What does cracked, failing exterior caulk cost?
Updated August 2026
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A cracked exterior caulk joint costs $6–12 to reseal and $1,000–6,000 to ignore once water works its way in behind the siding. Exterior caulk around windows, doors, and trim is a wear item, good for 5–10 years before it hardens, shrinks, and pulls away from the joint. When the seal opens, wind-driven rain and outside air slip behind the cladding, rotting the sheathing and framing you never see while the draft pads the energy bill on the side. Recaulking is a DIY weekend with a caulk gun; the damage from putting it off stays hidden until the wall goes soft.
The escalation ladder
Every row below is the same leak, left a little longer. The top is a cheap warning; the bottom is a claim.
| What happens | Typical bill | How fast |
|---|---|---|
| You scrape the old bead and recaulk the joints | $6–12 a tube, a weekend DIY | One weekend |
| A pro recaulks the exterior windows and trim | $300–800 for the service | One visit |
| Drafts from a failed seal raise the energy bills | $100–300+ a year in wasted heating and cooling | Every season |
| Water rots the trim and localized sheathing | $500–2,500 to replace and reseal | A couple of wet years |
| Hidden intrusion damages framing and finishes | $1,000–6,000 to open the wall and repair | Years unsealed |
Warning signs
Failing caulk is one of the easier problems to inspect by hand. Run your eye and a finger along the joints and look for cracked, shrunken, or crumbling beads, gaps you can slip a coin or a fingernail into, and caulk that has pulled cleanly away from the window or trim. Indoors, drafts you feel near the frame on a windy day, water stains on the wall below a window, and peeling paint or soft trim outside all say the seal has been leaking. Bugs and ladybugs finding their way in around a window frame are following the same gaps the water uses. Any daylight or draft at a joint is an open invitation you want to close before winter.
The prevention math
Prevention here is almost free: a $6–12 tube of exterior-grade sealant and an afternoon each fall to inspect the beads and touch up whatever has failed, set against a $1,000–6,000 wall repair. Scrape out the old, cracked caulk before laying a new bead, since fresh sealant will not stick to failing material. Do it in dry weather above 40 degrees so it cures properly. Set the reminder with how often to recaulk the exterior, brush up on the material in what caulk is, and follow the technique in how to recaulk exterior windows and doors. The same skill indoors is covered in how to recaulk a bathtub.
Every line in that table starts with a skipped 10-minute task. OnOtto keeps the 10-minute version on your calendar so the $2,000 version never happens.
Get the nudge before the billFrequently asked questions
Which caulk should I use around exterior windows?
For exterior window and trim joints, use a high-quality polyurethane, siliconized-acrylic, or a modern hybrid polymer sealant rated for exterior use, and paintable if you plan to paint over it, at $6–12 a tube. Pure silicone seals and lasts but will not take paint, which matters on trim. Avoid cheap general-purpose acrylic latex outdoors; it dries out and cracks within a few years. Match the color to the trim, and never caulk the bottom edge or weep holes of a window, which are designed to let trapped water escape.
Should the weep holes at the bottom of a window be caulked?
No, and this is a common mistake. The small slots or holes along the bottom of a window frame are weep holes, engineered to drain any water that gets into the frame back to the outside. Caulking them shut traps that water inside the frame, where it pools, rots the sill, and can leak indoors. Seal the sides and top of the frame and the trim joints, but leave the bottom weep holes and the very bottom of the frame open so water has a way out. Sealing everything is worse than sealing nothing here.
How much does failing caulk add to my energy bill?
Gaps around windows and doors are a meaningful share of a home's air leakage, and the U.S. Department of Energy identifies air sealing as one of the most cost-effective ways to cut heating and cooling costs. Failed caulk lets conditioned air escape and outdoor air pour in, which can add $100–300 or more a year to utility bills in a leaky house, on top of the comfort hit from drafts. A few dollars of caulk and some weatherstripping pay that back fast. The energy savings alone often justify the afternoon.