The new rules — which are temporary and take effect this summer — come after more than a year of stringent standards from lenders. Among them:

•Better Credit Score — New borrowers will have to have a minimum credit score of 580 to qualify for a 3.5 percent down payment. Previously, there was no minimum score. Those with lower scores will have to make at least a 10 percent down payment. The average credit score of FHA-insured borrowers is 693.

•Higher Insurance Premiums — Buyers who get an FHA-insured loan will soon have to pay a higher initial insurance premium. The new premium will be 2.25 percent of the value of total loan amount, up from 1.75 percent now. A $100,000 mortgage would require a payment of $2,250, or $500 more. But buyers can roll the added cost into the loan amount.

•Reduction in Seller Concessions — Starting this summer, sellers will not be able to offer as much help to buyers to pay their closing costs. The maximum amount of assistance will drop to 3 percent of the value of the property, from the current 6 percent.