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0fec069988
ModellingOrchestrator builds the ventilation dependency per Property (suppressed when already mechanically ventilated) and passes it to optimise_package, so a selected wall measure forces MEV into the package before the re-score. Ventilation joins the role-3 cascade in best-practice order (walls -> roof -> ventilation -> floor) and persists as a Plan Measure carrying its real negative marginal and its cost. Added the mechanical_ventilation contingency rate (0.26, per legacy Costs.CONTINGENCIES). Integration test now seeds the ventilation Product and asserts the forced measure persists with <=0 SAP and 2x900 cost; the full-pipeline test seeds the Product too (the dependency is built for every not-yet-ventilated dwelling). On 000490 the real calculator scores MEV at -1.275 SAP. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
25 lines
883 B
Python
25 lines
883 B
Python
"""Per-Measure-Type contingency rates.
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The one cost component carried separately from a Product's fully-loaded total
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(CONTEXT.md). Mirrors the legacy `recommendations/Costs.py::Costs.CONTINGENCIES`;
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extended as each measure type lands.
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"""
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_CONTINGENCY_RATES: dict[str, float] = {
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"cavity_wall_insulation": 0.10,
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"loft_insulation": 0.10,
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"suspended_floor_insulation": 0.20,
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"solid_floor_insulation": 0.26,
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"mechanical_ventilation": 0.26,
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}
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def contingency_rate(measure_type: str) -> float:
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"""Return the contingency rate for a Measure Type, raising if unknown
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(strict — do not silently default, per the repo's strict-raise convention)."""
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try:
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return _CONTINGENCY_RATES[measure_type]
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except KeyError as exc:
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raise ValueError(
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f"no contingency rate configured for measure type {measure_type!r}"
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) from exc
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