Designing for Daylight & Sunlight
How our designs bring natural light into every project
Daylight is more than a desirable feature – it’s fundamental to well-being, energy performance and great architecture. At Mark Fairhurst Architects we know that designing for daylight, matters so we treat daylight and sunlight analysis as a design driver from the first sketch through to technical delivery. Below we explain why it matters, how we work, and what we’ve learned from a range of London projects.
1 | Why designing for daylight matters
- Health & comfort – Good daylight reduces eyestrain, boosts mood and supports circadian rhythms, helping occupants sleep better and feel more alert.
- Energy efficiency – Naturally lit buildings rely less on artificial lighting and reduce heating demand when south-light is harnessed responsibly.
- Planning success – Demonstrating minimal impact on neighbours and excellent internal light levels strengthens planning applications – especially on tight urban sites.
- Asset value – Light-filled spaces photograph well, sell faster and command premiums in both residential and commercial markets.
2 | Early-stage strategy
Before we draw a line, we map:
| Key check | Typical tools | Outcome |
| Site orientation & overshadowing | BRE “25° / 45°” rules of thumb, sun-path overlays | Optimal massing envelope |
| Neighbour amenity | Vertical Sky Component (VSC) sketches | Early risk flag for right-to-light claims |
| Internal layout
| Quick Average Daylight Factor (ADF) tests
| Avoid north-only single-aspect homes • Prioritise living rooms within 90° of due south |
These rapid assessments allow us to iterate schemes quickly and avoid costly redesigns later.
3 | Planning-stage analysis
As the concept firms up we build detailed 3-D models of both the proposal and its context. Using a range of methods we:
- Calculate VSC, ADF and Annual Probable Sunlight Hours (APSH) for every sensitive window.
- Plot ‘no-sky’ lines across neighbour floor plates to visualise daylight distribution.
- Optimise the envelope—sometimes shaving a parapet or chamfering a roof brings every window within BRE guidance without sacrificing area.
For complex or contentious sites, we commission independent consultants to peer-review our work, giving planning officers and neighbours additional confidence. Both the BRE Site Layout Planning for Daylight and Sunlight (BR 209 2022 edition) and BS EN 17037 are treated as flexible guidelines; we balance them with London Plan density objectives and local character.
4 | Technical design moves
In dense city plots, creativity is key:
- Lightwells & courtyards – Draw daylight deep into basements or tight back-to-back blocks.
- Large-scale roof-lights & clerestories – Flood double-height spaces while preserving privacy.
- North-facing glazing – Harvest diffuse, glare-free light (ideal for studios and offices).
- Selective solar control – External brises-soleil, opening vents and low-e glass mitigate overheating without losing clarity.
5 | Designing for Daylight: Project spotlights
| Project | Design move | Result |
| Tonsley Place, Wandsworth
| Roof height modelled to protect ground-floor flats; north-facing glass roof over living areas | Three townhouses approved with zero daylight objections |
| Riversdale Road, N5
| Structural glass roof and full-height window link new kitchen to mature garden | Dramatic garden views with daylight factor uplift to basement level |
| Chagford Street, Westminster
| Atelier-scale roof-lights with external shading built into a pitched roof | Six mews houses gain south light while respecting listed neighbours |
| Troy Wharf, nr Rickmansworth
| North-facing glazed curtain wall + rear light-chimney
| Day-lit single-aspect offices with panoramic countryside view |
| Shirland Mews, Maida Vale
| Clerestory strips & stair-well roof-lights on a land-locked sliver site | Two houses naturally lit without overlooking or privacy concerns |
| George Street, Croydon
| Oversized pitched roofs with central skylights
| Dramatic vaulted apartments & privacy from surrounding offices |
| Chingford Road, Waltham Forest
| Massing tuned by daylight calcs; basement lightwells offset flank-wall windows | 9 homes over 5 storeys on on a former restricted garage yard |
| Albion Grove, Stoke Newington
| Stepped rear terraces + twin lightwells
| Residential gardens meet BRE sunlight targets despite tall context |
| Hafer Road, Battersea
| Central lightwells convert deep plan into 16 bright flats
| Double the unit count of the existing block with increased standard of accommodation |
| Clapham Road
| New basement lightwell + structural glass lid
| Dark storage space reborn as sunlit master bedroom suite |
6 | Right-to-light: protecting your project
Even with planning consent, UK neighbours may claim loss of light under common law. We therefore:
- Identify potential ‘injured’ windows early and test them against Waldram methodology.
- Advise on mitigation—from façade modulation to financial allowances – so clients proceed with eyes open.
7 | Designing for daylight: Looking ahead
With tighter overheating regulations and London’s Net-Zero targets, designing for daylight using daylight analysis is more crucial than ever. Our team stays ahead through strong industry partnerships – including with BRE – ongoing CPD, RIBA Conservation expertise, and lessons learned from completed projects.
Ready to bring more light into your project?
Whether you’re densifying a brownfield site, extending a Victorian terrace or unlocking a complex mixed-use brief, an early designing for daylight strategy can save time, delight occupants and protect value. Book your FREE consultation with Mark Fairhurst Architects to discuss how we can illuminate your next scheme.