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Flat per-dwelling decommission price (sample_catalogue \£250) + 0.25 contingency (covers unknown heater count / hard-wired-vs-plugged / repaint extent). The JSON repo joins the contingency from config, proven by the new repo test. No composite Products machinery — a lodged secondary is one roughly-fixed job, not room-scaled. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
42 lines
1.5 KiB
Python
42 lines
1.5 KiB
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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"sloping_ceiling_insulation": 0.10,
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"flat_roof_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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"external_wall_insulation": 0.26,
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"internal_wall_insulation": 0.26,
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"double_glazing": 0.15,
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"secondary_glazing": 0.15,
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"low_energy_lighting": 0.26,
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"high_heat_retention_storage_heaters": 0.10,
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"air_source_heat_pump": 0.25,
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"gas_boiler_upgrade": 0.26,
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"system_tune_up": 0.10,
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"system_tune_up_zoned": 0.10,
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"solar_pv": 0.15,
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# Decommissioning a fixed secondary heater + localised making-good is small,
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# uncertain work: the rate covers the unknown heater count / hard-wired vs
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# plugged status / repaint extent (ADR-0028).
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"secondary_heating_removal": 0.25,
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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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