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Before committing time or money to a site, screen it against this checklist of the constraints that most commonly affect UK property and development decisions.
Most costly site mistakes don't come from a single glaring issue — they come from checking the obvious constraints (perhaps flood risk, or an obvious conservation area) and missing something less visible, like a coal mining risk area or an Article 4 Direction that removes permitted development rights. Working through constraints in a fixed order, every time, closes that gap and makes due diligence repeatable across a team rather than dependent on one person's memory.
If you only have a few minutes before deciding whether a site is worth pursuing further, prioritise the constraints most likely to make a site undevelopable or dramatically change its value: planning designations (Green Belt, AONB, National Park), flood risk in Zone 3, and any heritage listing directly on the site. These four alone rule out or reshape more deals than the rest of the checklist combined. Ground risk, environmental designations and infrastructure checks matter, but they're more often about design and cost than about whether a scheme is possible at all.
Once you've screened a site against each item, it's worth capturing the result — even briefly — rather than relying on memory. A simple record of what was checked, when, and what was found protects you if a decision is questioned later, and gives anyone else looking at the same site a fast way to pick up where you left off. Maplify's site reports and saved projects are built around exactly this workflow, turning a one-off screening session into a document you can reference or share.
Important limitations
Is this checklist a substitute for a formal due diligence report?
No — it is a starting screening checklist. Material transactions and planning applications should still involve formal searches and professional advice.
Can I check every item on this checklist in one place?
Yes — Maplify lets you enable all of these layers together on one map for a single site.
What if a constraint isn't shown on the map?
Absence of a mapped constraint isn't proof none exists — some designations are only held locally. Always cross-check with the local planning authority for anything material to a decision.
Which constraints matter most if I only have a few minutes?
Planning designations (Green Belt, AONB, National Park), Flood Zone 3, and any heritage listing directly on the site — these are most likely to rule out or reshape a scheme entirely.
Should I keep a record of what I checked?
Yes — a brief record of what was checked and what was found protects you if a decision is later questioned, and saves time if someone else picks up the same site.
