What's My Principle Elevation

[NoNameNoNumber]

The address is * The Crescent but the gravel driveway and front door face Boundary Rd. I want to replace the two existing garages highlighted in red with a single structure which complies with the criteria for permitted development- But that's working on the principle elevation being the easterly side that faces The Crescent...

What are your thoughts?

 

[NoNameNoNumber]

The neighbours on Boundary rd are spot on, we've even discussed them building a lean to against my garage so he has a birdpoo free zone to detail his cars
The adjoining neighbours' access is from Beech Ave off The Crescent.

Surely the fact that I'm replacing 30m^2 of dilapidated garages with a single 30m^2 garage would put any planning application in good steed?

 

[NoNameNoNumber]

Does that mean the rules could be bent slightly? Ie if it looks like a retro would be granted regardless do I need to go with a flat roof to ensure I'm below the 2.5m eaves height or could I do a pitched roof on the boundary and keep the 2.5m eaves but with likely a 3.5m ridge?