Understanding the daylight requirements in Wigan matters to anyone extending a home, converting a property or bringing forward a new development across the borough. Wigan Metropolitan Borough Council is the local planning authority, and it weighs the effect of new building on the light reaching neighbouring homes and the living conditions inside the scheme itself. This article sets out how those issues are handled locally, which adopted policies apply, and how a technical report prepared to recognised standards can support an application in towns from Wigan and Leigh to Atherton, Tyldesley and Ashton-in-Makerfield.
The development plan for Wigan Borough
The principal local planning document is the Wigan Local Plan Core Strategy, adopted in September 2013, which looks ahead to 2026 and acts as the borough's overarching Local Plan. Sitting alongside it, the Places for Everyone Plan took effect on 21 March 2024 as the joint development plan for nine Greater Manchester districts including Wigan, and it replaced a number of the older Core Strategy policies. Together these documents form the statutory development plan against which planning applications are decided, and the council is also progressing a new borough-wide Local Plan looking to 2040.
Two Core Strategy policies are particularly relevant where amenity and light are concerned:
- Policy CP10 (Design) requires new development to respect the character of its locality, integrate effectively with its surroundings, create attractive places and meet established standards for design.
- Policy CP17 (Environmental protection) addresses the impact of development on amenity and quality of life, ensuring schemes do not have an unacceptable adverse effect on neighbours and are not themselves harmed by their surroundings.
The supporting text to these policies is explicit about light and privacy. It refers to the effect of proposals "on residential amenity and on privacy for nearby properties" and to the need to provide "adequate levels of space, privacy and residential amenity for occupiers". The broader spatial framework is set by Policy SP1 (Spatial strategy for Wigan Borough), which directs growth primarily towards the borough's main towns. Daylight and sunlight are therefore treated as a core component of residential amenity rather than a stand-alone test.
Daylight requirements in Wigan: the council's design guidance
Wigan is one of the metropolitan boroughs that backs its Local Plan policies with detailed design guidance. The council has adopted a House Extensions Design Guide (June 2019) as a supplementary planning document, and an earlier Design Guide for Residential Development (July 2006). The House Extensions guide identifies loss of daylight and sunlight, loss of privacy and overlooking, and overshadowing as key considerations in assessing householder proposals, and it gives applicants practical advice on how to avoid harm to adjoining homes.
This guidance does not displace the recognised national technical methodology. Where a numerical assessment of daylight or sunlight is needed, the established benchmark is the Building Research Establishment guide, BRE BR 209 (2022), alongside the British Standard BS EN 17037 on daylight in buildings. The National Planning Policy Framework also expects authorities to secure a high standard of amenity for existing and future occupants. In Wigan these national documents are applied through the Local Plan and the council's own design guides, giving officers a consistent way to judge whether a scheme protects the light enjoyed by neighbours.
When is a daylight and sunlight report needed?
Not every application requires a full technical study. A report is most useful where a proposal is tall or deep relative to its neighbours, where windows sit close to a boundary, or where the council, an objector or an appeal raises a specific concern about overshadowing or loss of light. Typical situations in Wigan include:
- Rear and two-storey extensions close to a shared boundary in the borough's many terraced and semi-detached streets.
- Flatted schemes and town-centre regeneration plots in Wigan and Leigh where buildings face one another across narrow gaps.
- Backland or infill housing on garden land, where new homes can affect both existing gardens and their own future occupiers.
- Conversions and changes of use that create new habitable rooms reliant on existing window openings.
What a BRE-based assessment measures
A daylight and sunlight assessment to BR 209 typically looks at the effect on neighbouring properties using the Vertical Sky Component and the daylight distribution within rooms, and the No Sky Line method for internal daylight. Sunlight to neighbouring windows and to gardens and amenity areas is checked using Annual Probable Sunlight Hours, while sun on the ground is tested for overshadowing. For the homes being created, BS EN 17037 sets recommendations for adequate daylight provision. Reporting these figures clearly allows a planning officer in Wigan to see at a glance whether a proposal meets the expectations behind Policies CP10 and CP17.
Local context across the borough
Wigan Borough covers around 200 square kilometres and is home to roughly 318,000 people, with a settlement pattern that ranges from the dense Victorian terraces of the inner towns to the stone-built villages of the outer rural fringe. The Core Strategy itself notes that the inner urban areas are characterised by their Victorian industrial heritage of red brick and terraced housing, while the outer dormitory towns and villages retain a distinctive stone vernacular. This variety has a direct bearing on daylight assessment: tightly spaced terraces in Wigan, Ince and Platt Bridge raise different overshadowing questions from the looser-grained housing around Standish, which has its own neighbourhood plan. Town-centre regeneration in Wigan and Leigh, including higher-density residential schemes, makes careful light modelling especially valuable where new blocks sit close to existing homes.
How Fortress Associates can help
Fortress Associates prepares clear, robust daylight and sunlight assessments for sites across Wigan Borough. Our reports follow BRE BR 209 (2022), BS EN 17037 and the NPPF, and we frame the findings against the council's adopted policies and design guidance so officers can read them quickly. Through our daylight and sunlight report service we offer a 4 to 5 working day turnaround with no advance payment required. You can also explore our wider services, including Building Regulations drawings, or contact us to discuss a specific site.
Related reading
If your project sits on the other side of the Mersey, see our companion guide on daylight requirements in Wirral, which covers the recently adopted Wirral Local Plan.
Sources & further reading
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