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Design nature on a real site. See the return in 60 seconds.

Drop a UK postcode or pick a Golden Scenario. The same heat, runoff, biodiversity and Green Book engines we ship in production turn your sketched interventions into a sourced, pounds-avoided return — no workspace, no signup.

Try your own location · 60 seconds

Drop any UK postcode or address. Get a candidate quantified return — pounds avoided — on the screen.

We hash the address into representative climate, soil and population layers, run the same engines we ship in production, and surface a single decision-ready figure. Nothing is stored.

Demo only — uses representative layers, not your live cadastral data. Sign up for a real workspace to plug in your own geometry.

What you’re looking at
Marylebone · London, UK

A real Marylebone site, designed with nature-based interventions. The numbers below update as if you’d drawn them yourself — the headline is the quantified annual return in pounds avoided.

See the valuation method
Quantified return · annual
£3.14M
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Vitality Audit
Proposed interventions
Mini-Forest (Miyawaki) · 1,800 m²Bioswale · 1.1 kmGreen Roof · 9,400 m²
Headline
+0.42 vegetation density
Five-year modelled uplift across the catchment
Quantified return · pounds avoided / yr
£3.14M
Stormwater retained
82%
PM2.5 reduction
−18%
Wellbeing-years gained / yr
1,240
Carbon sequestered
184 tCO₂e/yr
Aligned to
UK Environment Act 2021 — Biodiversity gainLondon Plan G5HM Treasury Green Book
Magic Moment — live PDF preview
Data view

Vitality Audit — London Marylebone

Problem. Vegetation density is low (NDVI 0.21) across a 14 ha conservation area. PM2.5 exceeds WHO limits 184 days a year, and NHS records 2,400 anxiety-related GP visits in the catchment.

Urban Nature Audit solution. Three pocket mini-forests (Miyawaki method), 1.1 km bioswale on Wigmore Street, and a green-roof retrofit programme across 18 commercial roofs.

Defra Biodiversity Net Gain Metric 4.0 (2024)
HM Treasury Green Book — WELLBY (2021)
Schirone et al. (2011) Miyawaki succession
Urban Nature Audit · UrbanCat
Marylebone
London, UK
Headline
£3.14M
quantified return · pounds avoided / yr
Stormwater retained
82%
PM2.5 reduction
−18%
Wellbeing-years gained / yr
1,240
Carbon sequestered
184 tCO₂e/yr
£3.14M avoided cost · validated wellbeing uplift. Methodology: UK Environment Act 2021 — Biodiversity gain · London Plan G5 · HM Treasury Green Book.
Generated 6/29/2026 · Climate via Open-Meteo · Biodiversity via GBIF
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Next step

Book a working session with our research team

We'll spin up a private workspace seeded with your portfolio's geometry, climate and policy frame — usually within 48 hours.

© UrbanCat · Sandpit fixtures are for demonstration only.
Real workspaces: ~120s to first report.