 million ($25.2 million) per episode, Deadline reports, and TheWrap, in a report published October 23, puts the investment in season 1 at more than $200 million.

A Paper Trail Through Companies House

The figures come from Plum Jam Productions, the HBO-owned company producing the show in the UK. Its filings with Companies House, first reported by The Times, show spending of £147.4 million ($197 million) by the end of 2025. Filming began in July 2025 and did not wrap until May 2026, so the final cost for season one will be higher.

Corporate accounts of this kind are a useful window into a production that has otherwise said little about its finances. They are not, however, a line-by-line budget. They capture what a company reported for a specific period, and the picture they give of a long shoot depends on when the books were closed. In this case, the cut-off fell partway through filming, which is why every estimate built on the filings comes with a caveat.

How the Per-Episode Estimate Was Built

Deadline calculated its per-episode estimate from the company’s reported 2025 revenue of £130.6 million ($175 million). Dividing that sum across the season’s episodes yields the roughly £18.8 million ($25.2 million) average that has drawn so much attention. Another report put the season at as much as £150 million ($201 million).

TheWrap approaches the question from a slightly different angle. It puts the initial setup at about $200 million (roughly £150 million), says the figure is derived from earnings filings and may not capture full production costs, and reports that episodic budgets are on par with those of House of the Dragon and The Last of Us. The wording matters. A derived figure can understate spending that has not yet been booked, or reflect accounting choices that differ from how a studio describes its own budget.

Winter Is Coming, citing The Times, notes that the end of 2025 was roughly halfway through production, and projects a final budget above $250 million, or about $31.25 million per episode across eight episodes. That projection simply extends the reported spending to the full length of the shoot, and it rests on the assumption that the second half of production costs roughly what the first did.

Standing Next to the Heavyweights

On the Deadline estimate, the series would sit in the same bracket as the final season of Game of Thrones, widely reported at $15 million an episode, and The Last of Us. TheWrap’s per-episode estimates for those comparison titles are about $15 million for the final season of Game of Thrones, $15 million to $20 million for House of the Dragon and $10 million to $15 million for The Last of Us.

Placed against those numbers, a $25 million average stands out. Even the lower reading of the filings, which works out to roughly $24.5 million an episode if all spending to date went to season one’s eight episodes, sits above every comparison listed. The gap suggests HBO is treating the project as a flagship franchise launch rather than as a standard prestige drama.

The practical consequence is that any single number should be read as a range. Estimates built on revenue, on cumulative spending and on projections for the rest of the shoot will naturally differ, and they will remain provisional until HBO or its parent company publishes more detailed information, or until later filings cover the full production period.

Why the First Season Costs the Most

A source told Deadline that costs are front-loaded because of the large sets built at Warner Bros. Studios Leavesden, which means average budgets for later seasons are likely to drop. The logic is familiar in long-running series. Permanent sets, workshops and production infrastructure are built once and reused, so the heaviest spending falls on the opening season, while later seasons draw on assets that already exist.

If that holds, the headline figures describe the most expensive stage of a seven-season plan rather than a permanent cost level. It also helps explain why a production company’s accounts may look especially heavy in the early period covered by the filings.

Could It Cost More Than the Films?

For comparison, the most expensive of the original films, Harry Potter and the Half-Blood Prince, reportedly cost $250 million, and the eight films together cost roughly $1.2 billion. TheWrap notes the first Harry Potter film reportedly had a $125 million budget. A final season-one cost above $250 million, as Winter Is Coming projects, would surpass the Half-Blood Prince figure.

The comparison has limits. A feature film and a television season are structured differently, and a single season covers a whole book across eight episodes rather than one story in a single release. Still, the contrast shows how far the franchise’s expectations have moved: a single season of television is now being discussed alongside the largest budget in the film series, and against the cost of the first film, the scale is dramatically higher.

Separating Reported Figures From Rumor

HBO has not confirmed a budget. The $100 million per episode figure that has circulated online does not match the filings, which work out to roughly $24.5 million an episode if all spending to date went to season one’s eight episodes. The distinction is worth stating plainly, because a number that spreads quickly on social media can be repeated far beyond its source. Every figure in this report traces back to the UK filings or to the outlets that analyzed them, and each carries the limits described above.

What Comes Next for the Series

Harry Potter and the Philosopher’s Stone premieres on HBO and HBO Max on December 25, and season two is already in production. The series is planned for seven seasons, each adapting one book, and only two seasons are officially greenlit. That structure means the early spending is a wager on future seasons as much as on the first, and the audience response to the Christmas Day launch will shape whether the full plan proceeds.

For the latest on the cast, see our report on the casting of James and Lily Potter and Charlie Weasley.