A practical, LA-specific rain checklist: clean gutters, check roof flashing, seal doors and windows, slope water away from the foundation, and catch small leaks before the first atmospheric river arrives.
Rainy season home maintenance in Los Angeles comes down to four jobs. Clean your gutters, check the roof and flashing, seal doors and windows, and move water away from the foundation. Do that before the first storm, and you'll head off the leaks that cost homeowners the most.
Here's the LA catch. Our rain doesn't trickle in politely. About 75% of California's yearly precipitation falls between November and March, and atmospheric rivers deliver roughly half of it in a few intense bursts (CA OEHHA, 2025). In late December 2025, one storm dropped about 3.27 inches on Downtown LA in a few days, the fourth-wettest two-day holiday stretch since records began in 1877 (LAist, December 2025). A dry October fools people. The prep still matters.
Key Takeaways
- LA's wet season runs roughly November through March, with the heaviest rain packed into a few atmospheric-river storms, so prep before November.
- Clogged gutters and bad drainage cause most preventable rain damage. Clean gutters at least twice a year and slope soil away from the foundation.
- Water damage and freezing make up roughly a quarter of all home insurance claims, with an average payout in the five figures (Insurance Information Institute).
- Check the roof and flashing early. If you spot cracked flashing, missing shingles, or an active leak, call a roofer before the storms stack up.
Before You Start: Time It Right
The best time to prepare your home for rain is early fall, before the first real storm. LA's long dry season leaves gutters packed with leaves and roofs baking under months of sun. The first heavy rain finds every weak spot at once.
What you'll want on hand:
- A stable ladder and a helper to foot it.
- Gloves, a gutter scoop, and a hose.
- A flashlight for the attic, crawlspace, and under-sink cabinets.
- Exterior caulk and weatherstripping for gaps.
For the full year-round picture, our Los Angeles home maintenance checklist puts rain prep in context with the rest of your seasonal to-dos.
Step 1: Clean the Gutters and Downspouts
Clogged gutters are the number one preventable cause of rain damage, and they're the easiest to fix. When they clog, water overflows and runs down your walls and foundation. Over time that erodes soil, rots fascia boards, and pushes water toward the house. That's why This Old House recommends cleaning gutters at least twice a year, once in fall and once in spring (This Old House). On tree-heavy LA lots, do it more often.
- Scoop out leaves, dirt, and debris by hand or with a trowel.
- Flush the gutters with a hose and watch the flow.
- Check that each downspout drains freely and carries water well away from the house.
- Reattach any sagging sections so water runs toward the outlets.
Verify it worked: run the hose at the high end and watch it drain clean, with nothing pooling or spilling over. For the full method, tools, and safety tips, see our guide on how to clean gutters.
Step 2: Check the Roof and Flashing
The roof is your first line of defense, and most leaks don't start where you'd guess. They start at the flashing, the thin metal that seals the roof's transitions where it meets walls, chimneys, skylights, and vents. InterNACHI describes flashing as the sheet metal used in the spots "especially likely to leak" (InterNACHI). Those joints, not the open shingle field, are where water usually sneaks in.
From the ground with binoculars, or safely from a ladder, look for:
- Missing, cracked, or curling shingles.
- Rusted, bent, or lifting flashing around chimneys and vents.
- Cracked caulk where the roof meets walls or skylights.
- Debris packed in roof valleys.
When to call a roofer: steep or two-story roofs, active leaks, widespread damaged flashing, or anything you can't safely reach. Roof work is dangerous, and a storm-season leak gets expensive fast. If you'd rather not climb up at all, a good handyman in Los Angeles can handle the ground-level checks and point you to a roofer for the rest.
Step 3: Seal Doors and Windows
Gaps around doors and windows are a common, sneaky entry point during LA's sideways storms. Run your hand around the frames on a breezy day. If you feel a draft, rain can follow the same path. Fixes are cheap and fast:
- Replace cracked or flattened weatherstripping on doors and operable windows.
- Re-caulk the exterior seams where frames meet siding or stucco.
- Add or adjust door sweeps to close the gap at the threshold.
- Check that weep holes at the bottom of window frames are clear, not caulked shut.
Verify it worked: on the next windy evening, hold a lit incense stick near the frame. If the smoke stays steady, you've sealed the gap. Our walkthrough on how to weatherproof doors and windows covers each fix in detail.
Step 4: Send Water Away From the Foundation
Water that sits by the foundation is one of the most damaging things a storm can do. The soil around your home should slope away from the walls. Federal guidance calls for the ground to fall about half an inch per foot for the first 10 feet, roughly 6 inches of drop over 10 feet (Building America Solution Center, U.S. Dept. of Energy). If your yard slopes toward the house, water heads straight for the foundation.
- Add soil to low spots so the grade tilts away from the house.
- Make sure downspouts discharge onto splash blocks or extenders, not right at the base.
- Keep planter beds and mulch from mounding against the stucco.
This matters because standing water at the foundation is exactly the kind of slow, hidden damage that turns into a costly claim. Water damage and freezing account for roughly a quarter of all homeowners insurance claims, with an average payout in the five figures (Insurance Information Institute). Grading is cheap insurance against that.
Step 5: Clear Yard Drains and Area Drains
Many LA properties have area drains, channel drains, or catch basins that quietly clog all summer. Walk the yard and find every drain grate, driveway channel, and downspout outlet. Then:
- Pull leaves and sediment off each grate.
- Flush the line with a hose and confirm it flows.
- Clear any window wells and stairwell drains.
- Note any drain that backs up, so a pro can snake it before the rain.
A blocked yard drain sends water toward the house or garage. Clearing them now beats bailing later.
Step 6: Check the Sump Pump and Crawlspace
Not every LA home has a sump pump, but if yours does, test it before you need it. Pour a bucket of water into the pit and watch the pump kick on, move the water, and shut off. If it's sluggish or silent, get it serviced now. While you're down there, check the crawlspace or basement with a flashlight for damp spots, standing water, or musty smells. Those signal an existing leak. If you find water, mold, or a dead pump, bring in help before the season starts.
Step 7: Catch Leaks Early, Inside and Out
Early detection is the difference between a caulk-gun fix and a drywall repair. After the first light rain, do a quick walk-through:
- Check ceilings and upper walls for fresh stains or bubbling paint.
- Look under sinks and around windows for moisture.
- Peek in the attic with a flashlight during or right after rain.
- Watch where water pools outside once it's storming.
Catch a drip early and you often fix it for a few dollars. Wait, and one leak under a run of atmospheric rivers can soak insulation, framing, and drywall.
When to Handle It Yourself and When to Call a Pro
Most of this checklist is homeowner-friendly: gutters, weatherstripping, grading, clearing drains. It's a Saturday of work that saves you a winter of headaches. Call a pro for roof repairs you can't safely reach, active leaks, electrical near water, or a failing sump pump. NC Services is insured, not a licensed contractor, so we'll handle the small repairs and tell you plainly when a roofer or licensed specialist is the right call.
Frequently Asked Questions
When should I prepare my LA home for the rainy season?
Aim for September or October, before the first storm. LA's wet season runs roughly November through March, and the heaviest rain arrives in a handful of atmospheric-river storms. Prepping early means you're ready when the first one hits.
How often should I clean my gutters in Los Angeles?
At least twice a year, in fall and spring, per This Old House. With heavy tree cover, quarterly is safer. In LA, the fall cleaning matters most, since a summer's worth of dry debris will otherwise clog the gutters at the first rain.
What's the most common cause of rain damage to homes?
Poor drainage and clogged gutters top the list. When water can't flow away, it overflows onto walls and pools at the foundation. Water damage and freezing make up roughly a quarter of home insurance claims, and much of it is preventable.
Ready to Beat the First Storm?
Rainy season prep is simple, but the window is short. Knock out this checklist before November and you'll skip the leaks that cost the most.
NC Services is a fully insured local handyman serving Los Angeles, Santa Monica, Culver City, the South Bay, and the San Fernando Valley. We handle the ground-level rain prep, and we'll tell you plainly when a job needs a roofer or licensed pro. To get your home storm-ready, contact us or call (323) 989-4840.
About the author: NC Services is an insured handyman business based in Los Angeles, focused on small-to-mid home repairs done honestly and at a fair price. We're not a licensed general contractor, and we'll always tell you when your job needs one.
