HiddenHomeCost
Know before you buy
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Hidden-cost guides
Know the hidden costs — county by county
The price tag is only part of what a home costs. Property tax, Mello-Roos, insurance, and utilities are all set locally — so two homes at the same price can cost very different amounts to own, from one county to the next and even one street to the next. These guides break down what actually drives those costs where you’re buying, so nothing on your bill is a surprise after you close.
Placer County
Roseville · Rocklin · Lincoln · Auburn · Colfax & more
Mello-Roos in the newer West Roseville tracts, Roseville Electric vs PG&E (a real ~2× power-bill difference), and where fire risk climbs from the valley floor to the foothills.
Sacramento County
Sacramento · Folsom · Elk Grove · Citrus Heights · Carmichael
SMUD power at roughly half a PG&E bill, North Natomas Mello-Roos, low wildfire hazard, and the supplemental bill that catches new buyers a year after closing.
Orange County
Irvine · Newport Beach · Santa Ana · Yorba Linda & more
Irvine’s heavy Great Park Mello-Roos (the highest in the county), coastal fire-zone insurance and FAIR Plan realities, and SCE electric rates.
Butte County
Chico · Paradise · Oroville
The county that breaks the pattern: Mello-Roos is rare and the tax rate is low, but wildfire insurance decides deals — and Oroville adds a separate FEMA flood exposure most buyers never price in.
What every guide covers
The six costs Zillow leaves out
Property tax
The real effective rate by area — 1% Prop 13 base plus voter bonds.
The supplemental bill
The one-time reassessment bill, with worked examples and proration.
Mello-Roos / CFD
Which neighborhoods carry it, typical ranges, and how to look up a parcel.
Fire zones + FAIR Plan
CAL FIRE hazard zones and what triggers last-resort insurance.
Insurance ranges
Typical annual premiums by ZIP, with the high-hazard outliers flagged.
Utility territory
PG&E vs SMUD vs Roseville Electric vs SCE — same power, very different bills.
Common questions
Hidden-cost FAQ
The biggest "hidden" costs — property tax rates, Mello-Roos and special assessments, wildfire-driven insurance, and which utility serves the home — are all set locally, not statewide. So two similar homes at the same purchase price can carry very different monthly costs once those local factors are added in, even within the same metro.
When you buy, the county reassesses the property to your purchase price. The supplemental bill is a one-time charge for the difference between the seller’s old assessed value and your new one, prorated over the rest of the tax year. It usually shows up several months to a year after closing and surprises a lot of buyers because it arrives separately from the regular annual tax bill.
Mello-Roos — formally a Community Facilities District (CFD) — is a special tax that funds infrastructure like schools, roads, and parks in newer developments, charged on top of your base 1% property tax. It is most common in master-planned communities built since the 1980s and can add anywhere from a few hundred to a few thousand dollars a year, so it is worth checking the specific parcel before you make an offer.
Parts of Newport Beach — especially around the harbor, the Balboa peninsula, and communities like Lido Peninsula and Beacon Bay — sit on leased land, so you buy the home but pay ongoing "ground rent" for the land underneath it. Much of that waterfront is public tidelands (overseen by the City of Newport Beach and the California State Lands Commission) or land historically leased rather than sold. It matters because the ground rent is on top of your mortgage — sometimes hundreds to a few thousand dollars a month — and lenders look hard at how many years are left on the lease, which can affect both financing and resale.
Have a specific address in mind?
The guides tell you what to look for; the home page tells you the number. Run any Placer, Sacramento, Butte, or Orange County address through the live tool for its real tax-rate area, Mello-Roos, fire-zone status, and utility territory.