Permitted Development and Trees — What You Still Need to Do

Where This Goes Wrong — Householders

The common scenarios:

• Extensions. Foundations and groundworks routinely encroach into root protection areas. The extension may be permitted development; cutting the roots of a TPO tree to build it is not.
• Outbuildings and garden rooms. Very often sited at the bottom of the garden, which is very often where the mature trees are. Ground bearing slabs, service trenches, and access for machinery all affect root systems.
• Hardstanding and driveways. Excavation and compaction across a root system does lasting damage that isn't visible until the tree declines years later.
• Levelling and landscaping. Raising or lowering ground levels within a root protection area is one of the most damaging things you can do to a mature tree, and it rarely occurs to anyone that it needs consent.

In each case the answer is the same. Check whether the tree is protected before you commit to a design, and get the root protection area established so the layout works around it.

→ Advice on protected trees

Brownfield / Previously Developed Land

Brownfield — previously developed land — carries a strong policy presumption in favour of reuse, but "previously developed" does not mean "without trees." Self-sown trees colonise disused industrial sites quickly, and a site that has stood empty for a decade can carry substantial tree cover, sometimes including trees now of a size and quality that constrain the developable area.

The planning question on brownfield is rarely whether you can develop, but how the layout works around the trees that have established — and whether any carry a Tree Preservation Order or sit within a Conservation Area that changes the picture. Getting the arboricultural constraints mapped early prevents a layout being designed around trees that have to go, or worse, being refused because it removes trees the authority expected to be retained.

What UTM provides for brownfield sites: an early tree constraints plan to inform layout, full BS5837 survey and categorisation, and impact assessment where trees are affected — so the developable area is understood before the design is fixed.

Statutory Undertakers — A Different Position

This is where the position genuinely differs, and it is not widely understood.

The exemption that allows works to a protected tree where those works are necessary to implement a planning permission does not extend to permission granted under permitted development rights — with the exception of statutory undertakers. Certain statutory undertakers, and bodies such as the Environment Agency and land drainage boards, hold specific exemptions from the requirement to obtain consent before carrying out works to trees protected by an Order in connection with their operations.

That does not mean trees can be disregarded. It means the consent route differs, and the operator's own environmental and arboricultural obligations, along with any scheme-specific requirements, take on greater importance in the absence of the local authority consent process. Recording the arboricultural position properly becomes more important, not less, because there is no external check.

We have provided arboricultural input on infrastructure and utility works proceeding under permitted development rights, including for water utility operations and airport operational development.

Telecommunications and Prior Approval

Electronic communications operators hold their own permitted development rights, and many of those rights are subject to prior approval — meaning the authority can consider matters including siting and appearance before the development proceeds.

Where trees form part of the setting of a proposed mast or apparatus, or where access and cable routes cross root protection areas, the arboricultural position can become a material part of that prior approval consideration. The rights are complex and operator-specific, and the correct starting point is to establish which class applies and what the prior approval covers.

Airports and Operational Development

Airport operators hold permitted development rights for operational development within the perimeter. As with other infrastructure PD, the absence of a planning application does not remove tree protection where it applies, and it does not remove the operator's duty of care in respect of the trees themselves.

Airport sites also carry arboricultural considerations most sites do not — obstacle limitation surfaces, bird strike management, and the interaction between tree management and operational safety. We have provided arboricultural survey work at airport sites.

What We Provide

Tree protection status check — establishing whether trees on or adjacent to your site are subject to a TPO, within a conservation area, or protected by a planning condition from an earlier permission.

Root protection area assessment — calculating the RPA for each tree so the development footprint can be designed around it rather than through it.

Tree works applications and section 211 notices — preparing the arboricultural justification where consent or notice is required.

Arboricultural method statements — specifying how works proceed within or near a root protection area, including no-dig construction and hand digging.



Arboricultural evidence for infrastructure and utility schemes — where development proceeds under permitted development or prior approval and the arboricultural position needs recording properl

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