Right to light in bedrooms

[Houseplanning]

Our proposed extension meets 45 degree rule on horizontal plans but when apply vertical can see there will be a partial shadow to affected window for a short time (depending on month of year) and only in afternoon.

BRE guidelines seem to suggest this is ok as a bedroom not a living area but does anyone have an idea what the tolerance threshold would be to be acceptable?

manyvthanks

Not sure I understand the horizontal/vertical part. But sounds like you're using the full 45 degrees at 1st floor level? We're doing an extension and decided to go to 45 degrees downstairs (4.5m out) but less upstairs (3.5m), as we just couldn't do that to our lovely neighbour. We're lucky that we have a very wide plot so the new bedroom upstairs will be 3.5x5.5m ie much wider than it is deep. You're perfectly within your rights to use the maximum allowed, but remember you have to live next door to your neighbour :-)

Thanks for the reply @Scottishgirl85 !

we are doing a double storey and like you coming our less on the top floor.
They have built right up to the boundary and we have put a gap in to mitigate light impact but still will have a slight shadow but only a small time in day

Sounds reasonable then. In our previous extension we built up to boundary but stepped in by 1m on 1st floor. I can't imagine you'd be allowed up to boundary on 1st floor. Have you allowed for this?

Hmmm well you’re changing things up
so there will be impact. But I don’t think the bedroom is a habitable room in the same way a living room is. if a massive tree four houses away is allowed to block the afternoon sun from our bedroom window (clearly not bitter 😂) … right to light is a bit subjective. As long as you’re minimising impact and within regulations and your neighbour is aware. You can never tell. We wanted to go out the full 6m. Our neighbour said we should only go out 4m to be in line with their own ground floor extension. We said we would split the difference as a compromise and go out to 5m (lowering the eaves height by 75cm. They still complained because it wasn’t what they told us we could do 🤷‍♀️ Hopefully your neighbours are more reasonable.

Our neighbour wanted a balcony. We didn’t like it but it didn’t affect any of our rooms. However a neighbour’s bedroom was around 4m away. Yes a bedroom is a habitable room. Balcony didn’t get pp. Not a light issue but distance.

As above, here you'd be very unlikely to get permission for a double storey extension all the way to the boundary (think it was allowed in the past, not so much now). We had to be 2m in from our adjoining neighbour on the 1st floor and 1m in from the boundary.