Daylight, Sunlight and Amenity – Page 15
BRE 209 tests, the 45-degree rule, overshadowing, overlooking and neighbour amenity.
Daylight, Sunlight and Amenity articles – page 15
391 articlesDaylight assessment in dense historic townscapes
In a narrow historic street the existing windows already fall short of the guideline values. Set an alternative benchmark, report against both it and the standard figures, and say plainly where heritage duties limit the design response.
Outlook and sense of enclosure as planning considerations
Sense of enclosure is judged rather than measured, and it can occur where the daylight tests are comfortably passed. Here is how height, proximity and length combine, and what an objection needs to show.
Separation distances and overlooking in local policy
There is no national separation distance. The 21 metre rule sits in local design guides of varying weight, and a reduced distance has to be argued on geometry rather than assertion.
Assessing daylight where the existing room already fails
The 0.8 relative test in BRE 209 punishes rooms that are already dark. Reporting absolute retained values, room use and a justified alternative target is what makes the assessment usable.
Daylight in new flats and the target illuminance approach
Daylight in new flats is assessed against target illuminance sustained over the year, not average daylight factor. Balconies, not glazing area, cause most of the failures.
Rights of light against planning daylight assessment
A favourable daylight and sunlight assessment gives a developer less protection than it appears to. Rights of light are private easements enforced in the civil courts, and they run in parallel.
Overshadowing studies: what an officer expects to see
Shadow plots, sun hours plots and a table of sunlit areas, built on a model that includes the fences. Here is what an overshadowing study should contain and where they go wrong.
The two hour sunlight test for gardens and amenity space
The BRE garden sunlight test is short: half the area, two hours, 21 March, and a 0.8 factor for the change. Here is how it is modelled and how to design a scheme that passes.
Annual probable sunlight hours explained
Annual probable sunlight hours is the measure councils use to judge loss of sunlight to a neighbouring window. Here is what it counts and which windows it applies to.
Vertical sky component and the 27 per cent guideline
VSC is the first daylight number an officer looks at. Here is what it measures, where it is taken, and why the proportional test matters more than the headline figure.
How councils apply the BRE daylight and sunlight guidance
The BRE guide sets numerical guidelines that councils treat as a starting point rather than a pass mark. Here is how officers use them and how to present an assessment they can follow.
Tall building daylight assessment: scoping the study area
The receptor list is where daylight assessments are won and lost. Screen with geometry, record the reasoning, and get the scope agreed before the modelling starts.
Daylight for offices and schools: what changes
Non-residential receptors are not ignored in a daylight assessment, but they are treated differently. Knowing which ones attract protection changes the scope and the argument.
Loss of outlook as a planning ground in its own right
Outlook and daylight are different tests, decided in different ways. Understanding which one an objection is really about changes how you argue it and how you fix the design.
When a daylight assessment is disproportionate for a householder
Most householder schemes do not need modelling. How to check the validation list, what to submit instead, and how to draw the 25-degree section yourself.
Modelling assumptions in a daylight report, and why they matter
Two competent consultants can model the same window and disagree. The six inputs that cause it, and the five things to ask for when you receive someone else's report.
Extending next to a neighbour's conservatory
A conservatory gets less protection than a lounge, but not none. The tests councils apply, why a two-storey extension matters more than the plan suggests, and how to fix it.
Daylight in listed building conversions with fixed windows
You cannot move the windows, so the work moves to evidence and layout. Which standard applies, how to model deep reveals and secondary glazing, and how to justify a shortfall.
Presenting daylight results so an officer can use them
A case officer needs the criteria, a table by window and a conclusion they can quote. Most reports supply the numbers and leave them to build the rest.
Privacy distances between facing windows in dense schemes
Separation standards are local guidance, not national policy. On a dense site the argument is about harm to living conditions rather than about the dimension.
Part O overheating against daylight: the glazing conflict
Overheating limits and daylight standards pull in opposite directions on single-aspect flats. The resolution is in the layout, not in the glass specification.
Obtrusive light from a new development: assessing spill
Light intrusion, glare and sky glow are measured separately and judged against the environmental zone your site sits in. Here is what a lighting submission has to show.
Sunlight to public open space in a new scheme
The sun on ground test applies to communal courtyards and public spaces as well as to gardens. Perimeter blocks often fail it before the landscape plan is drawn.
Balconies and overhangs: the daylight cost to the flat below
Balcony geometry usually costs more daylight than massing does. Inset balconies with solid returns are the worst arrangement, and the fixes only work at concept design.
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