diff --git a/scripts/profile_case34.py b/scripts/profile_case34.py
new file mode 100644
index 00000000..21484cc2
--- /dev/null
+++ b/scripts/profile_case34.py
@@ -0,0 +1,95 @@
+"""Decompose simulated case 34 (electric-storage corridor flat) vs its
+dr87/P960 worksheet, channel by channel.
+
+Routes the tracked fixture
+`backend/documents_parser/tests/fixtures/Summary_case34_storage_flat.pdf`
+through extractor -> mapper -> calculator (Summary path) and prints the §3
+heat-transmission breakdown + the space-heating demand / ventilation /
+gains / MIT intermediates against the worksheet line refs.
+
+The fabric (33), bridging (36), (31) and the door channel are EXACT after
+HEAD c10881ae. The +46.3 kWh/yr (+0.41%) space-heating over-count was the
+§2 (13) draught lobby: a corridor flat assumes a lobby (0.0), not the 0.05
+no-lobby penalty (RdSAP 10 spec p.30) — closed at HEAD 450e33e1, which lands
+effective air change (25)m on the worksheet (avg 0.6024) and SAP at 35.3130
+vs ws 35.3094 (Δ +0.0036, sub-2dp-rounding). The residual now sits at the
+worksheet's own 2dp display floor (walls -0.017 W/K). Use this to audit.
+
+    PYTHONPATH=/workspaces/model python scripts/profile_case34.py
+"""
+import re
+import subprocess
+from pathlib import Path
+
+from backend.documents_parser.elmhurst_extractor import ElmhurstSiteNotesExtractor
+from datatypes.epc.domain.mapper import EpcPropertyDataMapper
+from domain.sap10_calculator.calculator import calculate_sap_from_inputs
+from domain.sap10_calculator.rdsap.cert_to_inputs import (
+    SAP_10_2_SPEC_PRICES,
+    cert_to_inputs,
+    heat_transmission_section_from_cert,
+)
+
+_FIXTURE = (
+    Path(__file__).parent.parent
+    / "backend/documents_parser/tests/fixtures/Summary_case34_storage_flat.pdf"
+)
+
+
+def _pages(pdf: Path) -> list[str]:
+    info = subprocess.run(
+        ["pdfinfo", str(pdf)], capture_output=True, text=True, check=True
+    ).stdout
+    pc = int(re.search(r"Pages:\s+(\d+)", info).group(1))  # type: ignore[union-attr]
+    pages: list[str] = []
+    for i in range(1, pc + 1):
+        layout = subprocess.run(
+            ["pdftotext", "-layout", "-f", str(i), "-l", str(i), str(pdf), "-"],
+            capture_output=True, text=True, check=True,
+        ).stdout
+        toks: list[str] = []
+        for line in layout.splitlines():
+            if not line.strip():
+                toks.append("")
+                continue
+            toks.extend([p for p in re.split(r"\s{2,}", line.strip()) if p])
+        pages.append("\n".join(toks))
+    return pages
+
+
+def main() -> None:
+    sn = ElmhurstSiteNotesExtractor(_pages(_FIXTURE)).extract()
+    epc = EpcPropertyDataMapper.from_elmhurst_site_notes(sn)
+    ht = heat_transmission_section_from_cert(epc)
+    print("== §3 HEAT TRANSMISSION (all EXACT at c10881ae) ==")
+    print(f"(31) ext elem area = {ht.total_external_element_area_m2:.4f} | ws 120.369")
+    print(f"(29a) walls        = {ht.walls_w_per_k:.4f} | ws 30.902")
+    print(f"(30) roof          = {ht.roof_w_per_k:.4f} | ws 91.954")
+    print(f"(28a) floor        = {ht.floor_w_per_k:.4f} | ws 27.986")
+    print(f"(26) doors         = {ht.doors_w_per_k:.4f} | ws 8.14 (corridor 1.4 + ext 3.0)")
+    print(f"(33) fabric        = {ht.fabric_heat_loss_w_per_k:.4f} | ws 207.484")
+    print(f"(36) bridging      = {ht.thermal_bridging_w_per_k:.4f} | ws 18.054")
+    print(f"(37) total fabric  = {ht.total_w_per_k:.4f} | ws 225.538")
+
+    res = calculate_sap_from_inputs(cert_to_inputs(epc, prices=SAP_10_2_SPEC_PRICES))
+    im = res.intermediate
+    print("\n== RESIDUAL CLOSED at 450e33e1: was +46.3 kWh, now -0.96 kWh ==")
+    keys = [
+        "useful_space_heating_kwh_per_yr",       # ws (98) = 11357.24
+        "infiltration_ach", "infiltration_w_per_k",
+        "internal_gains_annual_avg_w",           # ws (73)/(84)
+        "mean_internal_temp_annual_avg_c",       # ws (85)-(93)
+    ]
+    for k in keys:
+        if k in im:
+            print(f"  {k} = {round(im[k], 4)}")
+    print(
+        "\nworksheet targets: (98) space heat=11357.24 | (35) TMP=250 |"
+        " (25)m eff ach 0.46-0.64 | (20) shelter=0.85 | (19) sheltered sides=2"
+    )
+    print(f"\nSAP cont = {res.sap_score_continuous:.4f} | ws 35.3094 | "
+          f"Δ = {res.sap_score_continuous - 35.3094:+.4f}")
+
+
+if __name__ == "__main__":
+    main()