Top Hull & Bottom Cleaning Pros

Boat bottom cleaning typically costs between $150 and $1,500 depending on vessel size, growth severity, and whether the work is done in the water or during a haul-out. A routine light scrub on a 25-foot boat in the water may run $150–$300, while a larger vessel with heavy barnacle buildup will cost significantly more. Getting multiple quotes through a service like Boatwork.co helps ensure a fair price.

Most boat owners in warm, tropical, or high-fouling waters should schedule hull cleaning every 4–8 weeks. In cooler or lower-salinity environments, every 2–3 months may be sufficient. The frequency depends on your antifouling paint type, how often the vessel is used, and local water conditions. Regular cleaning prevents hard growth from bonding and makes each service faster and less expensive.

Yes — in-water scuba hull cleaning is one of the most common methods for maintaining boats kept in a slip or mooring. A certified dive technician scrubs the hull, running gear, props, and waterline while the boat remains in the water. This is a cost-effective option for routine maintenance, though a full haul-out may be recommended for heavy fouling or paint application.

Marine growth — including barnacles, zebra mussels, algae, and slime — attaches to submerged surfaces as larvae seek a hard substrate. Warm water, slow vessel movement, and aging or depleted antifouling paint all accelerate fouling. Boats that sit stationary in marina slips are especially vulnerable. Antifouling bottom paint is the primary defense, but even well-painted hulls require periodic cleaning.

When performed correctly, professional hull cleaning should not damage antifouling bottom paint. Skilled contractors use soft pads or brushes appropriate for the paint type — avoiding abrasive tools that can cut into ablative coatings. Over-aggressive scrubbing or using the wrong tools can prematurely wear the antifouling layer, so always hire a contractor experienced with your specific paint system.

Ablative (self-polishing) paints are designed to slowly wear away, releasing biocide as the hull moves through water. Hard antifouling paints form a stable coating that doesn't wear down. Ablative paints require gentler cleaning techniques to avoid stripping the active layer prematurely, while hard paints can tolerate more aggressive scrubbing. Your hull cleaning contractor should ask about your paint type before beginning work.

An in-water dive hull cleaning on a typical recreational boat (20–35 feet) generally takes 1–4 hours. Larger vessels or those with significant growth buildup can take longer. A full haul-out cleaning that includes running gear, through-hulls, and prep for antifouling paint application may take a full day or more. Your contractor can provide a time estimate after a visual assessment.

Yes — a thorough hull cleaning service should include the propeller, shaft, trim tabs, rudder, and through-hulls, not just the hull bottom. Marine growth on props and running gear causes vibration, reduced thrust, and accelerated corrosion. Many contractors also inspect zinc anodes during the cleaning and can flag ones that need replacement before they fail.

DIY hull cleaning is possible for light surface algae and slime using a long-handled hull brush at the dock. However, for barnacles, hard growth, or any work requiring in-water diving, hiring a certified professional is strongly recommended for safety and effectiveness. Professionals also have the tools to clean without damaging antifouling coatings and can identify developing issues like blistering or osmosis.

The best way to find a vetted hull cleaning contractor is to use a marine services marketplace like Boatwork.co, where you can browse local professionals, read verified customer reviews, and request quotes. You can also ask your marina for recommendations or check with local dive shops that offer hull cleaning services. Always confirm the contractor has experience with your vessel type and hull coating.