diff --git a/Makefile b/Makefile
index b5bedf79c..b44aa8b91 100644
--- a/Makefile
+++ b/Makefile
@@ -108,6 +108,11 @@ build-with-docker: prepare-docker-build-image ## Build inside a Docker container
 		-e GIT_COMMIT=${GIT_COMMIT} \
 		-e BUILD_NUMBER=${BUILD_NUMBER} \
 		-e BUILD_URL=${BUILD_URL} \
+		-e http_proxy="${HTTP_PROXY}" \
+		-e HTTP_PROXY="${HTTP_PROXY}" \
+		-e https_proxy="${HTTPS_PROXY}" \
+		-e HTTPS_PROXY="${HTTPS_PROXY}" \
+		-e NO_PROXY="${NO_PROXY}" \
 		${DOCKER_BUILDER_IMAGE_NAME} \
 		make build
 
@@ -119,6 +124,11 @@ test-with-docker: prepare-docker-build-image ## Run tests inside a Docker contai
 		-e GIT_COMMIT=${GIT_COMMIT} \
 		-e BUILD_NUMBER=${BUILD_NUMBER} \
 		-e BUILD_URL=${BUILD_URL} \
+		-e http_proxy="${HTTP_PROXY}" \
+		-e HTTP_PROXY="${HTTP_PROXY}" \
+		-e https_proxy="${HTTPS_PROXY}" \
+		-e HTTPS_PROXY="${HTTPS_PROXY}" \
+		-e NO_PROXY="${NO_PROXY}" \
 		${DOCKER_BUILDER_IMAGE_NAME} \
 		make test
 
@@ -135,6 +145,11 @@ coverage-with-docker: prepare-docker-build-image ## Generates coverage report in
 		-e CI_BUILD_URL=${BUILD_URL} \
 		-e CI_BRANCH=${GIT_BRANCH} \
 		-e CI_PULL_REQUEST=${CI_PULL_REQUEST} \
+		-e http_proxy="${HTTP_PROXY}" \
+		-e HTTP_PROXY="${HTTP_PROXY}" \
+		-e https_proxy="${HTTPS_PROXY}" \
+		-e HTTPS_PROXY="${HTTPS_PROXY}" \
+		-e NO_PROXY="${NO_PROXY}" \
 		${DOCKER_BUILDER_IMAGE_NAME} \
 		make coverage
 
diff --git a/docker/Dockerfile-build b/docker/Dockerfile-build
index 2ce5a28bd..e22b9f321 100644
--- a/docker/Dockerfile-build
+++ b/docker/Dockerfile-build
@@ -1,11 +1,14 @@
 FROM python:3.4-slim
 
+ARG APT_HTTP_PROXY
+
 ENV PYTHONUNBUFFERED=1 \
 	DEBIAN_FRONTEND=noninteractive \
 	NODEJS_VERSION=6.3.1-1nodesource1~jessie1
 
 RUN \
 	echo "Install base packages" \
+	&& ([ -z "$APT_HTTP_PROXY" ] || echo "Acquire::http::Proxy \"${APT_HTTP_PROXY}\";\n" > /etc/apt/apt.conf.d/99HttpProxy) \
 	&& apt-get update \
 	&& apt-get install -y --no-install-recommends \
 		apt-transport-https \
diff --git a/docker/Makefile b/docker/Makefile
index e39e6167e..23f3c32ce 100644
--- a/docker/Makefile
+++ b/docker/Makefile
@@ -7,4 +7,4 @@ help:
 
 .PHONY: build-build-image
 build-build-image:
-	docker build --pull -f Dockerfile-build -t govuk/notify-admin-builder .
+	docker build --pull -f Dockerfile-build -t govuk/notify-admin-builder --build-arg APT_HTTP_PROXY="${HTTP_PROXY}" .