Common Planning Constraints Explained
Most sites have at least one constraint. Understanding them early shapes the design and the evidence your application will need.
Designations
Green Belt, National Landscapes (formerly AONBs), conservation areas and listed buildings each bring additional policy tests and design expectations.
Flood risk
Sites in Flood Zones 2 and 3, or with surface water risk, typically need a flood risk assessment and may face sequential and exception tests.
Ecology and trees
Protected species surveys are seasonal, so early planning avoids delay. Trees with Tree Preservation Orders or within conservation areas are protected. Biodiversity net gain requirements apply to most development in England.
Highways and access
Safe access, visibility, parking and servicing are frequent reasons for objection. A highways consultant may be needed for larger schemes.
Residential amenity
Overlooking, overshadowing, outlook and noise affecting neighbours are material considerations.
This page provides general, preliminary information. It is not a planning decision, formal valuation or professional appointment. Appropriate checks and current planning information may be required. Last reviewed 2026-06-01.