diff --git a/BuildHelpers/Public/Get-BuildEnvironment.ps1 b/BuildHelpers/Public/Get-BuildEnvironment.ps1
index c7ad119..770f642 100644
--- a/BuildHelpers/Public/Get-BuildEnvironment.ps1
+++ b/BuildHelpers/Public/Get-BuildEnvironment.ps1
@@ -15,6 +15,7 @@ function Get-BuildEnvironment {
             CommitMessage    via Get-BuildVariable
             CommitHash       via Get-BuildVariable
             BuildNumber      via Get-BuildVariable
+            IsPullRequest    via Get-BuildVariable
             ProjectName      via Get-ProjectName
             PSModuleManifest via Get-PSModuleManifest
             ModulePath       via Split-Path on PSModuleManifest
@@ -107,6 +108,11 @@ function Get-BuildEnvironment {
         PSModuleManifest = ${Build.ManifestPath}
         ModulePath = ${Build.ModulePath}
     }
+    if (${Build.Vars}.IsPullRequest) {
+        #This will ensure IsPullRequest is inserted into the ordered table after the BuildNumber property
+        $index = $($BuildHelpersVariables.keys).IndexOf("BuildNumber")
+        $BuildHelpersVariables.Insert($index+1,"IsPullRequest",${Build.Vars}.IsPullRequest)
+    }
     foreach($VarName in $BuildHelpersVariables.keys){
         $BuildOutput = $BuildOutput -replace "\`$$VarName", $BuildHelpersVariables[$VarName]
     }
diff --git a/BuildHelpers/Public/Get-BuildVariable.ps1 b/BuildHelpers/Public/Get-BuildVariable.ps1
index 3ffb8c6..bbf862f 100644
--- a/BuildHelpers/Public/Get-BuildVariable.ps1
+++ b/BuildHelpers/Public/Get-BuildVariable.ps1
@@ -35,6 +35,7 @@ function Get-BuildVariable {
                 BranchName: git branch for this build
                 CommitMessage: git commit message for this build
                 BuildNumber: Build number provided by the CI system
+                IsPullRequest: "True" if CI says the current build is the result of a PR, otherwise this value will not be present
 
     .PARAMETER Path
         Path to project root. Defaults to the current working path
@@ -263,7 +264,20 @@ function Get-BuildVariable {
         $BuildNumber = 0
     }
 
-    [pscustomobject]@{
+    $PullRequest = switch ($BuildSystem)
+    {
+        'AppVeyor'        {if ($Environment.APPVEYOR_PULL_REQUEST_NUMBER) {"True"}; break}
+        'GitLab CI'       {if ($Environment.CI_MERGE_REQUEST_ID) {"True"}; break}
+        'Azure Pipelines' {if ($ENV:BUILD_REASON -eq "PullRequest") {"True"}; break}
+        'Bamboo'          {if ($Environment.bamboo.repository.pr.key) {"True"}; break}
+        'GoCD'            {if ($Environment.PR_TITLE) {"True"}; break}
+        'Travis CI'       {if ($ENV:TRAVIS_EVENT_TYPE -eq "pull_request") {"True"}; break}
+        'GitHub Actions'  {if ($ENV:GITHUB_EVENT_NAME -eq "pull_request") {"True"}; break}
+        #'Jenkins' {if ($Environment.CHANGE_ID) {"True"}} ???? is this correct?
+        #'Teamcity' {if ???????) {"True"}} who even knows
+    }
+
+    $ReturnHash = @{
         BuildSystem = $BuildSystem
         ProjectPath = $BuildRoot
         BranchName = $BuildBranch
@@ -271,4 +285,10 @@ function Get-BuildVariable {
         CommitHash = $CommitHash
         BuildNumber = $BuildNumber
     }
+    if ($PullRequest) {
+        $ReturnHash['IsPullRequest'] = $PullRequest
+    }
+
+    [PSCustomObject]$ReturnHash
+
 }
diff --git a/BuildHelpers/Scripts/Set-BuildVariable.ps1 b/BuildHelpers/Scripts/Set-BuildVariable.ps1
index 387a7b1..7bd962c 100644
--- a/BuildHelpers/Scripts/Set-BuildVariable.ps1
+++ b/BuildHelpers/Scripts/Set-BuildVariable.ps1
@@ -12,7 +12,9 @@
         BHProjectPath      via Get-BuildVariable
         BHBranchName       via Get-BuildVariable
         BHCommitMessage    via Get-BuildVariable
+        BHCommitHash       via Get-BuildVariable
         BHBuildNumber      via Get-BuildVariable
+        BHIsPullRequest    via Get-BuildVariable
         BHProjectName      via Get-ProjectName
         BHPSModuleManifest via Get-PSModuleManifest
         BHModulePath     via Split-Path on BHPSModuleManifest
@@ -111,11 +113,15 @@ $BuildHelpersVariables = @{
     ProjectPath = ${Build.Vars}.ProjectPath
     BranchName  = ${Build.Vars}.BranchName
     CommitMessage = ${Build.Vars}.CommitMessage
+    CommitHash = ${Build.Vars}.CommitHash
     BuildNumber = ${Build.Vars}.BuildNumber
     ProjectName = ${Build.ProjectName}
     PSModuleManifest = ${Build.ManifestPath}
     ModulePath = $(Split-Path -Path ${Build.ManifestPath} -Parent)
 }
+if (${Build.Vars}.IsPullRequest) {
+    $BuildHelpersVariables.IsPullRequest = [bool]${Build.Vars}.IsPullRequest
+}
 foreach ($VarName in $BuildHelpersVariables.Keys) {
     Set-Variable -Scope $Scope -Name ('{0}{1}' -f $VariableNamePrefix,$VarName) -Value $BuildHelpersVariables[$VarName]
 }