# EC2 Image Builder can now use Auto Scaling Group instances

> AWS adds an optional feature that lets Image Builder pick already‑running EC2 instances from an Auto Scaling Group, cutting build time.

Oossa · 2026-10-19 · https://oossa.com/en/ec2-image-builder-can-now-use-auto-scaling-group-instances

AWS announced that EC2 Image Builder can now pull instances from an existing Auto Scaling Group (ASG) when creating machine images. Instead of launching a fresh instance for each build, the service reuses a running instance, applies the build steps, and produces the image. The ASG automatically refills the pool so the next build also has a ready instance. This option is fully opt‑in and does not change any pipelines that don’t use it. The feature is live in every AWS region and carries no extra charge.

## The facts

- Feature announced on 2026-10-19
- Works in all AWS Regions at no additional cost

## Why it matters

Developers can shorten their image‑building pipelines, saving minutes per build and reducing compute costs.

## Sources & references

1. [EC2 Image Builder now integrates with ASG for faster image builds](https://aws.amazon.com/about-aws/whats-new/2026/10/ec2-image-builder-asg-faster-builds/) – AWS, 2026-10-19

Last updated: 2026-10-19