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+# Hyde portfolio 796 — UNKNOWN overrides for review
+
+After ChatGPT classification, **19 distinct descriptions** did not auto-resolve (out of ~440 distinct across all components). Grouped below with a **proposed value** (must be one of the allowed enum values) + the row count it affects. Nothing is written to the DB until these are confirmed.
+
+## 1. construction_age_band — 29,829 rows (DETERMINISTIC, no judgement)
+
+The classifier didn't extract the band letter in batch, but the band IS the leading letter, so these are mapped mechanically (`"D: 1950-1966"` → `D`). Just confirm the approach.
+
+| description | → band | rows |
+|---|---|---|
+| D: 1950-1966 | `D` | 4,978 |
+| K: 2007-2011 | `K` | 4,201 |
+| I: 1996-2002 | `I` | 3,708 |
+| B: 1900-1929 | `B` | 3,222 |
+| H: 1991-1995 | `H` | 2,747 |
+| E: 1967-1975 | `E` | 2,479 |
+| J: 2003-2006 | `J` | 2,221 |
+| F: 1976-1982 | `F` | 2,071 |
+| C: 1930-1949 | `C` | 1,840 |
+| G: 1983-1990 | `G` | 1,615 |
+| A: pre-1900 | `A` | 615 |
+| M: 2023 onwards | `M` | 132 |
+
+## 2. roof_type (flat roofs) — 1,473 rows (NEEDS KHALIM'S CALL)
+
+Flat-roof insulation drives the SAP roof U-value. **`Flat: As Built` (1,172) + `Flat: Unknown` (194) are the load-bearing decision** — proposed conservatively as *no insulation (assumed)*.
+
+| description | proposed value | rows | alt options |
+|---|---|---|---|
+| Flat: As Built | `Flat, no insulation (assumed)` | 1,172 | Flat, insulated (assumed) / Flat, limited insulation (assumed) / Flat, no insulation (assumed) |
+| Flat: Unknown | `Flat, no insulation (assumed)` | 194 | Flat, insulated (assumed) / Flat, limited insulation (assumed) / Flat, no insulation (assumed) |
+| Flat: 150mm | `Flat, insulated` | 59 | Flat, insulated (assumed) / Flat, limited insulation (assumed) / Flat, no insulation (assumed) |
+| Flat: 100mm | `Flat, insulated` | 32 | Flat, insulated (assumed) / Flat, limited insulation (assumed) / Flat, no insulation (assumed) |
+| Flat: 50mm | `Flat, limited insulation` | 13 | Flat, insulated (assumed) / Flat, limited insulation (assumed) / Flat, no insulation (assumed) |
+| SameDwellingAbove | `(same dwelling above)` | 3 | Flat, insulated (assumed) / Flat, limited insulation (assumed) / Flat, no insulation (assumed) |
+
+## 3. wall_type — 7 rows
+
+| description | proposed value | rows |
+|---|---|---|
+| TimberFrame: Internal | `Timber frame, with additional insulation` | 7 |
+
+## How to apply after review
+
+Edit the `corrected_value` column of `overrides_edits.csv`, then:
+
+```
+python scripts/hyde/build_property_overrides.py validate    --edits overrides_edits.csv
+python scripts/hyde/build_property_overrides.py apply-edits --edits overrides_edits.csv --portfolio-id 796 --apply
+python scripts/hyde/build_property_overrides.py write       --excel scripts/hyde/hyde_property_overrides.xlsx --portfolio-id 796 --apply
+```
+
+> Note: a proper fix for the age classifier (a prompt hint so the production lambda extracts the band letter) is a separate follow-up; these script edits handle this run.
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