Daylight requirements in Torfaen reflect a county borough of real contrasts. To the south is Cwmbran, a planned post-war new town of generously spaced housing and green wedges; to the north lies the older industrial town of Pontypool and, beyond it, the World Heritage landscape around Blaenavon, where terraces climb the eastern valley side. Whether you are extending a Cwmbran semi or building on a tight hillside plot above Pontypool, Torfaen County Borough Council will expect your proposal to protect the daylight, sunlight and privacy of neighbouring homes.
This guide explains how the local framework treats daylight and amenity, which adopted policies and guidance apply, and how a technical assessment built on the BRE methodology supports a robust application.
The planning framework in Torfaen
The statutory development plan is the Torfaen Local Development Plan (to 2021), adopted in 2013. Although the plan period has ended, it remains the adopted plan used to determine applications while the council prepares its Replacement Local Development Plan. Applicants should keep an eye on the emerging plan, but at the time of writing the 2013 LDP is the document against which proposals are judged.
Above the LDP sits the national framework for Wales: Planning Policy Wales (Edition 12, 2024), Future Wales: the National Plan 2040, and the relevant Technical Advice Notes. Planning Policy Wales places strong weight on placemaking and on protecting the living conditions of existing and future residents, principles that run directly through Torfaen’s local policies and guidance.
Key adopted policy
The central policy for daylight and amenity is:
- Policy BW1 (General Development Policy) — the borough-wide policy against which all proposals are assessed. It contains a set of criteria grouped under headings including Amenity and Design, the Natural Environment, the Built Environment and Design and Transport. Under the amenity and design criteria, development must not cause an unacceptable impact on the amenity of neighbouring occupiers, which the council interprets to include loss of daylight, overshadowing, loss of privacy and loss of outlook.
Because BW1 is criteria-based, it does not set numerical daylight figures itself. The detail is provided in the council’s supplementary planning guidance and in recognised technical standards.
House Extension and Alterations guidance
One feature that distinguishes Torfaen is the precision of its householder guidance. The council’s House Extension and Alterations Supplementary Planning Guidance (adopted 6 December 2022) sets out explicit, measurable amenity tests, including:
- A 25-degree daylight test: if a new building or extension breaches a line drawn at 25 degrees above the horizontal, taken from a point 2 metres above ground level at the neighbour’s window, the existing window is likely to be overshadowed and lose daylight.
- A general 21-metre privacy distance between facing habitable-room windows, which may be adjusted where there are differences in ground level or where dwellings face each other at an angle.
- A requirement that extensions do not cause an unacceptable impact on the outlook or level of daylight to the habitable rooms of the neighbouring dwelling.
These local rules of thumb give applicants a clear starting point, but for anything beyond a simple extension the council and applicants alike rely on a full daylight and sunlight assessment.
How daylight and sunlight are assessed
The accepted technical method for measuring daylight and sunlight impacts is the Building Research Establishment guidance. The current edition is BRE BR 209 – Site Layout Planning for Daylight and Sunlight: A Guide to Good Practice (third edition, 2022), supported by the daylight provision standard in BS EN 17037. These are the documents daylight and sunlight consultants use across the UK, and they are treated as best practice in Wales.
A report will typically apply these tests:
- Vertical Sky Component (VSC) — the skylight reaching a neighbour’s window. Retaining around 27%, or keeping any reduction within 20% of the former value, generally indicates daylight remains satisfactory.
- Daylight distribution (No Sky Line) — how much of a room can still see the sky after development.
- Annual Probable Sunlight Hours (APSH) — sunlight reaching windows facing within 90 degrees of due south.
- Overshadowing of gardens and amenity space — checking that at least half of an amenity area still receives some sunlight on 21 March.
The BRE numerical approach and the council’s 25-degree rule complement one another: the 25-degree line offers a quick screen for householder schemes, while the VSC and No Sky Line analyses provide the detailed, defensible evidence the council needs for larger or more sensitive proposals.
Why Torfaen’s mixed grain matters
In Cwmbran, the new-town layout often gives comfortable separation, but consistent building lines and open frontages mean that an out-of-character extension can still trigger amenity concerns. In older Pontypool and Blaenavon, the picture is closer to the South Wales valleys norm — terraces stepping up steep slopes, short rear gardens and tight spacing — where even a modest rear addition on the uphill side can cast a long shadow over a neighbour. Applying BRE BR 209 in these settings turns the council’s amenity criteria into objective figures that support a sound decision.
For a contrasting urban context, see our guide to daylight requirements in Swansea, where dense terraces and waterfront tall buildings dominate the daylight picture.
How Fortress Associates can help
Fortress Associates prepares clear, robust daylight and sunlight assessments to BRE BR 209 (2022) and BS EN 17037, written to support planning applications in Torfaen and across the UK. Find out more about our daylight and sunlight report service, or see our full range of services. We work to a 4–5 working day turnaround and ask for no advance payment. To discuss your scheme, please use our contact page.
Sources & further reading
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