Tracked Version of Core Strategy, November 2012 - Selby District ...

gradually diminish as those sites are built out and delivery from new
allocations will form the full source of supply to meet the 450 dpa target
over the remaining plan period. The ‘unknown windfalls’ will continue to
contribute towards overall housing supply on top of the 450 dpa target.
Only if delivery from the allocated sites falls below the 450 dpa target
will the ‘unknown windfalls’ contribute to meeting a shortfall rather than
providing an additional amount. However, this scenario is highly unlikely
to prevail because the Site Allocations Local Plan will only allocate
genuinely deliverable sites and Policy CP3 contains the mechanisms to
respond to delivery under-performance picked up through annual
monitoring. Therefore, the 450dpa target will be achieved, and with
significant windfall on top of that target when viewed across the life of
the Core Strategy rather than looking at each year in isolation.
Windfall Data
8. The Core Strategy assumes that ‘unknown windfalls’ in the order of
105-170 dwellings per year will contribute to housing delivery on top of
the 450 dpa target. This is based on the following assessment:
9. In line with Para 48 of NPPF, any allowance should be realistic (not
include residential gardens) having regard to:
(i)
(ii)
(iii)
historic windfall delivery rates
the Strategic Housing Land Availability Assessment
expected future trends
i) historic windfall delivery rates
10. The table below provides windfall data for the past 7 years and shows
that historically the annual windfall delivery rates have contributed
significantly to the overall housing delivery but have fluctuated year on
year.