Understanding the daylight requirements in Midlothian matters to anyone planning a house extension, a loft or attic conversion, a new dwelling or a flatted development in Dalkeith, Penicuik, Bonnyrigg, Loanhead, Gorebridge or Mayfield. Midlothian Council is the planning authority for the area, and it assesses how a proposal affects the daylight, sunlight and privacy of neighbouring homes against the policies in its adopted development plan and supporting design guidance. This article explains how those requirements work in practice and how a professional daylight and sunlight report can support your application.
The planning framework in Midlothian
Planning decisions in Midlothian are made 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, which now forms part of the statutory development plan across the whole of Scotland. The second is the council's own Midlothian Local Development Plan 2017 (MLDP), which was adopted on 7 November 2017. A replacement plan, Local Development Plan 2, is currently in preparation, so until it is adopted the 2017 plan remains the local statutory basis for decisions.
Two policy strands are most relevant to daylight and amenity:
- NPF4 Policy 14 (Design, quality and place) and Policy 16 (Quality homes), which require development to create well-designed, sustainable places and to provide good-quality residential amenity, including adequate daylight and sunlight.
- MLDP Policy DEV 2 (Protecting Amenity within the Built-Up Area) and Policy DEV 6 (Layout and Design of New Development), which together protect the amenity of existing and future occupiers and set the council's expectations for the standard of design and layout.
What the Midlothian Local Development Plan says
The MLDP is explicit that amenity, including daylight, is a core test. In its design chapter the plan states that, as a minimum, new developments must meet basic functional requirements such as “satisfying privacy, sunlight and daylight levels in order to preserve the quality of life of residents”. This is the clearest statement in the plan that daylight and sunlight are material to how an application is decided.
Policy DEV 2 protects amenity within existing and future built-up areas. It provides that development will be permitted within these areas, and in particular within residential areas, unless it is likely to detract materially from the existing character or amenity of the area. Infill, intensification, conversion and redevelopment of windfall sites within established neighbourhoods are precisely the situations where loss of daylight or overlooking can arise, so DEV 2 is frequently engaged for projects in the older parts of Dalkeith and Bonnyrigg.
Policy DEV 6 requires good design and a high quality of architecture in both the overall layout of a development and its constituent parts. Among its criteria, the plan asks that a high standard of passive energy gain should be achieved and that overshadowing of buildings should be avoided, and that the relationship of buildings to one another and the spaces between them respect the character of the area. Overshadowing and the spacing of buildings are exactly the issues a daylight and sunlight assessment addresses.
The Quality of Place supplementary guidance
The detail behind these policies is found in the council's Supplementary Guidance on Quality of Place, which is referenced throughout the MLDP design chapter. The plan confirms that this guidance “sets out the criteria that must be complied with in all proposals for the extension or alteration of dwellings”, and that it includes detailed aspects relating to the layout of new development and the design of new housing and house extensions and alterations. For householders, this is the document a planning officer will turn to when judging whether a rear or side extension would harm a neighbour's light or privacy.
Midlothian also publishes focused householder supplementary planning guidance, including separate notes on dormer windows and on rear extensions to single-storey terraced and semi-detached houses. These reflect the closely spaced housing typical of Midlothian's former mining and mill settlements, where extensions are the most common source of daylight and overshadowing concerns.
Like most Scottish councils, Midlothian does not write its own bespoke numerical daylight metric into the plan. Instead, the detailed assessment is carried out using nationally recognised best practice. In daylight and sunlight work that means the Building Research Establishment (BRE) guide BR 209, ‘Site Layout Planning for Daylight and Sunlight: A Guide to Good Practice’, in its 2022 third edition, alongside the British Standard BS EN 17037. These provide the recognised tests that demonstrate compliance with the amenity aims of DEV 2, DEV 6 and NPF4.
The tests a BRE assessment applies
A BRE-based daylight and sunlight assessment typically considers:
- The 25 degree rule of thumb – if an obstruction rises at more than 25 degrees from the horizontal, measured from the centre of a neighbour's lowest window, daylight may be at risk and detailed checks are needed.
- The 45 degree test – used to judge the effect of extensions built at an angle to a neighbour's window, on both plan and elevation.
- Vertical Sky Component and daylight distribution – the BRE's detailed measures of how much skylight reaches a window and how it spreads across a room.
- Annual Probable Sunlight Hours – a check on sunlight to principal living rooms and to garden and amenity spaces.
What this means for your project
Whether you are extending a terrace in Penicuik, building a new home on a windfall plot in Bonnyrigg or developing flats in Dalkeith town centre, the council will want to be satisfied that your proposal does not materially harm the daylight, sunlight or privacy of neighbours, in line with DEV 2 and DEV 6 and the Quality of Place guidance. A daylight and sunlight assessment is most often requested where:
- An extension or new building would breach the 25 degree line from a neighbour's window;
- A new dwelling or flatted block sits close to existing homes;
- A rear or side extension to a terrace or semi could cause overshadowing or a tunnel effect;
- A planning officer or objector raises overshadowing, overlooking or loss of light.
Producing a clear, BRE-based report at the application stage helps an officer reach a positive recommendation and answers neighbour objections with objective evidence rather than assertion.
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 Midlothian Council applies in support of its MLDP 2017 design and amenity policies and NPF4. We assess the 25 and 45 degree tests, run the detailed BRE daylight and sunlight calculations where needed, and check privacy and overshadowing so your application is supported by clear evidence. We work UK-wide with a turnaround of 4 to 5 working days and no advance payment. We also prepare building warrant and Building (Scotland) Regulations drawings. To discuss your project in Dalkeith, Penicuik or Bonnyrigg, please get in touch.
Sources & further reading
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