45 degree rule

  






The 45 degree rule is a technique used in architecture and planning permission to determine if a proposed change or build will block sunlight and obscure how much of it can enter the windows of a neighboring property .

The rule can be measured horizontally and vertically, and the measurements are taken from the nearest "habitable room" of the neighboring property .

The 45 degree rule is used to ensure that any extension work done to a house does not impinge on the neighbors' outlook or access to light.

The rule is designed to provide a fair balance between the wishes of the property owners who want to build and improve their homes and the "right to light" of the people living in the neighboring properties by protecting the outlook from the rooms of the neighboring properties and guaranteeing daylight into them.

The 45 degree rule is suited to residential dwellings and also non-domestic situations, where occupants have a reasonable expectation of daylight.

The above taken from the internet when I typed into google "45 degree planning "

Some website for reference .

(2022) The 45 Degree Rule Explained | CK Architectural

What is the 45 degree rule and why is it important? — Reviews (jabdesign.co.uk)

Designing for daylight - 45 and 25 degree test (firstinarchitecture.co.uk)

The 45 Degree Rule for Extensions: The One Architectural Tip You Should Know - Urbanist Architecture - Small Architecture Company London

45 Degree Rule Fact Sheet (right-of-light.co.uk)

https://youtu.be/OlDAHJAe7ZM





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