diff --git a/backend/routers/portal.py b/backend/routers/portal.py
index 1cc01c1..1382b45 100644
--- a/backend/routers/portal.py
+++ b/backend/routers/portal.py
@@ -66,6 +66,26 @@ def active_unit_for_location(location_id: str, db: Session):
     return asg.unit_id if asg else None
 
 
+def _client_locations(client: Client, db: Session) -> list:
+    """The client's active sound locations (for the overview tiles + map)."""
+    pids = _client_project_ids(client, db)
+    if not pids:
+        return []
+    projs = {p.id: p.name for p in
+             db.query(Project.id, Project.name).filter(Project.id.in_(pids)).all()}
+    locs = (db.query(MonitoringLocation)
+            .filter(MonitoringLocation.project_id.in_(pids),
+                    MonitoringLocation.location_type == "sound",
+                    MonitoringLocation.removed_at.is_(None))
+            .order_by(MonitoringLocation.sort_order, MonitoringLocation.name).all())
+    return [{
+        "id": loc.id, "name": loc.name,
+        "address": loc.address, "coordinates": loc.coordinates,
+        "project_name": projs.get(loc.project_id),
+        "has_device": active_unit_for_location(loc.id, db) is not None,
+    } for loc in locs]
+
+
 @router.get("/enter/{token}")
 def portal_enter(token: str, request: Request, db: Session = Depends(get_db)):
     """Magic-URL entry: validate the token, mint a session cookie, land on /portal."""
@@ -101,14 +121,28 @@ def portal_access(request: Request):
 
 
 @router.get("")
-def portal_home(request: Request, client: Client = Depends(get_current_client)):
-    """Client overview. (M1 task 4 fills in the scoped location list + map.)"""
+def portal_home(request: Request, client: Client = Depends(get_current_client),
+                db: Session = Depends(get_db)):
+    """Client overview — their active sound locations with live tiles + a map."""
     return templates.TemplateResponse(
         "portal/overview.html",
-        {"request": request, "client": client, "locations": []},
+        {"request": request, "client": client,
+         "locations": _client_locations(client, db)},
     )
 
 
+@router.get("/location/{location_id}")
+def portal_location(location_id: str, request: Request,
+                    client: Client = Depends(get_current_client),
+                    db: Session = Depends(get_db)):
+    """Read-only live view for one of the client's locations (404 if not owned)."""
+    loc = resolve_client_location(client, location_id, db)
+    return templates.TemplateResponse("portal/location.html", {
+        "request": request, "client": client, "location": loc,
+        "has_device": active_unit_for_location(location_id, db) is not None,
+    })
+
+
 # -- scoped data (cache reads only — never hits the device) ------------------
 
 @router.get("/api/location/{location_id}/live")
diff --git a/templates/portal/location.html b/templates/portal/location.html
new file mode 100644
index 0000000..4bb107b
--- /dev/null
+++ b/templates/portal/location.html
@@ -0,0 +1,138 @@
+{% extends "portal/base.html" %}
+{% block title %}{{ location.name }}{% endblock %}
+{% block head %}
+<script src="https://cdn.jsdelivr.net/npm/chart.js@4"></script>
+{% endblock %}
+{% block content %}
+<a href="/portal" class="text-sm text-gray-400 hover:text-gray-200">&larr; All locations</a>
+<h1 class="text-2xl font-semibold mt-1">{{ location.name }}</h1>
+<div class="flex items-center gap-2 text-sm mt-1 mb-6">
+    <span id="p-badge" class="hidden px-2 py-0.5 text-xs font-medium rounded-full"></span>
+    <span id="p-fresh" class="text-gray-400"></span>
+</div>
+
+{% if not has_device %}
+<div class="rounded-xl border border-slate-700 bg-slate-800/50 p-8 text-center text-gray-400">
+    No device is currently assigned to this location.
+</div>
+{% else %}
+<div class="grid grid-cols-2 sm:grid-cols-5 gap-3 mb-6">
+    <div class="rounded-lg bg-slate-800/60 border border-slate-700 p-3">
+        <div class="text-xs text-gray-400">Lp (Instant)</div>
+        <div id="p-lp" class="text-2xl font-bold text-blue-400">--</div><div class="text-xs text-gray-500">dB</div>
+    </div>
+    <div class="rounded-lg bg-slate-800/60 border border-slate-700 p-3">
+        <div class="text-xs text-gray-400">Leq (Average)</div>
+        <div id="p-leq" class="text-2xl font-bold text-green-400">--</div><div class="text-xs text-gray-500">dB</div>
+    </div>
+    <div class="rounded-lg bg-slate-800/60 border border-slate-700 p-3">
+        <div class="text-xs text-gray-400">Lmax (Max)</div>
+        <div id="p-lmax" class="text-2xl font-bold text-red-400">--</div><div class="text-xs text-gray-500">dB</div>
+    </div>
+    <div class="rounded-lg bg-slate-800/60 border border-slate-700 p-3">
+        <div class="text-xs text-gray-400">L1</div>
+        <div id="p-ln1" class="text-2xl font-bold text-purple-400">--</div><div class="text-xs text-gray-500">dB</div>
+    </div>
+    <div class="rounded-lg bg-slate-800/60 border border-slate-700 p-3">
+        <div class="text-xs text-gray-400">L10</div>
+        <div id="p-ln2" class="text-2xl font-bold text-orange-400">--</div><div class="text-xs text-gray-500">dB</div>
+    </div>
+</div>
+
+<div class="rounded-xl border border-slate-700 bg-slate-800/50 p-4" style="min-height: 360px;">
+    <canvas id="p-chart"></canvas>
+</div>
+{% endif %}
+{% endblock %}
+
+{% block scripts %}
+{% if has_device %}
+<script>
+const LOC_ID = "{{ location.id }}";
+const cd = { t: [], lp: [], leq: [], ln1: [], ln2: [] };
+let chart;
+const numOrNull = v => { const f = parseFloat(v); return isNaN(f) ? null : f; };
+
+function ds(label, color) {
+    return { label, data: [], borderColor: color, backgroundColor: color,
+             borderWidth: 2, pointRadius: 0, tension: 0.3, spanGaps: true };
+}
+function initChart() {
+    const ctx = document.getElementById('p-chart').getContext('2d');
+    chart = new Chart(ctx, {
+        type: 'line',
+        data: { labels: [], datasets: [
+            ds('Lp', 'rgb(96,165,250)'), ds('Leq', 'rgb(74,222,128)'),
+            ds('L1', 'rgb(192,132,252)'), ds('L10', 'rgb(251,146,60)') ] },
+        options: {
+            responsive: true, maintainAspectRatio: false, animation: false,
+            interaction: { intersect: false, mode: 'index' },
+            scales: {
+                y: { min: 30, max: 130, title: { display: true, text: 'dB', color: '#94a3b8' },
+                     ticks: { color: '#94a3b8' }, grid: { color: 'rgba(148,163,184,0.12)' } },
+                x: { ticks: { color: '#94a3b8', maxTicksLimit: 8 }, grid: { color: 'rgba(148,163,184,0.12)' } }
+            },
+            plugins: { legend: { labels: { color: '#cbd5e1' } } }
+        }
+    });
+}
+
+function setCard(id, v) { document.getElementById(id).textContent = (v == null || v === '') ? '--' : v; }
+function setBadge(measuring, lastSeen) {
+    const b = document.getElementById('p-badge'), f = document.getElementById('p-fresh');
+    if (measuring === null) { b.className = 'hidden px-2 py-0.5 text-xs font-medium rounded-full'; b.textContent = ''; }
+    else if (measuring) { b.className = 'px-2 py-0.5 text-xs font-medium rounded-full bg-green-900/40 text-green-300'; b.textContent = '● Live'; }
+    else { b.className = 'px-2 py-0.5 text-xs font-medium rounded-full bg-slate-700 text-gray-300'; b.textContent = '■ Stopped'; }
+    f.innerHTML = fmtFreshness(lastSeen);
+}
+function fmtFreshness(iso) {
+    if (!iso) return '<span class="text-gray-500">no recent reading</span>';
+    const t = new Date(iso.endsWith('Z') ? iso : iso + 'Z');
+    const s = Math.max(0, Math.round((Date.now() - t.getTime()) / 1000));
+    let ago, stale = false;
+    if (s < 10) ago = 'just now';
+    else if (s < 60) ago = s + 's ago';
+    else if (s < 3600) { ago = Math.round(s / 60) + 'm ago'; stale = s >= 300; }
+    else { ago = Math.round(s / 3600) + 'h ago'; stale = true; }
+    const cls = stale ? 'text-amber-400' : 'text-gray-400';
+    return `as of ${t.toLocaleTimeString()} <span class="${cls}">(${ago}${stale ? ' · cached' : ''})</span>`;
+}
+
+async function prefill() {
+    try {
+        const j = await (await fetch(`/portal/api/location/${encodeURIComponent(LOC_ID)}/live`)).json();
+        const d = j.data;
+        if (!d) {
+            setBadge(null, null);
+            document.getElementById('p-fresh').textContent =
+                j.reason === 'no_device' ? 'No device assigned' : 'Currently unreachable';
+            return;
+        }
+        setCard('p-lp', d.lp); setCard('p-leq', d.leq); setCard('p-lmax', d.lmax);
+        setCard('p-ln1', d.ln1); setCard('p-ln2', d.ln2);
+        const measuring = d.measurement_state === 'Start' || d.measurement_state === 'Measure';
+        setBadge(measuring, d.last_seen);
+    } catch (e) { /* keep last values */ }
+}
+async function backfill() {
+    try {
+        const j = await (await fetch(`/portal/api/location/${encodeURIComponent(LOC_ID)}/history?hours=2`)).json();
+        for (const row of (j.readings || [])) {
+            cd.t.push(row.timestamp ? new Date(row.timestamp + 'Z').toLocaleTimeString() : '');
+            cd.lp.push(numOrNull(row.lp)); cd.leq.push(numOrNull(row.leq));
+            cd.ln1.push(numOrNull(row.ln1)); cd.ln2.push(numOrNull(row.ln2));
+        }
+        chart.data.labels = cd.t;
+        chart.data.datasets[0].data = cd.lp; chart.data.datasets[1].data = cd.leq;
+        chart.data.datasets[2].data = cd.ln1; chart.data.datasets[3].data = cd.ln2;
+        chart.update('none');
+    } catch (e) { /* leave chart empty */ }
+}
+
+initChart();
+prefill();
+backfill();
+setInterval(prefill, 15000);   // cache poll — read-only, no device contention
+</script>
+{% endif %}
+{% endblock %}
diff --git a/templates/portal/overview.html b/templates/portal/overview.html
index fefc731..a5b0994 100644
--- a/templates/portal/overview.html
+++ b/templates/portal/overview.html
@@ -1,16 +1,29 @@
 {% extends "portal/base.html" %}
 {% block title %}Your locations{% endblock %}
+{% block head %}
+<link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css" />
+{% endblock %}
 {% block content %}
 <h1 class="text-2xl font-semibold mb-1">Your monitoring locations</h1>
-<p class="text-gray-400 text-sm mb-6">Live sound levels for your active locations.</p>
+<p class="text-gray-400 text-sm mb-6">Live sound levels for your active locations. Read-only.</p>
 
-{# M1 task 4 fleshes this out into location tiles + a map. #}
 {% if locations %}
+<div id="loc-map" class="h-64 rounded-xl overflow-hidden mb-6 hidden border border-slate-700"></div>
+
 <div class="grid sm:grid-cols-2 lg:grid-cols-3 gap-4">
     {% for loc in locations %}
-    <a href="/portal/location/{{ loc.id }}" class="block rounded-xl border border-slate-700 bg-slate-800/50 p-4 hover:border-seismo-orange transition-colors">
-        <div class="font-semibold">{{ loc.name }}</div>
-        <div class="text-xs text-gray-400 mt-1">{{ loc.address or loc.project_name }}</div>
+    <a href="/portal/location/{{ loc.id }}" data-loc="{{ loc.id }}"
+       class="loc-tile block rounded-xl border border-slate-700 bg-slate-800/50 p-4 hover:border-seismo-orange transition-colors">
+        <div class="flex items-start justify-between gap-2">
+            <div class="font-semibold">{{ loc.name }}</div>
+            <span class="loc-badge hidden shrink-0 px-2 py-0.5 text-xs rounded-full"></span>
+        </div>
+        <div class="text-xs text-gray-400 mt-0.5 truncate">{{ loc.address or loc.project_name or '' }}</div>
+        <div class="mt-3 flex items-baseline gap-1">
+            <span class="loc-lp text-3xl font-bold text-seismo-orange">--</span>
+            <span class="text-sm text-gray-400">dB Lp</span>
+        </div>
+        <div class="loc-fresh text-xs text-gray-500 mt-1">&nbsp;</div>
     </a>
     {% endfor %}
 </div>
@@ -20,3 +33,67 @@
 </div>
 {% endif %}
 {% endblock %}
+
+{% block scripts %}
+<script src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js"></script>
+<script>
+const LOCATIONS = {{ locations|tojson }};
+
+function fmtAgo(iso) {
+    if (!iso) return '';
+    const t = new Date(iso.endsWith('Z') ? iso : iso + 'Z');
+    const s = Math.max(0, Math.round((Date.now() - t.getTime()) / 1000));
+    if (s < 60) return 'updated just now';
+    if (s < 3600) return 'updated ' + Math.round(s / 60) + 'm ago';
+    return 'updated ' + Math.round(s / 3600) + 'h ago';
+}
+
+async function loadTile(loc) {
+    const el = document.querySelector(`.loc-tile[data-loc="${loc.id}"]`);
+    if (!el) return;
+    const lp = el.querySelector('.loc-lp'), badge = el.querySelector('.loc-badge'),
+          fresh = el.querySelector('.loc-fresh');
+    try {
+        const j = await (await fetch(`/portal/api/location/${encodeURIComponent(loc.id)}/live`)).json();
+        const d = j.data;
+        badge.classList.remove('hidden');
+        if (!d) {
+            badge.textContent = j.reason === 'no_device' ? 'No device' : 'Offline';
+            badge.className = 'loc-badge shrink-0 px-2 py-0.5 text-xs rounded-full bg-slate-700 text-gray-300';
+            lp.textContent = '--'; fresh.innerHTML = '&nbsp;';
+            return;
+        }
+        lp.textContent = (d.lp == null || d.lp === '') ? '--' : d.lp;
+        const measuring = d.measurement_state === 'Start' || d.measurement_state === 'Measure';
+        badge.textContent = measuring ? '● Live' : 'Stopped';
+        badge.className = 'loc-badge shrink-0 px-2 py-0.5 text-xs rounded-full ' +
+            (measuring ? 'bg-green-900/40 text-green-300' : 'bg-slate-700 text-gray-300');
+        fresh.textContent = fmtAgo(d.last_seen);
+    } catch (e) { /* leave placeholders */ }
+}
+
+function refreshTiles() { LOCATIONS.forEach(loadTile); }
+refreshTiles();
+setInterval(refreshTiles, 15000);
+
+// Map of locations that have coordinates
+const withCoords = LOCATIONS.filter(l => l.coordinates);
+if (withCoords.length) {
+    const mapEl = document.getElementById('loc-map');
+    mapEl.classList.remove('hidden');
+    const map = L.map('loc-map');
+    L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
+        { maxZoom: 19, attribution: '© OpenStreetMap' }).addTo(map);
+    const pts = [];
+    withCoords.forEach(l => {
+        const [la, lo] = (l.coordinates || '').split(',').map(Number);
+        if (!isNaN(la) && !isNaN(lo)) {
+            L.marker([la, lo]).addTo(map).bindPopup(l.name);
+            pts.push([la, lo]);
+        }
+    });
+    if (pts.length) map.fitBounds(pts, { padding: [30, 30], maxZoom: 15 });
+    else mapEl.classList.add('hidden');
+}
+</script>
+{% endblock %}