One-Story Bathroom Addition

I need help adding a traditional-style bathroom to my home using existing building plans. The addition will be one-story and should include a shower as a key fixture.

Requirements:
- Experience with home additions, especially one-story.
- Ability to work with and adapt existing building plans.
- Design and build a bathroom in traditional style.
- Ensure compliance with local building codes and regulations.

Ideal skills include:
- Architectural design
- Construction management
- Interior design (traditional style)

Please provide examples of similar work and estimated timelines.