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Set up Development Environment

You'll need to set up a development environment if you want to develop a new feature or component for Home Assistant. Read on to learn how to set up.

Developing with Visual Studio Code + devcontainer#

The easiest way to get started with development is to use Visual Studio Code with devcontainers. This approach will create a preconfigured development environment with all the tools you need. This approach is enabled for all Home Assistant repositories.


More info about requirements and devcontainer in general

Getting started:

  1. Fork the Home Assistant core repository.
  2. Clone the repository to your computer. Windows users need to place their files within WSL file system to prevent performance degradation.
  3. Open the repository using Visual Studio code.

When you open this repository with Visual Studio code you are asked to "Reopen in Container", this will start the build of the container.


The devcontainer comes with some useful tasks to help you with development, you can start these tasks by opening the command palette and select Tasks: Run Task then select the task you want to run.

When a task is currently running (like Preview for the docs), it can be restarted by opening the command palette and selecting Tasks: Restart Running Task, then select the task you want to restart.

Manual Environment#

It is also possible to set up a more traditional development environment. See the section for your operating system. Make sure your Python version is 3.8 or later.

Developing on Linux#

Install the core dependencies.

sudo apt-get install python3-pip python3-dev python3-venv autoconf libssl-dev libxml2-dev libxslt1-dev libjpeg-dev libffi-dev libudev-dev zlib1g-dev pkg-config libavformat-dev libavcodec-dev libavdevice-dev libavutil-dev libswscale-dev libavresample-dev libavfilter-dev ffmpeg

Developing on Windows#

To develop on Windows, you will need to use the Linux subsystem (WSL). Follow the WSL installation instructions and install Ubuntu from the Windows Store. Once you're able to access Linux, follow the Linux instructions.


If you find that you cannot open the development instance via http://localhost:8123 when using WSL, instead, within a WSL terminal, find the inet address of the eth0 adaptor by running ip addr show eth0. Then use this address, excluding the CIDR block, to access the development instance, i.e. if your inet is listed as, use

Freshly installed WSL distribution#

The first time a WSL distribution is started, and the default WSL user account is created, the Windows drives will still be mounted with all files owned by root:root instead of owned by the default user, i.e. with uid=0,gid=0 included in the mount options as shown by:

[email protected]:/mnt/c/Users/user$ mount | grep mntC:\ on /mnt/c type drvfs (rw,noatime,uid=0,gid=0,case=off)

This will cause the setup script to fail with an unrelated error if the local repository is on a Windows drive. To recover, WSL must be restarted after which the Windows drives will be mounted with all files owned by the default WSL user. This can be accomplished by simply restarting the computer, or by issuing the following command from a windows command prompt:

wsl --shutdown

After WSL is restarted, the mount's uid and gid will match the default user.

Developing on macOS#

Install Homebrew, then use that to install the dependencies:

brew install python3 autoconf ffmpeg

Setup Local Repository#

Visit the Home Assistant Core repository and click Fork. Once forked, setup your local copy of the source using the commands:

git clone coregit remote add upstream

Install the requirements with a provided script named setup.


This will create a virtual environment and install all necessary requirements. You're now set!

Each time you start a new terminal session, you will need to activate your virtual environment:

source venv/bin/activate

After that you can run Home Assistant like this:

hass -c config

The Home Assistant configuration is stored in the config directory in your repository.