What a lighting & daylighting audit covers
A lighting and daylighting audit assesses the quantity, quality, and circadian appropriateness of natural and artificial light through a dwelling. It covers daylight factor measurement, luminaire output, colour rendering index, glare risk, and circadian-rhythm-supporting illuminance patterns. Audits inform retrofit decisions on glazing, blinds, and lighting design.
- Daylight factor measurement room-by-room
- Lux-level measurement against task and ambient norms
- Luminaire CRI / CCT assessment
- Glare risk evaluation (UGR where applicable)
- Circadian-supporting profile review (CCT shift, intensity)
- Recommendations on glazing, blinds, fitting choice, and dimming
Typical findings
- Bedrooms with insufficient daylight provision (DF<1.5%)
- Open-plan living areas over-relying on downlights with poor CRI
- Living spaces with no daylight at the back of deep plans
- Cool-white-only luminaires preventing evening melatonin onset
- Glare from west-facing glazing in summer evenings
Typical cost: £350-£700 typical residential audit, £600-£1,200 with detailed circadian-pattern recommendations and lighting-design proposal
When to book: Before retrofitting glazing, blinds, or luminaires; when household members report sleep difficulty, low mood, or seasonal-affective patterns; or as part of a broader healthy-home assessment for vulnerable occupants.
Required qualifications for assessor: CIBSE-accredited Society of Light & Lighting member, ILP (Institute of Lighting Professionals) accreditation, or registered Daylighting Designer with BRE Daylight & Sunlight protocol training