You've got the land. You've got the in-laws, the college kid, or the rental idea. So can you actually put a second home on your Loomis property? Usually, yes. But the rules aren't the hard part.
By Meghan Mitchell, Realtor · DRE 01440500 | Ryan Mitchell, Mortgage Lender · Loan Factory · NMLS #2603666
"Can I build an ADU in Loomis?" is one of the questions I get asked the most. At showings. At soccer games. In the school pickup line.
And it makes sense. Loomis has big lots. Families here are doing multigenerational living. Grown kids can't afford to move out. Parents are moving closer. And a lot of people are wondering if a backyard cottage could help pay the mortgage.
So here's the honest rundown. What the rules say, what they don't tell you, and what it really takes on a rural Loomis lot.
First, What Counts as an ADU?
An ADU is an accessory dwelling unit. Think granny flat, casita, backyard cottage, or a converted garage. It has its own kitchen, bathroom, and entrance.
There's also the JADU, or junior ADU. That one is carved out of space inside your existing house, up to 500 square feet. It's a great fit for a parent or an adult kid who wants their own space without a whole separate build.
California law has made ADUs much easier to build over the last several years. Cities and towns, Loomis included, have to approve them if they meet the standards. It's not a popularity contest with the neighbors anymore.
The Basic Rules in Loomis
Here's the quick version for a single-family property. Rules change and every parcel is different, so always confirm yours with the Town of Loomis Planning Department before you spend a dime on plans.
How many. Generally one ADU plus one junior ADU on a single-family lot.
How big. Loomis code allows a detached ADU up to 1,200 square feet. An attached ADU is capped at 1,200 square feet or half the size of the main house, whichever is smaller. A JADU tops out at 500.
Setbacks and height. State law limits side and rear setbacks to 4 feet. A detached, single-story ADU can generally go 16 feet tall.
Fees. Keep it under 750 square feet and state law says no impact fees. School district fees only kick in over 500 square feet. Go bigger and fees scale with the size of your main home.
Living there. You don't have to live on the property to rent out an ADU. A junior ADU is different. The owner has to live in either the main house or the JADU.
Timeline. Once your application is complete, the Town has 60 days to approve or deny it.
The Shortcut Most People Don't Know About
Loomis has a pre-approved ADU program. You can pick from ready-made plans that already meet building code. That means no paying an architect to design from scratch, and no plan review fee for the pre-approved set.
The Town aims to approve or deny a complete pre-approved submittal within 30 days. That's fast.
Here's the catch. That expedited path is not available in Wildland Urban Interface areas, flood hazard zones, or geologic hazard zones. And plenty of rural Loomis sits in fire-prone areas. So check your parcel's fire zone first. It might change your whole timeline.
The Real Gatekeeper on a Loomis Lot: Your Septic
This is the part nobody puts on the brochure.
If your property is on septic, and a lot of Loomis acreage is, your system was sized for a certain number of bedrooms. Add a cottage with a bedroom and a bathroom, and you're adding load. Placer County Environmental Health will want to know your system can handle it.
Sometimes it can. Sometimes you need an expansion or a second system. That can mean perc testing, a designer, and real money. Same goes for a well. More people means more water, and you'll want to know your well's flow before you commit.
So the order matters. Septic and well first. Floor plans second.
Other things to check early
Power. Does your panel have room, or do you need an upgrade? Access. Can a fire truck reach the new unit? Fire hardening. New construction in fire zones comes with stricter material requirements. Insurance. Get a quote for the added structure before you build, not after.
I've watched buyers fall in love with a property because of "room for an ADU." Then the septic says otherwise. If an ADU is part of your plan, tell me up front. We'll dig into the septic records and well data during your inspection window, while you can still walk away.
Will an ADU Raise My Property Taxes?
A little, but not the way people fear. Your main home keeps its existing assessed value. Only the value of the new construction gets added to your tax bill. So you won't lose your Prop 13 base on the house you already own.
Can I Rent It Out or Sell It Separately?
Renting it long term? Yes. Plan on leases longer than 30 days, since state law lets towns block short-term rentals in ADUs. Check with the Town before you count on vacation rental income.
Selling it on its own? Generally no. In most cases, the ADU stays with the main property. It adds value to the whole parcel when you sell.
How Do People Pay for an ADU?
Most people don't write a check for the whole thing. The common routes:
HELOC. Tap your equity and draw as the build moves along. Great if you have a low first mortgage rate you want to keep.
Cash-out refinance. Makes more sense if today's rates are close to, or below, what you have now.
Renovation loan. Programs like FHA 203(k) or Fannie Mae HomeStyle can roll the build into one loan, sometimes based on the value after it's finished.
The right loan depends on your current rate, your equity, and how fast you want to build. And if you're buying a home that already has an ADU, some loan programs let you count part of that rental income toward qualifying. That can change what you can afford. Let's run the numbers before you pick a route.
The Bottom Line
Yes, you can probably build an ADU on your Loomis property. State law is on your side. The Town has a faster path with pre-approved plans.
But on a rural lot, the land decides. Septic, well, fire zone, and access come first. Get those answered and the rest is paperwork.
Buying a property for the ADU potential? Or wondering what one would add to your home's value before you sell? That's exactly the kind of thing we love to dig into.
Thinking About an ADU in Loomis?
Whether you're buying land with room to grow or adding a unit to the home you already love, we'll help you figure out what's possible and how to pay for it. Call, text, or email anytime.
This article is for general information only. ADU rules, fees, and septic requirements vary by parcel and change over time. Confirm details with the Town of Loomis and Placer County Environmental Health before you build. Not a commitment to lend.
