Roof Leaking? What to Do Right Now (Northern California Guide)

If your roof is leaking right now: keep people away from wet ceilings near lights and outlets, catch the water, relieve any bulging drywall over a bucket, photograph everything, and call a licensed roofer for an emergency tarp or temporary patch. Do not climb onto a wet roof. The permanent repair can wait for dry weather. Stopping the water can’t.

Northern California’s rainy season runs roughly October through April, and the first big storm of the year finds every weak spot that built up over a long, hot summer. This guide walks you through the first 30 minutes, how to figure out where the water is coming from, what repairs typically cost, and how to avoid the storm-chaser mistakes that make a bad day worse.

The first 30 minutes: 7 steps to limit the damage

1. Make it safe: water, electricity and ceilings

If water is dripping near a light fixture, ceiling fan, or outlet, switch off that circuit at the breaker panel before you do anything else. Keep kids and pets out of the room. A ceiling that is sagging, cracking, or bulging can let go without warning, so don’t stand directly under it.

2. Move what you can and protect the floor

Move electronics, furniture, and rugs out of the drip zone. Lay down plastic sheeting, a shower curtain, or old towels. Wood floors and carpet pads soak up water fast, and they are often the most expensive part of the interior damage.

3. Catch the water

Put a bucket or trash can under each drip. A towel in the bottom of the bucket stops the splash and keeps you from hearing it all night. Empty containers before they’re full. A few gallons of water gets heavy quickly.

4. Relieve a bulging ceiling (carefully)

If the drywall is ballooning downward, water is pooling on top of it. Put a bucket underneath, then use a screwdriver to poke a small hole at the lowest point of the bulge so the water drains in a controlled way. A small hole is a cheap patch. A collapsed ceiling means new drywall, insulation, and cleanup. Skip this step if the bulge is near a light fixture or the ceiling is already cracking.

5. Check the attic if you can do it safely

If you have safe attic access, bring a flashlight and look for wet decking, dripping nails, or soaked insulation. Water usually enters higher up the roof than where it shows on your ceiling, because it runs along rafters and sheathing before it drips. Mark the wettest spot you can find. If you set a container in the attic, rest it on a board across the joists, never on the drywall between them.

6. Document everything for insurance

Take photos and video of the ceiling, the drip, any wet belongings, and the attic before you clean up. Note the date and time. Keep receipts for tarps, fans, and emergency service. The California Department of Insurance tells policyholders to “make temporary repairs to prevent further damage”, and most policies expect you to take reasonable steps to protect the property. Documenting those steps helps your claim.

7. Get the roof covered by a professional, not a ladder in the rain

Wet shingles, tile, and moss are slick, and most roofing injuries are falls. A licensed roofer can install an emergency tarp or a temporary seal from a safe position. The permanent repair can be scheduled once the roof is dry and the source is confirmed.

Why is my roof leaking? The most common causes in Bay Area and Sacramento homes

Where the water shows up, and what kind of roof you have, usually narrows the cause down quickly:

Where you see water	Most likely cause	Where we see it most
Along a wall, chimney, or where a roof meets a second story	Failed step or counter flashing, or cracked stucco at the transition	Two-story homes and additions across the East Bay
Around a bathroom or kitchen vent	Cracked or sun-baked rubber pipe boot	Asphalt shingle roofs 10+ years old, especially in hot inland areas
Where two roof slopes meet	Debris-clogged or worn valley, or valley flashing that has rusted through	Homes under oaks and pines, such as Lafayette, Orinda and the Oakland hills
Under a tile roof where the tiles look fine	Failed underlayment beneath the tile. The tile sheds most water, the underlayment is what actually keeps it out	1970s–2000s concrete tile in San Ramon, Pleasanton and Dublin
Under a flat or low-slope section	Ponding water, open seams, or clogged drains and scuppers	Eichlers in Palo Alto, rear additions, and San Francisco row houses
Around a skylight	Failed skylight flashing or a cracked seal	Any roof with older curb-mounted skylights
Only in wind-driven rain	Lifted shingles or tile, gaps at the ridge, or flashing that is sound in calm rain but not sideways rain	Bay-exposed areas like Richmond, Pacifica and the North Bay

One more thing to rule out: a “leak” that appears on cold mornings rather than during rain is often condensation from poor attic ventilation, not a hole in the roof. The fix is different, so the diagnosis matters.

Leaks only in heavy rain? What that pattern tells you

A roof that stays dry in light rain but leaks in a downpour usually has one of three problems:

• Overflowing gutters or valleys. After a dry summer, the first storm washes leaves and needles into gutters and valleys. Water backs up under the roof edge and finds a path inside.
• Marginal flashing. Flashing that is slightly lifted or poorly lapped can shed normal rain and still let in water when volume or wind increases.
• Tired underlayment. On tile roofs especially, the underlayment can be brittle and torn even though it still handles light rain. Heavy rain overwhelms it.

If your roof leaks in the same spot every winter even though the shingles look fine, that recurring pattern points to a hidden flashing or underlayment failure. Our Concord roofing page covers the version of this we see most often in 1950s–70s tract homes.

Should you tarp the roof yourself?

Usually not. A tarp only works if it runs up and over the ridge so water can’t get under it, it’s anchored without new holes through the roof, and it’s installed on a dry, walkable surface. None of that is safe in the rain. Tile roofs add another problem: walking on them in the wrong spots cracks tiles, which creates new leaks. On a single-story roof, in dry conditions, a careful homeowner can sometimes place a tarp. On anything steeper, higher, tiled, or wet, call a professional.

What does a roof leak repair cost?

It depends on what failed and what kind of roof you have. As planning ranges for our service area:

• Minor repairs (a pipe boot, a flashing reseal, a few replaced shingles or tiles): roughly $300–$1,500.
• Major repairs (rotted decking, a rebuilt valley, underlayment replacement on a section of tile, storm damage across several slopes): roughly $2,500–$8,000.
• Emergency service (tarping or temporary protection during a storm) is priced separately, and emergency rates may apply.

You should get a written, itemized price before any permanent work begins. For a detailed breakdown by repair type and material, see our residential roof repair guide.

Will homeowners insurance cover a roof leak?

Sometimes. Policies generally cover sudden, accidental damage, such as a windstorm tearing off shingles or a tree limb punching through the roof, and the interior water damage that results. They generally don’t cover leaks caused by age, wear, or deferred maintenance. Many California carriers also limit payouts on older roofs. The details are in our guide: Does homeowners insurance cover roof replacement in California? If you’re thinking about a claim, photograph the damage first, then call your carrier. We can document what we find with photos and a written report.

After a big storm: how to avoid storm-chaser scams

Every major Bay Area storm brings door-knockers offering a “quick fix.” California law gives you real protection. Use it:

• Check the license before anyone goes on your roof. Look up the contractor on the CSLB license check. For a roof-only job, look for an active C-39 (Roofing) classification. Ours is #1158153.
• Know the “handyman” limit. Since January 1, 2025, unlicensed workers may take jobs only under $1,000 (labor and materials combined), and only if the job needs no permit and they have no employees (CSLB on AB 2622). Most real roof repairs exceed that.
• Cap the deposit. On a home improvement contract, a down payment generally can’t exceed $1,000 or 10% of the contract price, whichever is less (Bus. & Prof. Code §7159.5). Anyone demanding a large cash deposit up front is a red flag.
• Emergencies raise the stakes. Contracting without a license in an area under a declared state of emergency is a felony in California (Bus. & Prof. Code §7028.16).

Get ahead of the next storm

Most emergency leak calls we get could have been caught before the rain: a cracked pipe boot, a clogged valley, a lifted flashing edge. Before the season’s first big storm:

• Clear gutters, downspouts, and roof valleys of leaves and needles.
• Look at the roof from the ground with binoculars for missing, cracked, or slipped shingles and tiles.
• Check ceilings and attic sheathing for old stains, which mark where the roof has leaked before.
• Book a professional roof inspection, especially if your roof is over 15 years old or you’re not sure when it was last looked at.

Our roof inspections are free and include photos of anything that needs attention, so you can fix small problems on your schedule instead of the storm’s.

Roof leak FAQ

Can a roof leak be fixed while it’s raining?

A temporary fix can: an emergency tarp, a temporary seal, or diverting water away from the failure point. Permanent repairs such as replacing flashing, underlayment, or decking need a dry roof so materials bond and seal correctly. Expect a two-step process in the middle of a storm.

How do I find where my roof is leaking?

Start in the attic and follow the water trail uphill from the wet spot on the ceiling. Water often travels several feet along rafters or sheathing before it drips. Roofers confirm the source with controlled water testing and moisture readings, then check common failure points like flashing, pipe boots, valleys, and skylights.

Is a roof leak an emergency?

Treat it as one if water is near electrical fixtures, a ceiling is bulging or sagging, water is flowing rather than dripping, or more rain is forecast within a day or two. A slow drip into a bucket is still urgent, because hidden damage to insulation, drywall and framing grows every time it rains.

Will my roof leak damage be covered by insurance?

If a covered event caused it, such as wind, a falling tree, or other sudden damage, the resulting interior damage is often covered, minus your deductible. Leaks from age or wear usually aren’t. Document the damage, take reasonable steps to prevent more of it, and read your policy’s roof provisions before you file.

How long can I leave a roof leak before fixing it?

Not long. Even a small, steady leak can soak insulation, stain and weaken drywall, and start rotting roof decking and framing within a single rainy season. Once decking rots, a simple repair becomes a larger one. Get a temporary fix right away and a permanent repair as soon as the roof is dry.