Planning Permission - Bay Window
Planning Permission - Bay Window
Author
Discussion

NomadicTurbo

Original Poster:

1,070 posts

96 months

Friday 12th December 2025
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Trying to get my head round what is required from Building Regs & Planning Permission to replace a leaking bay window flat roof.

We currently have a lead flat roof on our ground floor bay window, which is now split and taking in water. Speaking to a few different roofing companies, they've all suggested changing it from lead to Firestone Rubber.

Does this fall under Permitted Development as it will not alter the size of the roof?

My thinking is that Building Regs are required as the material of the roof will be changed. I'm awaiting a response from the local Building Regs office.

Quhet

2,774 posts

168 months

Friday 12th December 2025
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Unless the appearance of the roof is changed significantly (or a listed building), you shouldn't require PP for this

NomadicTurbo

Original Poster:

1,070 posts

96 months

Friday 12th December 2025
quotequote all
Quhet said:
Unless the appearance of the roof is changed significantly (or a listed building), you shouldn't require PP for this
Thankyou, as I thought

Little Lofty

3,784 posts

173 months

Friday 12th December 2025
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I doubt Building control will be interested, most people don’t even apply for it when recovering the main roof so I wouldn’t worry about a bay window. Adding some insulation would be their main requirement but it’s not always possible. I’ve got one to do soon, it’s very deep and a weird shape, I had considered rubber but think I’m going to use fibre glass, I’m not a massive fan usually as you need perfect weather, but this bay can be covered if the weather turns nasty.

wolfracesonic

8,785 posts

149 months

Friday 12th December 2025
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Just crack on with it, as Lofty said and alittle insulation is also a good idea while it’s uncovered. Don’t be put off lead if you have the money, it’s probably one of, if not the most durable roofing materials out there.
I’m guessing the problem with your lead top is that it has been installed in one piece, with thermal movement causing it to crack. This can be overcome by installing mop stick rolls to break the roof up in to two or three sections. Be aware that not all roofers are leadworkers!



Panamax

8,042 posts

56 months

Friday 12th December 2025
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^^^ That looks a decent bit of lead work. And a bizarre bit of wiring.

wolfracesonic

8,785 posts

149 months

Friday 12th December 2025
quotequote all
Panamax said:
^^^ That looks a decent bit of lead work. And a bizarre bit of wiring.
Not mine I must admit, just a pic grabbed off t’internet.

PRO5T

6,849 posts

47 months

Friday 12th December 2025
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Depends on your local LA, ours are st hot on roof coverings at the mo. Our brickies are doing another job alongside one of mine and the BC officer pulled them on the new roof going on the connection to the extension.

Tiles and felt to tiles and breathable membrane, "that'll need our sign off" and an extra application.

JoshSm

3,236 posts

59 months

Friday 12th December 2025
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Building Regs - as much the 'thy shall upgrade' parts as anything - shouldn't come as a surprise as a roofing job is easy to spot unlike other jobs that in theory also need BC but no-one bothers.


Sebring440

3,054 posts

118 months

Friday 12th December 2025
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wolfracesonic said:
Panamax said:
^^^ That looks a decent bit of lead work. And a bizarre bit of wiring.
Not mine I must admit, just a pic grabbed off t internet.
You're about to be sued! rofl

https://www.pistonheads.com/gassing/topic.asp?h=0&...