Understanding the daylight requirements in North Lincolnshire is essential for anyone planning a residential extension, an infill plot or a larger housing scheme across Scunthorpe, Brigg, Barton-upon-Humber and the surrounding villages. As the local planning authority, North Lincolnshire Council assesses how new development affects the daylight and sunlight reaching neighbouring homes, as well as the amenity of the spaces created within a proposal itself. This guide sets out which policies apply, where the council's design guidance sits, and how the recognised technical standards are used in practice.
The development plan that applies in North Lincolnshire
North Lincolnshire is a unitary authority, so the council is the sole local planning authority for the area. The adopted development plan is made up of several documents rather than a single Local Plan:
- The North Lincolnshire Core Strategy (adopted June 2011), which sets the strategic policies for growth and design quality.
- The Housing and Employment Land Allocations Development Plan Document (adopted 7 March 2016), which allocates sites.
- The Lincolnshire Lakes Area Action Plan (adopted 10 May 2016).
- Saved policies of the North Lincolnshire Local Plan (originally adopted May 2003), a number of which remain in force for development management.
It is worth being clear about the current position, because it is sometimes misreported. The council is preparing a new single North Lincolnshire Local Plan, but as of mid-2026 that plan has not yet been adopted. It is at an early stage, with initial engagement and a Call for Sites launched in 2025 and further consultation expected before examination. Until the new plan is adopted, the documents listed above continue to form the development plan, and applications must be determined in accordance with them under section 38(6) of the Planning and Compulsory Purchase Act 2004.
Policies that govern daylight, sunlight and amenity
Two strands of policy are most relevant when daylight and sunlight are in question.
Core Strategy Policy CS5 – Delivering Quality Design
Policy CS5 "Delivering Quality Design in North Lincolnshire" requires all new buildings and spaces to be of high quality, to respect their surroundings and not to harm local amenity. Protecting the living conditions of existing and future occupiers, including access to natural light, falls squarely within this policy. CS5 also expects Design and Access Statements to demonstrate how a proposal responds to its context, which is where a daylight and sunlight assessment often supports the design narrative.
Saved Local Plan Policies DS1 and DS5
Among the saved 2003 Local Plan policies, two are commonly cited in officer reports:
- Policy DS1 deals with general development standards and amenity, requiring that there is no unacceptable loss of amenity to neighbouring land uses, including through overlooking and the effects of development on adjoining occupiers.
- Policy DS5 deals specifically with residential extensions and outbuildings. It allows such proposals provided they do not unreasonably reduce sunlight or daylight, cause overshadowing, have an overbearing impact, or result in a loss of privacy to adjacent dwellings, and provided they are sympathetic in design, scale and materials.
Together, CS5 and DS1/DS5 give North Lincolnshire planning officers a clear basis to refuse schemes that would unacceptably overshadow a neighbour's windows or garden, or that would feel overbearing.
Daylight requirements in North Lincolnshire: the guidance position
North Lincolnshire Council does not publish a standalone daylight and sunlight Supplementary Planning Document with its own numerical thresholds. What it does have is Supplementary Planning Guidance: Design Guidance for House Extensions (SPG1), which addresses the impact of extensions on neighbours. SPG1 applies the well-established 45-degree rule as a first-stage test: an extension should generally not breach a 45-degree line taken from the centre of a neighbour's nearest habitable-room window, used to gauge potential loss of light and overbearing impact. It also addresses overshadowing of gardens, privacy and overlooking.
Because the council's own policies and guidance describe the effects to be avoided rather than setting their own measurement methodology, the recognised national technical standards are used to test those effects in detail. The principal references are:
- BRE BR 209 (2022), Site layout planning for daylight and sunlight: a guide to good practice, which sets out the Vertical Sky Component, Annual Probable Sunlight Hours, the no-sky line and overshadowing tests used to assess impact on neighbours and the adequacy of light within new dwellings.
- BS EN 17037, Daylight in buildings, which informs the in-dwelling daylight provision now widely referenced for new homes.
- The National Planning Policy Framework (NPPF), which expects good design and the securing of high standards of amenity, applied locally through CS5, DS1 and DS5.
In short, the local policy hook is North Lincolnshire's own design and amenity policies, while BRE BR 209 (2022) and BS EN 17037 provide the measured evidence that officers and committees rely on.
Local factors that shape assessments
A genuinely useful daylight and sunlight assessment in North Lincolnshire reflects the character of the area:
- Scunthorpe's industrial setting. As a steel town on the edge of the Humber, much of Scunthorpe is densely built with terraced and semi-detached housing on tight plots. Rear extensions on these layouts frequently engage the 45-degree test and BRE neighbour-light checks, because rear gardens and habitable windows sit close together.
- The Humber estuary and the Lincolnshire Lakes. Larger-scale residential growth, including in the Lincolnshire Lakes Area Action Plan area to the west of Scunthorpe, brings layout and orientation questions where the BRE site-layout guidance on sunlight to gardens and amenity space is directly relevant.
- Market towns and villages. In Brigg, Barton-upon-Humber, Crowle and the rural settlements, lower-density and conservation-sensitive contexts mean overbearing impact and overshadowing of long gardens are common points of scrutiny under DS5.
Reflecting these local conditions, rather than producing a generic report, is what makes a daylight and sunlight assessment persuasive to North Lincolnshire officers.
When you are likely to need a daylight and sunlight report
You should consider a professional assessment where:
- A rear or two-storey extension may affect a neighbour's habitable-room windows, particularly on the tight plots common across Scunthorpe.
- An infill or backland plot sits close to existing dwellings and their gardens.
- A larger housing or apartment scheme needs to demonstrate adequate internal daylight to its own future occupiers under BRE BR 209 (2022) and BS EN 17037.
- A neighbour has objected on grounds of loss of light, or an officer has requested supporting evidence.
How Fortress Associates can help
Fortress Associates provides our daylight and sunlight report service to homeowners, architects and developers across North Lincolnshire. Our assessments are prepared to BRE BR 209 (2022) and BS EN 17037 and are written to engage directly with Core Strategy Policy CS5 and saved Policies DS1 and DS5, as well as the council's house extensions guidance. We work nationwide with a 4 to 5 working day turnaround and ask for no advance payment. You can also explore our wider range of services, including Building Regulations drawings to the Approved Documents, and get in touch to discuss your site. For our guide to a neighbouring authority, see our post on daylight requirements in North Northamptonshire.
Sources & further reading
Need help with a UK planning project?
Fixed-fee daylight reports and Building Regulations drawings — delivered in 4–5 working days. No advance payment.
Request a free quote