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diff --git a/mattertimectl/build/tasks/main.yaml b/mattertimectl/build/tasks/main.yaml
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+---
+
+- name: ensure build work dir exists
+  become: yes
+  file:
+    path: "{{build_work_dir}}"
+    state: "directory"
+    owner: "{{ansible_user}}"
+    group: "{{ansible_user}}"
+    mode: "0755"
+
+- name: check if mattertimectl build exists
+  stat:
+    path: "{{mattertimectl_srv_dir}}/mattertimectl-{{mattertimectl_version}}.tar.gz"
+  register: build_file
+
+# NOTE: rustup is used only because rs-matter requires a newer rustc than
+# Ubuntu 24.04's apt ships (apt rustc is 1.75; rs-matter needs >= 1.87). Once
+# the build host runs an Ubuntu whose apt rustc/cargo are new enough, drop
+# rustup and the toolchain tasks below and just `apt install rustc cargo`.
+- name: install rustup
+  become: yes
+  apt:
+    name: "rustup"
+    state: "present"
+
+- name: install a current stable rust toolchain
+  command: "rustup toolchain install stable"
+  environment:
+    CARGO_HOME: "{{mattertimectl_cargo_home}}"
+    RUSTUP_HOME: "{{mattertimectl_rustup_home}}"
+  when: not build_file.stat.exists
+
+- name: unarchive mattertimectl source
+  unarchive:
+    remote_src: yes
+    src: "{{mattertimectl_tar}}"
+    dest: "{{build_work_dir}}/"
+    creates: "{{mattertimectl_build_dir}}"
+
+- name: build mattertimectl release binary
+  # rustup run stable dispatches cargo through the toolchain regardless of
+  # the apt rustup package's proxy layout or the configured default.
+  command: "rustup run stable cargo build --release"
+  args:
+    chdir: "{{mattertimectl_build_dir}}"
+    creates: "{{mattertimectl_cargo_target_dir}}/release/mattertimectl"
+  environment:
+    CARGO_HOME: "{{mattertimectl_cargo_home}}"
+    RUSTUP_HOME: "{{mattertimectl_rustup_home}}"
+    CARGO_TARGET_DIR: "{{mattertimectl_cargo_target_dir}}"
+  when: not build_file.stat.exists
+
+- name: create build server dir
+  become: yes
+  file:
+    path: "{{mattertimectl_srv_dir}}"
+    mode: "0755"
+    state: "directory"
+
+- name: create gz archive of mattertimectl binary
+  become: yes
+  archive:
+    path: "{{mattertimectl_cargo_target_dir}}/release/mattertimectl"
+    dest: "{{mattertimectl_srv_dir}}/mattertimectl-{{mattertimectl_version}}.tar.gz"
+    format: "gz"
+    # force a real tar for the single-file binary; the module otherwise gzips
+    # a lone file into a bare .gz that the server's unarchive can't extract.
+    # The tar preserves the executable bit the target relies on.
+    force_archive: true
+  when: not build_file.stat.exists