diff --git a/build/Modules/Umbraco.Build/Build-UmbracoDocs.ps1 b/build/Modules/Umbraco.Build/Build-UmbracoDocs.ps1
index 2633026f85..25f53c7046 100644
--- a/build/Modules/Umbraco.Build/Build-UmbracoDocs.ps1
+++ b/build/Modules/Umbraco.Build/Build-UmbracoDocs.ps1
@@ -15,40 +15,38 @@ function Build-UmbracoDocs
 
   ################ Do the UI docs
 
-  # create Belle build folder, so that we don't cause a Belle rebuild
-  $belleBuildDir = "$src\Umbraco.Web.UI.Client\build"
-  if (-not (Test-Path $belleBuildDir)) 
+  # No need to build belle again if it exists
+  $belleAppJs = "$src\Umbraco.Web.UI\Umbraco\js\app.js"
+  if(-not (Test-Path $belleAppJs)) 
   {
-      mkdir $belleBuildDir > $null
+	  # get a temp clean node env (will restore)
+	  Sandbox-Node $uenv
+	  
+	  push-location "$($uenv.SolutionRoot)\src\Umbraco.Web.UI.Client"
+	  write "node version is:" > $tmp\belle.log
+	  &node -v >> $tmp\belle.log 2>&1
+	  write "npm version is:" >> $tmp\belle.log 2>&1
+	  &npm -v >> $tmp\belle.log 2>&1
+	  write "cleaning npm cache" >> $tmp\belle.log 2>&1
+	  &npm cache clean >> $tmp\belle.log 2>&1
+	  write "installing bower" >> $tmp\belle.log 2>&1
+	  &npm install -g bower >> $tmp\belle.log 2>&1
+	  write "installing gulp" >> $tmp\belle.log 2>&1
+	  &npm install -g gulp >> $tmp\belle.log 2>&1
+	  write "installing gulp-cli" >> $tmp\belle.log 2>&1
+	  &npm install -g gulp-cli --quiet >> $tmp\belle.log 2>&1
+	  write "executing npm install" >> $tmp\belle.log 2>&1
+	  &npm install >> $tmp\belle.log 2>&1
+	  write "building docs using gulp" >> $tmp\belle.log 2>&1
+	  &gulp docs >> $tmp\belle.log 2>&1
+	  pop-location  
+
+	  # fixme - should we filter the log to find errors?
+	  #get-content .\build.tmp\belle-docs.log | %{ if ($_ -match "build") { write $_}}
+  } else {
+	  Write-Host "Skipping belle build, $belleAppJs already exists"
   }
-
-  Write-Host "Build UI documentation"
-
-  # get a temp clean node env (will restore)
-  Sandbox-Node $uenv
   
-  push-location "$($uenv.SolutionRoot)\src\Umbraco.Web.UI.Client"
-  write "node version is:" > $tmp\belle.log
-  &node -v >> $tmp\belle.log 2>&1
-  write "npm version is:" >> $tmp\belle.log 2>&1
-  &npm -v >> $tmp\belle.log 2>&1
-  write "cleaning npm cache" >> $tmp\belle.log 2>&1
-  &npm cache clean >> $tmp\belle.log 2>&1
-  write "installing bower" >> $tmp\belle.log 2>&1
-  &npm install -g bower >> $tmp\belle.log 2>&1
-  write "installing gulp" >> $tmp\belle.log 2>&1
-  &npm install -g gulp >> $tmp\belle.log 2>&1
-  write "installing gulp-cli" >> $tmp\belle.log 2>&1
-  &npm install -g gulp-cli --quiet >> $tmp\belle.log 2>&1
-  write "executing npm install" >> $tmp\belle.log 2>&1
-  &npm install >> $tmp\belle.log 2>&1
-  write "building docs using gulp" >> $tmp\belle.log 2>&1
-  &gulp docs >> $tmp\belle.log 2>&1
-  pop-location  
-  
-  # fixme - should we filter the log to find errors?
-  #get-content .\build.tmp\belle-docs.log | %{ if ($_ -match "build") { write $_}}
-
   # change baseUrl
   $baseUrl = "https://our.umbraco.org/apidocs/ui/"
   $indexPath = "$src/Umbraco.Web.UI.Client/docs/api/index.html"