Right to Light Guidelines
Right to Light is a legal easement test - separate from Daylight & Sunlight (BRE 209) used for planning. Our specialists help you interpret the guidelines and case-law principles, screen risk early, and shape designs that minimise exposure while protecting viable floorspace
What are “Right to Light guidelines”?
“Guidelines” refers to accepted technical methods and thresholds used to assess whether a neighbouring qualifying window retains sufficient light. While planning relies on BRE guidance, Right to Light considers the legal easement: does your proposal cause a material injury? Outcomes range from design cut-backs to damages in lieu of injunction—hence the need for early screening and clear evidence.
2-4 Ringers Road, Bromley
Wadworth Brewery, New Park Street
360, 17 Marlborough Street, Bristol
Right to Light Guidelines vs BRE Daylight & Sunlight
| Topic | Right to Light (Legal Guidelines) | Daylight & Sunlight (BRE 209 Planning) |
|---|---|---|
| Purpose | Protect a legal easement to “sufficient light” for qualifying windows; identifies injury. | Assess amenity for planning; informs officer/committee decisions. |
| Decision-maker | Parties/insurers via settlement; ultimately the courts if litigated. | Planning officers and committees using BRE guidance. |
| Method / Metrics | Rights-to-light modelling; window-by-window sufficiency tests; injury thresholds. | VSC, NSL, APSH and internal daylight (e.g., DF/UDI) as scoped. |
| Typical Outputs | 3D model, schedules, quantified injuries, mitigation & settlement strategy. | Results tables, narratives and drawings supporting the application. |
| Outcomes / Risk | Injunction (cut-backs) or damages in lieu; insurance may apply. | Approval, conditions or refusal; design iteration to address shortfalls. |
| Design Levers | Setbacks, step-backs, chamfers, cut-backs, lightwells targeted at worst receptors. | Re-massing, layout changes, larger glazing/reflectance strategies. |
| Key Insight | Passing BRE does not eliminate legal exposure; scope RoL separately. | BRE is guidance (not law); justified shortfalls may still be acceptable. |
Where guidelines matter most
- Tight urban grain with close-by rear windows
- Vertical additions (mansards, dormers, rooftop/airspace)
- Deep rear/side-return extensions on terraced streets
- Infill/mews plots with multiple neighbours
- Estate regeneration with phasing and varied baselines
Faq
Got questions about right to light in London?
Below are answers to the most common right to light questions we receive from London homeowners, architects and developers covering law, process, fees and what to send us.
No. BRE is a planning guide; Right to Light addresses a legal easement. You can pass BRE and still face RoL exposure.
At RIBA 0–2 or pre-app when massing can still change. Early screening avoids costly late redesigns.
BRE outcomes help the planning narrative, but RoL is decided on the legal test of sufficient light. Treat them as parallel workstreams.
Existing/proposed plans, sections, elevations, storey heights and roof forms. DWG ideal; scaled PDFs acceptable.
Often. Setbacks, step-backs, chamfers, local height trims and lightwells targeted at worst receptors provide strong gains with minimal GIA loss.