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A pre-SAP10 RdSAP cert that omits per-window records lodges glazing as a
`multiple_glazing_type` code plus a `window.description` and a
`multiple_glazed_proportion`. When the numeric code is the "ND" (Not
Defined) sentinel, the reduced-field synthesis defaulted to the DG-modal
code 2 (double) — ignoring the two register signals that say otherwise.
`_normalize_sap_schema_16_x` already honours an explicit "Single glazed"
description for 16.x certs (rewriting multiple_glazing_type -> 5), but that
rule was never propagated to the 17.0 / 17.1 / 18.0 / 19.0 / 20.0.0
synthesis seams — they all blindly applied ND -> 2. So a genuinely
single-glazed dwelling was:
1. scored as double-glazed, overstating its baseline SAP, and
2. hidden from the glazing generator (which upgrades only single-glazed
windows), producing no glazing recommendation.
Reproduced on cert 2780-3922-3202-6042-9200 (uprn 10033526327), a
single-glazed community-heated flat lodging multiple_glazing_type="ND",
window "Single glazed", multiple_glazed_proportion 0 — mapped to four
double-glazed windows, no glazing measure offered.
Extend the 16.x rule to all five reduced-field seams via one shared
resolver: on the ND fallback, when the description says "single" or the
multiple-glazed proportion is 0, synthesise single glazing
(`_api_cascade_glazing_type(5) == 1`, SAP10 cascade single, Table 24
U~4.8) — the exact single code the glazing generator's {1, 15} set
matches — else keep each seam's DG-modal default. Refines ADR-0028's ND
handling.
Tests: all five seams synthesise single from a "Single glazed" + 0%
proportion cert; the double-glazed control keeps the DG-modal default;
plus unit pins on the resolver.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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| .. | ||
| domain | ||
| loaders | ||
| schema | ||
| search | ||
| surveys | ||
| __init__.py | ||
| construction_age_band.py | ||
| efficiency.py | ||
| floor.py | ||
| fuel.py | ||
| heating_controls.py | ||
| hotwater.py | ||
| main_heating.py | ||
| property_type_built_form.py | ||
| roof.py | ||
| walls.py | ||
| windows.py | ||