Understanding the daylight requirements in Stirling matters for anyone proposing a house extension, an infill plot or a larger residential scheme, whether in the city itself, in Bridge of Allan, or in the smaller towns and villages across the council area. Stirling Council is the local planning authority for most of the area, and daylight and sunlight are treated as part of the wider question of residential amenity and good place-making. This guide sets out which adopted policies apply, where local guidance sits, and what a daylight and sunlight assessment to recognised standards actually involves.
Daylight requirements in Stirling: the policy framework
The statutory development plan for the Stirling Council area is made up of two parts: the National Planning Framework 4 (NPF4), adopted by Scottish Ministers on 13 February 2023, and the Stirling Local Development Plan, adopted by the Council in October 2018, together with its adopted Supplementary Guidance. Both must be read together, and applications are determined in accordance with the plan unless material considerations indicate otherwise.
At the national level, two NPF4 policies are most relevant to daylight and amenity:
- Policy 14 (Design, quality and place), which takes a design-led approach and tests proposals against the six qualities of successful places, including creating healthy, safe and pleasant places to live; and
- Policy 16 (Quality homes), which seeks well-designed, sustainable homes that provide good internal and external living conditions for future occupiers.
Good levels of daylight and sunlight, and the avoidance of unacceptable overshadowing or loss of light to neighbours, are part of what these policies mean in practice by amenity and quality of place.
The Stirling Local Development Plan and Placemaking guidance
At the local level, the Stirling Local Development Plan 2018 sets out the design and amenity expectations that apply to new development. The plan is supported by an adopted suite of Supplementary Guidance, including guidance on Placemaking, which expands on how the design policies are applied to layout, daylight, privacy and the relationship between new and existing buildings. In assessing a householder or residential application, officers will look at whether a proposal would unacceptably harm the daylight, sunlight, privacy or general amenity of neighbouring homes, and whether future occupiers of the new development would themselves enjoy reasonable living conditions.
Because the LDP was adopted in 2018, it is read in the context of the later NPF4, and a successor plan (Stirling LDP2) is being prepared. Until that emerging plan is adopted, the 2018 plan and its Supplementary Guidance remain the local part of the development plan and should be cited in any supporting statement.
An important local point: the National Park planning area
One feature that sets Stirling apart from most authorities is that part of the council area lies within the Loch Lomond & The Trossachs National Park. The National Park Authority is a separate planning authority, and it - not Stirling Council - determines planning applications within the Park boundary. Callander, for example, sits within the National Park, so planning applications there are decided by the National Park Authority under its own adopted Local Development Plan, even though Stirling Council remains responsible for building standards in that area. If your site is in or near the Trossachs, it is essential to confirm which authority is the planning authority before relying on Stirling Council's policies. The city of Stirling and Bridge of Allan lie outside the Park and fall under Stirling Council.
How BRE BR 209 fits in
Neither NPF4 nor the Stirling LDP sets out its own numerical daylight calculation. Instead, the recognised technical methodology is the Building Research Establishment guidance, BRE BR 209: Site Layout Planning for Daylight and Sunlight - A Guide to Good Practice (2022 edition), read alongside the British Standard BS EN 17037 on daylight in buildings. These documents are applied as best practice to give objective evidence for the amenity and quality-of-place tests in the adopted policies. In other words, BR 209 provides the measurable tests that let a planning officer judge whether a scheme satisfies the design and amenity aims of NPF4 Policy 14, Policy 16 and the Stirling LDP.
What a daylight and sunlight assessment involves
A BRE-based assessment usually answers two questions: how much daylight and sunlight neighbouring properties will retain, and how much future occupiers of the proposed development will receive. The principal tests include:
- Vertical Sky Component (VSC) - the amount of skylight reaching the centre of a neighbour's window, with a guideline value of 27%, or no worse than 0.8 times its previous value;
- Daylight distribution (the no-sky line) - how well daylight reaches across the depth of a room;
- Annual Probable Sunlight Hours (APSH) - the sunlight reaching windows with a significant southerly aspect, tested across the whole year and the winter months; and
- Overshadowing of gardens and amenity space - using the sun-on-ground test on the equinox, relevant to the generous gardens common in towns such as Bridge of Allan.
A clear, BRE-compliant report helps a Stirling planning officer weigh a proposal against the adopted design and amenity policies. It is particularly useful for two-storey rear or side extensions in the tighter streets of central Stirling, for infill plots in Bridge of Allan, and for any scheme where overshadowing of a neighbour's habitable-room windows or garden is a realistic concern. A robust assessment cannot promise consent, but it gives officers the evidence to reach a sound decision and helps applicants resolve problems before submission.
How Fortress Associates can help
Fortress Associates prepares our daylight and sunlight report service to BRE BR 209 (2022) and BS EN 17037 for projects across Stirling, Bridge of Allan and the wider area. We work nationwide with a typical 4 to 5 working day turnaround and ask for no advance payment. You can see the full range on our services page or contact us to discuss your site. Where a planning submission also needs technical drawings, we produce building warrant and Building (Scotland) Regulations drawings alongside the report. If your project is elsewhere in central Scotland, see our related guide to the daylight requirements in West Dunbartonshire.
Sources & further reading
- Stirling Council - Current Stirling Local Development Plan
- Scottish Government - National Planning Framework 4 (NPF4)
- BRE - BR 209: Site Layout Planning for Daylight and Sunlight (2022)
- Loch Lomond & The Trossachs National Park Authority - Planning
- Fortress Associates daylight and sunlight reports, our services and how to get in touch
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