How Much Does Drywall Water Damage Repair Cost in San Mateo, CA? (2026)

Average Cost

$1,355–$2,533

Materials

$527–$1,143

Labor (Peninsula)

$557–$883

Labor rates in Peninsula are +28% compared to Sacramento Metro baseline.

Drywall water damage repair includes cutting out saturated or mold-contaminated drywall sections, inspecting the framing behind for moisture and mold, installing new drywall panels, taping and mudding seams, matching the existing texture (knockdown, orange peel, smooth), priming, and painting to blend with surrounding walls. This estimate uses Sacramento-area pricing for 2025-2026.

San Mateo is located in San Mateo County (Peninsula). Mid-Peninsula city with charming older neighborhoods, downtown shops, and newer high-rises. The local utility provider is PG&E.

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City

Sheets of drywall (4x8)

Materials Included

Drywall sheets (1/2" moisture-resistant)16 4x8 sheet

$224–$448

Joint compound, tape, corner bead4 lot

$80–$200

Texture spray / hopper (matching existing)1 lot

$15–$40

Primer & paint (color-matched)8 gallon

$200–$440

Drywall screws (1-1/4")1 box

$8–$15

Labor(Peninsula +28%)

Drywall installer / finisher6h @ $64–$102/hr

$384–$614

Painter3h @ $58–$90/hr

$173–$269

Contractor Markup25%

0%Avg 30%100%

Materials

$527–$1,143

Labor

$557–$883

Markup

$271–$507

Estimated Total Cost

$1,355 – $2,533

$339–$633 per unit

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Project Timeline

Demo & inspection

1-2 hours

Cut out water-damaged drywall sections, inspect framing for moisture and mold, and treat framing with antimicrobial if needed. Ensure the area is fully dry before proceeding.

Drywall installation

2-4 hours

Measure and cut new drywall panels, screw into framing, and install corner bead on outside corners.

Taping, mudding & texture

2-3 days (with drying time)

Apply tape and three coats of joint compound (with drying time between coats), sand smooth, and match the existing wall texture.

Priming & painting

3-6 hours

Apply stain-blocking primer, then color-matched paint. Feather paint into surrounding wall areas for a seamless blend.

Materials Breakdown

Material	Qty	Unit	Unit Cost	Total
Drywall sheets (1/2" moisture-resistant)	16	4x8 sheet	$14–$28	$224–$448
Joint compound, tape, corner bead	4	lot	$20–$50	$80–$200
Texture spray / hopper (matching existing)	1	lot	$15–$40	$15–$40
Primer & paint (color-matched)	8	gallon	$25–$55	$200–$440
Drywall screws (1-1/4")	1	box	$8–$15	$8–$15

Drywall Water Damage Repair in San Mateo — FAQ

How do I know if water-damaged drywall needs replacement?+

Drywall that is soft, crumbly, sagging, stained, or has visible mold must be replaced. If the paper facing is bubbling or delaminating, the sheet is compromised. Small water stains on solid drywall can sometimes be primed and painted over.

How long does drywall repair take?+

A small patch (1-2 sheets) takes 2-3 days including drying time between mud coats. Larger repairs (full wall or multiple rooms) may take 4-7 days. Texture matching adds 1 day.

Will the repaired area match the rest of my wall?+

A skilled finisher can match most textures (knockdown, orange peel, smooth) closely. Color matching is done with paint store spectrophotometers. Painting the entire wall provides the best color blend.