diff --git a/src/app/api/portfolio/summary/[portfolioId]/route.ts b/src/app/api/portfolio/summary/[portfolioId]/route.ts
new file mode 100644
index 0000000..760e781
--- /dev/null
+++ b/src/app/api/portfolio/summary/[portfolioId]/route.ts
@@ -0,0 +1,144 @@
+import { portfolio } from "@/app/db/schema/portfolio";
+import { NextRequest, NextResponse } from "next/server";
+import { db } from "@/app/db/db";
+import { z } from "zod";
+import { formatNumber } from "@/app/utils";
+import { DataItem, ChartData } from "@/app/portfolio/[slug]/utils";
+import { eq } from "drizzle-orm";
+
+export async function GET(
+  request: NextRequest,
+  { params }: { params: { portfolioId: string } }
+) {
+  const portfolioId = params.portfolioId;
+
+  const data = await db
+    .select({
+      name: portfolio.name,
+      cost: portfolio.cost,
+      epcBreakdownPostRetrofit: portfolio.epcBreakdownPostRetrofit,
+      nUnitsToRetrofit: portfolio.nUnitsToRetrofit,
+      co2PerUnitPostRetrofit: portfolio.co2PerUnitPostRetrofit,
+      energyBillPerUnitPostRetrofit: portfolio.energyBillPerUnitPostRetrofit,
+      energyConsumptionPerUnitPostRetrofit:
+        portfolio.energyConsumptionPerUnitPostRetrofit,
+      valuationImprovementPerUnit: portfolio.valuationImprovementPerUnit,
+      costPerUnit: portfolio.costPerUnit,
+      costPerCo2Saved: portfolio.costPerCo2Saved,
+      costPerSapPoint: portfolio.costPerSapPoint,
+      valuationReturnOnInvestment: portfolio.valuationReturnOnInvestment,
+    })
+    .from(portfolio)
+    .where(eq(portfolio.id, BigInt(portfolioId)));
+
+  if (data.length === 0) {
+    throw new Error("Portfolio not found");
+  }
+
+  if (data.length > 1) {
+    throw new Error("More than one portfolio found");
+  }
+
+  const portfolioName = data[0].name;
+
+  // Format the data we need for the overview
+  const output: DataItem[] = [
+    {
+      title: "EPCs",
+      scenarios: [
+        {
+          scenarioName: portfolioName,
+          data: JSON.parse(
+            data[0].epcBreakdownPostRetrofit || "[]"
+          ) as ChartData[],
+        },
+      ],
+    },
+    {
+      title: "# Units",
+      scenarios: [{ scenarioName: portfolioName, data: "" }],
+    },
+    {
+      title: "# Units to retrofit",
+      scenarios: [
+        {
+          scenarioName: portfolioName,
+          data: String(data[0].nUnitsToRetrofit) || "",
+        },
+      ],
+    },
+    {
+      title: "Co2/unit",
+      scenarios: [
+        {
+          scenarioName: portfolioName,
+          data: data[0].co2PerUnitPostRetrofit || "",
+        },
+      ],
+    },
+    {
+      title: "Energy bills/unit",
+      scenarios: [
+        {
+          scenarioName: portfolioName,
+          data: data[0].energyBillPerUnitPostRetrofit || "",
+        },
+      ],
+    },
+    {
+      title: "Energy consumption (kWh)/unit",
+      scenarios: [
+        {
+          scenarioName: portfolioName,
+          data: data[0].energyConsumptionPerUnitPostRetrofit || "",
+        },
+      ],
+    },
+    {
+      title: "Cost (£)",
+      scenarios: [
+        { scenarioName: portfolioName, data: formatNumber(data[0].cost || 0) },
+      ],
+    },
+    {
+      title: "Cost (£) /unit",
+      scenarios: [
+        { scenarioName: portfolioName, data: data[0].costPerUnit || "" },
+      ],
+    },
+    {
+      title: "£ per CO2 reduction",
+      scenarios: [
+        { scenarioName: portfolioName, data: data[0].costPerCo2Saved || "" },
+      ],
+    },
+    {
+      title: "£ per SAP point",
+      scenarios: [
+        { scenarioName: portfolioName, data: data[0].costPerSapPoint || "" },
+      ],
+    },
+    {
+      title: "Valuation improvement per unit",
+      scenarios: [
+        {
+          scenarioName: portfolioName,
+          data: data[0].valuationImprovementPerUnit || "",
+        },
+      ],
+    },
+    {
+      title: "Valuation return on investment",
+      scenarios: [
+        {
+          scenarioName: portfolioName,
+          data: data[0].valuationReturnOnInvestment || "",
+        },
+      ],
+    },
+  ];
+
+  return new NextResponse(JSON.stringify(output), {
+    status: 200,
+  });
+}