Category Archives: Daylight

Daylight and Sunligt Assessment – London – N4

We have recently been commissioned to undertake a sunlight and daylight assessment in North London (N4).

The project is relatively small involving a roof extension.

We have been provided with plan for the proposal, as well as detailed elevations, and we will prepare a before and after comparison of sunlighting and daylighting conditions.

The BRE209 guide suggests that 20% reduction in lighting levels is acceptable, most projects fall within the 20% allowance.

If you are looking for an environmental consultant in London to undertake a Sunlight and Daylight Assessment then please call or email Southwest Environmental limited we would be very happy to assist and we can also provide design advice.

Daylighting Study – Lambeth – London

Acting on instructions from a much valued repeat client, Southwest Environmental Limited have conducted a Sunlight and Daylight Study in Lambeth, London.

The scope of the study includes for ADF value calculation and a Sun-on-the-Ground calculation, these are explained further below:

ADF- This is used to estimate the level of lighting inside the development prior to construction. In its most basic form it is a measure of window size to room size. i.e. is the window big enough for the room. Other factors also go in to the calculation such as quality of the glass, and whether daylight can reach the window i.e. is the window darkened by near by tall buildings.

Sun-on-the-Ground – A shady cold cool garden can be nice in the summer, but in spring and autumn it can be gloomy. We can work out whether an outdoor area you have proposed will be bright or gloomy. We do this using the BR209 method, which is verging on witchcraft.

Very happy to talk about any of the above so please ring for a discussion about it.

Daylight Assessment for Basement Flat – Haringey

SWEL were approached by a property company in Haringey, London, to undertake an assessment of daylighting in an existing basement flat, with a view to making improvements to to increase daylighting.

A recommended level (ADF) of 1.5% is given for living areas, and the calculated ADF for the living area was around 0.25%.

The existing basement had an open sky angle of around 19 degrees, and an obstruction angle of 50 degrees. A report was published to suggest improvements that saw calculated ADF raised to 1.6%.

Sunlight and Daylight Assessment

Southwest Environmental Limited Weblog

Updates & Discussion

Category Archives: Daylight

Daylight and Sunligt Assessment – London – N4

Daylighting Study – Lambeth – London

Daylighting Study – Lambeth – London

Daylight Assessment for Basement Flat – Haringey

Daylight Assessment for Basement Flat – Haringey