Understanding the daylight requirements in North Kesteven matters for anyone proposing a house extension, an infill dwelling or a larger residential scheme in the district, whether in the market town of Sleaford, in North Hykeham on the edge of Lincoln, or in the many villages strung along the Lincolnshire countryside and around the district's Royal Air Force stations. North Kesteven District Council is the local planning authority (LPA) that determines these applications; Lincolnshire County Council is the upper-tier authority but is not the body that decides most householder and residential proposals. This guide explains how daylight, sunlight and amenity are weighed locally, which adopted policies apply, and what a recognised assessment involves.
Daylight requirements in North Kesteven: the Central Lincolnshire Local Plan
North Kesteven does not have a development plan of its own. It is covered by the Central Lincolnshire Local Plan, a joint plan adopted on 13 April 2023 by the Central Lincolnshire Joint Strategic Planning Committee. The plan is prepared jointly by three local planning authorities - North Kesteven District Council, the City of Lincoln Council and West Lindsey District Council - and replaced the previous Central Lincolnshire Local Plan adopted in 2017. Although the plan is shared, applications in the district are decided by North Kesteven District Council as the relevant LPA. (For projects in the historic city next door, see our companion guide to the daylight requirements in Lincoln, which is covered by the same joint plan.)
The plan is shaped by the district's distinctive geography. North Hykeham forms part of the defined Lincoln urban area, the principal focus for growth, while Sleaford is identified as one of Central Lincolnshire's two Main Towns and a focus for substantial housing growth, including sustainable urban extensions. The district is also home to much of the area's RAF heritage, with active stations including RAF Cranwell, RAF Digby and RAF Barkston Heath - the plan notes that Central Lincolnshire's RAF legacy supports its visitor economy. These different settlement types - urban edge, market town and rural village - all bring daylight and sunlight relationships into play in different ways.
Policy S53 and the daylight and sunlight tests
The central policy for daylight, sunlight and amenity is Policy S53: Design and Amenity. Structured around the ten characteristics of the National Design Guide, it applies to "all development, including extensions and alterations to existing buildings". The amenity criterion is found under theme 8 (Homes and Buildings). Among its requirements, Policy S53 states that development proposals will:
"Not result in harm to people's amenity either within the proposed development or neighbouring it through overlooking, overshadowing, loss of light or increase in artificial light or glare." (criterion 8d)
This names overshadowing and loss of light directly, and protects both the future occupiers of a new development and its neighbours. Theme 3 (Built Form) reinforces this by asking development to be appropriate to its context in terms of "siting, height, scale, massing, form, rhythm, plot widths, gaps between buildings" - the very factors that determine whether a scheme overshadows or overbears - and theme 7 (Uses) requires development to be "compatible with neighbouring land uses" and to give future occupiers a satisfactory standard of amenity.
Design guidance and Sleaford's character
Policy S53 expressly anticipates the use of design codes informed by the National Model Design Code, and the Central Lincolnshire authorities have produced a Central Lincolnshire Design Code to guide the quality of new development. Where a code is adopted for a place, development is expected to adhere to it. For Sleaford in particular, Policy S58 (Protecting Lincoln, Gainsborough and Sleaford's Setting and Character) adds town-specific principles: development should take into account the Sleaford Masterplan, the Sleaford Town Centre Conservation Area Appraisal and the Sleaford Town Centre Regeneration SPD, and should protect important local views including those of the Grade II*-listed Bass Maltings complex and landmarks such as Money's Mill. In Sleaford's conservation area and tightly grained historic streets, those setting and townscape considerations and the daylight and sunlight enjoyed by neighbours are closely linked.
The district does not publish a separate numerical daylight and sunlight Supplementary Planning Document. Where a proposal raises a realistic prospect of harm to a neighbour's daylight or sunlight, or to the living conditions of future occupiers, the practical expectation is that this is demonstrated against the recognised national methodology: the Building Research Establishment guidance, BRE BR 209: Site Layout Planning for Daylight and Sunlight - A Guide to Good Practice (2022 edition), read alongside the British Standard BS EN 17037 on daylight in buildings. The National Planning Policy Framework (NPPF) supports securing well-designed places and a good standard of amenity for existing and future users, and these national documents are applied through Policy S53. BR 209 provides the technical tests that allow the policy language - "overshadowing", "loss of light" - to be measured objectively rather than argued.
What a daylight and sunlight assessment involves
A BRE-based assessment typically considers two questions: the daylight and sunlight enjoyed by neighbouring properties, and the daylight and sunlight that future occupiers of the proposed development will receive. The principal tests include:
- Vertical Sky Component (VSC) - the amount of skylight reaching the centre of a neighbour's window, with a guideline value of 27%, or no worse than 0.8 times its former value;
- Daylight distribution (no-sky line) - how daylight is spread across the depth of a room;
- Annual Probable Sunlight Hours (APSH) - the sunlight reaching windows with a significant southerly aspect, assessed across the whole year and the winter months;
- Overshadowing of gardens and amenity areas - using the sun-on-ground test at the equinox, relevant to the generous garden plots common in the district's villages.
A clear, BRE-compliant report helps a North Kesteven planning officer judge a proposal against Policy S53, and in particular criterion 8d. It is especially useful for two-storey rear and side extensions in Sleaford and North Hykeham where overshadowing of a neighbour's habitable-room windows is a common objection, for backland and infill plots in the district's villages, and for larger urban-extension and apartment schemes near Sleaford. A robust assessment cannot promise consent - no report can - but it gives officers the evidence to reach a sound decision and helps applicants design out problems before submission.
How Fortress Associates can help
Fortress Associates prepares our daylight and sunlight report service to BRE BR 209 (2022) and BS EN 17037 for projects across Sleaford, North Hykeham and the wider North Kesteven district. We work nationwide with a typical 4 to 5 working day turnaround and ask for no advance payment. You can see the full range on our services page or contact us to discuss your site. We also produce Building Regulations drawings where these are needed alongside a planning submission.
Sources & further reading
- North Kesteven District Council - Central Lincolnshire Adopted Local Plan 2023
- Central Lincolnshire - Planning Policy Library
- BRE - BR 209: Site Layout Planning for Daylight and Sunlight (2022)
- GOV.UK - National Planning Policy Framework
- Fortress Associates daylight and sunlight reports and our services
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