Give children and couples who cannot share a bedroom their own bedrooms in the LHA size criteria

changelog.d/2069.fixed.md

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+- Give children and couples who cannot share a bedroom because of disability their own bedrooms in the LHA size criteria (UC Regs 2013 Sch 4 para 12(6), (6A), (8), (9)(c)-(d); HB Regs 2006 and HB (SPC) Regs 2006 reg 13D(3)(za), (zb), (ba)), with the new input `cannot_reasonably_share_bedroom_due_to_disability`. A child under 16 on the DLA care component at the middle or highest rate who cannot reasonably share is left out of the children's pairing and has a room of their own, so a room is added only where the child would otherwise share. A couple one of whom cannot share (on attendance allowance, armed forces independence payment, DLA care at the middle or highest rate or PIP daily living; attendance allowance only at the higher rate before 27 January 2025) has a bedroom each: for Universal Credit the renter's couple, for Housing Benefit any couple of occupiers. Housing Benefit allows these bedrooms only where the dwelling has them (`num_bedrooms`; assumed where not reported). In force from 4 December 2013 (children) and 1 April 2017 (couples).

policyengine_uk/parameters/gov/dwp/LHA/cannot_share_bedroom/child/benefits.yaml

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+description: Disability benefits a child must receive to be a child who cannot share a bedroom in the LHA size criteria. The law also lists the care component of child disability payment at the middle or highest rate (Scotland), which the model has no variable for.
+values:
+  2013-12-04:
+    - dla_sc_middle_plus
+metadata:
+  unit: list
+  label: LHA child who cannot share qualifying benefits
+  reference:
+    - title: Universal Credit Regulations 2013 Sch 4 para 12(6)(a)
+      href: https://www.legislation.gov.uk/uksi/2013/376/schedule/4/paragraph/12
+    - title: Housing Benefit Regulations 2006 reg 2(1), "child who cannot share a bedroom"
+      href: https://www.legislation.gov.uk/uksi/2006/213/regulation/2
+    - title: Housing Benefit (State Pension Credit) Regulations 2006 reg 2(1), "child who cannot share a bedroom"
+      href: https://www.legislation.gov.uk/uksi/2006/214/regulation/2

policyengine_uk/parameters/gov/dwp/LHA/cannot_share_bedroom/child/in_effect.yaml

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+description: Whether a child who cannot share a bedroom because of disability has a bedroom of their own in the LHA size criteria.
+values:
+  2011-04-01: false
+  2013-12-04: true
+metadata:
+  unit: bool
+  label: LHA bedroom for a child who cannot share in effect
+  reference:
+    - title: Housing Benefit and Universal Credit (Size Criteria) (Miscellaneous Amendments) Regulations 2013 (SI 2013/2828) regs 2(4), 3(3) and 4(3)
+      href: https://www.legislation.gov.uk/uksi/2013/2828/made

policyengine_uk/parameters/gov/dwp/LHA/cannot_share_bedroom/couple_member/benefits.yaml

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+description: Disability benefits a member of a couple must receive to be a member of a couple who cannot share a bedroom in the LHA size criteria. Attendance allowance counted only at the higher rate until 27 January 2025. The law also lists the Scottish devolved equivalents (child disability payment, adult disability payment, Scottish adult disability living allowance, pension age disability payment), which the model has no variables for.
+values:
+  2017-04-01:
+    - receives_higher_rate_attendance_allowance
+    - armed_forces_independence_payment
+    - dla_sc_middle_plus
+    - pip_dl
+  2025-01-27:
+    - attendance_allowance
+    - armed_forces_independence_payment
+    - dla_sc_middle_plus
+    - pip_dl
+metadata:
+  unit: list
+  label: LHA member of a couple who cannot share qualifying benefits
+  reference:
+    - title: Universal Credit Regulations 2013 Sch 4 para 12(6A)(a)
+      href: https://www.legislation.gov.uk/uksi/2013/376/schedule/4/paragraph/12
+    - title: Universal Credit Regulations 2013 reg 2, "attendance allowance" (includes armed forces independence payment)
+      href: https://www.legislation.gov.uk/uksi/2013/376/regulation/2
+    - title: Housing Benefit Regulations 2006 reg 2(1), "member of a couple who cannot share a bedroom"
+      href: https://www.legislation.gov.uk/uksi/2006/213/regulation/2
+    - title: Housing Benefit (State Pension Credit) Regulations 2006 reg 2(1), "member of a couple who cannot share a bedroom"
+      href: https://www.legislation.gov.uk/uksi/2006/214/regulation/2
+    - title: Social Security (Miscellaneous Amendments) Regulations 2025 (SI 2025/3) regs 3-5 (attendance allowance at any rate from 27 January 2025)
+      href: https://www.legislation.gov.uk/uksi/2025/3/made

policyengine_uk/parameters/gov/dwp/LHA/cannot_share_bedroom/couple_member/in_effect.yaml

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+description: Whether a couple one of whom cannot share a bedroom with the other because of disability has a bedroom each in the LHA size criteria.
+values:
+  2011-04-01: false
+  2017-04-01: true
+metadata:
+  unit: bool
+  label: LHA bedroom for a member of a couple who cannot share in effect
+  reference:
+    - title: Housing Benefit and Universal Credit (Size Criteria) (Miscellaneous Amendments) Regulations 2017 (SI 2017/213) regs 4, 5 and 6
+      href: https://www.legislation.gov.uk/uksi/2017/213/made