In commercial production, price differences usually come from scope, not quality: how many shoot days, how many actors, which usage rights, how many formats. The 5 items below are the skeleton of any serious quote. If they don't appear as separate lines in the quotes you're comparing, you're not comparing prices — you're comparing guesses.
1. Pre-production — where the film is finished on paper
Script, shooting script, storyboard, location scouting, casting, permits. This item looks like a small percentage of the total, but it decides the film's fate: every decision made on set is the invoice for a decision not made on paper. A film that skimps on pre-production is a film whose shoot day runs long.
2. The shoot day — the budget's multiplier
Crew (director, DP, gaffer, sound, AD), equipment (camera, lenses, lighting, grip) and locations are all priced per day. That makes "how many days does this take?" the most powerful budget question: between a plan that wraps in one day and one that spreads across three, the gap can more than double at identical quality. The script decides the day count — go back to item 1.
3. Talent, voiceover and usage rights
An actor's fee is not one number: where and for how long the face and voice will run (TV, digital, international, perpetual) is priced separately. A film agreed today as "social only" produces a surprise invoice the day it goes to TV. Writing the usage scope wide at the start is almost always cheaper than widening it later.
4. Post-production — half the film is made at the desk
Edit, color grade, sound mix, music licensing, graphics and subtitles. The most commonly skipped sub-item is the music license: using a copyrighted track in advertising is a budget line of its own, and "we found it online" is not an option. Post time tracks directly with how disciplined the shoot was — a messy shoot is a long edit.
5. Formats and versions — one film, how many outputs?
One film is no longer one file: the 16:9 master, 9:16 and 1:1 social cuts, 6- and 15-second bumpers, subtitled versions for silent viewing. Planned into the shoot from the start (safe framing for vertical, scenes that survive the cut-down), these outputs are a small additional line; requested afterwards, they mean re-editing. Say which channels you'll run at the quote stage.
If the budget must shrink, shrink it in the right order
Order matters: first the runtime comes down (30 seconds instead of 60), then shoot days and locations, then cast size. The quality items — lighting, color, sound — are discussed last, because that is exactly where an audience smells "cheap". A small budget can make a good film; a careless film has no size that saves it.
To pin down your scope and receive a quote written line by line, get a quote; the whole process is laid out step by step on the commercial production page.