Daylight Requirements in Amber Valley

The River Derwent and historic mill town of Belper in Amber Valley, Derbyshire

Understanding daylight requirements in Amber Valley is essential for anyone planning a house extension, an infill plot or a larger residential scheme in the borough. Whether the site is in Ripley, Alfreton, Belper or one of the surrounding villages, the local planning authority is Amber Valley Borough Council — not Derbyshire County Council — and it is the borough that determines how daylight, sunlight and amenity are assessed. This guide explains the policy position in Amber Valley and how a technical daylight and sunlight report can support a planning application.

The planning policy framework in Amber Valley

Amber Valley Borough Council adopted the Amber Valley Borough Local Plan 2022-2040 on 2 March 2026, following an examination that concluded in early 2025 and a main modifications consultation. The new plan replaces the long-standing 2006 Amber Valley Borough Local Plan and now carries full weight in the determination of planning applications across the borough.

The policy most relevant to daylight and sunlight is Policy EN15 (Quality and Design of Development). Among its criteria, the policy requires that development should:

“not unduly affect the amenities of privacy of adjoining or adjacent properties, including through loss of light, external lighting, overshadowing, overlooking, or by residential tandem development immediately behind existing properties sharing the same access”.

This sits alongside Policy SS1 (Presumption in favour of Sustainable Development), which frames the council’s decision-making in line with national policy. Because Amber Valley contains the Derwent Valley Mills World Heritage Site, schemes at Belper and along the Derwent corridor must also have regard to Policy EN5 (Derwent Valley Mills World Heritage Site) and Policy EN4 (Heritage Assets) — design quality and the relationship between buildings can be especially sensitive in these areas.

Daylight and sunlight guidance: the Amber Valley position

Amber Valley does not set out numerical daylight and sunlight targets within the Local Plan itself. Instead, the detailed amenity standards are found in the council’s adopted Residential Development Supplementary Planning Document (SPD), October 2007. Section 12 of that SPD sets clear, locally specific standards that officers apply when assessing impact on neighbours:

A minimum of 21 metres between facing main aspects (habitable-room windows) for a two-storey building, a distance the SPD states “ensures that adequate daylight/sunlight and a reasonable garden length is provided and some degree of privacy is secured”;
10.5 metres from main windows to the boundary with an adjacent property’s private amenity space;
12.5 metres between a main aspect (habitable room) window and a secondary or side aspect;
Single-storey extensions, where privacy is less of an issue, are judged on their own merits;
Boundary screening of at least 1.8 metres where privacy needs to be protected.

For extensions, the SPD applies the well-known 45-degree line test: where a side-facing window provides the only source of light to a habitable room, an applicant must demonstrate that a proposal will not take light from, or be overbearing to, that window, with reference to a 45-degree line projected from the sill of the neighbouring window. Where part of a proposed structure crosses that line, a more detailed assessment of light loss may be required.

These rules of thumb are useful starting points, but they are not a substitute for a technical assessment. Where a relationship is tighter than the standards, or where a window orientation, an existing extension or sloping ground complicates matters, the council will look for a quantified study. This is where the national technical methodology comes in.

How BRE BR 209 and BS EN 17037 apply

In the absence of bespoke numerical daylight targets in the Local Plan, the recognised technical benchmarks apply through Policy EN15 and national policy. The relevant standards are:

BRE BR 209 – Site Layout Planning for Daylight and Sunlight: A Guide to Good Practice (2022 edition), which sets out the Vertical Sky Component (VSC), No Sky Line / daylight distribution, and Annual Probable Sunlight Hours (APSH) tests used to judge impact on neighbours, plus the overshadowing test for gardens and amenity areas;
BS EN 17037 (Daylight in Buildings), which informs the daylight provision within proposed new dwellings;
The National Planning Policy Framework (NPPF), which asks decision-makers to secure a good standard of amenity and to make efficient use of land, balancing daylight with appropriate densities.

A BRE-based report translates the council’s amenity expectations into measurable figures, demonstrating either that a proposal complies or that any shortfall is modest and justified in context — particularly important on constrained urban sites in Ripley town centre or near the historic mill settlements.

When is a daylight and sunlight report needed in Amber Valley?

A report is most often expected where a two-storey extension or new dwelling sits close to a neighbour’s habitable-room windows or private garden; where a scheme falls short of the SPD’s 21-metre, 10.5-metre or 12.5-metre standards; where development is proposed in or adjacent to the Derwent Valley Mills World Heritage Site; or where a neighbour or officer has raised a loss-of-light objection. Submitting a BR 209 assessment up front can save weeks of negotiation and reduce the risk of refusal.

How Fortress Associates can help

Fortress Associates prepares our daylight and sunlight report service to the BRE BR 209 (2022) methodology and BS EN 17037, tailored to Amber Valley’s adopted Local Plan and Residential Development SPD. We work UK-wide with a 4–5 working day turnaround and no advance payment. We also produce Building Regulations drawings to Approved Documents A–S. To discuss a site in Ripley, Alfreton, Belper or anywhere in the borough, get in touch and we will advise whether an assessment is needed.

Sources & further reading

daylightsunlightAmber ValleyBRE BR 209Local Plan 2022-2040Residential Development SPDplanningBelper

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