How to Avoid Damage From Rainy Season in Los Angeles (2025)
Los Angeles generally faces a shorter rainy season relatively to other states—but it still does cause outsized damage because most homes aren’t built for prolonged moisture. In fact, local insurance and restoration data consistently show that water intrusion, electrical moisture issues, and structural swelling spike 30–50% during winter storms, especially between December and February. The good news? Most rainy-season damage is extremely predictable and preventable if you act early.
Our end of the year guide will break down exactly how you as homeowners, renters, and small businesses can avoid costly repairs before the next storm hits. You should contact us on our phone number for any services you may need.
Why You Should Care…
Los Angeles typically sees 85–90% of its annual rainfall between November and March. Because our city experiences long dry periods, materials tend to expand, contract, and crack—creating entry points for when rain arrives. Unlike other colder states, most homes in LA often lack redundancy in drainage, sealing, and moisture protection, making even moderate storms a pretty big risk.
1. Keep Gutters & Downspouts Clear (Your First Line of Defense)
Why:
Clogged gutters are responsible for some of the most expensive but avoidable rain-related repairs in Southern California. Overflowing water damages fascia boards, siding, stucco, and foundations.
Quick steps
- Remove leaves and debris before and mid-season
- Ensure downspouts push water at least 3–5 feet away from the structure
- Check for sagging or disconnected sections
Typical cost (LA): $120–$250
Time to complete: 1–2 hours
2. Seal Doors & Windows Before They Swell Shut
Why:
Humidity causes wood frames and doors to swell, leading to leaks, drafts, and sticking doors—one of the top winter complaints we usually get.
Quick steps
- Inspect caulking and weatherstripping
- Reseal cracked or brittle caulk
- Adjust door alignment if rubbing has already started
Typical cost (LA): $150–$400
Time to complete: 2–3 hours
3. Inspect Roof Flashing & Penetrations (Not Just Shingles)
Why:
Roof leaks rarely ever come from missing shingles—they usually start at vents, chimneys, skylights, and flashing joints.
Quick steps
- Check flashing for rust or lifting
- Seal exposed nail heads
- Inspect areas around HVAC and vent penetrations
Typical cost (LA): $180–$600 (minor repairs)
Time to complete: 1–3 hours
4. Protect Electrical Systems From Moisture
Why:
Rain-driven humidity and leaks increase the risk of short circuits, tripped breakers, and corrosion, especially in older properties.
Quick steps:
- Ensure outdoor outlets are weather-rated and covered
- Check garage and exterior junction boxes
- Test GFCI outlets monthly during winter
Typical cost (LA): $150–$450
Time to complete: 1–2 hours
5. Manage Drainage Around Your Foundation
Why:
Poor drainage causes water to pool near foundations, leading to cracks, interior dampness, and long-term structural stress.
Quick steps
- Clear yard drains and surface grates
- Check soil grading slopes away from the home
- Extend short downspouts
Typical cost (LA): $200–$800
Time to complete: 2–4 hours.
6. Address Interior Humidity Early
Why:
High humidity leads to mold growth, peeling paint, warped cabinets, and musty odors—especially in bathrooms, kitchens, and garages.
Quick steps
- Test exhaust fans
- Seal small leaks immediately
- Improve airflow in enclosed areas
Typical cost (LA): $100–$350
Time to complete: 1–2 hours
7. Prepare Small Businesses for Slip & Safety Risks
Why:
Wet entryways and poor drainage increase liability risks for businesses during rainy season.
Quick steps
- Install or replace door sweeps
- Secure loose mats
- Improve lighting for darker winter days
Typical cost (LA): $150–$500
Time to complete: 1–3 hours
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We offer a wide range of plumbing solutions, including:
- Leak Repairs: Quick and effective solutions for dripping faucets, pipe leaks, and other water-related issues.
- Fixture Installations: Professional installation of faucets, sinks, toilets, showers, and bathtubs.
- Drain Cleaning: Removal of blockages and cleaning of drains to restore smooth water flow.
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FAQs: Rainy Season Damage in Los Angeles
Q: When should I start preparing for rainy season in LA?
Late October is ideal, but it’s never too late—repairs during the season still prevent worsening damage.
Q: Do renters need to worry about rainy-season damage?
Yes. While landlords handle structural issues, renters are often liable for interior damage caused by delayed reporting.
Q: Are small leaks really a big deal?
Absolutely. Small leaks cause hidden damage that becomes costly weeks later.
Prevention will always beat fixing…
You don’t just get sudden damage from rains—it’s usually the result of small ignored issues compounding over time. Spending a few hundred dollars on preventive fixes can save thousands in repairs, lost time, and stress in the long run.
And if you are one of those who still hasn’t prepared properly, this is your time, get in contact with us.
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