Biodiversity SPD for Northamptonshire — August 2015
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StageA5:Enhancement:delivering‘netgain’inbiodiversity
Even in cases where migaon or compensaon is deemed unnecessary, planning policy requires new development
to provide a net gain in biodiversity where possible
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. This should be appropriate to the scale, type and locaon of
the development.
Biodiversity enhancements should adhere to the following principles:
• Management plans and long-term funding must both be in
place to ensure enhancements are sustainable and result in a
lasng benet to biodiversity.
• Enhancements should add to exisng habitat networks/
wildlife corridors where they exist (see Figure 1). This is
parcularly important on sites within or adjacent to the
Nene Valley Nature Improvement Area (NIA) (Figure 3),
where developments of a scale to contribute a signicant,
quanable benet, or conversely undermine the delivery of
NIA objecves will be expected to enhance and improve the
ecological network of the NIA.
• Public open space should include natural and semi-natural
habitats. Larger spaces are logiscally easier and more cost
eecve to manage than smaller ones. They also make a
greater wildlife and amenity contribuon. In areas with
several conguous development sites applicants should
consider working together to create larger and more eecve
habitat areas.
• Enhancements should seek to contribute to Biodiversity
Acon Plan objecves.
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• Enhancements which also provide ood aenuaon or
sustainable drainage, improve ecosystem services or deliver other benets will be welcomed.
• Opportunies should be taken to incorporate biodiversity into the fabric of buildings, for example:
• Living roofs and/or living walls. These promote urban biodiversity while reducing storm water runo
and providing building insulaon, reducing cooling costs in summer (not appropriate for Listed
Buildings or most tradional buildings).
• Swi and swallow bricks, which are mortared directly into brick walls
• Bat access les for roofs, bat bricks, bat cavies for walls.
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• Where possible and praccal, nave species should be used in the landscaping scheme. Nave species
should be appropriate to the local environment and to the extent possible sourced from local seed. The
Flora Locale website www.oralocale.org has a directory of suppliers of locally sourced seed and plants.
• Ornamental planngs should include a substanal proporon of species and variees which support
bumblebees, bueries and other pollinators. Landscaping schemes should include plants which ower at
dierent mes throughout the year. The RHS ‘Perfect for Pollinators’ lists
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are an excellent starng point for
creang pollinator-friendly landscaping.
• Tree species should be considered within both the exisng ecological context and predicted climate change
condions. The Forest Research website (www.forestresearch.gov.uk) oers advice on choosing trees for
climate change resilience.
14 Communies and Local Government. 2012. Naonal Planning Policy Framework, paragraph 109.
15 Northamptonshire Biodiversity Partnership. 2008. Northamptonshire Biodiversity Acon Plan hp://www.
northamptonshirebiodiversity.org.
16 More ideas can be found in: Murphy B, Gunnell K and Williams C. 2013. Designing for Biodiversity: A Technical Guide for
New and Exisng Buildings, 2nd edion. London: RIBA Publishing, 176 p.
17 The Royal Horcultural Society. 2014. Plants for Pollinators [ONLINE]. hp://www.rhs.org.uk/science/conservaon-
biodiversity/wildlife/encourage-wildlife-to-your-garden/plants-for-pollinators. Accessed 16 May 2014.
Many plant species which are nave
to the UK are not in fact found in
Northamptonshire, and some species
are only found in certain parts
of the county. Seed and planng
mixes should be appropriate to the
locaon. Informaon on species
distribuon can be found in The Flora
of Northamptonshire and the Soke
of Peterborough, available at some
libraries.
Water avens Geum rivale is found in most
commercial wetland seed mixes but is not nave
to Northamptonshire. Photo by Axel Krisnsson