If you are planning an extension in Paisley, a new flatted development in Renfrew or infill housing in Johnstone, daylight and sunlight will usually form part of the council's assessment of your scheme. This guide explains the daylight requirements in Renfrewshire, the policies that apply, and how the recognised technical standards are used to demonstrate that amenity has been protected.
Renfrewshire Council is the planning authority for the area. Daylight is not assessed against a single fixed threshold; it is considered as one element of residential amenity and good placemaking. A clear daylight and sunlight report, prepared to the established methodology, makes it far easier for a case officer to support an application.
The planning framework in Renfrewshire
The statutory development plan for the area comprises the Renfrewshire Local Development Plan, adopted on 15 December 2021, together with National Planning Framework 4 (NPF4), adopted by Scottish Ministers in February 2023. Both documents must be read together when an application is determined.
The Renfrewshire LDP is structured around five themes – Economy, Centres, Infrastructure, Places and Environment. For daylight and amenity, the most relevant provisions are:
- Policy P1: Renfrewshire's Places – requires new development to make a positive contribution to the Place and to be compatible and complementary to existing uses and character, as set out by the New Development Supplementary Guidance and Renfrewshire's Places Design Guidance. Protecting neighbour amenity, including daylight, sunlight and privacy, sits within this test.
- Policy P2: Housing Land Supply – the policy under which most residential proposals are assessed, applied alongside Policy P1 so that new homes deliver good-quality places.
Policy P1 is supported by two adopted documents that carry real weight in decisions:
- The New Development Supplementary Guidance (2022), which provides detailed information on designing, delivering and implementing development with an emphasis on placemaking and sustainable, inclusive development.
- Renfrewshire's Places Design Guidance, which promotes high-quality design that supports and enhances the character and amenity of places within Renfrewshire, including the relationship, layout and orientation of buildings.
What NPF4 adds
NPF4 reinforces the local position with national policy:
- NPF4 Policy 14 (Design, quality and place) – promotes a design-led approach to create 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 a direct national reference to daylight and sunlight that Renfrewshire case officers will apply.
How daylight and sunlight are measured
The LDP and NPF4 set the policy expectation but contain no numerical daylight test. In practice, Renfrewshire – like authorities across the UK – relies on established technical guidance to provide the figures:
- BRE BR 209, Site Layout Planning for Daylight and Sunlight (2022 edition) – the recognised best-practice methodology for assessing daylight and sunlight to existing and proposed homes.
- BS EN 17037, Daylight in Buildings – the European standard for daylight provision within rooms, frequently used alongside BR 209 for new dwellings.
A BR 209 assessment usually reports three measures:
Vertical Sky Component (VSC)
VSC describes how much skylight reaches a neighbour's window. Around 27% is regarded as a good level of daylight; if a window is reduced to less than 0.8 times its previous VSC, the change may be noticeable and needs to be justified.
No Sky Line / Daylight Distribution
This checks how much of a room continues to receive direct skylight after development. A large reduction in the sky-lit area can indicate a meaningful loss of daylight.
Annual Probable Sunlight Hours (APSH)
For windows facing within 90 degrees of due south, APSH measures sunlight across the year. Overshadowing of gardens and shared amenity space is also assessed, which is important for the closely built terraces and tenements found across Paisley and Renfrew.
The BRE figures are guidelines, not rigid limits. A tight urban site near Paisley town centre is judged differently from a more open suburban plot. The objective is to show Renfrewshire Council that daylight and sunlight have been properly considered against Policy P1 and the design guidance.
Local factors that influence daylight cases
Several characteristics of Renfrewshire shape how daylight is weighed in practice:
- Paisley's dense historic townscape. Paisley contains a large historic core with several conservation areas and listed buildings, including the surroundings of Paisley Abbey. Tightly packed terraces and tenements mean back-court overshadowing and overlooking are common considerations, and a clear BR 209 analysis helps reconcile heritage character with neighbour amenity.
- Urban regeneration and infill. Renfrewshire has actively promoted regeneration and brownfield housing in and around Paisley, Renfrew and Johnstone. Infill and back-land schemes frequently raise daylight, overshadowing and privacy questions between closely spaced properties, where the New Development Supplementary Guidance and Renfrewshire's Places Design Guidance set the expectations on spacing and orientation.
- Flatted development and town-centre living. Flatted and mixed-use proposals in the centres need to demonstrate adequate internal daylight as well as protecting existing neighbours, which is where BS EN 17037 room-based assessment is valuable.
Putting together a strong daylight submission
For most householder and small residential schemes in Renfrewshire, a well-prepared daylight and sunlight report will:
- Identify the neighbouring windows and amenity spaces that could be affected.
- Model the existing and proposed arrangement 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 LDP Policy P1, the design guidance and NPF4 Policies 14 and 16.
Providing this up front reduces the chance of a request for further information and gives the case officer the evidence to support a positive recommendation.
How Fortress Associates can help
Fortress Associates provides our daylight and sunlight report service for homeowners, architects and developers across Renfrewshire and the whole of the UK. We assess your scheme to BRE BR 209 (2022) and BS EN 17037 and present the results clearly against the relevant LDP and NPF4 policies. We also prepare building warrant and Building (Scotland) Regulations drawings where they are needed. Typical turnaround is 4 to 5 working days, with no advance payment required. Contact us to talk through your site, or read our companion guide on daylight requirements in Perth and Kinross.
Sources & further reading
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