Understanding the daylight requirements in Derby is essential for anyone planning an extension, a backland scheme or a larger residential development in the city. Whether you are a homeowner adding to a Victorian terrace in the suburbs or a developer bringing forward apartments near the Cathedral Quarter, the amount of daylight and sunlight reaching both your proposal and the homes around it can shape whether planning permission is granted. This guide explains how Derby City Council assesses daylight and sunlight, which adopted policies apply, and the national technical standards that sit behind every assessment.
How daylight is regulated in Derby
Derby is a unitary authority, which means Derby City Council is the Local Planning Authority (LPA) for the whole city. It determines planning applications against its adopted development plan, supported by national policy. There is no separate county tier involved in planning decisions for the city.
The principal development plan document is the Derby City Local Plan – Part 1: Core Strategy, adopted on 25 January 2017 and covering the plan period 2011 to 2028. The Core Strategy was prepared jointly within the Derby Housing Market Area alongside Amber Valley Borough Council and South Derbyshire District Council, reflecting the way housing growth is planned across the wider area. A Local Plan Part 2 has been progressing, and the Council consulted on a draft new Local Plan for Derby at the Regulation 18 stage in January 2026; until any new plan is adopted, the Core Strategy and certain saved policies remain the starting point for decisions.
The Core Strategy policies that matter for daylight
Two Core Strategy policies are particularly relevant when daylight and sunlight are in play:
- Policy CP3 – Placemaking Principles. This policy expects high quality, well designed development and requires proposals to “provide good standards of privacy, safety and security to create a pleasant, safe and secure environment”. It also asks applicants to base designs on a robust context appraisal and to respond positively to site orientation — both of which are directly relevant to how a building admits and blocks light.
- Policy CP4 – Character and Context. This policy draws particular attention to “tandem”, “backland” and “tall” developments — generally those over 20 metres in the city centre — because their form means they are more likely to affect the amenity of nearby properties and the character of neighbourhoods. Taller and deeper buildings are exactly the schemes where daylight and overshadowing impacts need to be tested carefully.
Alongside these strategic policies, Derby continues to apply certain saved policies from the City of Derby Local Plan Review. The most directly relevant is saved Policy GD5 (Amenity), under which permission will only be granted where development provides a satisfactory level of amenity and would not cause unacceptable harm to nearby areas. When considering harm, the Council expressly takes into account “loss of privacy”, an “overbearing (massing) effect” and crucially “loss of sunlight and daylight”. This is the clearest local statement that daylight and sunlight are a material amenity consideration in Derby.
The emerging draft Local Plan for Derby (Regulation 18, January 2026) carries amenity protection forward under a re-numbered general development policy, signalling that loss of daylight and sunlight will remain a core test as the plan evolves. Applicants should always check the latest position before submitting.
Does Derby have a daylight and sunlight SPD?
Derby City Council has not adopted a dedicated residential design guide or Supplementary Planning Document setting numerical daylight and sunlight targets for householder extensions or new homes. Its adopted SPDs cover other topics, such as Planning Obligations and specific allocated sites, rather than daylight standards. The Council's Local List of Validation Requirements does not require a standalone daylight and sunlight assessment for every application either.
In the absence of a local numerical standard, Derby assesses daylight and sunlight through its amenity and design policies, informed by recognised national guidance. In practice this means three technical benchmarks carry the weight:
- BRE BR 209 (2022) – Site Layout Planning for Daylight and Sunlight: A Guide to Good Practice, the standard methodology used by planning authorities across the UK for assessing daylight to neighbouring windows (the Vertical Sky Component and No Sky Line tests) and sunlight (Annual Probable Sunlight Hours).
- BS EN 17037 – Daylight in Buildings, which sets targets for daylight provision, sunlight, view out and the avoidance of glare within the new dwellings themselves.
- The National Planning Policy Framework (NPPF), which directs decision-makers to secure a high standard of amenity for existing and future occupants and supports the efficient use of land while avoiding unacceptable living conditions.
Because these standards are applied through the Local Plan rather than a Derby-specific SPD, a well prepared BRE-based assessment is often the most effective way to demonstrate that a scheme satisfies Policies CP3, CP4 and saved GD5.
Where daylight issues commonly arise in Derby
Derby's mix of historic and modern townscape creates recurring daylight pressures. The Cathedral Quarter and the area around Derby Cathedral are sensitive to massing and overshadowing, and the city's Derwent Valley Mills World Heritage Site setting adds further design scrutiny near the river. The Council's wider regeneration ambitions — including the long-running “Our City Our River” programme along the Derwent — mean riverside and city-centre plots are frequently developed at higher densities, where daylight, sunlight and overlooking between buildings must be carefully balanced. Tighter suburban plots also raise the familiar issues of rear extensions affecting a neighbour's windows or garden sunlight.
When should you commission a daylight and sunlight report?
It is worth considering a professional assessment where any of the following apply:
- A two-storey or large single-storey rear extension sits close to a neighbouring boundary and habitable-room windows.
- You are proposing flats, a tandem or backland scheme, or a building approaching or exceeding 20 metres in the city centre.
- A neighbour has objected on grounds of loss of light, overshadowing or an overbearing effect.
- A planning officer or pre-application response has asked for daylight and sunlight to be addressed under the amenity policies.
How Fortress Associates can help
Fortress Associates prepares our daylight and sunlight report service to BRE BR 209 (2022) and BS EN 17037, presenting results clearly against Derby's adopted and saved amenity policies so officers and neighbours can see the impact at a glance. We work UK-wide with a typical turnaround of 4–5 working days, and we ask for no advance payment. You can also see the full range of our planning support services, including Building Regulations drawings to the Approved Documents. To discuss a Derby project, get in touch with our team.
If your scheme is in a neighbouring authority, you may also find our guide to daylight requirements in Dorset useful for comparison.
Sources & further reading
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