Tree Works & Planning: TPOs, Conservation Area Consent & Crown Reduction

Summary

Trees are protected under two main routes in England: specific protection via a Tree Preservation Order (TPO), or general protection in a Conservation Area. Both require the Local Planning Authority's involvement before work can proceed, and both carry criminal sanctions for breach.

For tradespeople — landscapers, builders, groundworkers — encountering trees on site, the default position should be: if in doubt, do nothing and consult the local planning authority. The financial penalties for unlawful tree removal can far exceed the cost of replanting and remediation.

Beyond planning, tree works require competence. Arboriculture is a skilled discipline; felling large trees near structures and services requires specialist training, appropriate equipment, and formal qualifications (NPTC/Lantra certificates for chainsaw use). Most significant tree works should be contracted to a qualified arborist.

Key Facts

• TPO (Tree Preservation Order) — served by Local Planning Authority under Town and Country Planning Act 1990; protects individual trees, groups, woodlands, or areas of trees
• TPO consent — required for: felling; pruning; topping; lopping; uprooting; deliberate damage; anything that would affect health or appearance
• Exemptions to TPO consent — works essential for prevention of nuisance or in an emergency (fallen tree blocking road); dead or dying trees; trees with a stem diameter under 75mm at 1.5m height; work approved as part of planning consent
• Conservation Area trees — all trees over 75mm diameter; Section 211 notice must be served on the LPA minimum 6 weeks before any work; LPA can make a TPO within that 6 weeks if they wish to protect the tree; if they don't respond within 6 weeks, work can proceed
• Section 206 — LPA can require replacement planting when a protected tree is removed
• Criminal offence — breaching a TPO or Section 211 requirements is a criminal offence under Town and Country Planning Act 1990 s.210; unlimited fine in magistrates court; conviction can also require replacement planting
• Crown reduction — reducing the overall size of the crown by selective pruning; must follow BS 3998 (tree work recommendations); not lopping or topping
• Crown lifting — removing lower branches to raise the base of the crown; increases light; reduces pressure on root zone
• Crown thinning — selective removal of branches throughout the crown to reduce wind resistance and light interception without changing shape
• Pollarding — severe pruning to a pollard head (historic management practice); only appropriate where established; should not be initiated on mature unmanaged trees
• Felling licence — in addition to TPO consent, any commercial felling of trees over 8cm stem diameter (or 15cm in a managed woodland) requires a felling licence from the Forestry Commission unless exemptions apply (garden trees are usually exempt)
• ISA qualification — International Society of Arboriculture; internationally recognised arborist qualification
• RFS qualification — Royal Forestry Society; UK arborist qualification
• NPTC — National Proficiency Tests Council; vocational awards for chainsaw operators
• Subsidence — tree root systems in clay soils can extract moisture and cause subsidence; felling trees can cause heave; consult structural engineer before removing large trees near buildings

Quick Reference Table

Detailed Guidance

Checking TPO Status

Before any tree work on a site:

1. Contact the Local Planning Authority (planning department) to check TPO status — phone or use the online planning search on the council's website
2. Check the council's planning mapping portal — most councils now show TPOs on GIS map systems
3. If the tree is in a Conservation Area, apply the Conservation Area default protection to all trees over 75mm diameter
4. If in doubt, ask the council's Tree Officer

Tree Officers are the LPA employees who manage TPO applications. They are usually helpful for legitimate enquiries about what work is permitted. A pre-application conversation costs nothing and can save significant problems later.

TPO Consent Application

To work on a TPO-protected tree:

1. Identify the tree (TPO number and tree number from the LPA records)
2. Prepare a specification of the works required (preferably prepared by an arborist)
3. Submit a TPO consent application to the LPA (available online via Planning Portal)
4. LPA has 8 weeks to determine the application
5. Works can begin once written consent is received (not before — verbal agreement is not sufficient)
6. Conditions may be attached to the consent (e.g., timing restrictions to avoid bird nesting season, or replacement planting requirements)

Conservation Area Section 211 Notice

In a Conservation Area:

1. Give written notice to the LPA (Section 211 notice) at least 6 weeks before starting work
2. Include: location of tree, description of works proposed, reason for works
3. The LPA has 6 weeks to:
   • Consent (explicitly or implicitly by not responding)
   • Refuse (you cannot proceed without further appeal)
   • Serve a TPO (tree is then protected under TPO rules)
4. After 6 weeks with no TPO served and no refusal, works can proceed

Bird nesting seasons: Do not carry out any tree works that would disturb active bird nests. Birds are protected under the Wildlife and Countryside Act 1981. The main nesting season is March–August, but some species nest earlier or later. Pre-work inspection by an ecologist or experienced arborist is good practice for significant works.

Crown Reduction — What It Means

Crown reduction is often misunderstood. It is NOT:

• Topping — cutting all leaders at a fixed height (debilitating; not recommended by arborists; causes epicormic regrowth and instability)
• Lopping — indiscriminate removal of large limbs (causes decay entry and structural weakness)

Crown reduction IS:

• Reducing the overall height and/or spread of the crown by a specified percentage (e.g., "reduce by 15%" means reducing the tree to 85% of its current height and spread)
• Pruning back to natural branch junctions (the branch collar) to allow the tree to seal the wound
• Done by a qualified arborist following BS 3998:2010

Before specifying crown reduction:

• Identify the reason: is it reducing light, wind resistance, proximity to building, or root spread?
• Consider whether reduction will actually help or whether removal would be more appropriate
• Get a specialist arborist opinion

Root Proximity to Buildings

Tree roots extend significantly beyond the crown radius — typically 1–1.5× the crown spread. In clay soils, roots can cause subsidence by moisture extraction.

Before removing a tree near a building:

1. Get a structural engineer assessment of foundation condition
2. Consider that tree removal on clay soils causes heave (clay rehydrates) which can be more damaging than root-caused subsidence
3. In many cases, crown reduction to reduce root zone moisture demand is preferable to removal

During foundation and drainage work near trees:

• Root protection zones (RPZs) define areas where ground disturbance should be avoided
• BS 5837:2012 sets out RPZ calculation: radius = 12× stem diameter (in metres)
• Excavation within the RPZ risks root damage which can kill or destabilise the tree
• Contact the LPA Tree Officer if any significant root pruning or soil disturbance is required within the RPZ of a protected tree

Chainsaw Qualifications

Any chainsaw operation requires appropriate NPTC/Lantra qualification:

• CS30/30.4 — Safe use of a chainsaw (cross-cutting, maintenance)
• CS31/31.4 — Tree felling and processing
• CS38/38.4 — Chainsaw work from a rope and harness (aerial chainsaw work)
• CS39 — Climbing and rescuing from trees

Unqualified chainsaw use is an HSE offence for commercial operators. Even for domestic DIY, the risks are significant — chainsaw injuries are among the most serious in construction.

Frequently Asked Questions

A tree has fallen and is blocking the driveway. Can I just remove it?

Yes — emergency works to remove an immediate hazard are exempt from TPO consent requirements. However, you must notify the LPA as soon as reasonably practicable after carrying out the works, and must keep any logs/debris in case the LPA wishes to inspect. Do not use "emergency" as a pretext to remove trees opportunistically.

Can a customer insist I remove a protected tree?

No. You cannot carry out works on a protected tree without consent, regardless of what the customer asks. Explain the situation, advise them to contact the LPA, and do not proceed. You could face prosecution even if following customer instructions.

How do I find out if a tree has a TPO on it without going to the council?

Most councils publish their TPO register online — search the council's planning portal for "TPO register" or "tree preservation orders." Many councils also have GIS mapping systems that show TPO locations. If you can't find it online, call the planning department and ask.

Regulations & Standards

• Town and Country Planning Act 1990 (as amended) — TPO framework; Sections 198–214; Conservation Area tree protection

• Town and Country Planning (Tree Preservation) (England) Regulations 2012 — procedural requirements for TPO applications

• Wildlife and Countryside Act 1981 — bird and habitat protection

• Forestry Act 1967 — felling licence requirements

• BS 3998:2010 — Tree work recommendations (the arborist's standard)

• BS 5837:2012 — Trees in relation to design, demolition and construction; root protection zones

• Planning Portal Tree Works — TPO and Conservation Area guidance

• Arboricultural Association — Find a qualified arborist; technical guidance

• Forestry Commission Felling Licences — When felling licences are required

• Ancient Tree Forum — Ancient tree identification and protection

• garden walls — Planning implications of garden structures near trees

• planning permission — Permitted development and tree proximity

• underpinning — Subsidence from tree roots; underpinning near trees

• working at height — Chainsaw and climbing safety