Daylight requirements in Bassetlaw are shaped by the district council's adopted development plan and its supporting design guidance. Bassetlaw District Council is the local planning authority (LPA) for the district, which includes the principal towns of Worksop and Retford and the surrounding rural areas of the Idle valley and the historic Sherwood region. Although Nottinghamshire is the county, planning applications for most development are determined by Bassetlaw District Council, not the county council. This article sets out how daylight and sunlight are assessed locally and how a properly prepared report can support your application.
The planning framework for daylight in Bassetlaw
The starting point is the Bassetlaw Local Plan 2020–2038, which was adopted by full Council on 29 May 2024 following examination and the Inspector's report. The adopted plan replaced the older Core Strategy and now forms the basis for decisions on development across the district.
Two policies are particularly relevant to daylight, sunlight and the living conditions of neighbours:
- Policy 46: Protecting Amenity – this requires that proposals are designed and constructed to avoid and minimise impacts on the amenity of existing and future users. In particular, development should “not have a significant adverse effect on the living conditions of existing and new residents and future occupiers of the proposed development through loss of privacy, excessive overshadowing or overbearing impact”. Overshadowing is named explicitly in the policy, which makes it directly relevant to daylight and sunlight matters.
- Policy ST33: Design Quality – this requires all development, including householder extensions, to be of high-quality design that respects local context and complements the existing layout, building orientation, scale, form and surroundings. Good daylight and sunlight provision is part of achieving that high standard.
The Local Plan explains that whether an impact amounts to the “significant adverse effect” the policy guards against is a matter of professional judgement, informed where appropriate by specialist input. This is precisely where a technical daylight and sunlight assessment adds value.
Local daylight guidance: the Householder Extensions SPD
Bassetlaw has gone further than many districts by setting out specific, measurable daylight guidance. The council's Householder Extensions Supplementary Planning Document (November 2025) provides detailed guidance on how Policies ST33 and 46, alongside the Bassetlaw Design Code, are applied to extensions, alterations, annexes and outbuildings. An SPD is a material consideration in the determination of relevant applications.
On daylight and sunlight, the SPD is unusually explicit. It states that proposals “must not lead to an unreasonable reduction in daylight or sunlight to neighbouring habitable rooms or private outdoor amenity areas”, and it defines a habitable room as a main living space such as a living/dining room, bedroom, or a kitchen used for dining. It also sets out two geometric tests the council uses to screen for harm:
- The 25° vertical rule – for single and two-storey extensions, a 25° angle is measured from the horizontal at the midpoint of the lowest affected neighbouring window. An extension breaching this line should be supported by a daylight and sunlight assessment demonstrating no significant harm.
- The 45° horizontal rule – for two-storey rear extensions and, where appropriate, side extensions, a 45° angle is taken from the centre of the nearest ground-floor habitable-room window of a neighbour, with a “no-build zone” applying within around 10–12 metres of that window.
Importantly, the SPD states that where a proposal significantly affects usable sunlight hours in adjacent gardens it may be considered unacceptable “unless it can be demonstrated through a daylight and sunlight assessment that mitigation can be achieved”. It also confirms that any such assessment should be proportionate to the scale of the proposal and should set out existing and expected levels of daylight, sunlight and overshadowing on neighbouring properties, together with the mitigation proposed. The SPD also reminds applicants that ‘right to light’ is a separate private legal matter and not a planning consideration.
How the national standards fit in
Bassetlaw's policies set the local tests, but the technical methodology comes from national standards. A robust daylight and sunlight assessment in the district is normally prepared against:
- BRE BR 209 (2022) – Site Layout Planning for Daylight and Sunlight: A Guide to Good Practice, which sets out the Vertical Sky Component (VSC), No Sky Line / daylight distribution, and Annual Probable Sunlight Hours (APSH) tests used to judge impacts on neighbouring windows and rooms.
- BS EN 17037 – the European standard on daylight in buildings, used to evaluate the daylight provision within new dwellings.
- The National Planning Policy Framework (NPPF) – which, as the SPD notes, requires a high standard of amenity for existing and future users. The NPPF applies through the Local Plan and, on optimising land use, encourages an approach to daylight and sunlight that avoids inflexible application of guidance where it would inhibit otherwise acceptable development.
In practice, the BRE BR 209 numerical targets give planning officers and applicants a consistent, defensible way to test compliance with Policy 46 and the SPD's 25° and 45° rules.
What this means for applicants in Worksop, Retford and rural Bassetlaw
Bassetlaw is a varied district. Worksop and Retford contain denser town-centre and terraced housing where windows and gardens sit close together, so loss of daylight and overshadowing are common concerns. The Local Plan itself promotes the regeneration of brownfield land, including former colliery sites such as Welbeck and Bevercotes, where higher-density layouts can make daylight and sunlight a key design consideration. In the rural villages of the Idle valley and the Sherwood area, character and amenity sit alongside one another, and a clear assessment helps demonstrate that an extension or new dwelling will not harm a neighbour's living conditions.
If your proposal is a two-storey rear extension, a backland or infill plot, or a flatted scheme close to existing homes, it is sensible to commission a daylight and sunlight report early. A well-evidenced report can resolve an officer's concern before it becomes a reason for refusal, and it can support a planning application or an appeal.
How Fortress Associates can help
Fortress Associates prepares clear, robust daylight and sunlight reports to BRE BR 209 (2022), BS EN 17037 and the NPPF, read together with the relevant Local Plan policies. If you are planning a project in Bassetlaw, our daylight and sunlight report service assesses your scheme against Policy 46, Policy ST33 and the Householder Extensions SPD, and sets out the VSC, daylight distribution and APSH results that planning officers expect to see. We work UK-wide with a 4–5 working day turnaround and require no advance payment. You can read more on our services page or contact us to discuss your project.
For a neighbouring authority, you may also find our guide to daylight requirements in Cherwell useful if your work spans the East Midlands and Oxfordshire.
Sources & further reading
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