Understanding the daylight requirements in Flintshire is important for anyone planning an extension in Mold, a new dwelling near Deeside, or a residential scheme elsewhere across the county. Flintshire County Council (Cyngor Sir y Fflint), as the local planning authority, assesses how a proposal affects the daylight, sunlight, privacy and outlook of neighbouring properties, and whether new homes themselves will offer an acceptable standard of amenity. This guide explains how those expectations sit within Flintshire's recently adopted planning policy and its detailed design guidance, and how a professional daylight and sunlight report can support your application.
The planning framework that applies in Flintshire
Decisions in Flintshire are made under the Welsh planning system, starting with the adopted development plan and supported by national policy. Flintshire is notable among the assigned Welsh areas for having a recently adopted plan:
- The Flintshire Local Development Plan 2015–2030, formally adopted on 24 January 2023. This is an up-to-date adopted plan – it replaced the former Flintshire Unitary Development Plan and is the primary basis for determining planning applications.
- Planning Policy Wales (Edition 12, 2024) and Future Wales: The National Plan 2040, which set the national framework for good design and placemaking.
- Relevant Technical Advice Notes (TANs) and the council's adopted Supplementary Planning Guidance Notes (SPGNs).
How Flintshire's adopted policies address daylight and amenity
The Flintshire LDP does not express a single numerical daylight target. Instead, the protection of light, privacy and outlook runs through its strategic and development-management policies. The most relevant are:
- Policy STR4: Principles of Sustainable Development, Design and Placemaking – the strategic design policy setting the overarching expectation for high-quality, well-considered development.
- Policy PC2: General Requirements for Development – the general development-management policy, under which proposals must safeguard the amenity of neighbouring occupiers and provide acceptable conditions for future residents.
- Policy PC3: Design – the detailed design policy addressing layout, scale, massing and the relationship of new development to its surroundings.
- Policy HN2: Density and Mix of Development – which sets an efficient-use-of-land density (around 30 dwellings per hectare), making the careful handling of spacing, overlooking and light essential on tighter sites.
In practice, when officers assess a Flintshire scheme they consider whether it causes unacceptable overlooking, loss of privacy, overshadowing or an overbearing impact – and whether minimum interface distances from neighbouring development are achieved. These are precisely the matters a daylight and sunlight assessment quantifies.
Flintshire's Supplementary Planning Guidance Notes
Flintshire backs its LDP policies with a series of adopted SPGNs that give the practical detail. Two are central to daylight and amenity:
- SPGN No.2: Space Around Dwellings – sets the council's minimum standards for garden areas, parking spaces, site boundaries, distances between properties with overlooking windows, and distances to plot boundaries. It is the document officers use to test separation and privacy in new residential layouts.
- SPGN No.1: Extensions and Alterations to Dwellings – gives detailed guidance for householder works, including the council's use of the 45-degree code to judge loss of light.
SPGN No.1 explains the 45-degree code clearly: a 45-degree line is drawn from the relevant neighbouring window, and if the proposed extension would project beyond that line it would probably result in an unacceptable loss of light. The guidance also advises that, to minimise overlooking, windows at first-floor level on extension walls close to a boundary should be omitted or fitted with obscured, non-opening glazing, and that two-storey extensions should not normally be within 2 metres of a boundary forming a party wall between terraced or semi-detached properties (or 1 metre of other properties). For loft works, it favours rooflights as a less intrusive alternative to dormers where overlooking is a concern.
Where BRE BR 209 and BS EN 17037 fit in
The 45-degree code is a useful first check, but for more sensitive proposals – flatted schemes, backland plots, or development that adds significant height close to neighbouring windows – the recognised national best-practice methodology is the Building Research Establishment guide Site Layout Planning for Daylight and Sunlight: A Guide to Good Practice (BRE BR 209, 2022 edition), together with the daylight provisions of BS EN 17037.
These provide the numerical tests that planning officers and inspectors recognise, including:
- Vertical Sky Component (VSC) – daylight reaching a neighbouring window, with the well-known 27% benchmark and the guidance that a reduction to below 0.8 times the former value is likely to be noticeable;
- No Sky Line / daylight distribution – how far daylight penetrates into a room;
- Annual Probable Sunlight Hours (APSH) – the sunlight received, particularly for south-facing windows and gardens.
A BRE-based report converts the qualitative aims of Policies PC2 and PC3 and the 45-degree code into measurable evidence, which is usually the most convincing way to demonstrate compliance.
Practical tips for Flintshire applicants
- Start with the SPGNs. Test your layout against Space Around Dwellings (SPGN No.2) and run the 45-degree code from SPGN No.1 before finalising your design.
- Watch the density. Policy HN2's efficient-use-of-land density can intensify overlooking and overshadowing on smaller sites – check interface distances early.
- Treat first-floor windows carefully. Near a boundary, obscured non-opening glazing or omitting the window altogether can resolve privacy objections.
- Commission a report where impact is likely. If your proposal is close to neighbouring windows or adds height, a daylight and sunlight assessment provides the evidence Policies PC2 and PC3 call for.
How Fortress Associates can help
Fortress Associates provides our daylight and sunlight report service for projects across Flintshire and the rest of the UK. We prepare assessments to BRE BR 209 (2022) and BS EN 17037, presented clearly for submission to Flintshire County Council, and we can also produce Building Regulations drawings for the same project. We work to a 4–5 working day turnaround and ask for no advance payment. To discuss your scheme, get in touch.
Sources & further reading
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