Daylight requirements in Reading are an increasingly important part of getting planning permission. As one of the South East's principal commercial centres, Reading is seeing sustained pressure for taller buildings and higher-density living, particularly around the railway station, the town centre and the Thames-side regeneration areas. At the same time, the borough's established residential streets are dense and closely built. Whether the project is a flatted scheme in the centre or a rear extension in a suburb such as Caversham or Tilehurst, demonstrating that daylight and sunlight are properly protected is often central to a successful application.
This guide explains how daylight and sunlight are assessed in Reading, which adopted policies and guidance apply, and when a formal assessment is likely to be expected. It is aimed at homeowners, developers, architects and planning agents preparing applications to Reading Borough Council.
The adopted planning framework in Reading
The statutory development plan for the borough is the Reading Borough Local Plan, adopted on 4 November 2019, which guides development to 2036. Two policies are central to daylight and sunlight:
- Policy CC8 (Safeguarding Amenity) is the key amenity policy. It requires that development does not result in a detrimental impact on the living environment of existing residential properties, or unacceptable living conditions for new residential properties, in terms of privacy and overlooking, access to sunlight and daylight, and visual dominance, among other factors. Daylight and sunlight are therefore named explicitly in the adopted policy.
- Policy CC7 (Design and the Public Realm) requires development to be of a high design quality that maintains and enhances the character and appearance of its area, addressing layout, landscape, density and mix, scale (height and massing), and architectural detail. Scale and massing decisions made under CC7 directly affect overshadowing and loss of light.
Two further policies frequently come into play:
- Policy H10 (Private and Communal Open Space), which requires new dwellings to be provided with functional private or communal open space for sitting out, play and general outdoor use, amenity space whose usability depends in part on sunlight access; and
- The plan's tall buildings and town-centre policies, which steer the higher-density, taller development now coming forward around the station and the Thames, and which raise daylight and sunlight questions for both neighbouring occupiers and future residents.
Reading is also progressing a Partial Update of the Local Plan, submitted for examination in May 2025. Until that update is adopted, the November 2019 Local Plan remains the development plan against which applications are determined, though the emerging update may carry weight as a material consideration depending on its stage. It is worth checking the current position with the council before submitting.
Reading's local daylight guidance: the House Extensions SPD
Unlike many authorities, Reading has adopted detailed local design guidance that addresses daylight and sunlight directly. The Design Guide to House Extensions Supplementary Planning Document, adopted in March 2021, supplements the Local Plan policies and is a material consideration in determining householder applications.
The SPD warns that care must be taken when designing an extension of any scale so that there is no loss of daylight to habitable rooms in neighbouring dwellings, and states that an application is highly likely to be refused unless it can be demonstrated that neighbouring homes will not suffer a loss of light. It introduces the well-known 45-degree rule of thumb as a way of testing impact on neighbours' windows, and it asks applicants to consider orientation: rear extensions on north-facing elevations tend to have less overshadowing impact, while development on southern elevations is more likely to overshadow neighbours. For straightforward householder schemes, applying the 45-degree guidance on the submitted plans is often the starting point; for anything larger or more sensitive, a fuller BRE-based assessment is advisable.
Daylight requirements in Reading: which technical standards apply
Reading's adopted policies set the amenity principle, and the House Extensions SPD provides local rules of thumb, but the detailed technical assessment of larger and more complex schemes is carried out against the recognised national standards, applied through the Local Plan:
- BRE guidance – BR 209, Site Layout Planning for Daylight and Sunlight: A Guide to Good Practice (2022 edition). This is the principal methodology for assessing impact on neighbouring properties (using measures such as the Vertical Sky Component and the no-sky line / daylight distribution) and for sunlight to gardens and amenity areas (the Annual Probable Sunlight Hours test, and the guidance that amenity space should receive at least two hours of sunlight on 21 March over at least half its area).
- BS EN 17037 Daylight in Buildings, with the BRE's accompanying guidance, which informs the assessment of internal daylight for the new accommodation itself.
- The National Planning Policy Framework (NPPF), which seeks a high standard of amenity for existing and future occupiers and advises a flexible approach to daylight and sunlight where this would help optimise the use of land in accessible, well-served locations, directly relevant to Reading's town-centre and station-area sites.
When a daylight and sunlight assessment is needed
A formal daylight, sunlight and overshadowing assessment is generally expected for development that could materially affect the light reaching neighbouring properties or amenity spaces, and for taller or larger schemes, with the analysis carried out in line with the latest BRE good-practice guidance. In practice you are likely to need one if your proposal involves:
- A flatted or multi-storey building, or a tall building in the town centre or station area, especially where it adjoins existing homes or public space;
- A two-storey or upper-floor extension close to a boundary where the 45-degree test is breached or borderline;
- A backland or infill plot where new windows sit close to existing dwellings; or
- Any application where the council or neighbours have raised loss of light as a concern.
Preparing a robust assessment early helps demonstrate compliance with Policy CC8 and the House Extensions SPD, anticipates objections, and supports design refinements before submission rather than after a refusal.
A note on town-centre regeneration
Reading's drive to intensify development around the station, the Thames and the town centre means daylight and sunlight are frequently contested at appeal and committee. On constrained urban sites a careful, evidence-led BRE assessment, one that engages honestly with the targets and explains any shortfalls in the context of NPPF's flexibility for accessible urban locations, tends to carry the most weight with officers.
How Fortress Associates can help
Fortress Associates provides our daylight and sunlight report service to BRE BR 209 (2022) and BS EN 17037, prepared to support planning applications across Reading and nationwide. Reports are produced with a 4–5 working day turnaround and no advance payment required. We can also prepare Building Regulations drawings to the Approved Documents (A–S) when your project moves towards construction. To discuss a specific site, get in touch and we will advise whether an assessment is likely to be required.
Sources & further reading
- Reading Borough Council – Local Plan (adopted November 2019)
- Reading Borough Council – Design Guide to House Extensions SPD (adopted March 2021)
- BRE – BR 209: Site Layout Planning for Daylight and Sunlight (2022)
- GOV.UK – National Planning Policy Framework
- Fortress Associates – our services
- See also our companion guide: Daylight Requirements in Portsmouth
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