---
layout: docs
sidebar_current: docs-builders-custom
page_title: Custom - Builders
description: |-
  Packer is extensible, allowing you to write new builders without having to
  modify the core source code of Packer itself. Documentation for creating new
  builders is covered in the custom builders page of the Packer plugin section.
---

# Custom Builder

Packer is extensible, allowing you to write new builders without having to
modify the core source code of Packer itself. Documentation for creating new
builders is covered in the [custom builders](/docs/extending/custom-builders.html) page of
the Packer plugin section.