Daylight Requirements in Angus

The harbour and coastline at Arbroath in Angus, Scotland

Understanding the daylight requirements in Angus matters to anyone planning a house extension, an infill home or a larger residential scheme anywhere in the council area, whether that is the burgh streets of Forfar, the harbour and abbey town of Arbroath, the elegant townhouses around Montrose, or the smaller communities of Brechin, Carnoustie, Monifieth and Kirriemuir. Angus Council is the planning authority for the whole area and determines householder and residential applications against its adopted development plan. This guide explains how daylight, sunlight and overshadowing are considered locally, which policies apply, and what an assessment to recognised best-practice standards involves.

Daylight requirements in Angus: the planning framework

In Scotland the development plan has two statutory parts. The first is National Planning Framework 4 (NPF4), adopted by the Scottish Ministers in February 2023, which sits alongside the council's local plan as part of the statutory development plan. The second, locally, is the Angus Local Development Plan, adopted in September 2016. A new Angus Local Development Plan is being prepared under the post-2019 plan-making system, but at the time of writing the 2016 plan remains the adopted local document and is read together with NPF4.

For daylight, sunlight and residential amenity the two most directly relevant local policies in the adopted Angus Local Development Plan are Policy DS3: Design Quality and Placemaking and Policy DS4: Amenity. Policy DS3 expects new development to deliver a high standard of design that respects the character and pattern of its surroundings, while Policy DS4 protects the amenity of existing and future occupiers. Among the factors the council weighs under these policies are overlooking and loss of privacy, outlook, sunlight, daylight and overshadowing. Where a proposal could have such an impact, the council may require applicants to submit detailed assessments so that the effect on neighbouring living conditions can be properly judged.

Supplementary guidance and householder advice

Angus Council expands on these policies through adopted supporting documents. The Design Quality and Placemaking Supplementary Guidance (adopted 2018) sits alongside Policy DS3 and explains what the council considers a satisfactory residential environment, including the protection of daylight, sunlight and privacy for neighbours and for the occupiers of new homes. The council's Householder Development Planning Advice Note (September 2016) offers practical advice for extensions and alterations, the type of project where overshadowing of a neighbour's windows or garden is the most common amenity concern.

None of these documents sets out a uniquely Angus daylight formula. Like most Scottish planning authorities, Angus does not publish a bespoke numerical daylight and sunlight standard. Instead the qualitative amenity language of Policy DS4 and the design expectations of Policy DS3 are tested, in practice, against the recognised national methodology described below.

How NPF4 reinforces good amenity

NPF4 strengthens the design and amenity case. Policy 14 (Design, quality and place) asks development to be designed to a high quality that improves the quality of life of people living there, drawing on the Six Qualities of Successful Places (places that are healthy, pleasant, connected, distinctive, sustainable and adaptable). A pleasant, healthy place is one with good access to daylight and sunlight and without unacceptable overshadowing. Policy 16 (Quality homes) seeks well-designed, sustainable homes and, for larger schemes, looks to how a proposal improves the residential amenity of the surrounding area. Together with the adopted Angus policies, these provide the policy hooks against which a daylight and sunlight assessment is weighed.

How daylight and sunlight are actually measured

Because neither the Angus Local Development Plan nor NPF4 prescribes its own daylight metrics, the established 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 the recognised UK best-practice approach and are routinely used by Scottish planning authorities, including Angus, as the evidence base for assessing amenity and design impacts under local and national policy. They translate the qualitative language of Policy DS4 and NPF4 Policy 14 into objective, repeatable tests.

A BRE-based assessment looks both at the daylight and sunlight enjoyed by neighbouring properties and at the conditions that 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 former 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, assessed across the whole year and during the winter months;
Overshadowing of gardens and amenity areas - using the sun-on-ground test on the equinox, relevant to the generous garden settings common in Angus burghs and rural villages.

A clear, BRE-compliant report gives an Angus planning officer the objective evidence needed to judge a proposal against Policy DS3 and Policy DS4 and the design expectations of NPF4. It is particularly valuable for the tightly grained, traditional streets of Arbroath and Montrose, for two-storey side and rear extensions in Forfar and Carnoustie, and for backland or infill plots where a new building could overshadow an established neighbour. A robust assessment cannot promise consent, but it gives the council sound evidence on which to base a decision and helps applicants design out problems before they submit.

Common Angus projects that benefit from an assessment

Daylight and sunlight questions arise most often where buildings sit close together or where new development changes the relationship between neighbours. In Angus these typically include:

Rear and two-storey side extensions in the older parts of Arbroath, Montrose and Brechin, where terraced and semi-detached homes share boundaries;
Infill and backland housing in Forfar, Kirriemuir and Carnoustie that introduces a new building behind or between existing homes;
Conversions and roof alterations near conservation areas, where the council will look closely at both design quality and neighbour amenity.

In each case, presenting a BRE-based assessment up front helps an application run more smoothly and demonstrates to officers and neighbours that amenity impacts have been taken seriously.

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 Angus, including Forfar, Arbroath, Montrose, Brechin, Carnoustie and Kirriemuir. 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 project also needs building warrant drawings under the Building (Scotland) Regulations and the Scottish technical handbooks, we can prepare those too. You may also find our sibling guide on the daylight requirements in Argyll and Bute useful if your work spans more than one Scottish council.

Sources & further reading

daylightsunlightAngusBRE BR 209NPF4Local Development Planresidential amenityplanning

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