Tree Preservation Orders (TPOs): Building Near Protected Trees

Of all the natural constraints an architect can face, mature trees protected by Tree Preservation Orders (TPOs) or designated as ancient woodland present some of the toughest technical challenges. One wrong dig can permanently destabilise a tree's health, leading to immediate enforcement action and a build being put on hold. However, with the right structural techniques, you can build safely alongside nature.

Understanding Root Protection Areas (RPAs)

A tree's root system is not a mirror image of its canopy; it often extends far wider, sitting just beneath the surface of the soil. The area containing the roots most vital to a tree's survival is known as the Root Protection Area (RPA). Standard construction methods—such as heavy excavators tracking across the soil or pouring deep concrete trenches—compact the earth and cut off oxygen and water to the roots, effectively killing the tree.

Case Study 1: The Protected London Plane (Richmond House)

This site contained one of the largest and oldest protected London Plane trees in the capital. To secure planning permission, we designed a building that adapted explicitly to the tree’s presence. Near the critical root protection zone, we deliberately reduced the building down to a single storey to lower its weight and structural footprint. Furthermore, we mandated specialised pile foundations combined with meticulous hand-digging within the sensitive zones, completely avoiding heavy machinery that would compact the delicate soil.

The London Plane Tree Located on the Corner of the Site

Case Study 2: Low-Impact Engineering at Greenway Avenue

Situated directly within an Epping Forest woodland buffer, our Greenway Avenue project required an airtight environmental strategy. Collaborating with the specialist consultants at MWA Arboriculture, we utilised advanced screw pile foundations.

As screw piles have an incredibly slender profile, they can be wound directly into the ground between major tree roots without cutting them, allowing the home to sit elevated on stilts above the woodland floor while detailed landscape proposals restore the native floor ecology.

Slender Screw Piles Ready for the Timber Framed Building

For information on how trees are legally protected, read the GOV.UK Guidance on Tree Preservation Orders and Trees in Conservation Areas.

Don't let protected trees stall your development. Our team specialises in complex sites. Get in touch with us today to discuss your site.

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