Tree Preservation Orders (TPOs): What Architects Need to Check Before Designing

Obtain the TPO schedule and plan and check whether it protects an individual tree, group, area or woodland. Identify the relevant trees on the survey and resolve discrepancies with the authority. Group and woodland protection can be misunderstood if the review relies only on individual point records.

Record the order reference, confirmation status, source date and proposed works. A landowner’s recollection or an arboricultural category is not a substitute for the operative record.

The government TPO guidance distinguishes consent from exceptions. A diseased or dying tree still needs consent unless another exception applies. For work on a dead tree, normally give at least five working days’ written notice; urgently necessary work addressing an immediate risk of serious harm has different notification requirements. Keep evidence supporting any exception.

Trees in conservation areas can require six weeks’ notice even without a TPO, subject to exceptions including specified small-stem cases. Check the measurement and purpose of the work before relying on an exception. Unauthorised work may lead to prosecution and replacement duties; there is no single £20,000 cap applying to all tree offences.

Ask the arboriculturist to record species, dimensions, condition, retention categories and the design implications using the applicable BS 5837 approach. Request an assessment of neighbouring trees affected by the works as well as those inside the ownership boundary.

Categories A, B, C and U communicate arboricultural assessment; they do not mean that every A tree is legally immovable or that a C or U tree can be removed without checking protection, habitat value and consent. Consider the reasons for retention and removal within the planning strategy.

A root protection area is a design and construction safeguard informed by tree measurements and the arboricultural method. The simple single-stem calculation is not sufficient for every tree. Multi-stem trees, existing structures, rooting conditions and the distribution of roots can change the assessment.

Have the arboriculturist mark the relevant area and explain any adjustment. Do not treat a circular desktop buffer as a measured root survey or an automatic no-build rule. Foundations, drainage, utility trenches, level changes, storage and construction traffic must all be assessed, not just the finished building footprint.

Carry agreed retained trees, protective fencing and working restrictions into the coordinated drawings, specification and site setup. Check whether the proposed build sequence can actually respect those areas. Resolve conflicts with temporary access and deliveries before tender.

Keep the consent conditions and any arboricultural method statement with the site information. Reassess changes rather than allowing an early diagram to drift away from the construction plan. Costs and response times should be obtained for the specific instruction and application; an unsourced fixed survey price or assumed five-day council decision is not a dependable programme.