Whether you are extending a townhouse off Perth's George Street, converting a steading near Crieff or proposing new homes in Blairgowrie, daylight and sunlight are a recurring theme in planning decisions. This guide explains the daylight requirements in Perth and Kinross, how the council assesses amenity, and where the British and European technical standards fit alongside Scottish planning policy.
Perth and Kinross Council is the planning authority for the area, and its decisions are guided by its adopted development plan together with national policy. Daylight is rarely judged by a single number; instead it sits within a wider assessment of residential amenity, placemaking and design quality. A clear, methodical daylight and sunlight report helps a case officer reach a positive view quickly.
The planning framework in Perth and Kinross
The development plan for the area is the Perth and Kinross Local Development Plan 2 (LDP2), adopted in November 2019. It is read alongside National Planning Framework 4 (NPF4), which Scottish Ministers adopted in February 2023 and which now forms part of the statutory development plan for every Scottish council.
Two adopted LDP2 policies are particularly relevant to daylight and amenity:
- Policy 1A: Placemaking – requires development to contribute positively to the quality of the surrounding built and natural environment, respecting the character and amenity of its setting. Protecting the amenity of existing and future residents, including daylight, sunlight and privacy, falls within this placemaking test.
- Policy 2: Sustainable Land Use and the Quality of Place and the design provisions that follow it – these reinforce that new development should not unacceptably harm the amenity of neighbouring properties.
Policy 1A is supported by the council's adopted Placemaking Supplementary Guidance (2020), which sets out the council's expectations on design, layout, orientation and the relationship between buildings. Sunlight, overshadowing and the spacing of dwellings are placemaking considerations under this guidance, so a daylight and sunlight assessment is a practical way to demonstrate compliance.
What NPF4 adds
NPF4 strengthened the national position on amenity. The most directly relevant policies are:
- NPF4 Policy 14 (Design, quality and place) – promotes a design-led approach so that development creates well-designed, sustainable places.
- NPF4 Policy 16 (Quality homes) – expects homes to be designed to address matters including noise, daylight, sunlight, privacy and immediate outlook. This is an explicit national hook for daylight and sunlight, and Perth and Kinross case officers will apply it directly.
Because Policy 16 names daylight and sunlight specifically, a robust technical report is now more useful than ever in supporting an application across the whole council area.
How daylight and sunlight are actually measured
The LDP and NPF4 set the policy expectation, but they do not contain a numerical daylight method. In practice, Perth and Kinross – like authorities across the UK – relies on established technical guidance to put figures behind the policy:
- BRE BR 209, Site Layout Planning for Daylight and Sunlight (2022 edition) – the recognised best-practice methodology for assessing daylight and sunlight to neighbouring and proposed dwellings.
- BS EN 17037, Daylight in Buildings – the European standard for daylight provision within rooms, often used alongside BR 209 for new homes.
A BR 209 assessment typically reports:
Vertical Sky Component (VSC)
VSC measures the amount of skylight reaching a neighbour's window. A figure of around 27% represents a good level of daylight; where a window currently above that figure is reduced to less than 0.8 times its former value, the loss may be noticeable and needs justification.
No Sky Line / Daylight Distribution
This checks how much of a room still receives direct skylight after development. A significant reduction in the sky-lit area of a room can indicate a material loss of daylight.
Annual Probable Sunlight Hours (APSH)
For windows facing within 90 degrees of due south, APSH assesses sunlight across the year. Garden and amenity-space overshadowing is also tested, which is particularly relevant on Perthshire's sloping and rural sites where orientation and topography matter.
The BRE guidance is advisory, not a rigid pass or fail. Context matters – a dense town-centre site in Perth will be judged differently from a generously spaced plot in a Highland Perthshire village. The aim is to show the council that amenity has been properly considered.
Local factors that influence daylight cases
Several characteristics of the Perth and Kinross area shape how daylight and sunlight are weighed in practice:
- Conservation areas and historic settings. Perth city centre, Crieff, Dunkeld, Aberfeldy and many other settlements contain conservation areas and listed buildings. Where extensions or infill are tightly constrained by historic plot patterns, the council balances heritage character against neighbour daylight, and a clear BR 209 analysis helps reconcile the two.
- Rural and sloping topography. Much of the council area is rural Highland Perthshire with significant changes in level. Slopes affect overshadowing and sunlight to gardens, so site-specific modelling is far more reliable than rules of thumb.
- Tight urban plots in Perth and the larger towns. In Perth, Blairgowrie and Kinross, back-land and infill proposals frequently raise overlooking and overshadowing concerns between closely spaced dwellings, where Placemaking SG separation and orientation expectations come into play.
Putting together a strong daylight submission
For most householder and small residential schemes in Perth and Kinross, a well-prepared daylight and sunlight report will:
- Identify the neighbouring windows and amenity spaces that could be affected.
- Model the existing and proposed situation using a 3D method consistent with BR 209 (2022).
- Report VSC, daylight distribution and APSH results against the BRE benchmarks.
- Explain any shortfalls in context, referencing LDP2 Policy 1A, the Placemaking SG and NPF4 Policies 14 and 16.
Supplying this analysis up front reduces the risk of a request for further information later, and gives the case officer the evidence needed to support the application.
How Fortress Associates can help
Fortress Associates provides our daylight and sunlight report service for homeowners, architects and developers across Perth and Kinross and the whole of the UK. We assess your scheme to BRE BR 209 (2022) and BS EN 17037, and present the findings clearly against the relevant LDP2 and NPF4 policies. We also prepare building warrant and Building (Scotland) Regulations drawings where your project needs them. Typical turnaround is 4 to 5 working days, with no advance payment required. Contact us to discuss your site, or read our companion guide on daylight requirements in the Scottish Borders.
Sources & further reading
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