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Tree Protection Conditions: TPO and Pre-Application Tree Surveys
Tree protection is one of the most common subjects of planning conditions on residential planning permissions in London โ London has an extremely high tree canopy cover (approximately 22% by area, the highest of any capital city in Europe) and a large number of individually protected trees (covered by Tree Preservation Orders โ TPOs) as well as trees in conservation areas (where notice must be given before any works are carried out to any tree with a trunk diameter of more than 75mm at 1.5m height).
Tree protection conditions: A planning permission for a development near protected trees will typically include a condition requiring: (a) submission of a Tree Survey (BS 5837:2012 survey) and an Arboricultural Impact Assessment (AIA) before construction begins, identifying all trees within the "root protection area" (RPA) of the development and assessing the likely impact of the development on those trees; (b) submission of an Arboricultural Method Statement (AMS) and a Tree Protection Plan (TPP) for approval before construction begins, detailing how the trees will be protected during construction (protective fencing around the RPA, protection of root zones from ground compaction, supervision of any below-ground works within the RPA); (c) installation of the approved tree protection measures before any works start on site; and (d) retention of the tree protection measures throughout the construction period.
Consequences of non-compliance: Damage to or destruction of a protected tree (a tree with a TPO, or a tree in a conservation area that is protected by the "conservation area tree provisions") during construction (for example, by damaging roots during excavation, by parking plant on the root zone causing compaction, or by breaking branches or bark with scaffolding or materials) is a criminal offence under the TCPA 1990. The maximum penalty for damaging or destroying a protected tree is an unlimited fine. The LPA can also require the defendant to plant a replacement tree of an appropriate size and species. Tree protection conditions must therefore be taken seriously โ failure to implement the approved tree protection measures is both a breach of planning condition and a potential criminal offence if the unprotected works cause damage to a TPO tree.
Pre-application tree survey: On sites with mature trees close to the proposed development area, a pre-application BS 5837 tree survey (carried out by a qualified arboriculturist) should be obtained before architectural design begins. The survey will identify all trees (by species, height, spread, and condition), assess their Root Protection Areas (RPAs), and identify any trees that may constrain the design of the development. Designing the development around the tree RPAs โ avoiding foundations within the RPA, avoiding underground services within the RPA, and maintaining adequate clearance between the new structure and the tree trunk โ is far more cost-effective than attempting to modify the design after planning permission has been granted.
Section 96A Minor Material Amendments and Section 73 Variations
Where construction has begun but it becomes apparent that the approved design needs to change โ for example, a window size needs to be altered, a wall position adjusted, or a material changed โ there are two formal routes for varying a planning permission without starting a full new application:
Section 96A amendment (non-material amendment): Section 96A of the TCPA 1990 allows the LPA to approve a "non-material amendment" to a planning permission. A non-material amendment is a change that does not materially affect the approved development โ typically a minor alteration that makes no significant difference to the visual appearance, scale, or use of the development. Examples of non-material amendments: minor adjustments to window positions (moving a window by 300mm in any direction); minor changes to internal layout (moving a partition wall); minor adjustments to roofline profile (adding a small flat section or adjusting the pitch angle slightly). The application fee for a Section 96A amendment is currently ยฃ234 for a householder application. The LPA typically determines Section 96A applications within 8 weeks. Section 96A amendments are faster and cheaper than a new planning application and are the appropriate route for minor design changes.
Section 73 variation: Section 73 of the TCPA 1990 allows the LPA to grant a new planning permission varying the conditions of an existing planning permission. A Section 73 application is appropriate for: changes to the approved design that are more significant than a non-material amendment but less significant than a completely new application; changes to the conditions of the planning permission (for example, changing a pre-commencement condition that has become onerous to comply with); or retrospective variations to as-built developments that deviate from the approved drawings. A Section 73 application results in a new planning permission (the original permission is not revoked โ both permissions remain valid, and the development can be built to either the original permission or the varied permission). The new planning permission includes all the conditions of the original permission, plus the varied condition. The application fee for a Section 73 variation is the same as the fee for the original application type (ยฃ258 for a householder application as of April 2025).
Construction Management Plans and Neighbour Impact Conditions
In London, where construction works in densely built residential streets inevitably affect neighbours, the LPA frequently attaches conditions requiring the submission and approval of a Construction Management Plan (CMP) or Construction Method Statement (CMS) before construction begins. These conditions are particularly common for: basement and cellar excavations (where significant vibration and noise effects on neighbouring properties are likely); loft conversions (where scaffold may need to overhang neighbouring gardens or the public highway); extensions that require party wall works or that are near party walls; and development near sensitive uses (schools, care homes, or hospitals).
What a CMP must typically include: Hours of work (typically 8:00amโ6:00pm Monday to Friday, 8:00amโ1:00pm Saturdays, no work on Sundays or bank holidays โ though some London boroughs specify narrower working hours, particularly in conservation areas or near sensitive uses); a description of the works and the construction programme; details of site hoarding and safety measures; vehicle access and delivery routes (to avoid congestion and conflict with other road users); measures to control dust, mud, noise, and vibration; details of waste management and skip or aggregate delivery arrangements; contact details for the site manager and for complaints; and a procedure for dealing with unexpected archaeological finds (where relevant). Preparing and submitting a CMP that meets the LPA's requirements may require input from an acoustic consultant (for vibration and noise controls) or a specialist contractor (for demolition and excavation management). The cost of a CMP preparation is typically ยฃ1,500โยฃ4,000 depending on the complexity of the project and the level of detail required by the LPA. The CMP is a live document โ it should be kept on site and updated if construction methods or programme change, and any variation to the approved CMP should be agreed with the LPA in advance.
Frequently Asked Questions
Can I start building before all planning conditions are discharged?โผ
How do I find out what conditions are attached to a planning permission for a London property?โผ
Is it too late to discharge a pre-commencement condition after construction has started?โผ
Important Note
This guide is for general information only. Building regulations, planning rules, and legal requirements change regularly and vary by local authority. Always seek professional advice specific to your project and location. rcbGroup offers free initial consultations โ book your free survey.
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