Concrete tile over hang

[AdaminCymru]

I’m having a dormer loft extension at the moment and the existing roof structure includes a 400mm overhang with laddered rafters plus another 100mm tile overhang beyond this to the verge. The approved planning drawings indicate that the dormer cheek will sit 750mm from the verge, so taking into account the laddered rafter plus 100mm tile overhang, the dormer cheek was set to be 250mm in from the outside of the outer gable skin. 
 

The trimmers for the cheek have been formed, but my builder says that the 100mm tile overhang must be reduced to about 30-40mm once the roof is re-tiled, as we are having a continuous dry verge.

 

Would this be an issue with planning? The cheek is still where it is meant to be, but the distance to the verge is reduced. 
 

I’ve asked if the 100mm overhang could be maintained and he says it can’t - any thoughts on whether this can be maintained once the roof is retiled? 
 

Thank you 

[AdaminCymru]

Correction, a 300mm ladder overhangs the gable, plus 100mm tile over hanging the end of the ladder. Dormer is therefore set in 350mm from the outside of the external skin on the gable wall 

[bassanclan]

Planning won't worry about 100mm here or there, unless you are really close to neighbours or in a conservation area (which I doubt if you are using concrete tiles)

[AdaminCymru]

7 hours ago, bassanclan said:

Planning won't worry about 100mm here or there, unless you are really close to neighbours or in a conservation area (which I doubt if you are using concrete tiles)

Thank you for the response. Not in a conservation area and the house is detached