Understanding the daylight requirements in Rushmoor is essential for anyone planning an extension, a loft conversion or a new home in Aldershot, Farnborough or the surrounding wards. Whether you are a householder adding a two-storey side extension or a developer bringing forward a town-centre regeneration scheme, the way your proposal affects light to neighbouring properties can make the difference between a smooth consent and a refusal. This guide explains how Rushmoor Borough Council assesses daylight and sunlight, which policies and guidance apply, and where a professional daylight and sunlight report adds value.
Who decides planning applications in Rushmoor?
Rushmoor Borough Council is the local planning authority (LPA) for the borough, which covers the towns of Aldershot and Farnborough. Although Hampshire County Council deals with strategic matters such as minerals, waste and education, it is the borough council that determines householder and residential applications and that sets the local planning policy framework. So when you are checking the daylight requirements that apply to your site, it is Rushmoor's adopted documents you need to follow, not the county's.
Rushmoor has a distinctive character. Farnborough is internationally known for its military aviation heritage, home to the historic airfield and the biennial air show, while Aldershot is recognised as the “Home of the British Army”. Both town centres have been the focus of long-term regeneration, which means a steady flow of higher-density residential and mixed-use proposals where daylight and sunlight analysis is frequently a determining issue.
The adopted Rushmoor Local Plan
The development plan for the borough is the Rushmoor Local Plan, adopted on 21 February 2019, which guides the location, scale and type of development up to 2032. It contains the detailed development management policies against which planning applications are assessed.
The most relevant policy for daylight and sunlight is Policy DE1 (Design in the Built Environment). Policy DE1 requires that new development “make a positive contribution towards improving the quality of the built environment” and, among other criteria, that it does not cause harm to the proposed, existing and/or adjacent users by reason of… loss of light, privacy or outlook. In other words, loss of light is written directly into the borough's design policy as a potential reason for refusal.
Two further parts of Policy DE1 matter for light. The policy asks that development “take account of adjacent building heights, fenestration, roof and cornice lines” and that larger schemes demonstrate, through a design and access statement, how context including scale, massing and orientation has been analysed. Orientation and massing are precisely the factors that govern how much sunlight a building receives and how much it overshadows its neighbours.
Amenity space is addressed separately under Policy DE3 (Residential Amenity Space), which sets minimum useable private garden space — 15 sq m for one to two person dwellings and 30 sq m for family houses. While this is a space standard rather than a daylight test, the usability of that garden is closely linked to overshadowing, so the two are often considered together.
Rushmoor's daylight guidance: the Home Improvements and Extensions SPD
Unusually, Rushmoor offers clear, published guidance on how it assesses light. The Home Improvements and Extensions Supplementary Planning Document (SPD), adopted on 19 February 2020, elaborates upon Policy DE1 and is a material consideration in deciding householder applications. It is one of the more explicit daylight guidance documents among Hampshire's district councils.
The SPD defines amenity as including “daylight, sunlight, privacy, outlook, the absence of overbearing impacts” and sets out how the council tests for harm. Critically, it states that the council may apply the BRE's ‘45-Degree Test’ as a “rule of thumb”. The guidance explains:
To do this, on a plan and in elevation, draw a line at a 45-degree angle from the centre point of the nearest window serving a habitable room of an adjoining property… If the 45-degree line is breached by the extension, this indicates that the extension could result in a significant reduction in light… we may ask you to set the extension back from the boundary or ask you to submit a daylight and sunlight assessment which will examine in more detail whether or not there would be a harmful impact.
This is significant. It tells you exactly when Rushmoor is likely to request a formal daylight and sunlight assessment: where a rear or side extension breaches the 45-degree line to a neighbour's habitable-room window. The SPD specifically flags rear extensions to semi-detached and terraced properties, and corner-plot extensions, as cases where loss of daylight, sunlight and overbearing impact must be carefully managed.
What does the BRE guidance actually require?
The 45-Degree Test is only a first screen. Where it is breached, or for larger schemes, the recognised technical methodology is the Building Research Establishment's BRE BR 209, “Site layout planning for daylight and sunlight: a guide to good practice” (2022 edition). BR 209 sets out the established numerical tests — Vertical Sky Component (VSC), the no-sky line / daylight distribution, and the Annual Probable Sunlight Hours (APSH) test for sunlight — together with overshadowing assessment of amenity areas. These quantitative methods are what a planning officer will expect to see in a daylight and sunlight report submitted in response to the SPD. Internal daylight provision for new dwellings is assessed against BS EN 17037, the European daylight standard.
Validation: when is a daylight assessment required?
Rushmoor publishes a local validation list (most recently updated in April 2025) setting out the supporting documents needed to register an application. The list does not impose a blanket requirement for a standalone daylight and sunlight assessment on every application. Instead, the trigger comes through the SPD and through Policy DE1: where the 45-degree screen is breached, or where a proposal's scale and massing raise a credible concern about loss of light to neighbours, the council can require a daylight and sunlight assessment as a material consideration. For householder schemes a Design and Access Statement is often expected, and the design considerations it must address can readily encompass daylight and overshadowing.
The practical takeaway: if your extension or development is close to a boundary and a neighbour has habitable-room windows facing the works, you should expect light to be scrutinised, and a proactive BRE-based assessment can resolve the question before it delays your application.
Local context worth noting
- Town-centre regeneration: Both Aldershot and Farnborough town centres are subject to regeneration ambitions in the Local Plan, generating taller, denser residential schemes where daylight, sunlight and overshadowing of existing homes and new flats are key assessment criteria.
- Conservation areas and heritage: Where a proposal sits in or near a conservation area, Policies HE1, HE3 and HE4 also apply, and the relationship of new massing to historic fenestration and roof lines (a Policy DE1 criterion) interacts directly with light considerations.
How Fortress Associates can help
Fortress Associates prepares our daylight and sunlight report service to BRE BR 209 (2022), BS EN 17037 and the relevant Local Plan, giving you the technical evidence Rushmoor's SPD and Policy DE1 call for. We work nationwide with a 4–5 working day turnaround and require no advance payment. We also offer Building Regulations drawings. If the 45-Degree Test has been breached or an officer has asked for more detail, a clear VSC, daylight distribution and APSH analysis is often the fastest route to resolving the concern. Contact us to discuss your scheme. You may also find our guide on daylight requirements in Basingstoke and Deane useful if you are working elsewhere in Hampshire.
Sources & further reading
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