diff --git a/README.md b/README.md
index a7e5dc0..d6934c1 100644
--- a/README.md
+++ b/README.md
@@ -50,6 +50,9 @@ sh scripts/load_buildings.sh data/osm/northwestern-fed-district-latest.osm.pbf
 docker compose restart api worker
 ```
 
+The script builds a local `radio-osm2pgsql:latest` image from
+`scripts/Dockerfile.osm2pgsql` on first run.
+
 The import writes a `buildings` table with `geom`, `height_m`, `levels`,
 `building_type`, and `source`. Heights come from `height`, then
 `building:levels * 3.0`, then an estimated default by building type.
diff --git a/scripts/Dockerfile.osm2pgsql b/scripts/Dockerfile.osm2pgsql
new file mode 100644
index 0000000..4fdb9e7
--- /dev/null
+++ b/scripts/Dockerfile.osm2pgsql
@@ -0,0 +1,7 @@
+FROM debian:bookworm-slim
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends ca-certificates osm2pgsql \
+    && rm -rf /var/lib/apt/lists/*
+
+ENTRYPOINT ["osm2pgsql"]
diff --git a/scripts/load_buildings.sh b/scripts/load_buildings.sh
index 491647a..df538d4 100644
--- a/scripts/load_buildings.sh
+++ b/scripts/load_buildings.sh
@@ -23,7 +23,7 @@ DB_NAME=${POSTGRES_DB:-radio}
 DB_USER=${POSTGRES_USER:-radio}
 DB_PASSWORD=${DB_PASSWORD:-radio}
 POSTGIS_SERVICE=${POSTGIS_SERVICE:-postgis}
-OSM2PGSQL_IMAGE=${OSM2PGSQL_IMAGE:-osm2pgsql/osm2pgsql:latest}
+OSM2PGSQL_IMAGE=${OSM2PGSQL_IMAGE:-radio-osm2pgsql:latest}
 
 SCRIPT_DIR=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)
 REPO_DIR=$(CDPATH= cd -- "$SCRIPT_DIR/.." && pwd)
@@ -40,6 +40,14 @@ NETWORK=$(docker inspect "$POSTGIS_CONTAINER" \
   --format '{{range $name, $_ := .NetworkSettings.Networks}}{{println $name}}{{end}}' \
   | head -n 1)
 
+if ! docker image inspect "$OSM2PGSQL_IMAGE" >/dev/null 2>&1; then
+  echo "Build local osm2pgsql image: $OSM2PGSQL_IMAGE"
+  docker build \
+    -t "$OSM2PGSQL_IMAGE" \
+    -f "$SCRIPT_DIR/Dockerfile.osm2pgsql" \
+    "$SCRIPT_DIR"
+fi
+
 echo "Ensure PostGIS extension exists"
 docker compose exec -T "$POSTGIS_SERVICE" psql -U "$DB_USER" -d "$DB_NAME" \
   < "$REPO_DIR/db/init/01_postgis.sql"