diff --git a/src/components/molecules/CartButton/CartButton.stories.tsx b/src/components/molecules/CartButton/CartButton.stories.tsx
new file mode 100644
index 0000000..16ce84d
--- /dev/null
+++ b/src/components/molecules/CartButton/CartButton.stories.tsx
@@ -0,0 +1,97 @@
+import type { Meta, StoryObj } from '@storybook/react';
+import Box from '@mui/material/Box';
+import { CartButton } from './CartButton';
+import { StepIndicator } from '../StepIndicator';
+import type { CartItem } from './CartButton';
+
+const sampleItems: CartItem[] = [
+  { section: 'Funeral Provider', name: 'H. Parsons — Essential Package', price: 4950 },
+  { section: 'Service Venue', name: 'West Chapel', price: 900 },
+  { section: 'Service Venue', name: 'Photo presentation', price: 150 },
+  { section: 'Crematorium', name: 'Warrill Park Crematorium', price: 850 },
+  { section: 'Coffin', name: 'Richmond Rosewood', price: 1750 },
+  { section: 'Optional Extras', name: 'Live musician — Vocalist', price: 450 },
+  { section: 'Optional Extras', name: 'Catering', priceLabel: 'Price on application' },
+];
+
+const meta: Meta<typeof CartButton> = {
+  title: 'Molecules/CartButton',
+  component: CartButton,
+  tags: ['autodocs'],
+  parameters: {
+    layout: 'centered',
+  },
+};
+
+export default meta;
+type Story = StoryObj<typeof CartButton>;
+
+// ─── Default ────────────────────────────────────────────────────────────────
+
+/** Full cart with multiple sections */
+export const Default: Story = {
+  args: {
+    total: 9050,
+    items: sampleItems,
+  },
+};
+
+// ─── Empty ──────────────────────────────────────────────────────────────────
+
+/** Empty plan — no items selected yet */
+export const Empty: Story = {
+  args: {
+    total: 0,
+    items: [],
+  },
+};
+
+// ─── Single item ────────────────────────────────────────────────────────────
+
+/** Just the package selected */
+export const SingleItem: Story = {
+  args: {
+    total: 4950,
+    items: [{ section: 'Funeral Provider', name: 'H. Parsons — Essential Package', price: 4950 }],
+  },
+};
+
+// ─── In progress bar context ────────────────────────────────────────────────
+
+/** How it looks inside the wizard progress bar */
+export const InProgressBar: Story = {
+  render: () => (
+    <Box
+      sx={{
+        display: 'flex',
+        alignItems: 'center',
+        justifyContent: 'space-between',
+        gap: 2,
+        width: '100%',
+        maxWidth: 900,
+        borderBottom: '1px solid',
+        borderColor: 'divider',
+        bgcolor: 'background.paper',
+        px: 4,
+        py: 1.5,
+      }}
+    >
+      <Box sx={{ flex: 1 }}>
+        <StepIndicator
+          steps={[
+            { label: 'Details' },
+            { label: 'Venues' },
+            { label: 'Coffins' },
+            { label: 'Extras' },
+            { label: 'Review' },
+          ]}
+          currentStep={2}
+        />
+      </Box>
+      <CartButton total={6700} items={sampleItems.slice(0, 4)} />
+    </Box>
+  ),
+  parameters: {
+    layout: 'padded',
+  },
+};
diff --git a/src/components/molecules/CartButton/CartButton.tsx b/src/components/molecules/CartButton/CartButton.tsx
new file mode 100644
index 0000000..24b450b
--- /dev/null
+++ b/src/components/molecules/CartButton/CartButton.tsx
@@ -0,0 +1,175 @@
+import React from 'react';
+import Box from '@mui/material/Box';
+import ReceiptLongOutlinedIcon from '@mui/icons-material/ReceiptLongOutlined';
+import type { SxProps, Theme } from '@mui/material/styles';
+import { Typography } from '../../atoms/Typography';
+import { Button } from '../../atoms/Button';
+import { DialogShell } from '../../atoms/DialogShell';
+import { Divider } from '../../atoms/Divider';
+import { LineItem } from '../LineItem';
+
+// ─── Types ───────────────────────────────────────────────────────────────────
+
+/** A single item in the plan cart */
+export interface CartItem {
+  /** Section heading (e.g. "Funeral Provider", "Venue") */
+  section: string;
+  /** Item name */
+  name: string;
+  /** Price in dollars — omit for included/complimentary items */
+  price?: number;
+  /** Custom price label (e.g. "Price on application", "Included") */
+  priceLabel?: string;
+}
+
+/** Props for the CartButton molecule */
+export interface CartButtonProps {
+  /** Running total in dollars */
+  total: number;
+  /** Cart items grouped by section */
+  items?: CartItem[];
+  /** Override the structured dialog body with custom content */
+  children?: React.ReactNode;
+  /** MUI sx prop for the trigger button */
+  sx?: SxProps<Theme>;
+}
+
+// ─── Helpers ─────────────────────────────────────────────────────────────────
+
+/** Group items by their section heading */
+const groupBySection = (items: CartItem[]) => {
+  const groups: { section: string; items: CartItem[] }[] = [];
+  for (const item of items) {
+    const last = groups[groups.length - 1];
+    if (last && last.section === item.section) {
+      last.items.push(item);
+    } else {
+      groups.push({ section: item.section, items: [item] });
+    }
+  }
+  return groups;
+};
+
+// ─── Component ───────────────────────────────────────────────────────────────
+
+/**
+ * Cart button for the arrangement wizard progress bar.
+ *
+ * Shows the running plan total in a compact trigger button. Clicking opens
+ * a DialogShell with the plan contents — items grouped by section using
+ * LineItem molecules.
+ *
+ * Sits in the `runningTotal` slot of WizardLayout.
+ *
+ * Usage:
+ * ```tsx
+ * <CartButton
+ *   total={6715}
+ *   items={[
+ *     { section: 'Funeral Provider', name: 'H. Parsons — Essential Package', price: 4950 },
+ *     { section: 'Venue', name: 'West Chapel', price: 900 },
+ *     { section: 'Extras', name: 'Catering', priceLabel: 'Price on application' },
+ *   ]}
+ * />
+ * ```
+ */
+export const CartButton = React.forwardRef<HTMLButtonElement, CartButtonProps>(
+  ({ total, items = [], children, sx }, ref) => {
+    const [open, setOpen] = React.useState(false);
+    const formattedTotal = `$${total.toLocaleString('en-AU')}`;
+    const groups = groupBySection(items);
+
+    return (
+      <>
+        {/* Trigger */}
+        <Button
+          ref={ref}
+          variant="outlined"
+          color="secondary"
+          size="small"
+          onClick={() => setOpen(true)}
+          aria-haspopup="dialog"
+          startIcon={<ReceiptLongOutlinedIcon sx={{ fontSize: 18 }} />}
+          sx={[
+            {
+              borderRadius: '9999px',
+              textTransform: 'none',
+              gap: 1,
+              pl: 2,
+              pr: 2.5,
+            },
+            ...(Array.isArray(sx) ? sx : [sx]),
+          ]}
+        >
+          <Box component="span" sx={{ display: { xs: 'none', sm: 'inline' }, fontWeight: 500 }}>
+            Your Plan
+          </Box>
+          <Typography
+            component="span"
+            variant="label"
+            sx={{ color: 'primary.main', fontWeight: 700 }}
+          >
+            {formattedTotal}
+          </Typography>
+        </Button>
+
+        {/* Dialog */}
+        <DialogShell
+          open={open}
+          onClose={() => setOpen(false)}
+          title="Your plan so far"
+          maxWidth="xs"
+          footer={
+            <Box sx={{ display: 'flex', justifyContent: 'flex-end', px: 3, py: 2 }}>
+              <Button variant="text" color="secondary" onClick={() => setOpen(false)}>
+                Close
+              </Button>
+            </Box>
+          }
+        >
+          {children || (
+            <Box sx={{ px: 3, py: 2 }}>
+              {items.length === 0 ? (
+                <Typography
+                  variant="body2"
+                  color="text.secondary"
+                  sx={{ textAlign: 'center', py: 4 }}
+                >
+                  Your plan is empty. Selections will appear here as you build your arrangement.
+                </Typography>
+              ) : (
+                <>
+                  {groups.map((group, gi) => (
+                    <Box key={group.section} sx={{ mb: gi < groups.length - 1 ? 2 : 0 }}>
+                      <Typography
+                        variant="labelSm"
+                        color="text.secondary"
+                        sx={{ mb: 1, textTransform: 'uppercase', letterSpacing: '0.05em' }}
+                      >
+                        {group.section}
+                      </Typography>
+                      {group.items.map((item, ii) => (
+                        <LineItem
+                          key={`${group.section}-${ii}`}
+                          name={item.name}
+                          price={item.price}
+                          priceLabel={item.priceLabel}
+                        />
+                      ))}
+                    </Box>
+                  ))}
+
+                  <Divider sx={{ my: 2 }} />
+                  <LineItem name="Total" price={total} variant="total" />
+                </>
+              )}
+            </Box>
+          )}
+        </DialogShell>
+      </>
+    );
+  },
+);
+
+CartButton.displayName = 'CartButton';
+export default CartButton;
diff --git a/src/components/molecules/CartButton/index.ts b/src/components/molecules/CartButton/index.ts
new file mode 100644
index 0000000..d918967
--- /dev/null
+++ b/src/components/molecules/CartButton/index.ts
@@ -0,0 +1,2 @@
+export { default } from './CartButton';
+export * from './CartButton';
diff --git a/src/components/pages/DateTimeStep/DateTimeStep.tsx b/src/components/pages/DateTimeStep/DateTimeStep.tsx
index 7369adc..87f1c3d 100644
--- a/src/components/pages/DateTimeStep/DateTimeStep.tsx
+++ b/src/components/pages/DateTimeStep/DateTimeStep.tsx
@@ -70,6 +70,10 @@ export interface DateTimeStepProps {
   showScheduling?: boolean;
   /** Navigation bar — passed through to WizardLayout */
   navigation?: React.ReactNode;
+  /** Progress stepper */
+  progressStepper?: React.ReactNode;
+  /** Running total widget (e.g. CartButton) */
+  runningTotal?: React.ReactNode;
   /** Hide the help bar */
   hideHelpBar?: boolean;
   /** MUI sx prop for the root */
@@ -115,6 +119,8 @@ export const DateTimeStep: React.FC<DateTimeStepProps> = ({
   showNameFields = true,
   showScheduling = true,
   navigation,
+  progressStepper,
+  runningTotal,
   hideHelpBar,
   sx,
 }) => {
@@ -154,6 +160,8 @@ export const DateTimeStep: React.FC<DateTimeStepProps> = ({
     <WizardLayout
       variant="centered-form"
       navigation={navigation}
+      progressStepper={progressStepper}
+      runningTotal={runningTotal}
       showBackLink={!!onBack}
       backLabel="Back"
       onBack={onBack}
diff --git a/src/components/pages/PaymentStep/PaymentStep.tsx b/src/components/pages/PaymentStep/PaymentStep.tsx
index 48fb731..2f6c0fe 100644
--- a/src/components/pages/PaymentStep/PaymentStep.tsx
+++ b/src/components/pages/PaymentStep/PaymentStep.tsx
@@ -70,6 +70,8 @@ export interface PaymentStepProps {
   navigation?: React.ReactNode;
   /** Progress stepper */
   progressStepper?: React.ReactNode;
+  /** Running total widget (e.g. CartButton) */
+  runningTotal?: React.ReactNode;
   /** Hide the help bar */
   hideHelpBar?: boolean;
   /** MUI sx prop */
@@ -108,6 +110,7 @@ export const PaymentStep: React.FC<PaymentStepProps> = ({
   cardFormSlot,
   navigation,
   progressStepper,
+  runningTotal,
   hideHelpBar,
   sx,
 }) => {
@@ -118,6 +121,7 @@ export const PaymentStep: React.FC<PaymentStepProps> = ({
       variant="centered-form"
       navigation={navigation}
       progressStepper={progressStepper}
+      runningTotal={runningTotal}
       showBackLink={!!onBack}
       backLabel="Back"
       onBack={onBack}
diff --git a/src/components/pages/SummaryStep/SummaryStep.tsx b/src/components/pages/SummaryStep/SummaryStep.tsx
index 9c14360..9264f5b 100644
--- a/src/components/pages/SummaryStep/SummaryStep.tsx
+++ b/src/components/pages/SummaryStep/SummaryStep.tsx
@@ -101,6 +101,8 @@ export interface SummaryStepProps {
   navigation?: React.ReactNode;
   /** Progress stepper */
   progressStepper?: React.ReactNode;
+  /** Running total widget (e.g. CartButton) */
+  runningTotal?: React.ReactNode;
   /** Hide the help bar */
   hideHelpBar?: boolean;
   /** MUI sx prop */
@@ -287,6 +289,7 @@ export const SummaryStep: React.FC<SummaryStepProps> = ({
   isPrePlanning = false,
   navigation,
   progressStepper,
+  runningTotal,
   hideHelpBar,
   sx,
 }) => {
@@ -297,6 +300,7 @@ export const SummaryStep: React.FC<SummaryStepProps> = ({
       variant="centered-form"
       navigation={navigation}
       progressStepper={progressStepper}
+      runningTotal={runningTotal}
       showBackLink={!!onBack}
       backLabel="Back"
       onBack={onBack}
diff --git a/src/components/pages/VenueStep/VenueStep.tsx b/src/components/pages/VenueStep/VenueStep.tsx
index c53cadb..ff863eb 100644
--- a/src/components/pages/VenueStep/VenueStep.tsx
+++ b/src/components/pages/VenueStep/VenueStep.tsx
@@ -52,6 +52,10 @@ export interface VenueStepProps {
   mapPanel?: React.ReactNode;
   /** Navigation bar — passed through to WizardLayout */
   navigation?: React.ReactNode;
+  /** Progress stepper */
+  progressStepper?: React.ReactNode;
+  /** Running total widget (e.g. CartButton) */
+  runningTotal?: React.ReactNode;
   /** MUI sx prop for the root */
   sx?: SxProps<Theme>;
 }
@@ -90,6 +94,8 @@ export const VenueStep: React.FC<VenueStepProps> = ({
   isPrePlanning = false,
   mapPanel,
   navigation,
+  progressStepper,
+  runningTotal,
   sx,
 }) => {
   const subheading = isPrePlanning
@@ -100,6 +106,8 @@ export const VenueStep: React.FC<VenueStepProps> = ({
     <WizardLayout
       variant="list-map"
       navigation={navigation}
+      progressStepper={progressStepper}
+      runningTotal={runningTotal}
       showBackLink
       backLabel="Back"
       onBack={onBack}
diff --git a/src/components/templates/WizardLayout/WizardLayout.tsx b/src/components/templates/WizardLayout/WizardLayout.tsx
index 38fad78..a185bfb 100644
--- a/src/components/templates/WizardLayout/WizardLayout.tsx
+++ b/src/components/templates/WizardLayout/WizardLayout.tsx
@@ -381,8 +381,7 @@ const LAYOUT_MAP: Record<
   'detail-toggles': DetailTogglesLayout,
 };
 
-/** Variants that show the stepper/total bar */
-const STEPPER_VARIANTS: WizardLayoutVariant[] = ['wide-form', 'grid-sidebar', 'detail-toggles'];
+/* Stepper bar renders on any variant when progressStepper or runningTotal is provided */
 
 // ─── Component ───────────────────────────────────────────────────────────────
 
@@ -396,8 +395,8 @@ const STEPPER_VARIANTS: WizardLayoutVariant[] = ['wide-form', 'grid-sidebar', 'd
  * - **grid-sidebar**: Filter sidebar + card grid (coffins)
  * - **detail-toggles**: Hero image + info column (venue, coffin details)
  *
- * All variants share: navigation slot, optional back link, sticky help bar.
- * Grid-sidebar and detail-toggles add: progress stepper, running total widget.
+ * All variants share: navigation slot, optional back link, sticky help bar,
+ * and optional progress stepper + running total bar (shown when props provided).
  */
 export const WizardLayout = React.forwardRef<HTMLDivElement, WizardLayoutProps>(
   (
@@ -418,7 +417,6 @@ export const WizardLayout = React.forwardRef<HTMLDivElement, WizardLayoutProps>(
     ref,
   ) => {
     const LayoutComponent = LAYOUT_MAP[variant];
-    const showStepper = STEPPER_VARIANTS.includes(variant);
 
     return (
       <Box
@@ -446,7 +444,7 @@ export const WizardLayout = React.forwardRef<HTMLDivElement, WizardLayoutProps>(
         {navigation}
 
         {/* Stepper + running total bar (grid-sidebar, detail-toggles only) */}
-        {showStepper && <StepperBar stepper={progressStepper} total={runningTotal} />}
+        <StepperBar stepper={progressStepper} total={runningTotal} />
 
         {/* Back link — inside left panel for list-map/detail-toggles, above content for others */}
         {showBackLink && variant !== 'list-map' && variant !== 'detail-toggles' && (