Site navigation:

ECOFACT ECOFACT | Expert Bat Surveys and Management

The category page

Bat Surveys for Buildings

Bat surveys for buildings – Introduction

Bat surveys: All Irish bat species have been known to use buildings to some extent, with some species are more reliant on buildings than others. Bats have adapted to living in a wide range of man-made structures, including churches, old mansions, bridges, ice houses, modern houses and farm buildings, among others. Parts of a building where bats may roost include attic/roof void, behind hanging tiles, between roof felt and slates, behind soffit boards at a gable and in wall cavities crevices in roof timbers and wall cracks. Bats rely on buildings for roosting, typically roost in buildings in the warm summer months, between June and August, although they may be present earlier or later depending on the building and weather conditions.

bat-surveys-for-farm-buildings bat-surveys1 bat-surveys-for-buildings

Most building owners never discover bats in their until they need to carry out work, and then discover the bats during a bat survey or during the work.

Different bat species select different types of roosts in buildings since they look for sites comparable to those chosen in natural habitats.

ECOFACT have the expertise to provide bat surveys of buildings and other structures prior to planned works. The types of surveys completed are outlined as follows:-

.

Bat Surveys – Presence/Absence Surveys

A building with potential for roosting bats is inspected inside and out during daylight hours, using torches and endoscopes as required. A p; presence/absence bat survey can be conducted at any time of year. These bat surveys involve looking for evidence of roosting bats including live bats, remains of dead bats, droppings, staining, and feeding remains. Following this initial bat survey and assessment the building is assessed for their potential to be used by roosting bats.

.

Bat Surveys – Activity Surveys

All buildings assessed as having high potential for roosting bats should have a bat activity survey conducted. Bat activity surveys are carried out during the period May to August/September. This type of bat survey assesses  bats leaving at dusk and re-entering the building at dawn with the aid of bat detectors. It is usual for at least two activity surveys to be conducted, approximately two weeks apart, in order to have enough information to determine the status of the building. The number of bat workers required to carry out the survey will depend on the building type. Numbers, species and emergence times and exits are recorded in detail. Where possible a static remote bat detector (i.e. Anabat system) can be left inside the building for several days to record bats usage of the building throughout the night.

bat-surveys-ireland bat-survey-ireland bat-surveys-of-buildings

It is recommended that proposed developments avoid all buildings with confirmed roosts or those identified as having high potential for roosting bats as a result of a bat survey. However, if this is not possible a ‘European Protected Species’ license to disturb/destroy the confirmed bat roost(s) will be required from the NPWS (or as relevant the Northern Ireland Environment Agency) before any work on the buildings can commence. A Bat Mitigation Plan is required as part of the derogation application process.

Current News Stories:

  • Filming a documentary on Sea Lampreys

    We were delighted to work recently with BBC Earth on a documentary on Sea Lampreys Petromyzon marinus. The filming took place during early-June 2017 on the old River Shannon at Castleconnell, Co Limerick. This is part of the Lower River Shannon Special Area of Conservation, and Sea Lampreys are a key conservation interest of this […]

    Continue Reading
  • Major new book – Wildlife and Wind Farms

    A major new book will be published in May 2017 entitled ‘Wildlife and Wind Farms: Conflicts and Solutions’. Volume 1 of this book includes a chapter prepared by Ecofact Principal Ecologist Dr. William O’Connor. The two-volume set provides a comprehensive overview of the interactions between wind farms and wildlife, each volume dedicated to one of the two […]

    Continue Reading
  • Surveying wintering birds in the Irish Midlands

    Our staff are currently undertaking a number of wintering bird surveys in the Irish Midlands. Here we have provided some photos and videos from bird surveys we undertook during December 2015. Our bird surveys are undertaken to inform both the Environmental Impact Statement (EIS) and Natura Impact Statement (NIS) reports being prepared for proposed wind energy […]

    Continue Reading
  • Marine and estuarine ecology surveys

    Marine and estuarine ecological surveys are a key service provided by ECOFACT. These surveys are undertaken for a number of purposes, including informing the Environmental Impact Assessments and Article 6 Appropriate Assessments of proposed developments affecting the marine / estuarine environment. These surveys are also to monitor the impact of industrial and municipal discharges and aquaculture […]

    Continue Reading
  • Freshwater Pearl Mussel surveys

    The Freshwater Pearl Mussel Margaritifera margaritifera is a (freshwater) bivalve listed under Annex II and V of the EU Habitats Directive. It is legally protected in Ireland under Schedule 1 of the Wildlife Act (1976 (Protection of Wild Animals) (Statutory Instrument No. 112, 1990) and the European Communities (Natural Habitats) Regulations (Statutory Instrument No. 94, 1997). Owing […]

    Continue Reading

Photo Gallery

View More >>

Site Search

facebooktwitterlinkedingoogle+youtube