Guides
By Sounding Research Updated
Straight answers to the San Diego property questions that come up most, from Mello-Roos to surprise tax bills, financing, and the tax-base rules for owners moving up. Every figure is sourced and dated; none of it is legal or financial advice.
These guides exist because the numbers that decide whether a San Diego house is affordable are almost never the numbers on the listing. A listing shows a price and, if you are lucky, an HOA due. It does not show the community facilities district that adds a few hundred dollars a month in Otay Ranch but nothing in Coronado, the supplemental bill that lands six months after you close and catches most first-time buyers off guard, or the fire-hazard designation that decides whether your insurance quote is ordinary or eye-watering. Each guide takes one of those and works it through end to end, with the arithmetic shown rather than asserted.
Where to start
If you are buying your first home here, read how San Diego property taxes actually work and then the supplemental tax bill; together they explain most of the gap between the payment a lender quotes you and the payment you will actually make. If you are shopping newer construction inland, start with what Mello-Roos is. If you are using a VA or FHA entitlement, the financing guides compare the true lifetime cost of each program rather than just the rate. And if you already own here and are trading up, Prop 19 is the one rule that can change your annual cost by five figures.
How this fits with the place guides
The guides below explain a mechanism once, in general. The city and neighborhood guides apply those mechanisms to a specific market: which districts levy a CFD, what the effective tax rate actually comes to, where the flood and fire lines fall. Guides answer “how does this work?”; place guides answer “what does this cost here?” Most people end up reading one of each.
What Is Mello-Roos?
What Mello-Roos actually is under state law, why Prop 13 created it, typical costs by San Diego community, how long it lasts, deductibility, and how to check any specific address.
The Supplemental Tax Bill Surprise
Why California buyers get a surprise property tax bill months after closing, the proration-factor table behind it, worked one-bill and two-bill examples, and how to budget for it.
VA Loans in San Diego: True Cost vs. FHA
VA funding fee tiers, FHA mortgage insurance, and a real San Diego price comparison, showing the true monthly cost difference for military buyers.
Prop 19 for Move-Up Buyers
How Prop 19 lets eligible California homeowners carry their low property tax base to a new home: mechanics, a worked example, and the sell-or-rent decision it enables.
How Much Income Do You Need to Buy a $1M Home in San Diego?
The real income needed for a $1M San Diego home, by loan program and DTI ratio, including the Mello-Roos and HOA costs most calculators skip.
Mello-Roos by Community: Where San Diego's Special Taxes Actually Land
Which San Diego communities carry Mello-Roos CFDs, which carry none, and how to find the exact special tax on your parcel. From the county Auditor's list.
Rent vs. Buy in San Diego: Running the Actual Breakeven
San Diego rent vs buy, modeled: the exact breakeven year by appreciation scenario, Prop 13 math, and the real tax deduction benefit.
Wildfire Insurance in San Diego: What a High Fire Hazard Zone Costs You
A Very High Fire Hazard Severity Zone can multiply your San Diego insurance bill or block your loan. Zones, FAIR Plan costs, and closing risk, explained.
San Marcos: What Buyers Should Verify Before an Offer
San Marcos buyer's guide: San Elijo Hills Mello-Roos, VHFHSZ fire zones, San Marcos Creek flood risk, and VA/FHA/conventional math, sourced and dated.
San Diego Property Taxes Explained
How San Diego County property tax actually works: the 1% Prop 13 base, tax rate areas, Mello-Roos, the supplemental bill, the homeowners' exemption, and the payment calendar, sourced and dated.
Closing Costs in San Diego: What You'll Actually Pay
San Diego closing-cost guide: every itemized line (lender, title, escrow, recording, transfer tax, prepaids), VA/FHA/conventional differences, and a worked $850K example.
FHA Loans in San Diego: Limits, MIP, and When They Beat VA and Conventional
San Diego FHA loan guide for 2026: the $1,104,000 loan limit, upfront and annual MIP (including the life-of-loan trap), a worked FHA vs. VA vs. conventional comparison, and 203(k), condo, and co-borrower rules.
First-Time Homebuyer Programs in San Diego
How San Diego's first-time buyer programs actually work: CalHFA, Dream For All, MCC, SDHC, and County assistance, sourced and dated, with what to verify before you count on any of them.
ADUs in San Diego: Rules, Costs, and the Rental Math
ADUs in San Diego, sourced: the state ministerial-approval law, the City's ADU Bonus Program, County unincorporated rules, the Prop 13 new-construction tax mechanic, and the rental math.
Flood Zones and Flood Insurance in San Diego: When You Need It and What It Costs
San Diego flood zones explained: FEMA SFHA designations, when a lender requires flood insurance, NFIP vs. private coverage, Risk Rating 2.0, and where flood risk concentrates countywide.
Looking for a specific market? See the city-by-city guides for Chula Vista, Coronado, and more, or the San Diego neighborhood guides for North Park, La Jolla, and beyond.
See these numbers for your own address
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