Understanding the daylight requirements in Tandridge is essential for anyone planning a residential extension, a backland infill scheme or a new dwelling across this largely rural Surrey district. Tandridge District Council is the local planning authority (LPA) for the area — not Surrey County Council — and it is the District that decides householder and residential applications against its adopted Local Plan. This guide sets out where daylight and sunlight sit within that policy framework and how a robust technical assessment supports a smoother application.
Tandridge is an unusual district to design in. Around 94% of its land is designated Green Belt, framed by the North Downs and the Surrey Hills, with the main settlements of Caterham, Warlingham, Whyteleafe, Oxted, Lingfield and Caterham-on-the-Hill carrying most of the development. That mix of constrained edge-of-settlement plots and tight historic street patterns means amenity impacts — including overshadowing and loss of light — are scrutinised carefully by officers.
Daylight requirements in Tandridge: the adopted policy position
Tandridge does not have a single policy headed "daylight and sunlight". Instead, the protection of light to neighbouring homes is delivered through the District's residential amenity and design policies. The adopted development plan currently comprises the Tandridge District Core Strategy (adopted October 2008) and the Tandridge Local Plan Part 2: Detailed Policies 2014–2029 (adopted July 2014), alongside several made neighbourhood plans.
The most directly relevant policy is Policy DP7: General Policy for New Development in Local Plan Part 2. DP7 sets criteria that all new development must address, including two that bear directly on daylight and sunlight:
- Criterion 6 (Amenity) requires that a proposal "does not significantly harm the amenity of neighbouring properties by reason of pollution (noise, air or light), traffic, or other general disturbance".
- Criterion 7 (Privacy) requires that a proposal does not significantly harm the amenities and privacy of neighbours "by reason of overlooking or its overshadowing or overbearing effect". DP7 goes on to state that, in most circumstances where habitable rooms would be in direct alignment, a minimum privacy distance of 22 metres will be required, and a minimum of 14 metres between principal windows of existing dwellings and the blank walls of new buildings.
The word "overshadowing" in criterion 7 is the policy hook for daylight and sunlight: a development that casts excessive shadow over a neighbour's windows or garden, or that has an overbearing massing effect, can be refused under DP7 even where the privacy distances are met. At the strategic level, Policy CSP18 of the 2008 Core Strategy reinforces this by requiring new development to be of a high standard of design that respects character and does not significantly harm the amenities of occupiers of neighbouring properties.
How the policy is interpreted in practice
Because DP7 uses the test of "significant harm" rather than fixed numerical daylight targets, the council relies on established technical guidance to judge whether harm is acceptable. The recognised industry 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. These are the tools an applicant uses to demonstrate, with calculated figures, that criterion 6 and criterion 7 of DP7 are satisfied.
Is there a Tandridge daylight and sunlight SPD?
No. At the time of writing, Tandridge District Council has not adopted a supplementary planning document (SPD) dealing specifically with daylight and sunlight, and its local validation requirements do not list a standalone daylight/sunlight assessment as a blanket submission requirement for householder applications. In the absence of bespoke local numerical guidance, the position is straightforward: daylight and sunlight are assessed under DP7 and CSP18, using BRE BR 209 (2022) and BS EN 17037 as the technical benchmark, and read in the light of the National Planning Policy Framework (NPPF), which expects new development to provide a high standard of amenity for existing and future users.
That said, design detail in Tandridge is also shaped by other adopted material. The District has several made neighbourhood plans — including the Caterham, Chaldon and Whyteleafe Neighbourhood Plan (2021) and the Limpsfield Neighbourhood Plan (2019) — and conservation area appraisals and village design statements referenced in DP7. A proposal in one of these areas should be checked against the relevant neighbourhood-level design expectations as well as the district-wide amenity tests.
When a daylight and sunlight report is worth preparing
Even though Tandridge does not mandate a report in every case, a BRE-based daylight and sunlight assessment is strongly advisable where any of the following apply:
- A two-storey or first-floor extension sits close to a boundary shared with a neighbour's habitable-room windows.
- A backland or garden-land plot is being developed behind existing homes, where DP7 garden-land and amenity tests are engaged.
- A flatted or higher-density scheme is proposed within Caterham, Oxted or another settlement where plots are tight.
- A neighbour has objected on grounds of loss of light or an overbearing effect, and you need objective figures to respond.
Submitting calculated Vertical Sky Component, Annual Probable Sunlight Hours and overshadowing results up front allows the case officer to weigh the proposal against DP7 criterion 7 with confidence, rather than relying on a subjective judgement of "overshadowing".
Local factors that influence daylight assessment in Tandridge
Two characteristics of the District shape how daylight is considered:
- Sloping topography of the North Downs. DP7 itself notes that privacy distances may need to be increased where sites are sloping. The hillside settlements around Caterham-on-the-Hill and the Downs above Oxted mean that levels frequently affect how a development reads against neighbours — a point that a competent daylight and sunlight assessment captures through accurate 3D modelling of ground levels.
- Green Belt and settlement-edge constraints. With roughly 94% of Tandridge in the Green Belt, much new housing is delivered through infill and intensification within existing settlement boundaries. Tighter plots increase the likelihood of light-loss disputes, making early daylight analysis a valuable risk-reduction step.
How Fortress Associates can help
Fortress Associates prepares our daylight and sunlight report service to BRE BR 209 (2022) and BS EN 17037, presenting clear Vertical Sky Component, Annual Probable Sunlight Hours and overshadowing results that respond directly to Tandridge Policy DP7 and CSP18. We work nationwide with a 4–5 working day turnaround and no advance payment. We also produce Building Regulations drawings where a scheme is moving towards construction. To discuss a Caterham, Oxted or wider Tandridge project, get in touch with our team. If your scheme is over the county border, see our related guide on daylight requirements in North Warwickshire.
Sources & further reading
- Tandridge District Council – Adopted development plan (Core Strategy 2008 and Local Plan Part 2 Detailed Policies 2014)
- BRE BR 209: Site Layout Planning for Daylight and Sunlight (2022)
- National Planning Policy Framework (NPPF)
- Fortress Associates daylight and sunlight reports
- Our planning and Building Regulations services
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