Traditional Semi-Detached Extension Plans

I’m ready to commission detailed architectural drawings for a two-part, brick-built extension that keeps the traditional character of my UK semi. On the side, I need a full two-storey build that projects 2.7 m while still preserving a 0.8 m external walkway... (Budget: £2 - £20 GBP, Jobs: 3D Modelling, 3D Rendering, Architectural Engineering, AutoCAD, Building Architecture, Building Design, Building Information Modeling, Interior Design)