Custom Quoting Tool for Renovation Business

I'm a residential bathroom and kitchen renovation business owner in Australia. I want a quoting tool built from scratch, not an upgrade of anything existing. I need a clean, professional client facing quote template that exports to PDF, backed by a costing system where I can enter trade costs and materials, set my margin, and have it calculate the final client price automatically. I'm not tech savvy, so it needs to be simple for me to use day to day, ideally a straightforward form or dashboard rather than anything requiring code knowledge to update. Key features wanted: saved price list for common items and materials, adjustable margin or markup control, professional branded PDF output, and an easy way to save and revisit past quotes. Experience building tools for tradies, contractors, or small service businesses is highly valued, as is experience with quoting or estimating software.