Can I build a bathroom on top of my kitchen roof?

[NewPlumCat]

Hiya,
I want to know if I can build a bathroom on top.of my flat kitchen roof? Next door property has also got a flat kitchen roof with a bathroom window above it just like mine. Will planning dept give me planning permission?
I have attached pictures as well.
Thank you.

First thing will be whether the flat roof extension is able to take weight of a second floor, you would either need the original plans or to dig a trench so the building inspector can check the foundations...oh and it needs to be a double skin structure as well.

Is that flat roof in the picture all yours or the neighbours as well? If so that makes it more complicated if they are joined.

Usually local planning departments or a builder will be able give you some advice before you submit planning applications.

This.

Also, it the flat roof here is yours and your neighbours then very unlikely as you will be blocking the light from their window.

If the foundations are suitable for two storey you’d be best joining forces and building together a matching extension.

Hello,
Thank you for replying. Yes the flat roof is joined and is my neighbours as well as mine. The window above the next door neighbours flat kitchen roof is a bathroom window. I was just wondering if there's possibly any way round this ?

The window on their side isn't your problem, it's that potentially building a second floor on your side is going to require a party wall agreement if it is even possible. Was it all build as one extension or was one done before the other? Building on your half could significantly impact the structural integrity of their half. You need to look at the original plans or get a builder to advise you.

People do get permission for second floor extensions on the back of but only your local planning department can really decide if it would go ahead. Does anyone on the street have similar....this would set a precedent.

I think you need to ask a proper builder not random
people on Mumsnet

Hi,

Thank you for your reply. I think both properties were built together. There is a house across the road that has had a bathroom built on top of their kitchen and the next door house kitchen got a flat kitchen roof. All of the other houses on my road have all got bathrooms built on their kitchen roofs. Its just my property and the property next door that was built with flat kitchen roofs wuth no bathroomson top of it.

Hello,
I've asked a builder who said it can ve built but the architect who he brought along said its breaching the 45 degree rule.

sounds like the architect is concerned that it would affect their right to light in that part of the house.
your neighbours would likely object and planning would say no.
can you find out it they might be interested in extending too? Have you spoken to them?

Hello,
They are council tenants and can't build as they don't the house.

Then you'd need to get permission from their HA to do it, and it's unlikely they'll want to fund a joint extension.

Hello,
Thank you for your reply. Have HA even done that for any other home?

Just install a carsie and shower on the roof.

Will not need planning permission then (maybe).

Non of us can make that judgement based on a photo but an architect who has seen it in person has said it wouldn't get pp. I would say he is fairly qualified.

He said they may give you permission but only half the size of your kitchen which is 10 foot long.

All housing associations are different, so I don't know what this particular random housing association has done before, but generally it isn't something they are going to fund.

Okay thank you.