Window & Door Caulking
Window and door caulking is the service that strips failed weather-seal bead at exterior window and door perimeters, casings, and thresholds — re-bedding outside joints in 20-year polyurethane or hybrid MS sealant and interior trim gaps in paintable siliconized acrylic, with ladder work up to 24 feet — starting at $180 per opening. The cracked white bead at the outside corner of a bedroom window, the gap between the door casing and the drywall that opened up after the first winter, the threshold under the front door where you can feel cold air with the back of your hand. The work fails twice as fast as bathroom caulking because the freeze-thaw cycle, UV exposure, and seasonal building movement all attack it. Handis strips the failed bead, picks the right product for the exposure, and ladders up to the second-story windows your last contractor skipped.
Service
What Does Window & Door Caulking Include?
Window and door caulking is the work for every joint where a window or door frame meets the wall, the siding, the floor, or the threshold — exterior window perimeters, exterior door casings and thresholds, interior window trim gaps, interior door casings, and threshold under-cuts — re-bedded in polyurethane outside and paintable siliconized acrylic inside. The product chemistry changes by exposure (polyurethane and hybrid MS sealants outside, siliconized acrylic inside), but the prep steps are the same — strip the failed bead, clean the substrate, dry, lay the new bead in one motion, tool dry.
Exterior Window Perimeter (Weather Seal)
The 1/4-inch joint where the window casing meets the siding — the most-exposed caulking on the house. Direct UV, freeze-thaw cycling, and seasonal expansion-contraction destroy standard latex caulk inside two winters. We use polyurethane (Sika 1A, Loctite PL Polyurethane) or a hybrid MS sealant (DAP Dynaflex Ultra) — both rated for ±25 to ±50 percent movement, 20-year UV exposure, and paintable within 24 hours. Stripped, prepped, laddered if second-story, run in a single motion, tooled dry.
Exterior Door Casing & Threshold
The vertical seams beside an exterior door and the horizontal joint between the threshold underside and the floor slab. Both leak air, both leak insects, and the threshold joint is where most rodents and yellow jackets get into a house. Polyurethane sealant for the casing; a different chemistry (an exterior-grade silicone or butyl tape) for the threshold underside where direct ground contact rules out paintable products.
Interior Window Trim Gaps
The gap between the interior window casing and the drywall — where the framer left a 1/8-inch reveal for movement and the painter was supposed to fill it before the topcoat. Settling, seasonal humidity changes, and shrinkage of old framing lumber all reopen this gap over years. Siliconized acrylic (DAP Alex Plus, Sherwin-Williams Painters Caulk) fills, flexes, takes paint in 30 to 60 minutes, and reads as part of the trim line after the topcoat.
Interior Door Casing & Baseboard Returns
The vertical line where the door casing meets the drywall, the corner where the baseboard returns into the door casing, the gap above the door header. All paint-ready siliconized acrylic, all dry tooled, all feathered into the trim line so the paint reads continuous across the joint.
Threshold Under-Cuts and Sweep Gaps
The gap under an exterior door where the threshold meets the floor and the gap where the sweep no longer touches the threshold. Caulking alone is not the right fix for a worn sweep — that is weatherstripping work — but the threshold-to-floor joint underneath gets sealed with the same chemistry as the casing, blocking the air path that bypasses any sweep above it.
How Window & Door Caulking Works
Six sequential steps from strip-and-prep on the failed bead to the color-matched paintable finish — the actual sequence we follow on every window and door caulking visit.
Strip the Failed Bead to Clean Substrate
Pull every cracked, lifted, or split bead off the window casing, door frame, threshold, or interior trim seam. A new bead over a cracked old bead is a four-month fix at best — the strip is what determines whether the next bead lasts six months or six years.
Pick the Right Product for the Exposure
Exterior gets polyurethane (Sika 1A or Loctite PL Polyurethane) or a hybrid MS sealant (DAP Dynaflex Ultra) — rated for 20-year UV and plus-or-minus 25 to 50 percent movement. Interior trim gets siliconized acrylic (DAP Alex Plus or Sherwin-Williams Painters Caulk). Latex on a window is a two-winter product and we do not carry it.
Ladder Up to Second-Story Windows
A 24-foot extension ladder with proper standoff brackets keeps the ladder rails off the wet fresh bead on the casing. Setup, fall protection, and slower bead-laying speed at height add 15 to 30 minutes per window. Windows above the second story get a per-visit quote after a photo review.
Run the Bead in a Single Motion
Cut the nozzle to match the gap (3/8 inch on stucco or brick, 1/4 inch on smooth wood or fiber cement), then lay a continuous bead in one motion across the casing-to-siding seam, around the door casing, along the threshold, or across the interior trim-to-drywall gap. No stop-and-start.
Dry-Tool the Bead Profile
Tool every bead dry with a plastic shaping tool, pulling once across the joint. The bead ends concave, fully adhered to both edges, no thin spots. A wet finger and dish soap leave a hairline crack down the centerline as the bead cures — we tool dry on every joint, every visit.
Color-Match Exterior or Paint Interior
Exterior polyurethane is available in white, almond, bronze, and brown stock — picked to match the trim paint. Unusual trim colors get a paintable polyurethane and a brushed coat of the trim paint after 15 to 30 minutes of skin time. Interior siliconized acrylic disappears into the trim line at the next paint coat.
Window & Door Caulking Pricing
Final pricing depends on opening count, ladder height for exterior work, and whether interior trim is being caulked pre-paint or post-paint. Request a free estimate for an accurate quote.
Tell us the window count, the story height, and whether it is exterior or trim — we will quote it.
Why Handis for Window & Door Caulking
Exterior window caulking is the trade where the wrong product looks fine for the first six months and fails on the second winter — and you do not see it fail until water shows up inside the wall or the bedroom drafts in January. Standard latex caulk has zero UV resistance and ±5 percent movement tolerance; the freeze-thaw cycle in Seattle alone moves a wood casing-to-siding joint ±15 percent every winter. Polyurethane handles ±25 to ±50 percent movement and 20 years of UV. The product is the difference. We do not carry the wrong tube to a window job.
Polyurethane outside, paintable acrylic inside, never latex on a window
Exterior gets polyurethane (Sika 1A, Loctite PL Polyurethane) or a hybrid MS sealant — both rated ±25 percent movement and 20-year UV. Interior trim gaps get siliconized acrylic (DAP Alex Plus or Sherwin-Williams Painters Caulk) — paint-ready in 30 to 60 minutes. Standard latex caulk is the product that fails every winter and we do not use it on a window or door.
Ladder work up to 24 feet, OSHA fall-protection
Second-story windows get a 24-ft extension ladder with proper standoff brackets so the ladder rails do not crush a clean fresh bead on the casing. Ladder work is a $40 surcharge over first-story pricing — covers setup, take-down, and the slower bead-laying speed at height.
Color-matched on exterior, paint-ready on interior
Exterior polyurethane is available in white, almond, bronze, and brown — picked to match the trim paint. If your trim color is not stock, we apply a paintable polyurethane and brush the topcoat on once it skins (15 to 30 minutes). Interior trim caulk reads identical to the wall and trim once painted because the next paint coat goes right over it.
Stripped, not painted over
A new bead over a cracked old bead is a four-month fix at best. Every visible failure gets stripped to clean substrate before the new bead. Stripping takes longer than the application; it is what determines whether the next bead lasts six months or six years.
30-day workmanship guarantee
If the bead cracks, separates from the casing or siding, or fails to take paint properly within 30 days because of our workmanship or prep, we come back and redo it at no extra charge.
Estimate
Number of windows and doors, story count, exterior or interior, and any visible failure (cracked, pulled away, missing) — we will quote it.
Customer Reviews
Window and door caulking reviews from real Handis customers.
1948 brick rambler, eleven exterior windows. The original caulk was cracked through and the bedrooms were drafty every winter. Tech laddered up to the higher windows (we have a tall front gable), stripped every bead, and ran fresh polyurethane on all of them. Half a day total. The next winter felt different.
Pre-paint interior caulking on a 1940s house where every window and door casing had a gap to the drywall. Tech went room by room, filled and tooled every seam. Painter showed up the next morning and said it was the cleanest prep he had seen on a job that was not his. Trim line came out flawless after the topcoat.
Front door — cold air coming under the threshold every winter despite a brand-new sweep. Tech sealed the threshold-to-slab joint underneath with an exterior butyl product and re-caulked the casing on both sides. Draft stopped. Should have done it years ago.
Six second-story windows at the back of the house. The original builder's caulk had failed and one window casing was visibly pulling away from the siding. Tech brought the right ladder and stand-off bracket so the ladder did not damage the wet bead. Half a day's work, all six clean fresh polyurethane in a color that matched the trim.
Whole-house interior trim caulking before we listed. Every door casing, every window trim gap, every baseboard return. The previous owner had clearly skipped this step in a 'flip' paint job and you could see every seam against the new paint. Two days of work, two coats of paint after, and the house showed photographs ready.
Frequently Asked Questions
Common questions about window and door caulking.