Root Protection Areas (RPAs) are a fundamental concept within BS 5837:2012, defining the minimum area around a tree that must remain undisturbed to safeguard the roots essential for its health, stability and long-term survival. Calculated using tree size, species and growth characteristics, the RPA acts as a buffer zone where excavation, compaction, level changes and construction activities must be carefully controlled—or avoided entirely.
Understanding RPAs early in the design process is crucial for successful, compliant site planning. We provide expert advice on how RPAs influence building footprints, access routes, hard surfacing, drainage layouts, service runs and construction methodology. Our guidance helps architects and planners make informed decisions, ensuring designs are both efficient and technically feasible while respecting tree constraints.
We also assist with identifying areas where specialist engineering solutions may allow sensitive construction within or near an RPA, such as no-dig surfaces, pile-and-beam foundations or hand-dug service trenches. This balanced approach enables development to proceed without compromising tree health.
RPA Remediation Support – Geo-Injector Service
If you believe an RPA has been compromised during groundwork or construction—through soil compaction, accidental excavation, chemical contamination or machinery movement—early intervention is essential. Our specialist Geo-Injector service can help remediate soil structure, restore aeration, and promote root recovery. This can significantly improve the tree’s chances of long-term survival after inadvertent damage.
If you have concerns about potential RPA breaches or need tailored advice during planning or construction, contact us for expert support and effective remedial solutions.
