diff --git a/Dockerfile b/Dockerfile
index 2c3887c2..b59addae 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -35,8 +35,7 @@ FROM base AS development
 # Temporarily disable the postinstall NPM script
 RUN npm pkg set scripts.postinstall="echo no-postinstall" \
 && npm ci --ignore-scripts --omit dev \
-&& npm run build \
-&& npm run build-map
+&& npm run build
 
 USER node
 EXPOSE ${PORT}/tcp
diff --git a/client/js/defra-map/index.js b/client/js/defra-map/index.js
index 04700a33..aa05a9bf 100644
--- a/client/js/defra-map/index.js
+++ b/client/js/defra-map/index.js
@@ -364,6 +364,7 @@ getDefraMapConfig().then((defraMapConfig) => {
     minZoom: 6,
     maxZoom: 20,
     centre: [340367, 322766],
+    maxExtent: [0, 0, 700000, 1300000],
     height: '100%',
     hasGeoLocation: false,
     framework: 'esri',
diff --git a/package.json b/package.json
index d009b058..0d328254 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,7 @@
     "copy": "npm run copy:gov && npm run copy:assets",
     "copy:gov": "sh ./bin/copy-gov && node ./bin/fix-layout.js",
     "copy:assets": "sh ./bin/copy-assets",
-    "build:js": "sh ./bin/build-js",
+    "build:js": "sh ./bin/build-js && npm run build-map",
     "build:css": "sh ./bin/build-css",
     "build": "sh ./bin/build",
     "build-map": "rm dist/* -f && webpack",