Biodiversity Net Gain

Biodiversity Net Gain (BNG) is the principle of ensuring that all development results in an increase in biodiversity, through the enhancement and creation of habitats and ecological features.

The Environment Act 2021 requires most developments to deliver a minimum of 10% gain in biodiversity units, as measured using Natural England’s Biodiversity Metric. All on and offsite habitats will need to be secured, monitored and maintained for a period of at least 30 years.

So, if you’re a local planning authority, housing developer, utility provider – or other organisation that manages building developments or land – it’s a good idea to seek expert advice.

Maydencroft specialises in the assessment, design, creation and maintenance of natural habitats and ecosystems, and has many years of experience delivering such projects for clients across all sectors. Whether you require just one of our services, or looking for our involvement at all stages, we guarantee to bring the same level of care and quality to all projects.

If you have a project in mind, or want to speak with a member of our team - please get in touch.

Contact our team 0800 157 7707


The first stage of any Biodiversity Net Gain project is to fully understand and document a site’s ecological baseline. Through a combination of desk study and field surveys, our Ecologists assess and record the type and condition of all habitats on site, and then use Natural England’s Biodiversity Metric to determine the baseline Biodiversity Units. Wherever possible, we undertake this work alongside Preliminary Ecological Appraisals to avoid additional costs.


The baseline metric is used by our Nature Recovery Consultants to determine a series of options for on-site and off-site habitat enhancement and creation to help achieve the required net gain in Biodiversity Units. The design process is further refined through consultation and additional studies as required, resulting in a final BNG Masterplan supported by 30-Yr Biodiversity Offset Management Plans (BOMPs) which detail all of the capital, maintenance & monitoring actions required to achieve the intended goals.


The physical delivery of BNG habitat enhancement and creation works requires specialist Contractors with a great deal of ecological knowledge and understanding. Not only do we support highly-skilled teams with an array of specialised machinery and equipment, but our people care about the environment and take an immense pride in their work, ensuring that all BNG projects are delivered to incredibly high standards.


The true success of BNG schemes will be seen in the effectiveness of maintenance and monitoring over the period of +30-years. Our Estates Division supports teams of roaming Countryside Rangers who specialise in this type of skilled ecological maintenance, and can offer far wider benefits including general site management and community liaison. Through establishing clusters of BNG sites with dedicated delivery teams, we can offer a flexible, cost-effective solution to ensure that BNG targets are always achieved.

To find out more about our biodiversity net gain services, contact a member of our team today

0800 157 7707 Get a quote


"A seamless service; from initial survey, to clear and practical management plans. From senior management level to operative, I have found their staff to be professional, hard-working, courteous and well-disciplined."

J. Merrill, Affinity Water