diff --git a/cypress/e2e/live-tracking/pibi-measures.cy.js b/cypress/e2e/live-tracking/pibi-measures.cy.js
new file mode 100644
index 0000000..59afbe2
--- /dev/null
+++ b/cypress/e2e/live-tracking/pibi-measures.cy.js
@@ -0,0 +1,161 @@
+/**
+ * Live Tracking — PIBI measure selection flow (issue #254)
+ *
+ * Verifies the approver flow for selecting which measures on a deal go for
+ * PIBI:
+ *   1. the approver opens the property drawer at the PIBI section,
+ *   2. ticks and unticks measures in the multi-select,
+ *   3. saves the selection — the drawer reflects the ticked state,
+ *   4. the POST hits the pibi-measures route which pushes
+ *      `measures_for_pibi_ordered` back to HubSpot.
+ *
+ * Mirrors `instruct-measure.cy.js`. The spec uses `cy.intercept` so the
+ * HubSpot push side-effect is observable without a real CRM round-trip.
+ */
+
+const PORTFOLIO_SLUG = Cypress.env("LIVE_PORTFOLIO_SLUG");
+const TARGET_DEAL_NAME = Cypress.env("LIVE_PIBI_DEAL_NAME");
+
+describe("PIBI measure selection — approver flow", function () {
+  before(function () {
+    if (!PORTFOLIO_SLUG) {
+      cy.log(
+        "LIVE_PORTFOLIO_SLUG env var not set — skipping live tracking specs",
+      );
+      this.skip();
+    }
+  });
+
+  function openDrawerAtPibiSection() {
+    cy.visit(`/portfolio/${PORTFOLIO_SLUG}/your-projects/live`);
+
+    // Open a property row to get the detail drawer.
+    cy.contains("button, [role=tab]", "Measures").click();
+
+    if (TARGET_DEAL_NAME) {
+      cy.contains("[data-testid=measures-row]", TARGET_DEAL_NAME).click();
+    } else {
+      cy.get("[data-testid=measures-row]").first().click();
+    }
+
+    cy.get("[data-testid=property-detail-drawer]").should("be.visible");
+
+    // Scroll to the PIBI section.
+    cy.get("[data-testid=drawer-section-pibi]").should("exist").scrollIntoView();
+  }
+
+  it("fetches the PIBI state and shows the multi-select for approvers", () => {
+    // Stub the GET so we control the initial state.
+    cy.intercept(
+      "GET",
+      `/api/portfolio/*/pibi-measures*`,
+      {
+        body: {
+          pibiMeasures: ["ASHP"],
+          approvedMeasures: ["ASHP", "Solar PV"],
+          instructedMeasures: [],
+        },
+      },
+    ).as("getPibiMeasures");
+
+    openDrawerAtPibiSection();
+
+    cy.wait("@getPibiMeasures");
+
+    // The multi-select should be visible for approvers.
+    cy.get("[data-testid=pibi-measure-selector]").should("be.visible");
+
+    // ASHP should be checked (was in pibiMeasures).
+    cy.get("[data-testid=pibi-measure-checkbox-ASHP]").should(
+      "be.checked",
+    );
+  });
+
+  it("lets an approver tick/untick selections and POST to the route", () => {
+    // Stub GET to return a clean state.
+    cy.intercept(
+      "GET",
+      `/api/portfolio/*/pibi-measures*`,
+      {
+        body: {
+          pibiMeasures: [],
+          approvedMeasures: ["ASHP", "Solar PV"],
+          instructedMeasures: [],
+        },
+      },
+    ).as("getPibiMeasures");
+
+    // Intercept the POST so we can assert the body.
+    cy.intercept(
+      "POST",
+      `/api/portfolio/*/pibi-measures`,
+    ).as("savePibiMeasures");
+
+    openDrawerAtPibiSection();
+
+    cy.wait("@getPibiMeasures");
+
+    cy.get("[data-testid=pibi-measure-selector]").should("be.visible");
+
+    // Both approved measures (ASHP, Solar PV) should be pre-ticked since
+    // pibiMeasures was empty and approvedMeasures had values.
+    cy.get("[data-testid=pibi-measure-checkbox-ASHP]").should("be.checked");
+    cy.get("[data-testid=pibi-measure-checkbox-Solar PV]").should("be.checked");
+
+    // Untick ASHP.
+    cy.get("[data-testid=pibi-measure-option-ASHP]").click();
+    cy.get("[data-testid=pibi-measure-checkbox-ASHP]").should("not.be.checked");
+
+    // Save the selection.
+    cy.get("[data-testid=pibi-selector-save]").click();
+
+    cy.wait("@savePibiMeasures").then((intercepted) => {
+      // Body should reflect the new selection (Solar PV only).
+      expect(intercepted.request.body).to.have.property("dealId");
+      expect(intercepted.request.body.measureNames).to.include("Solar PV");
+      expect(intercepted.request.body.measureNames).not.to.include("ASHP");
+
+      // Route returns ok=true.
+      expect(intercepted.response.statusCode).to.be.oneOf([200, 201]);
+      expect(intercepted.response.body).to.have.property("ok", true);
+      expect(intercepted.response.body).to.have.property(
+        "hubspotSync",
+      );
+    });
+
+    // No error banner visible.
+    cy.get("[data-testid=pibi-selector-error]").should("not.exist");
+  });
+
+  it("pushes measures_for_pibi_ordered to HubSpot on a successful save", () => {
+    cy.intercept(
+      "GET",
+      `/api/portfolio/*/pibi-measures*`,
+      {
+        body: {
+          pibiMeasures: ["CWI"],
+          approvedMeasures: ["CWI"],
+          instructedMeasures: [],
+        },
+      },
+    ).as("getPibiMeasures");
+
+    // Stub the POST to confirm the property pushed.
+    cy.intercept("POST", `/api/portfolio/*/pibi-measures`, {
+      body: { ok: true, hubspotSync: "ok" },
+    }).as("savePibiMeasures");
+
+    openDrawerAtPibiSection();
+
+    cy.wait("@getPibiMeasures");
+
+    cy.get("[data-testid=pibi-selector-save]").click();
+
+    cy.wait("@savePibiMeasures").then((intercepted) => {
+      // Confirm the POST body contains the right measures.
+      expect(intercepted.request.body).to.have.property("measureNames");
+      // Response signals a successful HubSpot push.
+      expect(intercepted.response.body.hubspotSync).to.equal("ok");
+    });
+  });
+});