Three zones. One continuous risk score.
For every compliance item on every property, LetScope calculates a risk contribution based on its position relative to the deadline (τ). The total CRS is the sum across all active items — giving a single, quantified risk number per property.
Latency — Safe window
The item is well within its deadline. No risk is registered. The landlord has time to act without urgency.
Proximity ramp — Risk rising
The deadline is within the proximity window. Risk rises linearly as the deadline approaches. Early action prevents the breach shock jump.
Post-breach — Escalating
The deadline has passed. An instant shock is applied and risk grows each day — modelling accumulating enforcement and financial exposure.
From data to decision
The CRS sits within a three-layer stack. Each layer builds on the previous one. Layers 2 and 3 are not available in any existing UK PRS compliance product.
Parameter summary — all compliance items
Each compliance item is assigned four parameters determining its risk contribution. Values shown are the current indicative model, grounded in UK PRS legislation.
| Compliance item | Bᵢ | Mᵢ | Pᵢ | Vᵢ | Primary legal source | Official reference |
|---|---|---|---|---|---|---|
| Gas Safety CertificateCP12 / LGSR | 10 | 5 | 30d | 2.0 | Gas Safety (Installation and Use) Regulations 1998 (SI 1998/2451)Unlimited fine & up to 6 months imprisonment · annual cycle | hse.gov.uk — landlord FAQ |
| EICRElectrical Installation Condition Report | 9 | 4.5 | 60d | 1.5 | Electrical Safety Standards in the PRS (England) Regulations 2020Max penalty £40,000 from Nov 2025 · 5-year cycle | gov.uk — electrical safety |
| Right to RentImmigration Act 2014 | 8 | 5 | 21d | 2.0 | Immigration Act 2014 s.22 · Right to Rent Code of Practice (Feb 2024)Up to £20,000/occupier repeat breach · up to 5 yrs imprisonment | gov.uk — code of practice |
| Fire & Smoke DetectorsSmoke & CO alarms | 8 | 3.5 | 30d | 1.0 | Smoke and Carbon Monoxide Alarm (England) Regulations 2015 (amended 2022)£5,000 penalty · up to £30,000 for HMOs · test on tenancy start | legislation.gov.uk — SI 2015/1693 |
| Deposit ProtectionTDP scheme — 30-day deadline | 7 | 4 | 14d | 2.5 | Housing Act 2004 ss.212–215 · Tenancy Deposit Protection rulesPenalty 1–3× deposit amount · blocks Section 21 | gov.uk — deposit protection |
| Legionella AssessmentWater risk assessment | 6 | 3 | 60d | 0.8 | Health and Safety at Work Act 1974 s.3 · COSHH Regulations 2002 · HSE ACOP L8No fixed penalty · 2-year review cycle · unlimited fine if harm occurs | hse.gov.uk — legionella |
| EPCEnergy Performance Certificate | 5 | 2 | 90d | 0.5 | Energy Performance of Buildings Regulations 2012 · MEES Regulations 2018Max £5,000 civil penalty · 10-year validity · Band E min (Band C by 2030) | gov.uk — MEES guidance |
| HMO LicenceHouse in Multiple Occupation | 10 | 6 | 90d | 2.0 | Housing Act 2004 ss.61–74 · Housing and Planning Act 2016Criminal offence · unlimited fine · rent repayment orders · 5-year cycle | gov.uk — HMO licence |
| All parameters are calibrated from UK PRS legislation and enforcement data. Final LetScope calibration is proprietary. | ||||||
Items with red Bᵢ badges (8–10) carry the highest base severity — Gas Safety, EICR, Right to Rent, Fire Detectors, and HMO Licence. These carry criminal liability, safety risk, or both.
Items with high Mᵢ values (5–6) see the largest score jump at the moment of breach — the "shock" when τ crosses zero.
The Pᵢ proximity window determines how far in advance LetScope alerts. Deposit Protection (14d) is fast-moving; EPC and HMO (90d) need longer lead time for renewals.
Deposit Protection has the highest Vᵢ (2.5) — post-breach risk accumulates fastest, reflecting compound financial penalties under tenancy deposit law.