diff --git a/commands/env.cmd b/commands/env.cmd
index 2e9d9a16..095478e7 100644
--- a/commands/env.cmd
+++ b/commands/env.cmd
@@ -12,6 +12,12 @@ fi
 ## allow return codes from sub-process to bubble up normally
 trap '' ERR
 
+## define source repository
+if [[ -f "${WARDEN_HOME_DIR}/.env" ]]; then
+  eval "$(cat "${WARDEN_HOME_DIR}/.env" | sed 's/\r$//g' | grep "^WARDEN_")"
+fi
+export WARDEN_SOURCE_REPOSITORY="${WARDEN_SOURCE_REPOSITORY:-"wardenenv"}"
+
 ## configure environment type defaults
 if [[ ${WARDEN_ENV_TYPE} =~ ^magento ]]; then
     export WARDEN_SVC_PHP_VARIANT=-${WARDEN_ENV_TYPE}
diff --git a/environments/includes/blackfire.base.yml b/environments/includes/blackfire.base.yml
index 097946e0..9966bf88 100644
--- a/environments/includes/blackfire.base.yml
+++ b/environments/includes/blackfire.base.yml
@@ -12,7 +12,7 @@ x-extra_hosts: &extra_hosts
 services:
   php-blackfire:
     hostname: "${WARDEN_ENV_NAME}-php-blackfire"
-    image: docker.io/wardenenv/php-fpm:${PHP_VERSION:-7.4}${WARDEN_SVC_PHP_VARIANT:-}-blackfire
+    image: ${WARDEN_SOURCE_REPOSITORY:-wardenenv}/php-fpm:${PHP_VERSION:-7.4}${WARDEN_SVC_PHP_VARIANT:-}-blackfire
     environment:
       - TRAEFIK_DOMAIN
       - TRAEFIK_SUBDOMAIN
diff --git a/environments/includes/db.base.yml b/environments/includes/db.base.yml
index 48acad70..09b4f4e7 100644
--- a/environments/includes/db.base.yml
+++ b/environments/includes/db.base.yml
@@ -6,7 +6,7 @@ services:
 
   db:
     hostname: "${WARDEN_ENV_NAME}-mariadb"
-    image: docker.io/wardenenv/mariadb:${MARIADB_VERSION:-10.4}
+    image: ${WARDEN_SOURCE_REPOSITORY:-wardenenv}/mariadb:${MARIADB_VERSION:-10.4}
     environment:
       - MYSQL_ROOT_PASSWORD=${MYSQL_ROOT_PASSWORD:-app}
       - MYSQL_DATABASE=${MYSQL_DATABASE:-app}
diff --git a/environments/includes/elasticsearch.base.yml b/environments/includes/elasticsearch.base.yml
index cf502240..3e3f670a 100644
--- a/environments/includes/elasticsearch.base.yml
+++ b/environments/includes/elasticsearch.base.yml
@@ -2,7 +2,7 @@ version: "3.5"
 services:
   elasticsearch:
     hostname: "${WARDEN_ENV_NAME}-elasticsearch"
-    image: docker.io/wardenenv/elasticsearch:${ELASTICSEARCH_VERSION:-7.8}
+    image: ${WARDEN_SOURCE_REPOSITORY:-wardenenv}/elasticsearch:${ELASTICSEARCH_VERSION:-7.8}
     labels:
       - traefik.enable=true
       - traefik.http.routers.${WARDEN_ENV_NAME}-elasticsearch.tls=true
diff --git a/environments/includes/nginx.base.yml b/environments/includes/nginx.base.yml
index 13715ec8..93a5576c 100644
--- a/environments/includes/nginx.base.yml
+++ b/environments/includes/nginx.base.yml
@@ -2,7 +2,7 @@ version: "3.5"
 services:
   nginx:
     hostname: "${WARDEN_ENV_NAME}-nginx"
-    image: docker.io/wardenenv/nginx:${NGINX_VERSION:-1.16}
+    image: ${WARDEN_SOURCE_REPOSITORY:-wardenenv}/nginx:${NGINX_VERSION:-1.16}
     labels:
       - traefik.enable=true
       - traefik.http.routers.${WARDEN_ENV_NAME}-nginx.tls=true
diff --git a/environments/includes/php-fpm.base.yml b/environments/includes/php-fpm.base.yml
index 8797b632..16c5b01d 100644
--- a/environments/includes/php-fpm.base.yml
+++ b/environments/includes/php-fpm.base.yml
@@ -17,7 +17,7 @@ services:
 
   php-fpm:
     hostname: "${WARDEN_ENV_NAME}-php-fpm"
-    image: docker.io/wardenenv/php-fpm:${PHP_VERSION:-7.4}${WARDEN_SVC_PHP_VARIANT:-}
+    image: ${WARDEN_SOURCE_REPOSITORY:-wardenenv}/php-fpm:${PHP_VERSION:-7.4}${WARDEN_SVC_PHP_VARIANT:-}
     environment:
       - TRAEFIK_DOMAIN
       - TRAEFIK_SUBDOMAIN
@@ -32,7 +32,7 @@ services:
 
   php-debug:
     hostname: "${WARDEN_ENV_NAME}-php-debug"
-    image: docker.io/wardenenv/php-fpm:${PHP_VERSION:-7.4}${WARDEN_SVC_PHP_VARIANT:-}-${XDEBUG_VERSION:-debug}
+    image: ${WARDEN_SOURCE_REPOSITORY:-wardenenv}/php-fpm:${PHP_VERSION:-7.4}${WARDEN_SVC_PHP_VARIANT:-}-${XDEBUG_VERSION:-debug}
     environment:
       - TRAEFIK_DOMAIN
       - TRAEFIK_SUBDOMAIN
diff --git a/environments/includes/rabbitmq.base.yml b/environments/includes/rabbitmq.base.yml
index 3d488c20..154969dc 100644
--- a/environments/includes/rabbitmq.base.yml
+++ b/environments/includes/rabbitmq.base.yml
@@ -2,7 +2,7 @@ version: "3.5"
 services:
   rabbitmq:
     hostname: "${WARDEN_ENV_NAME}-rabbitmq"
-    image: docker.io/wardenenv/rabbitmq:${RABBITMQ_VERSION:-3.8}
+    image: ${WARDEN_SOURCE_REPOSITORY:-wardenenv}/rabbitmq:${RABBITMQ_VERSION:-3.8}
     labels:
       - traefik.enable=true
       - traefik.http.routers.${WARDEN_ENV_NAME}-rabbitmq.tls=true
diff --git a/environments/includes/redis.base.yml b/environments/includes/redis.base.yml
index 8ccc87ca..7401689f 100644
--- a/environments/includes/redis.base.yml
+++ b/environments/includes/redis.base.yml
@@ -2,7 +2,7 @@ version: "3.5"
 services:
   redis:
     hostname: "${WARDEN_ENV_NAME}-redis"
-    image: docker.io/wardenenv/redis:${REDIS_VERSION:-5.0}
+    image: ${WARDEN_SOURCE_REPOSITORY:-wardenenv}/redis:${REDIS_VERSION:-5.0}
     volumes:
       - redis:/data
 
diff --git a/environments/includes/varnish.base.yml b/environments/includes/varnish.base.yml
index e2f0762d..b1748fc2 100644
--- a/environments/includes/varnish.base.yml
+++ b/environments/includes/varnish.base.yml
@@ -7,7 +7,7 @@ services:
 
   varnish:
     hostname: "${WARDEN_ENV_NAME}-varnish"
-    image: docker.io/wardenenv/varnish:${VARNISH_VERSION:-6.0}
+    image: ${WARDEN_SOURCE_REPOSITORY:-wardenenv}/varnish:${VARNISH_VERSION:-6.0}
     depends_on:
       - nginx
     labels:
diff --git a/environments/magento2/magento2.magepack.base.yml b/environments/magento2/magento2.magepack.base.yml
index fb77e16d..73c5a3e9 100644
--- a/environments/magento2/magento2.magepack.base.yml
+++ b/environments/magento2/magento2.magepack.base.yml
@@ -2,7 +2,7 @@ version: "3.5"
 services:
   magepack:
     hostname: "${WARDEN_ENV_NAME}-magepack"
-    image: docker.io/wardenenv/magepack:${MAGEPACK_VERSION:-2.3}
+    image: ${WARDEN_SOURCE_REPOSITORY:-wardenenv}/magepack:${MAGEPACK_VERSION:-2.3}
     environment:
       - TRAEFIK_DOMAIN
       - TRAEFIK_SUBDOMAIN
diff --git a/environments/magento2/magento2.splitdb.checkout.base.yml b/environments/magento2/magento2.splitdb.checkout.base.yml
index 25fbee01..129a2251 100644
--- a/environments/magento2/magento2.splitdb.checkout.base.yml
+++ b/environments/magento2/magento2.splitdb.checkout.base.yml
@@ -10,7 +10,7 @@ services:
 
   checkoutdb:
     hostname: "${WARDEN_ENV_NAME}-checkoutdb"
-    image: docker.io/wardenenv/mariadb:${MARIADB_VERSION:-10.4}
+    image: ${WARDEN_SOURCE_REPOSITORY:-wardenenv}/mariadb:${MARIADB_VERSION:-10.4}
     environment:
       - MYSQL_ROOT_PASSWORD=${MYSQL_ROOT_PASSWORD:-magento}
       - MYSQL_DATABASE=${MYSQL_DATABASE:-magento}
diff --git a/environments/magento2/magento2.splitdb.sales.base.yml b/environments/magento2/magento2.splitdb.sales.base.yml
index 2c03bc21..b0ed5373 100644
--- a/environments/magento2/magento2.splitdb.sales.base.yml
+++ b/environments/magento2/magento2.splitdb.sales.base.yml
@@ -10,7 +10,7 @@ services:
 
   salesdb:
     hostname: "${WARDEN_ENV_NAME}-salesdb"
-    image: docker.io/wardenenv/mariadb:${MARIADB_VERSION:-10.4}
+    image: ${WARDEN_SOURCE_REPOSITORY:-wardenenv}/mariadb:${MARIADB_VERSION:-10.4}
     environment:
       - MYSQL_ROOT_PASSWORD=${MYSQL_ROOT_PASSWORD:-magento}
       - MYSQL_DATABASE=${MYSQL_DATABASE:-magento}
diff --git a/environments/magento2/magento2.tests.base.yml b/environments/magento2/magento2.tests.base.yml
index 32c5125d..6ea96b46 100644
--- a/environments/magento2/magento2.tests.base.yml
+++ b/environments/magento2/magento2.tests.base.yml
@@ -2,7 +2,7 @@ version: "3.5"
 services:
   tmp-mysql:
     hostname: "${WARDEN_ENV_NAME}-mysql"
-    image: docker.io/wardenenv/mysql:5.7
+    image: ${WARDEN_SOURCE_REPOSITORY:-wardenenv}/mysql:5.7
     environment:
       - MYSQL_ROOT_PASSWORD=${MYSQL_ROOT_PASSWORD:-magento}
       - MYSQL_DATABASE=magento_integration_tests
diff --git a/images/php-fpm/Dockerfile b/images/php-fpm/Dockerfile
index 5b3ede13..a7b7cf9d 100644
--- a/images/php-fpm/Dockerfile
+++ b/images/php-fpm/Dockerfile
@@ -1,6 +1,7 @@
-ARG PHP_VERSION=
+ARG PHP_SOURCE_IMAGE="davidalger/php"
+ARG PHP_VERSION
 ARG PHP_VARIANT="fpm-loaders"
-FROM davidalger/php:${PHP_VERSION}-${PHP_VARIANT}
+FROM ${PHP_SOURCE_IMAGE}:${PHP_VERSION}-${PHP_VARIANT}
 
 # Clear undesired settings from base fpm images
 ENV COMPOSER_ALLOW_SUPERUSER=
diff --git a/images/php-fpm/blackfire/Dockerfile b/images/php-fpm/blackfire/Dockerfile
index 20a499a4..a67bb253 100644
--- a/images/php-fpm/blackfire/Dockerfile
+++ b/images/php-fpm/blackfire/Dockerfile
@@ -1,5 +1,6 @@
-ARG PHP_VERSION=
-FROM docker.io/wardenenv/php-fpm:${PHP_VERSION}
+ARG ENV_SOURCE_IMAGE="wardenenv/php-fpm"
+ARG PHP_VERSION
+FROM ${ENV_SOURCE_IMAGE}:${PHP_VERSION}
 USER root
 
 RUN curl -o - "http://packages.blackfire.io/fedora/blackfire.repo" \
diff --git a/images/php-fpm/debug/Dockerfile b/images/php-fpm/debug/Dockerfile
index 580c65d6..c64e144d 100644
--- a/images/php-fpm/debug/Dockerfile
+++ b/images/php-fpm/debug/Dockerfile
@@ -1,5 +1,6 @@
-ARG PHP_VERSION=
-FROM docker.io/wardenenv/php-fpm:${PHP_VERSION}
+ARG ENV_SOURCE_IMAGE="wardenenv/php-fpm"
+ARG PHP_VERSION
+FROM ${ENV_SOURCE_IMAGE}:${PHP_VERSION}
 USER root
 
 RUN set -eux \
diff --git a/images/php-fpm/magento1/Dockerfile b/images/php-fpm/magento1/Dockerfile
index 518370fa..d24d99f4 100644
--- a/images/php-fpm/magento1/Dockerfile
+++ b/images/php-fpm/magento1/Dockerfile
@@ -1,5 +1,6 @@
+ARG ENV_SOURCE_IMAGE="wardenenv/php-fpm"
 ARG PHP_VERSION
-FROM docker.io/wardenenv/php-fpm:${PHP_VERSION}
+FROM ${ENV_SOURCE_IMAGE}:${PHP_VERSION}
 USER root
 
 RUN npm install -g grunt-cli gulp yarn
diff --git a/images/php-fpm/magento1/blackfire/Dockerfile b/images/php-fpm/magento1/blackfire/Dockerfile
index 31a0d7ea..e0530b07 100644
--- a/images/php-fpm/magento1/blackfire/Dockerfile
+++ b/images/php-fpm/magento1/blackfire/Dockerfile
@@ -1,5 +1,6 @@
+ARG ENV_SOURCE_IMAGE="wardenenv/php-fpm"
 ARG PHP_VERSION
-FROM docker.io/wardenenv/php-fpm:${PHP_VERSION}-magento1
+FROM ${ENV_SOURCE_IMAGE}:${PHP_VERSION}-magento1
 USER root
 
 RUN curl -o - "http://packages.blackfire.io/fedora/blackfire.repo" \
diff --git a/images/php-fpm/magento1/debug/Dockerfile b/images/php-fpm/magento1/debug/Dockerfile
index be0d1dd4..ba71ddf3 100644
--- a/images/php-fpm/magento1/debug/Dockerfile
+++ b/images/php-fpm/magento1/debug/Dockerfile
@@ -1,5 +1,6 @@
+ARG ENV_SOURCE_IMAGE="wardenenv/php-fpm"
 ARG PHP_VERSION
-FROM docker.io/wardenenv/php-fpm:${PHP_VERSION}-magento1
+FROM ${ENV_SOURCE_IMAGE}:${PHP_VERSION}-magento1
 USER root
 
 RUN set -eux \
diff --git a/images/php-fpm/magento1/xdebug3/Dockerfile b/images/php-fpm/magento1/xdebug3/Dockerfile
index 271092bc..c08d4d12 100644
--- a/images/php-fpm/magento1/xdebug3/Dockerfile
+++ b/images/php-fpm/magento1/xdebug3/Dockerfile
@@ -1,5 +1,6 @@
-ARG PHP_VERSION=
-FROM docker.io/wardenenv/php-fpm:${PHP_VERSION}-magento1
+ARG ENV_SOURCE_IMAGE="wardenenv/php-fpm"
+ARG PHP_VERSION
+FROM ${ENV_SOURCE_IMAGE}:${PHP_VERSION}-magento1
 USER root
 
 RUN set -eux \
diff --git a/images/php-fpm/magento2/Dockerfile b/images/php-fpm/magento2/Dockerfile
index afc89459..5fba6812 100644
--- a/images/php-fpm/magento2/Dockerfile
+++ b/images/php-fpm/magento2/Dockerfile
@@ -1,5 +1,6 @@
+ARG ENV_SOURCE_IMAGE="wardenenv/php-fpm"
 ARG PHP_VERSION
-FROM docker.io/wardenenv/php-fpm:${PHP_VERSION}
+FROM ${ENV_SOURCE_IMAGE}:${PHP_VERSION}
 USER root
 
 RUN npm install -g grunt-cli gulp yarn
diff --git a/images/php-fpm/magento2/blackfire/Dockerfile b/images/php-fpm/magento2/blackfire/Dockerfile
index e2ee4918..59cbcfad 100644
--- a/images/php-fpm/magento2/blackfire/Dockerfile
+++ b/images/php-fpm/magento2/blackfire/Dockerfile
@@ -1,5 +1,6 @@
+ARG ENV_SOURCE_IMAGE="wardenenv/php-fpm"
 ARG PHP_VERSION
-FROM docker.io/wardenenv/php-fpm:${PHP_VERSION}-magento2
+FROM ${ENV_SOURCE_IMAGE}:${PHP_VERSION}-magento2
 USER root
 
 RUN curl -o - "http://packages.blackfire.io/fedora/blackfire.repo" \
diff --git a/images/php-fpm/magento2/debug/Dockerfile b/images/php-fpm/magento2/debug/Dockerfile
index 5c04277f..70d38c68 100644
--- a/images/php-fpm/magento2/debug/Dockerfile
+++ b/images/php-fpm/magento2/debug/Dockerfile
@@ -1,5 +1,6 @@
+ARG ENV_SOURCE_IMAGE="wardenenv/php-fpm"
 ARG PHP_VERSION
-FROM docker.io/wardenenv/php-fpm:${PHP_VERSION}-magento2
+FROM ${ENV_SOURCE_IMAGE}:${PHP_VERSION}-magento2
 USER root
 
 RUN set -eux \
diff --git a/images/php-fpm/magento2/xdebug3/Dockerfile b/images/php-fpm/magento2/xdebug3/Dockerfile
index ac191097..62442448 100644
--- a/images/php-fpm/magento2/xdebug3/Dockerfile
+++ b/images/php-fpm/magento2/xdebug3/Dockerfile
@@ -1,5 +1,6 @@
-ARG PHP_VERSION=
-FROM docker.io/wardenenv/php-fpm:${PHP_VERSION}-magento2
+ARG ENV_SOURCE_IMAGE="wardenenv/php-fpm"
+ARG PHP_VERSION
+FROM ${ENV_SOURCE_IMAGE}:${PHP_VERSION}-magento2
 USER root
 
 RUN set -eux \
diff --git a/images/php-fpm/xdebug3/Dockerfile b/images/php-fpm/xdebug3/Dockerfile
index 03622534..17b10350 100644
--- a/images/php-fpm/xdebug3/Dockerfile
+++ b/images/php-fpm/xdebug3/Dockerfile
@@ -1,5 +1,6 @@
-ARG PHP_VERSION=
-FROM docker.io/wardenenv/php-fpm:${PHP_VERSION}
+ARG ENV_SOURCE_IMAGE="wardenenv/php-fpm"
+ARG PHP_VERSION
+FROM ${ENV_SOURCE_IMAGE}:${PHP_VERSION}
 USER root
 
 RUN set -eux \
diff --git a/images/scripts/build.sh b/images/scripts/build.sh
index f93da4de..25917aba 100755
--- a/images/scripts/build.sh
+++ b/images/scripts/build.sh
@@ -43,10 +43,14 @@ if [[ ${PUSH_FLAG} ]]; then
   fi
 fi
 
+## define image repository to push
+WARDEN_SOURCE_REPOSITORY="${WARDEN_SOURCE_REPOSITORY:-"wardenenv"}"
+
 ## iterate over and build each Dockerfile
 for file in $(find ${SEARCH_PATH} -type f -name Dockerfile | sort -V); do
     BUILD_DIR="$(dirname "${file}")"
-    IMAGE_TAG="docker.io/wardenenv/$(echo "${BUILD_DIR}" | cut -d/ -f1)"
+    IMAGE_TAG=${WARDEN_SOURCE_REPOSITORY}
+    IMAGE_TAG+="/$(echo "${BUILD_DIR}" | cut -d/ -f1)"
     IMAGE_SUFFIX="$(echo "${BUILD_DIR}" | cut -d/ -f2- -s | tr / - | sed 's/^-//')"
 
     ## due to build matrix requirements, magento1 and magento2 specific varients are built in separate invocation
@@ -62,6 +66,15 @@ for file in $(find ${SEARCH_PATH} -type f -name Dockerfile | sort -V); do
         fatal "Building ${SEARCH_PATH} images requires PHP_VERSION env variable be set."
       fi
 
+      ## define default sources for main php and environment images
+      export PHP_SOURCE_IMAGE="${PHP_SOURCE_IMAGE:-"davidalger/php"}"
+      BUILD_ARGS+=("--build-arg")
+      BUILD_ARGS+=("PHP_SOURCE_IMAGE")
+
+      export ENV_SOURCE_IMAGE="${ENV_SOURCE_IMAGE:-"wardenenv/php-fpm"}"
+      BUILD_ARGS+=("--build-arg")
+      BUILD_ARGS+=("ENV_SOURCE_IMAGE")
+
       export PHP_VERSION
 
       IMAGE_TAG+=":${PHP_VERSION}"