Twenty-one instant screening tools built on official data — a full site constraints appraisal, extension permitted development, green belt, council lookup, flood, fees, daylight, carbon and biodiversity net gain. No sign-up, no email gate.
Every tool on this page answers a real screening question a UK planning application raises. Each one links to a guide explaining the method behind it, and every factor and boundary it uses comes from an official source — the Environment Agency, Defra, BRE, SAP 10.2, the MHCLG fee schedule and GOV.UK guidance. When a tool flags a risk, the matching report service turns the answer into something you can submit.
Jump straight to a tool
Postcode in, Environment Agency flood zone out — with what it means for your application.
This checker needs JavaScript — or use the official Flood Map for Planning.
Guide: what flood zone am I in? · Data: England flood risk statistics 2026
Combines your flood zone with the NPPF vulnerability classification to tell you if your use is appropriate, needs the Exception Test, or should not be permitted.
This checker needs JavaScript — the rules are in the PPG flood risk guidance.
Guide: can I build in a flood zone?
Is your site inside a declared Air Quality Management Area?
This checker needs JavaScript — or browse AQMAs on Defra UK-AIR.
Guide: AQMA checker · Data: how many AQMAs are there in 2026?
Screen a window against the BR 209 (2022) VSC and APSH tests.
This calculator needs JavaScript — the tests are explained in our daylight targets reference.
Guide: daylight calculator · Reference: BRE 2022 daylight tables
Compare heating carbon with the SAP 10.2 factors behind Part L 2021.
This calculator needs JavaScript — the factors are explained in our heat pump statistics guide.
Guide: heat pump carbon calculator · Data: UK heat pump statistics
Do you need planning permission for an air source heat pump under the 2025 rules?
This checker needs JavaScript — the rules are in our permitted development guide.
What a biodiversity-unit shortfall costs at official 2026 prices, with the ×2 spatial multiplier.
This calculator needs JavaScript — the official price list is on GOV.UK.
Guide: BNG credit calculator · Analysis: statutory credit prices 2026
Six questions plus live flood-zone and AQMA lookups → the documents your application is likely to need.
This tool needs JavaScript — see the checklist guide.
Guide: what documents do you need?
The fees effective 1 April 2026, from the official MHCLG schedule — householder to major schemes.
This tool needs JavaScript — fees are on GOV.UK.
Guide: 2026 fee guide
Minimum gross internal areas and bedroom sizes for new dwellings (NDSS).
This tool needs JavaScript — the table is in the official standard.
Guide: minimum room sizes
Current use → proposed use: no permission, prior approval, or full application.
This tool needs JavaScript — classes on the Planning Portal.
Guide: change of use explained
Does mandatory 10% biodiversity net gain apply — including the 6 August 2026 small-sites change?
This tool needs JavaScript — exemptions on GOV.UK.
Guide: BNG exemptions
Will an extension cross the 45° line — or the BRE 25° daylight screen?
This tool needs JavaScript — see the 45-degree guide.
Guide: the 45-degree rule
Solar geometry on BRE's overshadowing test day, for any UK latitude.
This tool needs JavaScript — see the shadow guide.
Guide: 21 March overshadowing
8/13/16-week determination periods and the 12-week / 6-month appeal windows, as dates.
This tool needs JavaScript — see the deadline guide.
Guide: planning deadlines
Annual shortfall × 30 years × your borough's price (£95 GLA default).
This tool needs JavaScript — see the offset guide.
Guide: what a shortfall costs
Live zone lookup plus the five national FRA triggers — with the reasons spelled out.
This tool needs JavaScript — rules on GOV.UK.
Guide: FRA triggers explained
One postcode → 14 official datasets: green belt, conservation areas, article 4, listed buildings, SSSIs, monuments, flood zones, AQMAs and more.
This tool needs JavaScript — see the constraints guide.
Guide: instant site appraisal
The real Class A and Class E limits — rear depths, prior approval routes, side rules, outbuildings, the 50% rule.
This tool needs JavaScript — the limits are in the official guidance.
In or out of England's green belt — and what a "yes" means for extensions vs new homes.
This tool needs JavaScript — see the green belt guide.
Postcode → your local planning authority, ward and region, with a direct link to its planning application register.
This tool needs JavaScript — or use GOV.UK's register finder.
Guide: council planning search
Planning-ready reports: flood risk · air quality · energy · sustainability — plus professional daylight & sunlight reports.
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