Professional Liability Insurance

I was wondering if anyone could approximate cost of professional liability insurance for construction of an MOU with the United States that has its own business without employees and bills about $ 300,000 per year. The work is mainly design work and consultation.

If you could find someone to assure you, it depends on your experience, what type of projects you design (no condos) if you have any previous disputes, the franchise that you can show that you could pay and what is the amount you wish to provide.

Recently, I looked and it was almost 15K/year for 1 plant cover W 50K deductible

reality check ...

300K/year for sole proprietor?