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30-Year Fixed Jumbo Mortgage Refinance Interest Rates in Summerville, SC

Explore 30-year jumbo mortgage interest rates in Summerville, SC over time.

As of Mar 27, 2026
South Carolina Avg

6.712%6.71%

-0.03% · 1wk
National Avg

6.784%6.78%

0.00% · 1wk

Timeframe

30-jumbo Year Fixed Mortgage Interest Rates

Daily refinance averages provided by the Mortgage Research Center.


Compare mortgage rates in Summerville, South Carolina

Showing results for: 30-Year Fixed refinance offers for Single Family or Townhome properties in SC, total loan amount of $800,000.

LenderAPR / RateMonthly Payment
Mortgage Rate Company

Rate data provided by RateUpdate.com. Displayed by Mortgage Research Center, NMLS #1907, Equal Housing Opportunity. Rates and fees are estimates and subject to change without notice. Payments do not include taxes and insurance premiums. Actual payments may be higher. Not all lenders participate in this marketplace. Loan availability and terms may vary by state and lender. Lender offers, including badges like “Lowest APR” or “Lowest Payment,” are based only on results displayed here and may not reflect the absolute lowest offer available in the market. Rate and product details


Should I Refinance My Jumbo Mortgage in Summerville's Hot Market with 17.6% Appreciation?

With Summerville's strong 17.6% appreciation rate and median home values at $278,100, homeowners have likely built substantial equity. For jumbo mortgages (loans exceeding $806,500), refinancing when rates drop by 0.75-1% or more typically makes financial sense. On a $800,000 jumbo loan, refinancing from 7% to 6% saves $526/month ($6,312/year). With jumbo refinance closing costs around $20,000, you'd break even in 38 months. The rapid equity growth in Summerville also creates opportunities for jumbo cash-out refinancing to access built-up wealth.

How Much Can I Save Refinancing a Jumbo Loan in Summerville?

The savings on jumbo refinances are substantial due to large loan amounts. For a typical $800,000 jumbo loan in Summerville (80% LTV on $278,100 median homes), reducing your rate from 7% to 6% saves $526monthly. Over the 30-year life, that's $189k in total interest savings. Even after $20,000 closing costs (2.5% of loan amount), you're ahead after just 38 months. In Summerville's hot market with 17.6% annual appreciation, homeowners typically refinance when equity gains justify eliminating PMI or accessing cash for improvements.

What Are Jumbo Cash-Out Refinance Options in Summerville?

Summerville's 17.6% appreciation creates significant equity-access opportunities through jumbo cash-out refinancing. If your home appreciated to $278,100 and you tap 20% equity ($200,000), your new loan becomes $1,000,000 at approximately 6.5% (cash-out rates typically run 0.25-0.5% higher). Monthly payment: $6,321. Jumbo cash-out proceeds are commonly used for investment properties, major renovations, debt consolidation, or business ventures. With Summerville's property taxes at 0.57% ($132/month), factor PITI into affordability calculations when refinancing.

Do Jumbo Refinance Rates in Summerville Differ from Conforming Rates?

Yes. Jumbo loans in Summerville (any loan exceeding $806,500) typically carry rates 0.25-0.75% higher than conforming loans due to increased lender risk. However, borrowers with excellent credit (740+), low debt-to-income ratios (under 43%), and substantial reserves (6-12 months) can secure competitive jumbo rates. For Summerville's median home value of $278,100, an 80% LTV loan ($800,000) is near the jumbo threshold. Shop multiple lenders-portfolio lenders and credit unions sometimes offer better jumbo refinance rates than big banks. Rate differences compound over time: 0.5% higher on $800,000 costs ~$261/month extra.

What Are the Tax Implications of Jumbo Refinancing in Summerville?

Jumbo refinance interest remains tax-deductible up to the first $750,000 of mortgage debt ($375,000 if married filing separately). For Summerville homeowners with $800,000jumbo loans, interest on the excess amount isn't deductible. However, with Summerville's 0.57% property tax rate ($132/month on median homes), combined property tax and mortgage interest deductions can still significantly reduce taxable income. Cash-out refinance proceeds are generally not taxable as income. If using cash-out funds for home improvements, that interest may also be deductible. Consult a tax professional to optimize your Summerville jumbo refinance strategy, especially given the $278,100 median home values and high loan amounts involved.

Jumbo Loan Refinancing Strategy in Summerville

Let’s talk about that incredible 17.6% appreciation rate. Your Loan-to-Value (LTV) measures how much you owe versus what the home is worth.

If you bought your Summerville home with an FHA loan or a small down payment, you are likely paying Private Mortgage Insurance (PMI). Because your home's value has surged, your equity has naturally grown. By refinancing right now, you can get your home reappraised, drop your LTV below 80%, and eliminate that PMI payment entirely.

Property Tax Tip for Summerville Homeowners

Because property taxes are reasonable, a larger portion of your monthly payment goes toward principal and interest. Securing a lower interest rate through a refinance has a massive, immediate impact on your wallet.

State & Local Assistance in Summerville

SC Housing provides incredible statewide support. Be sure to explore their programs to ensure you are maximizing any available state-backed interest rate benefits in the Lowcountry.


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