David Senra

By building 80% of its hardware internally, engines, structures, avionics, software, and key ground systems, SpaceX collapsed the traditional aerospace stack.

They outsource raw materials and commodity parts and make everything else themselves.

That's something SpaceX didn't originally set out to do, one engineer noted, but was driven by suppliers' high prices.

This wasn't an ideological commitment to doing everything in-house.

It was the result of suppliers repeatedly quoting prices and timelines incompatible with SpaceX's cost targets.

The benefits compound.

When several tiers each add 15% margin, total cost multiplies through the layers.

A NASA study found SpaceX developed Falcon 9 for roughly $440 million.

They estimated the same work with traditional contractors would have cost 3 to 10 times that amount.

Vertical integration also accelerates iteration.

Another great line.

Vertical integration also accelerates iteration.

When an engineer needs to change a bracket, weld, or circuit board, the manufacturing engineer is in the same building using the same CAD systems and tooling.

Materials, jigs, and processes can evolve together on the scale of weeks, enabling a rapid progression from Falcon 1 to successive Falcon 9 variants, each iteration improving performance and reducing cost

without waiting for suppliers to retool on multi-year cycles.

But vertical integration creates a new problem.

It concentrates fixed costs.

If you own the factory, the machines, and the staff, you're losing money every second they aren't building something.

At the traditional launch cadence of two to four vehicles per year, in-house manufacturing is a liability, not an advantage.

To make the math work, you need volume.