diff --git a/.github/workflows/analysis.yml b/.github/workflows/analysis.yml
index b275ab9b..5bc0407d 100644
--- a/.github/workflows/analysis.yml
+++ b/.github/workflows/analysis.yml
@@ -1,9 +1,12 @@
 name: Code analysis
-on: push
+on: [push, pull_request]
+
 jobs:
+
   run_linters:
     name: Script linters
     runs-on: ubuntu-18.04
+    if: github.event_name != 'pull_request' || contains('dreamer,krcroft,ant-222', github.actor) == false
     steps:
       - uses: actions/checkout@v1
         with:
diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index 03847ca9..a021082e 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -1,11 +1,12 @@
 name: Linux builds
-on: push
+on: [push, pull_request]
 
 jobs:
 
   build_ubuntu:
     name: ${{ matrix.conf.name }}
     runs-on: ${{ matrix.conf.os }}
+    if: github.event_name != 'pull_request' || contains('dreamer,krcroft,ant-222', github.actor) == false
     strategy:
       matrix:
         conf:
@@ -44,6 +45,7 @@ jobs:
   build_linux_release_dynamic:
     name: Release build (dynamic)
     runs-on: ubuntu-16.04
+    if: github.event_name != 'pull_request' || contains('dreamer,krcroft,ant-222', github.actor) == false
     steps:
       - uses: actions/checkout@v1
       - run:  sudo apt-get update
diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index 81a0054d..7d0c5b99 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -1,11 +1,12 @@
 name: macOS builds
-on: push
+on: [push, pull_request]
 
 jobs:
 
   build_macos:
     name: ${{ matrix.conf.name }}
     runs-on: macos-latest
+    if: github.event_name != 'pull_request' || contains('dreamer,krcroft,ant-222', github.actor) == false
     strategy:
       matrix:
         conf:
@@ -33,6 +34,7 @@ jobs:
   build_macos_release:
     name: Release build
     runs-on: macos-latest
+    if: github.event_name != 'pull_request' || contains('dreamer,krcroft,ant-222', github.actor) == false
     steps:
       - uses: actions/checkout@v1
       - name: Install C++ compiler and libraries
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index f71fb289..d41a1901 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -1,11 +1,12 @@
 name: Windows builds
-on: push
+on: [push, pull_request]
 
 jobs:
 
   build_windows_msys2:
     name: ${{ matrix.conf.compiler }} ${{ matrix.conf.bits }}-bit
     runs-on: windows-latest
+    if: github.event_name != 'pull_request' || contains('dreamer,krcroft,ant-222', github.actor) == false
     strategy:
       # Because Clang depends on GCC, we run the Clang-32/64bit jobs
       # first to create combined caches that include both Clang and GCC.
@@ -74,6 +75,7 @@ jobs:
   build_windows_vs:
     name: MSVC 32-bit
     runs-on: windows-latest
+    if: github.event_name != 'pull_request' || contains('dreamer,krcroft,ant-222', github.actor) == false
     strategy:
       matrix:
         type: [Debug]
@@ -100,6 +102,7 @@ jobs:
   build_windows_vs_release:
     name: Release build
     runs-on: windows-latest
+    if: github.event_name != 'pull_request' || contains('dreamer,krcroft,ant-222', github.actor) == false
     steps:
       - uses:  actions/checkout@v1
       - name:  Install packages