Understanding the daylight requirements in Broxbourne is essential for anyone planning a house extension, infill development or larger residential scheme in Cheshunt, Hoddesdon, Waltham Cross or the wider borough. The Borough of Broxbourne sits in south-east Hertfordshire, bordering Greater London and the River Lea, and is the local planning authority (LPA) responsible for determining planning applications across its area. Hertfordshire County Council is not the LPA for these decisions. This guide explains how daylight and sunlight are assessed in Broxbourne, which local policies apply, and how a professional report can support your application.
The planning framework: daylight requirements in Broxbourne
The development plan for the borough is the Broxbourne Local Plan 2018-2033, which was adopted at a Council meeting on 23 June 2020. It sets out the policies the Council uses to determine planning applications, including those that protect the amenity of neighbouring occupiers and require a high standard of design.
Two policies are particularly relevant to daylight and sunlight considerations:
- Policy DSC1 (Design) requires a high standard of design for all development and directs applicants to have regard to the Council's supplementary planning guidance. Good design includes the relationship of new buildings to their surroundings and the living conditions they create.
- Policy EQ1 addresses residential amenity, including the effect of development on the outlook, privacy and overlooking of neighbouring properties. Loss of light to adjoining homes and gardens is a material consideration assessed under this policy.
For extensions and alterations to existing buildings, Policy DSC2 sets out further design expectations, again requiring proposals to respect the character of the area and the amenity of neighbours. Together these policies form the basis on which loss of daylight, sunlight and overshadowing is weighed in Broxbourne.
The Residential Design and Amenity SPG
Broxbourne supports its Local Plan with a Residential Design and Amenity Supplementary Planning Guidance (SPG), adopted in August 2025 following public consultation. This document provides detailed guidance on how the Council applies its design and amenity policies, including expectations around privacy, overlooking distances, private amenity space and the nationally described space standards for new homes. It is the local document that gives practical effect to Policies DSC1, DSC2 and EQ1.
The SPG is applied flexibly, recognising that each site has its own characteristics. Where a scheme could materially affect the light reaching neighbouring windows or gardens, the Council expects applicants to demonstrate that the impact has been properly considered.
How daylight and sunlight are technically assessed
Neither the Local Plan nor the SPG sets out its own numerical daylight calculation method. Instead, in line with national practice and the National Planning Policy Framework (NPPF), the recognised technical benchmark 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. These are the documents a Broxbourne planning officer or appeal inspector will expect a daylight and sunlight report to follow.
A BRE-based assessment typically considers:
- Vertical Sky Component (VSC) - the amount of skylight reaching a neighbour's window, with 27% being the standard benchmark.
- Daylight Distribution (no-sky line) - how well daylight penetrates into existing rooms.
- Annual Probable Sunlight Hours (APSH) - relevant for windows with a southerly aspect.
- Overshadowing of gardens and amenity areas - assessed against the recommendation that at least half of an amenity space should receive sunlight on 21 March.
The familiar 45-degree and 25-degree guidelines, used as a first check for extensions, also feed into this assessment. Where these are breached, a fuller numerical study helps the Council judge whether the impact is acceptable under Policy EQ1.
Local context: development pressures in Broxbourne
Daylight and sunlight issues arise in particular contexts across the borough:
- Brookfield and Park Plaza - the Local Plan identifies major growth around Brookfield Riverside and the Park Plaza employment areas near the A10, where higher-density and taller development brings daylight and overshadowing carefully into focus for both new and existing occupiers.
- The Lee Valley - much of the borough lies within or adjoining the Lee Valley Regional Park and the River Lea corridor, where green space and open character influence how new development is designed and how it affects light and outlook.
- Established residential streets in Cheshunt and Hoddesdon - many applications here are householder extensions and backland plots, where the tight relationship between buildings makes loss of light to neighbours a frequent point of objection.
Because Broxbourne combines suburban density close to London with sensitive river-valley settings, a robust daylight and sunlight assessment is often the difference between a smooth approval and a refusal or appeal.
When you may need a daylight and sunlight report
You should consider commissioning a report if your proposal involves a two-storey or rear extension close to a boundary, a new dwelling on a backland or infill plot, a flatted development, or any scheme where a neighbour has raised concerns about loss of light. A report demonstrates compliance with Policies DSC1, DSC2 and EQ1 and provides the technical evidence officers need.
How Fortress Associates can help
Fortress Associates provides our daylight and sunlight report service for projects across Broxbourne and the rest of the UK. Our reports are prepared to BRE BR 209 (2022) and BS EN 17037, giving planning officers the evidence they need to assess your application against the Local Plan. We offer a 4-5 working day turnaround and require no advance payment. Learn more about our services or get in touch to discuss your project.
Sources & further reading
- Broxbourne Local Plan 2018-2033 (Borough of Broxbourne Council)
- Broxbourne supplementary planning guidance, including the Residential Design and Amenity SPG
- BRE BR 209: Site Layout Planning for Daylight and Sunlight (2022)
- National Planning Policy Framework (GOV.UK)
- Related guide: Daylight Requirements in East Hertfordshire
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