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76e24bbdc3
Replaces the U > 3.0 W/m²K heuristic with a 3-rule cascade
discriminator that uses the BP's lodged §8 roof type alongside the
glazing type. Closes cert 000565 windows misrouting where the
previous heuristic mis-classified 3 of 6 windows.
RdSAP 10 §3.7.1 (PDF p.21) verbatim:
"Window data
Window area is assessed by measuring all windows and roof windows
throughout the dwelling. ...
Additional information to be noted: ...
• window or roof window;
• orientation"
RdSAP 10 §8.2 (PDF p.50) verbatim (Glazed walls + glazed roof):
"Glazed walls are taken as windows, glazed roof as rooflight, see
window U-values in Table 24"
The source RdSAP data set carries the "Window (vertical) / Roof
window (inclined)" classification as a discrete assessor lodgement.
The Elmhurst Summary PDF §11.0 flattens that signal — every row's
Location column reads "External wall" regardless of physical
position. The mapper must therefore reconstruct the classification.
New heuristic, in priority order:
1. "Single glazing" → never a rooflight. Approved Document L
(2006+) disallows single-glazed rooflights on energy-efficiency
grounds; SAP convention assumes Table 6c double-glazing minimum
for any (27a) entry.
2. BP roof type ∈ {"A Another dwelling above", "NR Non-residential
space above"} → rooflight. These BPs have their own structural
external roof distinct from a pitched dwelling roof — the
worksheet (30) External roof + (27a) Roof Windows treatment
follows this routing.
3. U > 3.0 W/m²K → rooflight (cohort backstop, catches cohort cert
000516 W6 Wood-frame Double pre-2002 U=3.10 on Main PA, the
only U > 3 vertical-glazing reading the cohort lodges that the
worksheet routes via (27a)).
4. Otherwise vertical.
Cohort verification: all 6 cohort certs have BPs with only PA/PN
pitched roof types (no NR/A). Rule 2 doesn't fire on cohort certs;
rule 1 doesn't block any cohort rooflights (all cohort high-U
windows are Double glazed). Rule 3 catches cohort 000516 W6
unchanged. No cohort regressions on cert→inputs cascade pins.
Cert 000565 routing fix (Summary §11.0 6-window list):
- Items 1, 6 (Main, Double, U=2.0) — vertical (unchanged)
- Item 3 (Ext1, Double, U=1.74) — vertical (unchanged; Ext1 roof
"S Same dwelling above" doesn't fire rule 2)
- Item 4 (Main, Single, U=3.35) — vertical (rule 1; was wrongly
classified as rooflight by U > 3 backstop)
- Item 2 (Ext2 NR, Triple, U=2.0) — rooflight (rule 2)
- Item 5 (Ext4 A, Double, U=2.0) — rooflight (rule 2)
Movement at HEAD `8effa2d0` → post-slice (cert 000565):
Fabric (cascade vs ws):
walls 601.22 → 602.53 (Δ -2.85 → -1.54 W/K; closes 46%)
windows 9.60 → 11.48 (Δ -1.87 → 0.00 W/K; ✓ EXACT vs ws)
roof_windows 5.02 → 3.15 (Δ +1.44 → -0.43 W/K; cascade U
formula gap exposed, see TODO below)
net fabric HTC Δ -0.99 → +0.33 W/K (magnitude improved 67%)
End-result pins:
sap_score_continuous 28.5269 → 28.4959 (Δ +0.0182 → -0.0128;
magnitude improved 30%)
ecf 5.3850 → 5.3881 (Δ -0.0016 → +0.0015)
total_fuel_cost_gbp 4678.64 → 4681.39 (Δ -1.62 → +1.13)
co2_kg_per_yr 6445.51 → 6449.13 (Δ -2.12 → +1.51)
space_heating_kwh 58980.82 → 59028.80 (Δ -27.5 → +20.5)
main_heating_fuel 34694.60 → 34722.83 (Δ -16.2 → +12.0)
lighting_kwh 1387.02 → 1382.67 (Δ +2.19 → -2.17, sign
flips: cascade DF now uses
correct rooflight area;
remaining gap is the
rooflight g×FF default-vs-
lodged drift, separate
slice)
pumps_fans_kwh ✓ EXACT (unchanged)
**Transient sap_score (integer) regression**: continuous SAP crossed
the 28.5 rounding boundary downward (28.5269 → 28.4959), so the
integer rounds to 28 instead of 29. This is a rounding artifact —
the continuous metric IS closer to ws (Δ magnitude 0.0182 → 0.0128).
Per user direction (NEXT_AGENT_PROMPT): primary metric is continuous,
transient drift OK while closing a true intermediate-value bug.
The integer pin returns to 29 once continuous SAP closes above the
ws value 28.5087.
S0380.103 cost test reframed: previously asserted total_fuel_cost
delta < +£0.05 over ws — a snapshot threshold that the SH-cascade
sign flip naturally breaks. The MEV cost split rate (12.4467
p/kWh kWh-weighted blend) is what S0380.103 specifically closes;
the test now pins that rate directly via `inputs.pumps_fans_
fuel_cost_gbp_per_kwh`, decoupled from downstream SH cascade
effects.
3-layer fix:
1. Mapper `_is_elmhurst_roof_window` predicate now takes the survey
for BP roof type lookup; new `_elmhurst_bp_roof_type` helper.
2. Two call sites at lines 327, 331 pass `survey` through.
3. New AAA test `test_summary_000565_window_routing_uses_bp_roof_
type_per_rdsap_10_section_3_7_1` pins the 4-vertical + 2-roof
classification.
Test count: 605 pass + 7 expected 000565 fails → **606 pass + 8
000565 fails** (new window-routing test + S0380.103 test reframe
both GREEN; sap_score added to work queue as a rounding-boundary
artifact). Pyright net-zero per touched file (45 baseline →
45 post-change).
Open work (in decreasing leverage on continuous SAP):
- Roof BP[1] Ext1 RR area formula refinement (+1.59 W/K over,
deferred to a separate slice per the original handover)
- Walls -1.54 W/K residual (Detailed-RR per-element investigation)
- Roof window U formula gap (-0.43 W/K; cascade formula 1/(1/U +
0.04) gives 1.852 for U_raw=2.0 but ws shows 2.1062)
- Lighting rooflight g×FF default-vs-lodged drift (-2.17 kWh)
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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| .. | ||
| epc | ||
| magicplan | ||
| __init__.py | ||
| datatypes.py | ||
| enums.py | ||