diff --git a/.github/workflows/cmake.yml b/.github/workflows/cmake.yml
index 6665cdea..feba9c0d 100644
--- a/.github/workflows/cmake.yml
+++ b/.github/workflows/cmake.yml
@@ -13,7 +13,7 @@ jobs:
       # Don't cancel the macOS build if the Linux build fails, etc.
       fail-fast: false
       matrix:
-        os: [ubuntu-18.04, macos-10.15]
+        os: [ubuntu-18.04, macos-10.15, windows-latest]
 
     steps:
     - uses: actions/checkout@v2
@@ -30,3 +30,8 @@ jobs:
       if: runner.os == 'macOS'
       run: |
           ./build-osx.sh
+
+    - name: Windows Build
+      if: runner.os == 'Windows'
+      run: |
+          powershell ./build-windows-64.ps1
diff --git a/build-windows-64.ps1 b/build-windows-64.ps1
new file mode 100644
index 00000000..df5aea5b
--- /dev/null
+++ b/build-windows-64.ps1
@@ -0,0 +1,59 @@
+# for Groff (needed to generate manual)
+# see: https://github.com/actions/virtual-environments/blob/main/images/win/scripts/Installers/Install-Msys2.ps1
+$env:PATH += ";C:\msys64\mingw64\bin;C:\msys64\usr\bin"
+
+# For sha256sum
+$env:Path += ";C:\Program Files\Git\usr\bin"
+
+# Fetch dependencies
+Invoke-WebRequest 'https://github.com/embree/embree/releases/download/v3.12.1/embree-3.12.1.x64.vc14.windows.zip' -OutFile 'embree64.zip'
+7z x embree64.zip -oc:\
+Invoke-WebRequest 'https://github.com/oneapi-src/oneTBB/releases/download/v2020.2/tbb-2020.2-win.zip' -OutFile 'tbb.zip'
+7z x tbb.zip -oc:\
+
+mkdir cmakebuild
+cd cmakebuild
+
+cmake .. -T v142 -Dembree_DIR="C:\embree-3.12.1.x64.vc14.windows" -DTBB_DIR="C:\tbb\cmake" -DCMAKE_GENERATOR_PLATFORM=x64
+
+$cmakePlatform = "x64"
+
+msbuild /target:testlight /p:Configuration=Release /p:Platform=$cmakePlatform ericw-tools.sln
+
+if ( $? -eq $false ) {
+  throw "testlight failed to build"
+}
+
+msbuild /target:testqbsp /p:Configuration=Release /p:Platform=$cmakePlatform ericw-tools.sln
+
+if ( $? -eq $false ) {
+  throw "testqbsp failed to build"
+}
+
+msbuild /p:Configuration=Release /p:Platform=$cmakePlatform PACKAGE.vcxproj
+
+if ( $? -eq $false ) {
+  throw "package failed"
+}
+
+.\light\Release\testlight.exe
+
+if ( $? -eq $false ) {
+  throw "testlight failed"
+}
+
+.\qbsp\Release\testqbsp.exe
+
+if ( $? -eq $false ) {
+  throw "testqbsp failed"
+}
+
+$env:Path += ";$(pwd)\qbsp\Release;$(pwd)\vis\Release;$(pwd)\light\Release"
+
+cd ..\testmaps
+
+. "C:\Program Files\Git\usr\bin\bash.exe" .\automatated_tests.sh
+
+if ( $LastExitCode -ne 0 ) {
+  throw "automatated_tests.sh failed"
+}