As has been stated many times in different threads, the budget was comparable to other drama series like "Mission Impossible" and "Bonanza". The issue was that those other shows could rent ready made props, costumes and set pieces whereas Trek had to build many items from scratch that otherwise didn't exist with those same funds.
The trouble with comparing budgets between different studios is that each uses different bookkeeping methods.
Trek got charged to its budget a lot of things that weren't line items in series budgets over at Fox, like meals. So it's really impossible to draw anything like a 1:1 comparison. That said, at Desilu/Paramount the studio spent more on shows like
Mission: Impossible and
Mannix, but both of those were for CBS, which loved Lucy and thus probably got higher network licensing fees. Even with that caveat,
Star Trek's budget seems to have been decent for a primetime show, but Desilu was a pretty rinky-dink operation compared to Fox and didn't have as extensive a scene dock of elements which could be cheaply repurposed.
As
@Harvey has said many times, NBC's licensing fee went up every season, but Star Trek's fixed costs, notably cast salaries, went up every year, eating up some of that increase, and the studio cut the budget back every year to try to ameliorate their deficit financing. This led to the 3rd season situation re the "radio show" budget.
Ellison's original concept had a ruined city with rows of sentient speaking statues. Bob Justman did not like the probable cost.
Not your fault that this popularly repeated story is not actually correct. They never went to the city and there were never any statues, just annnnnncient men. To wit:
From the 1966-5-13 treatment (
emphasis mine):
[...]They strike out toward the source of the radiation and in the far distance see a series of great mountains peaks, rising up like shards of glass from an ocean of silver. They get a distant impression of a great city on the furthest of those peaks, a series of spires that tower into the cadaverous grey skies without warmth or welcome.
[...]Soon they find themselves on a mountain top near the city. As they top a rise [...] they are astonished to see a group of men...but such men as the explorers from Earth have never know:[...]
The Ellison script drafts all conform to this, except that after the 1st draft the Guardians plural become a Guardian singular, and then a disembodied voice coming, as per the final episode.
[...]Additionally, the average episode budget is also whittled down via amortization of larger reused sets (e.g. the Bridge set cost $x,xxx,xxx to build so they took a bit of that out of each produced episode.
A good point. However as the bridge and the transporter were built for the very expensive pilots with their much higher fees from NBC, the other standing sets are probably a better example of costs which could be amortized over the course of a season. In the Roddenberry letter to Paramount re the show's costs he suggests they can make better use of their budget if they can do more shipboard episodes and urges the studio to fight for that with NBC (which constantly pressed
Trek to deliver on its promised "strange new worlds" format). Sadly, there's not a document trail we're aware of to support if Paramount did this (and I've never done a breakdown of the average number of bottle shows per season to test this idea).
[...]
Trek was the most expensive show pilot of the time, which is also a reason why they did the then-unprecedented step of making a second pilot...
Well.... according to
Trek people, anyway. There's some evidence that the "No Place to Hide" pilot for
Lost In Space might've been even more expensive than "The Cage" (see previous caveats about comparing budgets between studios). As to the "unprecedented" claim re the 2nd pilot
@Harvey pretty thoroughly debunked this on his
Star Trek Fact Check blog (link).