After a brief return to lower, pre-2009 levels, FHA loan limits have been restored. As signed into law last Friday, maximum FHA loan limits are — once again — as high as $729,750.

The move creates additional mortgage financing possibilities in more than 650 U.S. counties, and promises to increase the FHA’s mortgage market share, which has grown from 6% in 2007 to roughly 30% today.

The change in FHA loan limits also marks the first time that FHA loan limits exceed those of conventional mortgage-backers Fannie Mae and Freddie Mac.

Conventional loans remain capped at a maximum of $625,500.

For home buyers in San Francisco and nationwide, FHA-insured mortgage offer several advantages over comparable conventional loans, the most commonly cited of which is that FHA-insured loans require a down payment of just 3.5 percent.

FHA-insured mortgages carry other advantages, too, however.

First, FHA home loans are not subject to loan-level pricing adjustments (LLPA). This means that, all things equal, buyers and would-be refinancers with credit scores below 740; or, who live in multi-unit homes; or, who have high loan-to-values are not subject to additional loan fees as a conventional mortgage applicant might.

Second, after 6 months of on-time payments, FHA-backed homeowners are eligible for the FHA Streamline Refinance. The FHA Streamline Refinance is among the simplest loan products for which to qualify with no appraisal required. Even if you’re “underwater” on your mortgage, you can still be streamline-eligible.

And, lastly, at least in today’s market, FHA mortgage rates are below those of the conventional market.

The downside of FHA financing, however, is that all FHA mortgages require mortgage insurance and FHA mortgage rates are often higher versus a comparable conventional loan. This means that, although its mortgage rate may be lower, the payment for an FHA home loan may be higher as compared to a Fannie Mae mortgage with similar credit traits.

FHA loans aren’t always optimal, but with higher FHA loan limits, expect the FHA’s market share to increase.

Check your local FHA loan limit at the HUD website.

FHA home loans are federal assistance mortgages made by lenders, and backed by the government. The FHA doesn’t make loans to California homeowners — it insures loans made to homeowners by federally-qualified lenders.

By all accounts, FHA home loans are surging in popularity.

• 2006, FHA insured 3.3% of all mortgages made
• Q2 2009, FHA insured 19.2% of all mortgages made

A major reason for the increase can be tied to guidelines.

As compared to its conforming mortgage cousins Fannie Mae and Freddie Mac, FHA home loans have lower downpayment requirements and looser credit standards. The FHA allows downpayments of 3.5 percent for homes in Santa Rosa and Fannie Mae and Freddie Mac do not, as an example.

Another reason is that FHA home loans aren’t subject to credit score fees the way that conforming mortgages are. Through Fannie or Freddie, a home buyer with a 650 FICO and 20% down is subject to 3% in risk fees.  Via the FHA, the fee is zero, making FHA the better “deal”.

The FHA published its 2010 loan limits. There’s no change from 2009.

The base 2010 FHA loan limits are:

• 1-unit : $271,050
• 2-unit : $347,000
• 3-unit : $419,400
• 4-unit : $521,250

We say “base” because these loan limits don’t apply to all areas equally.  Higher-cost regions get higher loan limits, based on typical home values. Homes in Los Angeles County, for example, can be FHA-insured up to $729,750 in 2010, and there are special exceptions made for Alaska and Hawaii.

The official FHA announcement included a complete, county-by-county FHA loan limit list. The first spreadsheet shows each county at or above the $729,750 maximum; the second list is everyone else.

If your home’s county is on neither list, use the “base” numbers above.