Dendra Consulting Ltd
 41a Front Street, Sacriston, County Durham, DH7 6JS
 Tel: 0191 3719636    Email:
 Tel: 0191 3719636
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Development Site Surveys and Reports. Undertaken to British Standard 5837 Trees in relation to design, demolition and construction - Recommendations (2012). Includes:                         

Initial pre-development tree survey to BS5837 including an assessment of tree health and condition

Tree Constraints Plan - Design tool showing above and below ground constraints

Liaison with design team

Arboricultural Impact Assessment

Tree Protection Plan

Arboricultural Method Statement

Tree Reports for Mortgage & Insurance Purposes

These can normally be completed within 2 working days of your request and emailed for speedy completion.

Tree Health & Safety Inspections

Surveys designed to identify trees with any structural or physiological defects, and make recommendations for remedial tree work. These surveys can be tailored to suit homeowners with small numbers of trees or local authorities, housing associations and landowners with much larger numbers of trees.

Quantified Tree Risk Assessment - QTRA

Barry Anderson and Liam Robson are both licensed users of the QTRA method for risk assessing tree failure. The system uses accepted risk management principles in order to facilitate proportionate safety management.

Decay Detection Services

We can undertake decay detection testing using the new IML Resi-PD 400 microdrill. The equipment drills into the wood at a constant rate, and measures both resistance on the drill bit and effort required by the drill to maintain the constant drilling rate. These measurements are then used to establish the presence and extent of decay within the wood.

Our services

The following is a list of the core services we provide. However we are not strictly limited to these so please contact us to discuss any arboricultural or ecological requirements you may have.


Extended Phase 1 Habitat Surveys

The baseline survey designed to establish the potential ecological significance of a proposed development site. Target notes will identify any ecologically significant features. Such features may then be the subject of detailed ecological investigation.

Protected species risk assessments

These assessments are used in conjunction with phase 1 habitat surveys and also include data searches for known protected species records. Species and groups covered include: Bats, Great Crested Newts, Otter, Water vole, Badger, Red squirrel, Birds and Reptiles.

Bat surveys

We undertake bat surveys for planning purposes on a range of projects including loft conversions, barn conversions and demolitions. This involves full building inspections by licensed bat workers and activity surveys, when required, using experienced surveyors. We use heterodyne, frequency division and time expansion bat detectors along with digital recording equipment for post survey analysis of bat calls. Dendra currently has three ecologists licensed to carry out bat surveys.

Great Crested Newt surveys

We undertake Great Crested Newt surveys for planning purposes. This involves habitat suitability assessments, torch surveys, bottle trapping, egg searching and netting. Dendra currently has two ecologists licensed to carry out  Great Crested Newt surveys.

Other protected species surveys

With a number of ecologists present at Dendra we have the capacity to carry out a wide range of other protected species surveys including Otter, Water vole, Badger, Red squirrel, Reptiles and Birds. Please contact us for more information.

Bat mitigation licensing

Our staff have held a number of bat mitigation licences over several years and have the experience required to act as the ecologist on licensable projects. Barry Anderson is a Registered Consultant of the new Bat Mitigation Class Licence (bat low impact class licence). This licence streamlines the licensing process for certain works that are deemed to have a low impact on certain bat species. This has the potential to reduce the paperwork, timescale and cost associated with bat mitigation licensing.

Aerial tree inspections for bat roosts

We can undertake detailed aerial inspections of trees using trained climbers and Mobile Elevated Work Platforms (MEWP). Features of trees likely to be utilised by bats can be inspected in detail with the use of endoscopes. Evening emergence and/or dawn entry surveys can also be undertaken if evidence of bat usage is found.

Ecology reports for BREEAM purposes

We have the experience and qualifications necessary to undertake ecology surveys for projects requiring credits under BREEAM