Front Dormer Advice Needed for Planning a Loft Conversion

[Dirty_Bertie]

Hi all.

First post so hope I’ve not made any mistake :)

I’m looking to get a loft conversion and from what I understand, getting a front dormer can be difficult.

I can’t get one on the back as my roof backs into another house (it’s end of terrace but faces out) so back dormer isn’t an option. See photo from above. The red box is my house.

Just wondered if anyone thought it was worth a try? No houses on my street have them, apart from a block of flats, which has them by design (see attached photo). The flats were built like that originally and weren’t altered at all.

I’m in Hertsmere council. It’s a small 1 bed house about 22sqm.

Should I try for permission? How much does it cost and will I need plans? If it’s rejected and I revise them will that cost extra?