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# Feature: Opt-out of On-demand Concurrent Builds for specific deploys

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Gianfranco P (@gianpaj) · 2025-11-29

I have a Next.js app deployed on Vercel, and I’m using GitHub automatic builds.

Could you add a way for certain preview builds to avoid using the On-demand concurrent build servers and instead use cheaper servers?

I believe many others also have bots that upgrade dependencies or perform other non-time-critical tasks.

![image|690x389](upload://aGuLC3jYH4Ur4TD0SL8leBRMoDT.png)

Maybe similar to the `ignoreCommand` option in `vercel.json` , so  we can customize to our liking when to `onDemandBuildCommand` (or similar)

```json
{
  "$schema": "https://openapi.vercel.sh/vercel.json",
  "onDemandBuildCommand": "git log -1 --pretty=format:%ae | grep -E 'john@gmail.com|users.noreply.github.com' && exit 0 || exit 1"
}
```

https://vercel.com/docs/project-configuration#ignorecommand

Thanks