Getting to grips with daylight requirements in East Lothian matters whether you are extending a home in Musselburgh, building a new house in Haddington or developing a coastal site in North Berwick or Dunbar. East Lothian Council is the planning authority for the county, and when it assesses a proposal it considers how the development affects the daylight, sunlight and privacy enjoyed by neighbouring homes. This article sets out the planning framework that applies, the council's own design guidance, and how a professional daylight and sunlight report can strengthen your application.
The planning framework in East Lothian
Planning applications in East Lothian are determined against the statutory development plan, which has two parts. The first is National Planning Framework 4 (NPF4), adopted by the Scottish Government in February 2023 and now part of the statutory development plan across Scotland. The second is the East Lothian Local Development Plan 2018 (LDP), which was adopted on 27 September 2018 and replaced the previous East Lothian Local Plan 2008.
The policies most relevant to daylight and residential amenity are:
- NPF4 Policy 14 (Design, quality and place) and Policy 16 (Quality homes), which require new development to be well designed and to deliver good residential amenity, including suitable levels of daylight and sunlight.
- LDP 2018 Policy DP1 (Landscape and Settlement Character) and Policy DP2 (Design), which together form the core of the LDP's design chapter and require development to be of a high design quality and to respect the amenity of existing and surrounding properties.
- LDP 2018 Policy DP4 (Development Mix), which calls for a masterplan on major proposals and informs how new housing layouts are designed.
It is also worth noting that East Lothian Council is preparing a new Local Development Plan 2 (LDP2), which as of the council's 2025 Development Plan Scheme was at the evidence-gathering stage ahead of submitting an Evidence Report to the Scottish Government. Until LDP2 is adopted, the 2018 LDP remains the adopted plan for decision making.
The Design Standards SPG and how daylight is assessed
The LDP 2018 is supported by the council's Design Standards for New Housing Areas Supplementary Planning Guidance, which gives practical detail on how the design policies are applied to residential layouts. The guidance is explicit that the way buildings are arranged and orientated is ‘required to ensure daylight and privacy’, and it sets expectations for how homes overlook streets and open space without causing unacceptable overlooking of neighbours.
For privacy between dwellings, the SPG looks at the relationship between facing windows and gardens. It refers to back-to-back and window-to-space separation, indicating distances in the order of 20 to 30 metres in typical housing layouts to balance daylight, outlook and privacy, with garden ground and orientation used to manage overlooking. The guidance also addresses garden sizes and the way rear parking courts and greens should be well overlooked, all of which interact with daylight and amenity.
Like the great majority of Scottish councils, East Lothian does not set a single bespoke numerical daylight formula in the LDP. Instead, where a proposal could affect the daylight or sunlight of neighbouring homes, the council expects the assessment to follow recognised best practice.
BRE best practice and the daylight tests
The recognised methodology for assessing daylight and sunlight in the UK is the Building Research Establishment (BRE) guide, BR 209, ‘Site Layout Planning for Daylight and Sunlight: A Guide to Good Practice’, in its 2022 edition, together with the British and European standard BS EN 17037. These are applied in East Lothian to support the amenity and design aims of LDP Policies DP1 and DP2 and NPF4 Policies 14 and 16. In practice this typically involves:
- A 25 degree rule of thumb: where a new building or extension subtends an angle of more than 25 degrees from the horizontal at the centre of a neighbour's window, a more detailed daylight study is advisable.
- A 45 degree test: used to judge the effect of extensions set at an angle to a neighbour's window, in both plan and elevation.
- Detailed BRE calculations where the rules of thumb are exceeded, including daylight distribution, the average daylight factor and annual probable sunlight hours.
For new homes themselves, BS EN 17037 provides target daylight levels for habitable rooms and recommendations on sunlight to living spaces, which is increasingly relevant to flatted and higher-density schemes in the East Lothian growth corridor around Wallyford, Blindwells and Musselburgh.
What this means for your project
A daylight and sunlight assessment is most often needed in East Lothian where:
- An extension or new building would exceed the 25 degree line from a neighbour's principal windows;
- A new house or flatted block sits close to existing homes;
- Facing windows or gardens fall short of the separation distances the council looks for;
- A planning officer or a neighbour raises overshadowing, overlooking or loss of light.
An objective, BRE-based report submitted with your application gives the case officer clear evidence to work from and helps resolve neighbour concerns with measurements rather than assertion. In conservation areas such as Haddington town centre or the historic core of North Berwick, where buildings sit close together, this evidence can be particularly valuable.
How Fortress Associates can help
Fortress Associates provides a professional daylight and sunlight report service prepared to BRE BR 209 (2022) and BS EN 17037, the recognised best-practice methodology that East Lothian applies in support of its LDP 2018 and NPF4 design and amenity policies. We run the 25 and 45 degree checks, carry out the detailed BRE daylight and sunlight calculations where required, and review privacy and separation distances so your submission is backed by clear evidence. We work UK-wide with a turnaround of 4 to 5 working days and no advance payment, and we also prepare building warrant and Building (Scotland) Regulations drawings. To discuss a project in Haddington, Musselburgh or North Berwick, please get in touch.
Sources & further reading
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