Daylight, Sunlight and Amenity – Page 9
BRE 209 tests, the 45-degree rule, overshadowing, overlooking and neighbour amenity.
Daylight, Sunlight and Amenity articles – page 9
391 articlesDaylight targets for new rooms and how they are tested
Daylight inside new dwellings is now assessed against illuminance targets rather than daylight factors. Here is how the tests work and what the model has to state.
Sunlight to gardens and amenity areas on 21 March
Gardens are tested on one date: 21 March. At least half the area should receive two hours of direct sunlight, with a further comparison where an existing garden loses out.
Daylight for a single storey rear extension on a bungalow
A low extension can still fail a daylight test when the neighbouring window is at the same level. Here is the section check to run before the drawings are finished.
Sun on ground for allotments and community growing space
Growing plots need more sun than a garden, and the standard equinox test misses the summer loss. Here is how to measure overshadowing of allotments and frame an objection that carries weight.
When a neighbour's room is served by two windows
Window-by-window daylight results mislead when a room has more than one opening. How to model the room, handle corner rooms and rooflights, and report without cherry picking.
Loss of light to a commercial glasshouse or nursery
Residential daylight methods do not answer an objection from a nursery. What to model, what the crop evidence can honestly show, and where economic loss stops being material.
Daylight to hotel and care home bedrooms
BRE guidance covers non-domestic buildings where occupants have a reasonable expectation of daylight. For a care home that points at the lounge as much as the bedroom.
Roof terraces and neighbour privacy in flatted schemes
An open terrace is judged differently from a window because the view is sustained, outdoors and downward. Screens, setbacks and sightline sections are what carry the case.
Overshadowing from trees rather than buildings
There is no right to light from a tree. How the high hedges regime works, where tree shading is material in planning, and which remedies are realistic.
Daylight to a basement flat served by a lightwell
In a basement conversion the lightwell sets the daylight result, not the building opposite. Geometry, finishes, grilles and the layout moves that work when a test fails.
Daylight and sunlight in a conservation area roof extension
Upward extensions in conservation areas fail daylight tests at the top of the facade, where heritage constraints block the usual design fixes. How to test and present both cases.
How to challenge a daylight report you did not commission
Daylight objections succeed on factual errors, not on general concern. Here is how to obtain the full report, test the baseline and assumptions, and write an objection an officer can act on.
Wind microclimate and pedestrian comfort at street level
Wind assessment asks whether the ground around a building suits the activity planned there. Here is how the comfort categories work, which method to use and what mitigation survives value engineering.
Sun on ground studies for playgrounds and play space
A courtyard can pass the BRE amenity test on aggregate while the play area sits in permanent shade. Assess the play space polygon separately and report shade as well as sun.
Daylight where the neighbouring site is consented but unbuilt
The existing condition stays the baseline. A consented but unbuilt neighbouring scheme belongs in the report as a second scenario, with a view on whether it will ever be built.
Daylight for an infill extension on a terraced house
Filling a side return puts a new flank wall beside one neighbouring window at close range. Two measurements tell you whether you have a problem before you commission anything.
Outlook and enclosure as amenity considerations
A scheme can pass every daylight target and still be refused as overbearing. Here is how outlook and enclosure are tested and what evidence carries the argument.
Overshadowing an existing solar array as a planning issue
Shading a neighbour's array is capable of being a material consideration, but it is not a right. Here is the evidence that carries weight and the design responses that work.
When the use of a neighbour's room is disputed
Classify a neighbour's room wrongly and the daylight result changes. Here is which rooms are sensitive, what evidence decides a dispute and how to present both cases.
Balconies and recessed windows in daylight assessments
An overhead balcony slab removes the brightest part of the visible sky. Here is how to test the options early and reconcile daylight with amenity space policy.
Applying daylight targets flexibly in a dense urban context
The national daylight guidance says its numerical values should be applied flexibly. Doing that credibly needs a surveyed local baseline and the standard results reported in full alongside.
BS EN 17037 and illuminance targets for new flats
Internal daylight in new flats is assessed by illuminance over area and over time, not by obstruction geometry. The targets, the two permitted methods and where single aspect layouts fail.
The 25 degree line test before you commission modelling
A section, a line at 25 degrees from the centre of the lowest window, and a decision on whether detailed daylight modelling is needed at all. The screening test, drawn properly.
Daylight mitigation conditions and how they discharge
A daylight condition works when it fixes a specification an officer can verify. Here is what can be conditioned, how the wording should read, and what happens when the scheme moves at technical design.
Not sure which documents your council will ask for?
Enter your postcode and PlanScope recommends the right reports for your project, then drafts them in minutes.
Enter your postcode on PlanScope