From “what's estimated?” to “what to verify first?”
before you spend.
Most energy advice is generic, paywalled, or trying to sell you something. Live today: a free estimated Health Score (public data + quick inputs), Passport evidence labels, and Architect concept-stage handoff. Portfolio multi-home is an illustrative demo plus a founder-led pilot — not certification and not self-serve multi-home SaaS.
Architects: design-stage briefs — planning aid, not a third homepage door.
The 3-part system
Estimated Health Score → known / estimated / missing → next high-impact facts to verify. No black box. Not an EPC.
Score (0–100)
Envelope, heating, ventilation, hot water, and storage are the five areas scored today. They combine into one 0–100. Solar: Not yet scored in the published Health Score (this component currently contributes 0). Solar's 12% is reserved and currently adds 0. With no certificate, the highest possible score today is about 88. With the EPC anchor, the highest possible score today is about 90. The Health Score is a number 0–100 with no letter. Evidence Grade A–D sits beside it and measures evidence, not the home.
Live PVGIS/OSM enrichment is not an input to this published number.
Incentives & Grants
We surface relevant incentives where reliable local data exists, and we label gaps clearly where regional support is still partial.
Coverage depth varies by market
Action Plan
A step-by-step plan with indicative bill impact, comfort context, and carbon reduction — with guardrails for sequencing. Insulate before you size a heat pump. Review storage and export assumptions before acting.
Sequenced • Confidence-aware
Why this isn't another EPC tool
Beyond EPC A
Government ratings stop at A. Our 0–100 Health Score covers envelope, heating, ventilation, hot water, and storage — always labeled estimated until verified. Solar: Not yet scored in the published Health Score (this component currently contributes 0). Solar's 12% is reserved and currently adds 0. With no certificate, the highest possible score today is about 88. With the EPC anchor, the highest possible score today is about 90. Not a promise of export income or programme enrolment.
Continuous, not stepped
EPC uses letter bands with cliff edges. We use smooth scoring curves and published component weights so small fabric improvements move the score continuously — not letter cliffs. Curves still encode modelling assumptions; site-specific physics (e.g. measured U-values) may be missing and is labelled estimated until verified.
Open methodology
Methodology, major assumptions, published score weights, and known limits are documented. Not every internal formula or private research source is open yet — we publish what we claim, and we label estimates and missing data.
Evidence hierarchy, not hype counts
Public methodology prioritises government publications, formal standards (including SAP/RdSAP and planned HEM), peer-reviewed research, field trials, and named professional review — with transparent source dates. Media is discovery input only, not a headline trust claim.
How we improve safely
Evolving Home runs automated nightly checks on improvement proposals so inaccurate or hype-filled suggestions are caught before approved changes go live. Major methodology updates need human review — we do not silently rewrite how your indicative score works.
Your Passport stays yours
Your home facts live in your Passport. We do not use your data to train public models.
Nightly automated checks
Every night we run automated accuracy checks on proposed copy and claims before suggestions are promoted.
Quality guardrails
Hype phrases, missing evidence, and overconfident claims are blocked from promotion.
Humans approve big changes
Methodology and scoring changes need human review. We do not auto-change how your indicative score works.
- ✓Hundreds of automated accuracy checks run nightly
- ✓Evidence cited or uncertainty stated — no hype guarantees
- ✓How verified research reaches your score →