There are many well-known scientifically proven benefits. Buildings which provide high levels of natural light generally have more positive working environments than those which are dependent upon artificial light. It is known that people respond better to working in natural light conditions, as the eye and brain functions work better, resulting in improved concentration and overall performance. Plus, of course less dependency on artificial light significantly reduces energy consumption and running costs as well as impacting positively on the buildings overall carbon footprint.
Thermally efficient insulated rooflights can further reduce heat loss and energy costs. These benefits, and the effectiveness of rooflights as a contributor, are acknowledged in the Building Regulations Approved Document Part L. It recommends that industrial and commercial building structures should have a rooflight area of 10% to 20%.
This graph demonstrates the reduction in CO2 emissions of a typical notional building as the rooflight area is increased to the optimum 16% to 18% and used in conjunction with a fully automated lighting control system.
Source: SBEM results – CO2 emissions for the Notional Building at varying rooflight area; graph 1, NARM NTD06: Designing with Rooflights 
For further information on specifying rooflights, please contact our team on 01327 701920 or email firstname.lastname@example.org. Alternatively, take a look at our RIBA approved seminar or download a NBS Specification Clause.