Daylight requirements in Pembrokeshire (Sir Benfro) matter wherever a new home, extension or development could reduce the light reaching a neighbouring property — from the historic streets of Haverfordwest and Pembroke to the smaller towns and villages across the county. Pembrokeshire County Council is the planning authority for most of the county, and it assesses these impacts through its adopted Local Development Plan and the wider Welsh planning framework. This guide explains how daylight requirements in Pembrokeshire are applied and how to give your application the best chance of a smooth decision.
Daylight requirements in Pembrokeshire and the local planning framework
Planning decisions in Wales are made against the relevant adopted development plan together with national policy. For most of Pembrokeshire that plan is the Pembrokeshire Local Development Plan, adopted on 28 February 2013. It remains the statutory development plan for the council's area until it is replaced by the emerging Local Development Plan 2, which is being progressed through examination. Until that replacement is adopted, the 2013 plan continues to govern how amenity — including daylight and sunlight — is assessed.
An important local point: large parts of Pembrokeshire, including the coast around Tenby and stretches of the Cleddau, fall within the Pembrokeshire Coast National Park, which is a separate planning authority with its own Local Development Plan. The County Council determines applications outside the National Park boundary — covering towns such as Haverfordwest, Milford Haven, Pembroke and Pembroke Dock — while proposals inside the park are dealt with by the National Park Authority. It is worth checking which authority covers your site before you apply.
Within the County Council's area, two policies do most of the work on light and amenity:
- Policy GN.1 (General Development Policy) — the council's overarching development management policy. It requires that development is compatible with the character and capacity of the area and does not cause unacceptable harm to local amenity, expressly including visual impact, loss of light and loss of privacy.
- Policy GN.2 (Sustainable Design) — requires development to be of a high standard of design that responds positively to its site and surroundings, which includes the relationship to neighbouring buildings and the amenity they enjoy.
Because Policy GN.1 names loss of light directly as a potential harm, daylight and sunlight impact is a material consideration in the great majority of residential applications in Pembrokeshire — from a two-storey rear extension in Haverfordwest to a small infill scheme in Pembroke.
How daylight impact is judged in practice
The County Council's adopted plan keeps the policy test broad, leaving the technical judgement to be applied case by case. In practice, planning officers look at:
- Loss of daylight to habitable-room windows of neighbouring homes — living rooms, bedrooms and kitchens carry the most weight.
- Loss of sunlight, particularly to south-facing windows and to gardens used for sitting out.
- Overbearing and enclosing impact, where a tall or deep structure looms over a neighbour even if measured light loss is modest.
- Overshadowing of gardens and amenity space.
For straightforward householder work, officers often apply familiar geometric checks such as the 45-degree line taken from a neighbour's nearest window. For larger or more sensitive proposals, a numerical daylight and sunlight assessment provides the objective evidence the council needs to apply GN.1 and GN.2 with confidence.
Planning Policy Wales and national context
Above the local plan sits the Welsh Government's national framework. Planning Policy Wales (Edition 12, 2024) puts placemaking and good design at the centre of the planning system, and the amenity of existing and future occupiers — including access to natural light — is part of that design quality. Future Wales: the National Plan 2040 sets the national spatial strategy within which Pembrokeshire's plans sit, and Technical Advice Note 12 (Design) reinforces the expectation that daylight, sunlight and privacy are properly considered. These documents do not set numerical daylight thresholds themselves, which is why recognised technical guidance is used to measure impact.
How daylight and sunlight are measured
The accepted UK methodology for measuring daylight and sunlight is published by the Building Research Establishment:
- BRE BR 209 (2022), Site Layout Planning for Daylight and Sunlight: A Guide to Good Practice — the standard reference for assessing daylight to neighbouring windows (using the Vertical Sky Component and the no-sky-line / daylight distribution test), sunlight (the Annual Probable Sunlight Hours test) and overshadowing of gardens and open space.
- BS EN 17037, Daylight in Buildings — the European standard for daylight provision, sunlight, view out and the avoidance of glare within new dwellings.
A report prepared to these standards translates the council's amenity policies into measurable figures, and helps resolve a neighbour's concern before it becomes a reason for refusal.
Practical tips for Pembrokeshire applicants
- Confirm the right authority. Check whether your site is inside the Pembrokeshire Coast National Park or within the County Council's area, as the development plan and contacts differ.
- Identify the sensitive receptors. Note neighbouring habitable-room windows and gardens that could be affected before finalising your design.
- Test the geometry early. A simple 45-degree check often shows whether a rear extension is likely to be acceptable.
- Commission a BRE assessment when it is marginal. Two-storey extensions, infill plots and flats benefit most from numerical evidence under GN.1.
How Fortress Associates can help
Fortress Associates prepares our daylight and sunlight report service to BRE BR 209 (2022) and BS EN 17037, tailored to the policies that apply in Pembrokeshire. We assess the impact on neighbouring properties and the daylight available within your own scheme, and present the findings clearly for submission with your application. We work nationwide with a typical turnaround of four to five working days and ask for no advance payment. We also prepare Building Regulations drawings where a project needs them. To discuss a Pembrokeshire site, please contact our team.
Sources & further reading
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