The daylight requirements in North Warwickshire matter to anyone extending a home or building new dwellings in this rural Warwickshire borough, from the market town of Atherstone in the north to Coleshill in the south. North Warwickshire Borough Council is the local planning authority (LPA) that determines residential applications — Warwickshire County Council is not the LPA for these decisions — and the borough has a clearer set of daylight and sunlight guidance than many neighbouring authorities, thanks to an adopted design SPD that sits alongside its Local Plan.
North Warwickshire is a borough of small market towns and villages, much of it Green Belt, shaped by its industrial past — coal mining, quarrying and Atherstone's historic hatting trade — and now by HS2 and rail-served logistics development in its southern parishes. That blend of tight historic plots and larger edge-of-settlement sites means amenity impacts such as overshadowing and loss of light are a regular part of the planning conversation.
Daylight requirements in North Warwickshire: the adopted Local Plan
The relevant development plan is the North Warwickshire Local Plan (adopted September 2021), which covers the period 2011–2033. Daylight and sunlight are not given a standalone numerical policy; instead they are protected through the plan's development management and design policies. Two policies are central:
- Policy LP29: Development Considerations. This sets out the general tests development must meet. Criterion 9 requires proposals to "avoid and address unacceptable impacts upon neighbouring amenities through overlooking, overshadowing, noise, light, air quality or other pollution". The reference to overshadowing is the direct policy hook for daylight and sunlight loss to neighbours.
- Policy LP30: Built Form. This requires that all development, in terms of its layout, form and density, respects and reflects the existing pattern, character and appearance of its setting. Massing that harms a neighbour's outlook or has an overbearing effect engages this policy as well as LP29.
Because LP29 uses a test of "unacceptable impacts" rather than fixed light targets, applicants demonstrate compliance using recognised technical guidance. The standard methodology is the Building Research Establishment guide Site Layout Planning for Daylight and Sunlight: A Guide to Good Practice — BRE BR 209, third edition (2022) — together with the daylight provision criteria in BS EN 17037, read alongside the National Planning Policy Framework (NPPF), which expects new development to provide a high standard of amenity for existing and future occupiers.
The North Warwickshire householder design SPD
Unusually, North Warwickshire has a supplementary planning document that deals expressly with daylight and sunlight for extensions: "A Guide for the Design of Householder Developments" (September 2003). While dated, it remains a material consideration and gives applicants a clear steer on how officers think about light:
"All house extensions will cast a shadow. The greater the size of the extension and the nearer it is to its neighbour, then the greater that shadowing effect will be. Reduced levels of daylight and sunlight within rooms, gardens, and the associated loss of outlook or overbearing effect, can create a poorer living environment for neighbours." — para 2.19
The SPD applies the well-known 45-degree rule to rear extensions. It advises that a rear extension, whether single or two storey, should not project beyond a line drawn at 45 degrees from the middle of any ground or first-floor rear-facing window serving a habitable room in the neighbouring house (para 2.22). It also notes that single-storey rear extensions will "nearly always be acceptable", with their length limited by proximity to a neighbour's habitable-room windows, while two-storey rear extensions are more likely to be overbearing and should be set away from the common boundary.
How the SPD and BRE guidance work together
The 45-degree rule in the SPD is a useful first screen, but it is a rule of thumb, not a precise daylight calculation. Where a scheme is close to the line, where windows are not directly opposite, or where the SPD is silent — for example, larger residential schemes, flats or backland plots — a calculated assessment to BRE BR 209 (2022) and BS EN 17037 provides the objective figures the council needs to apply LP29 criterion 9. Vertical Sky Component, Annual Probable Sunlight Hours and overshadowing of amenity-area results translate the SPD's qualitative concerns into numbers a case officer can rely on.
When a daylight and sunlight report is worth preparing
A BRE-based assessment is advisable in North Warwickshire where:
- A two-storey or first-floor rear or side extension sits close to a boundary with a neighbour's habitable-room windows and may breach the 45-degree line.
- A new dwelling or flatted scheme is proposed on an infill or backland plot in Atherstone, Coleshill, Polesworth, Water Orton or a similar settlement.
- A larger logistics or mixed-use scheme has a residential interface where overshadowing of nearby homes or gardens is in question.
- A neighbour has objected on loss-of-light or overbearing grounds and objective figures are needed to respond under LP29 and the SPD.
Local factors that influence daylight assessment in North Warwickshire
- Historic market-town grain. Atherstone's tight, long-established plots along and behind Long Street, and similar patterns in Coleshill, mean extensions and infill frequently sit close to neighbours — exactly the situation the 45-degree rule and BRE method are designed to test.
- Green Belt and settlement edges. Much of the borough is Green Belt, so housing is often delivered through infill and intensification within existing boundaries, where light-loss disputes are more likely and early daylight analysis reduces risk.
How Fortress Associates can help
Fortress Associates prepares our daylight and sunlight report service to BRE BR 209 (2022) and BS EN 17037, with results presented to address North Warwickshire Policies LP29 and LP30 and the council's householder design SPD, including the 45-degree rule. We work nationwide with a 4–5 working day turnaround and no advance payment, and we also produce Building Regulations drawings for schemes heading to construction. For an Atherstone, Coleshill or wider North Warwickshire project, get in touch with our team. You may also find our guide on daylight requirements in Nuneaton and Bedworth useful for nearby schemes.
Sources & further reading
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