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Khalim Conn-Kowlessar 6455d48b9d Elmhurst SAP10.2 worksheet conformance: §1/§2/§3 + 6 fixtures + README 
Lands real-cert ground-truth conformance tests for the SAP10.2 worksheet,
asserting our §1 dimensions, §2 ventilation, and §3 heat-transmission
output line-by-line against six Elmhurst-lodged worksheets (000474,
000477, 000480, 000487, 000490, 000516). Each fixture covers a distinct
shape: with/without room-in-roof, single-part vs main+extensions, age
A and B, party-wall U=0.0 vs U=0.25, 1/2/3 sheltered sides, varying
draught-proofing %, and the (12) suspended-timber quirk.

§1/§2/§3 module updates back the new line-refs (LINE_31 external-element
area, LINE_33 fabric loss, LINE_37 total fabric loss; per-fixture (12)
floor / (15) window / (21) shelter-adjusted ach; SapRoomInRoof storey
contribution via the 2.45 m §3.9.1 convention).

The §3 test currently asserts invariants only ((33) = Σ per-element,
(37) = (33) + (36)) because SapRoomInRoof only carries floor_area —
gable/slope/stud/flat-ceiling sub-areas the worksheet itemizes are not
yet modelled. LINE_3* constants capture the worksheet ground truth for
when that gap closes.

Adds a SAP-domain README with a step-by-step guide for adding new
Elmhurst fixtures from the assessor's PDF pair (Summary + worksheet),
including the field-by-field cert → EpcPropertyData mapping table and
the gotchas surfaced across the six fixtures (storey-height +0.25
convention, party-wall U code mapping, has_suspended_timber_floor flag
truth table, (25) effective-ach formula, Energy Rating vs EPC Costs
wind-speed trap).

366 tests pass (was 360 pre-pairs 5-6).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-20 09:48:30 +00:00
..
domain Elmhurst SAP10.2 worksheet conformance: §1/§2/§3 + 6 fixtures + README 2026-05-20 09:48:30 +00:00
fetchers added potential file scaffolding: 2026-05-15 10:56:53 +00:00
repos added potential file scaffolding: 2026-05-15 10:56:53 +00:00
utils added potential file scaffolding: 2026-05-15 10:56:53 +00:00
README.md added potential file scaffolding: 2026-05-15 10:56:53 +00:00

README.md

Shared packages

Workspace packages consumed by services/*. Each package is its own Python distribution with its own pyproject.toml; services import via the workspace dependency mechanism ({ workspace = true }).

Package Purpose
domain/ Shared domain types — Property, BaselinePerformance, Plan, Scenario, EpcPropertyData, etc. No persistence, no IO, no business logic.
repos/ Persistence layer — one repo per aggregate. Owns the SQL. Depends on domain.
fetchers/ External API clients (gov EPC, Ofgem, Google Solar, etc.). Depend on domain for response shapes.
utils/ Cross-cutting infra — logging, S3, CloudWatch URL builders, SQS task helpers.

Adding a new shared package

Only when a real second consumer materialises. Don't pre-shatter (repos-epc, repos-property, ...) — split when a deployment needs to drop a dep, not before.

See ../ara_backend_design.md §11 for the broader monorepo layout and ../CONTEXT.md for the domain glossary that names the types living in domain/.