I tried seeding Bermuda on about 8k sf in my side yard. I wanted it to match the bermuda sod the builder put in front. I tried for two seasons, spent about $300 in seed, about $1500 in water, I had grass. It was more yellow than the sod, stringy, greened up 6 weeks later than the sod and went dormant 6 weeks sooner than the sod. Looked terrible unless I watered three times a week. I did some math, discovered that I spent nearly as much as good sod. Killed it and started bringing home pallets of sod to complete the yard. Customers ask me all the time, I just say "there isn't enough money."