How long does bathroom caulk last?

In a regularly-used shower or tub, 3–5 years before it starts cracking, peeling, or growing mildew beneath the surface. Re-caulking proactively prevents tile damage and subfloor moisture problems.

Why is my bathroom caulk moldy even though I clean it?

Once mold penetrates behind a caulk bead, surface cleaning won't eliminate it. The old caulk needs to be fully removed, the substrate cleaned with a mold-killing solution and dried, then fresh caulk applied — all three steps matter.

Can you caulk around exterior windows to reduce drafts?

Yes — exterior caulking around window frames and trim is one of the most cost-effective weatherization improvements. Paintable elastomeric caulk rated for exterior use is the standard choice.

Handyman Services Interior & Exterior Painting HVAC

Caulking & Weatherproofing in Martinez & Contra Costa County

Failing caulk and worn weatherstripping let in drafts, moisture, and pests — and silently inflate your energy bills. Bay Bilt connects homeowners with local professionals who remove old, cracked, or moldy caulk and apply a fresh bead, then reseal windows, doors, and bathroom fixtures to keep your home tight and comfortable year-round.

Find a Local Pro Call 925-257-2685

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What's Included

Window exterior caulk removal and replacement
Door and window interior caulk bead
Bathroom tub and shower re-caulking
Bathroom vanity and backsplash sealing
Door weatherstripping replacement (foam, V-strip, door sweeps)
Exterior gap sealing (foundation, HVAC penetrations)
Garage door bottom seal replacement

Typical Price Range

A bathroom tub or shower re-caulk typically runs $100–$175. A full window caulking pass (5–8 windows) usually runs $150–$275. Door weatherstripping replacement typically runs $75–$150 per door.

When You Need a Licensed Contractor Instead

Caulking is maintenance work and doesn't require a contractor's license. If moisture intrusion has caused structural rot behind window frames or in wall cavities, a licensed contractor should assess and repair the framing before the exterior gets re-caulked.

Related Repair Guides

Door, Lock & Weatherstripping Repairs Bathroom Handyman Repairs Exterior & Seasonal Home Maintenance Pre-Listing & Home Inspection Repairs

Caulking & Weatherproofing Near You

Martinez Pleasant Hill Concord Walnut Creek Lafayette Alamo Danville Benicia Clayton Pacheco Pittsburg Vallejo Antioch Pinole Hercules El Cerrito San Ramon

Frequently Asked Questions

: In a regularly-used shower or tub, 3–5 years before it starts cracking, peeling, or growing mildew beneath the surface. Re-caulking proactively prevents tile damage and subfloor moisture problems.
: Once mold penetrates behind a caulk bead, surface cleaning won't eliminate it. The old caulk needs to be fully removed, the substrate cleaned with a mold-killing solution and dried, then fresh caulk applied — all three steps matter.
: Yes — exterior caulking around window frames and trim is one of the most cost-effective weatherization improvements. Paintable elastomeric caulk rated for exterior use is the standard choice.

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Need Caulking & Weatherproofing in Contra Costa County?

Tell Bay Bilt about your project and it'll look for a relevant local pro. No cost to submit.

Tell us about the project Call 925-257-2685