Understanding the daylight requirements in King's Lynn and West Norfolk is essential for anyone planning a residential extension, an infill plot or a larger development in this part of Norfolk. The Borough Council of King's Lynn and West Norfolk is the local planning authority (LPA) for the area — the relevant tier is the borough, not Norfolk County Council — and it judges the effect of new building on daylight, sunlight and overshadowing through its adopted development plan and national guidance. This article explains the policy framework, the technical standards that apply, and how to give your application the best possible chance of a smooth decision.
The adopted planning framework
The principal document for the borough is the King's Lynn and West Norfolk Local Plan 2021-2040, which was adopted on 27 March 2025. This replacement plan supersedes the earlier development plan documents (the Core Strategy of 2011 and the Site Allocations and Development Management Policies of 2016) and now provides the borough-wide policies against which planning applications are assessed up to 2040.
Two policies are particularly relevant to daylight and sunlight matters:
- Policy LP18 (Design and Sustainable Development) — this requires all new development to be of high quality design that responds to the context and character of places in West Norfolk, ensuring that the scale, density, layout, materials and access enhance the quality of the environment. In practice this is the policy hook through which the council considers the relationship between a proposal and its neighbours, including the protection of residential amenity.
- The plan also carries forward the long-standing principle that development should not cause unacceptable harm to the amenity of neighbouring and future occupiers — a theme previously expressed in the borough's Policy DM15 (Environment, Design and Amenity) under the 2016 Development Management Policies. Loss of light, overshadowing, overbearing impact, privacy and overlooking all fall within this amenity test.
The borough has not adopted a dedicated daylight and sunlight Supplementary Planning Document (SPD). At the time of writing, the council's only adopted SPD is the West Winch Growth Area Framework Masterplan SPD (adopted January 2023), which concerns a strategic growth allocation rather than detailed daylight standards. Because there is no local numerical daylight guidance, the recognised national methodology applies through the design and amenity policies of the Local Plan.
Which technical standards apply?
Where a Local Plan does not set its own daylight metrics, planning officers in King's Lynn and West Norfolk rely on the established national framework:
- BRE BR 209 – Site Layout Planning for Daylight and Sunlight: A Guide to Good Practice (2022, third edition). This is the document planners and inspectors turn to for the recognised tests — Vertical Sky Component (VSC), the No Sky Line / daylight distribution method, the Annual Probable Sunlight Hours (APSH) test for sunlight, and overshadowing of amenity areas.
- BS EN 17037 (Daylight in Buildings), which underpins target illuminance levels for the daylight provision within new dwellings.
- The National Planning Policy Framework (NPPF), which expects good design and reasonable living conditions for existing and future occupiers, while encouraging an efficient use of land. The NPPF specifically notes that local authorities should take a flexible approach to daylight and sunlight where it would otherwise inhibit appropriate development, particularly on previously developed land.
These standards are applied through the Local Plan, not instead of it. A well-prepared daylight and sunlight report demonstrates compliance with BRE BR 209 and BS EN 17037, and links those findings back to Policy LP18 and the borough's amenity expectations.
What the BRE tests measure
For neighbouring properties, the assessment typically considers:
- Vertical Sky Component (VSC) — the amount of skylight reaching a neighbour's window, with 27% treated as the benchmark for good daylight.
- Daylight distribution (No Sky Line) — how far daylight penetrates into a room.
- Annual Probable Sunlight Hours (APSH) — sunlight to windows facing within 90 degrees of due south.
- Overshadowing of gardens and amenity spaces, often using the spring equinox sun-on-ground test.
Local context that shapes assessments in West Norfolk
King's Lynn and West Norfolk has distinctive characteristics that frequently influence daylight and sunlight cases:
- The historic core of King's Lynn. The town centre and waterfront — home to landmarks such as the Custom House, King's Staithe and the medieval merchant streets — contain numerous conservation areas and listed buildings. Tightly grouped historic plots mean daylight relationships between buildings are often sensitive, and conservation considerations sit alongside the amenity assessment.
- A predominantly rural and coastal borough. West Norfolk stretches from the Norfolk Coast (around Hunstanton and the north Norfolk fringe) to The Wash and the Fens. Many settlements are low-density villages where new infill and extensions must respect generous spacing and established building lines — the very factors that protect daylight to neighbours.
- Market towns such as Downham Market and Hunstanton, where modest plot sizes and terraced and semi-detached layouts make overbearing impact and loss of light a common reason for neighbour objection.
Because of these local conditions, an assessment that references the actual character of the street or settlement — rather than a generic template — tends to carry far more weight with the case officer.
When you are likely to need a daylight and sunlight report
A formal assessment is commonly expected or advisable where:
- a two-storey or rear extension could overshadow a neighbour's windows or garden;
- an infill or backland plot sits close to existing dwellings;
- a flatted scheme or higher-density redevelopment is proposed, particularly in or near King's Lynn town centre;
- a neighbour has raised concerns about loss of light, or the council has requested supporting information to validate the application.
It is always worth checking the council's householder and major application validation requirements before submission, as the supporting information expected varies with the scale and sensitivity of the proposal.
How Fortress Associates can help
Fortress Associates provides our daylight and sunlight report service to homeowners, architects and developers across King's Lynn and West Norfolk. Each report is prepared to BRE BR 209 (2022) and BS EN 17037 and written to address the borough's design and amenity policies directly. We work UK-wide, offer a 4–5 working day turnaround, and ask for no advance payment. We also prepare Building Regulations drawings where your project needs them. To discuss a project, get in touch with our team.
Related reading
If your project sits elsewhere in the East of England, you may find our guide to daylight requirements in Breckland helpful, as it covers a neighbouring Norfolk district with a different adopted Local Plan.
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