House Extension Plans for Permission

I need detailed architectural plans for a small house extension to submit for planning permission. The extension will be less than 20 sqm and will include:

- Two-storey section
- Single-storey section with flat roof
- Ensuite upstairs
- Utility room downstairs

Ideal skills and experience:
- Knowledge of local planning regulations
- Experience with residential extension designs
- Proficiency in architectural design software
- Strong attention to detail

Please provide examples of similar work.