Anyone planning an extension, a new dwelling or a residential development in the Forest of Dean should understand the local daylight requirements in Forest of Dean before drawing up plans. Forest of Dean District Council is the local planning authority (LPA) for this part of Gloucestershire — the county council does not decide these applications — so proposals are assessed against the District's adopted development plan, its design guidance and national policy. This guide sets out how daylight and sunlight are considered locally and how a professional report can support your application.
The planning framework: the Core Strategy and Allocations Plan
The adopted development plan for the District comprises two documents: the Forest of Dean Core Strategy (adopted February 2012) and the Allocations Plan 2006–2026 (adopted June 2018). These are applied alongside the National Planning Policy Framework (NPPF). The key policy for design and amenity is:
- Policy CSP.1 – Design and environmental protection. This policy requires that the design and construction of new development takes into account the important characteristics of the environment and conserves, preserves or otherwise respects them. In practice the Council assesses development in terms of light, outlook, privacy, noise and general disturbance, expecting a high standard of amenity for both existing and future occupiers — an approach that mirrors the NPPF's requirement for good standards of amenity.
Loss of daylight, loss of sunlight and overshadowing of neighbouring homes and gardens are material considerations under this policy, as is the adequacy of daylight within proposed new homes. The Allocations Plan's district-wide policies reinforce these amenity protections for new development.
Daylight requirements in Forest of Dean: the guidance that applies
Unlike many districts, the Forest of Dean has genuinely useful local design guidance. The Council has adopted two relevant supplementary planning documents (SPDs):
- the Residential Design Guide, covering the design and layout of residential developments, extensions and alterations; and
- the Residential Design Guide for Alterations and Extensions, a companion document focused specifically on works to existing homes.
These guides set out the Council's expectations on how new development should relate to its neighbours and respect the highly distinctive character of the Forest area. However — and it is important to be accurate about this — they do not set their own numerical daylight and sunlight targets. For the technical measurement of daylight and sunlight, the recognised national methodology is applied through Policy CSP.1 and the SPDs. Assessments are carried out against:
- BRE BR 209 (2022) – Site layout planning for daylight and sunlight: a guide to good practice, the standard reference for impacts on neighbours (Vertical Sky Component, daylight distribution / the no-sky line, and the Annual Probable Sunlight Hours test);
- BS EN 17037 – the British Standard for daylight provision within new and altered buildings;
- the NPPF – which expects good standards of amenity and supports a flexible approach to daylight and sunlight where strict application would prevent efficient use of land.
The Council's validation requirements mean that, where a proposal could affect a neighbour, supporting information addressing amenity impacts such as overshadowing and overlooking may be needed for the application to be progressed.
Why the Forest of Dean's setting matters for daylight
The District takes its name and character from one of England's largest ancient woodlands — the Statutory Forest of Dean — and much of its southern and eastern edge lies within the Wye Valley National Landscape (formerly the Wye Valley Area of Outstanding Natural Beauty). Mature tree cover, wooded skylines and steep, undulating ground around the principal towns of Cinderford, Lydney and Coleford all influence how sunlight reaches buildings and gardens. Trees and changes in level can already limit daylight on a plot, and a new building added into that context can compound the effect. Because of this, an objective, evidence-based daylight and sunlight assessment is often the clearest way to show a council officer (and concerned neighbours) that a scheme is acceptable.
When to commission a daylight and sunlight report
- Your proposal could reduce daylight or sunlight to a neighbour's habitable-room windows or garden.
- A neighbour has objected, or the planning officer has raised overshadowing, overlooking or loss of light under Policy CSP.1.
- You are designing flats or a higher-density scheme and need to demonstrate adequate internal daylight under BS EN 17037.
- You want to test a design early, before submission, to reduce the risk of refusal or redesign.
A report prepared to BRE BR 209 (2022) gives the Council figures it can rely on and can also be used to rebut an unjustified objection.
How Fortress Associates can help
Fortress Associates is a UK daylight and sunlight consultancy operating nationwide, including across the Forest of Dean. We prepare our daylight and sunlight report service to BRE BR 209 (2022) and BS EN 17037, referenced to the relevant development plan policies, so your application is backed by clear, defensible evidence. We typically deliver assessments in 4–5 working days and ask for no advance payment. We can also produce Building Regulations drawings where your project needs them. To discuss your scheme, please contact us.
Related reading
For nearby districts in Gloucestershire, see our guides to daylight requirements in Stroud and daylight requirements in Cotswold.
Sources & further reading
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