“How much does a boathouse cost?” is one of the most common questions homeowners ask when exploring waterfront upgrades. The answer depends on several key factors, design, materials, roof type, boat lift, and the specific conditions of your property. While prices vary, most residential boathouses range from $25,000 to $70,000 or more, depending on size, layout, and selected features.
Average Boathouse Cost
The average cost of a boathouse is between $25,000 and $70,000 for one or two boat slips, with high-end custom designs exceeding $100,000. Smaller single-slip builds with standard materials start around $25,000, while dual-slip structures with premium decking, lifts, and roofing typically fall in the $60,000–$70,000 range.
Understanding what contributes to these costs can help you make smart design decisions, stay within budget, and ensure your investment enhances both your property value and your waterfront lifestyle.
What Is a Boathouse?
A boathouse is a structure built to store and protect boats, often located directly on the water for easy access. Depending on design, a boathouse may include boat slips, decking, boat lifts, and even covered areas for lounging or storage. Some luxury boathouses also incorporate enclosed spaces for entertaining, fishing, or maintenance.
Boathouses come in many shapes and sizes, from simple shelters designed for utility to beautifully finished, multi-use spaces that complement the home’s architecture. The cost ultimately depends on how functional or elaborate you want your boathouse to be.
Key Factors That Influence the Cost of a Boathouse
Because no two waterfronts are exactly alike, every boathouse is unique. Below are the primary components and design considerations that determine the final boathouse construction cost.
1. Boat Access and Location
The first design question is how you’ll access your boat from your property. The layout of your shoreline, including its slope, water depth, and dock access, will determine where the boathouse should be positioned and how much decking or support structure is needed.
Position to Shore
Positioning your boathouse parallel to the shore provides easy access directly from land onto the boat. This setup is convenient but requires sufficient water depth along the bulkhead. If the water is too shallow, the boat may not float freely, especially during low tide. Ensuring proper depth might require building the boathouse farther from shore, which increases the structure’s footprint — and its cost.
Deck Access
When deeper water lies farther from the shoreline, additional decking between the shore and the boathouse is needed. A small connecting deck can add both function and safety but also increases the total square footage and materials required.
If the boathouse is built perpendicular to shore, you’ll need decking on one or both sides of the boat slip to allow safe access. The type of decking material and total surface area both play major roles in determining the overall cost.
Deck Size
For many waterfront homeowners, the deck is more than a walkway, it’s an outdoor living space. Some prefer minimal deck space for fishing or cleaning boats, while others envision a large, covered area for gatherings, barbecues, or simply relaxing by the water.
A covered deck enhances both comfort and aesthetics, but it increases costs due to the added roofing and framing materials. When planning, balance your recreational needs with your budget and desired maintenance level.
2. Decking Material
Decking materials vary widely in both cost and lifespan, and your choice will have a big impact on the total cost of a boathouse.
- Treated Wood (2×6 boards):
The most affordable option, priced around $16–$20 per square foot depending on total deck size and layout. Treated wood decking exposed to sunlight typically lasts 7–10 years but can last longer when covered or shaded. - Composite Decking (such as PVC or capped polymer boards):
Requires less maintenance and lasts 15–25 years, particularly when installed under a roof. However, it’s more expensive, averaging $28–$32 per square foot. Composite materials also need additional support joists due to their flexibility, which adds to labor costs.
While composite decking has a higher upfront cost, it’s an excellent long-term investment for homeowners who want a low-maintenance, polished look that endures.
3. Roof Type and Material
The roof is one of the most expensive and defining components of a boathouse. Roof style, pitch, and material selection not only affect the overall cost but also determine how well the structure stands up to wind and weather conditions.
Hip Roof
A hip roof has four sloping sides that meet at a ridge, similar to most home roofs. This design offers strong wind resistance and a balanced appearance that complements nearby homes. Costs typically range from $12–$18 per square foot, depending on roof complexity and decking materials. Metal or shingled finishes can be applied based on aesthetic preference.
Gable Roof
A gable roof features two sloped sides that meet at a central peak, creating a triangular shape on each end. It’s a classic design but slightly less wind-resistant than a hip roof. Gable roofs can be open or enclosed with siding, though enclosed ends add cost and strength. Typical pricing ranges from $18–$28 per square foot, depending on materials and whether the structure is fully enclosed.
Gable roofs are popular in areas protected from high winds but are not recommended for fully exposed coastal environments.
Flat Roof
A flat roof, made from metal R-panel, has a minimal slope to allow water drainage. This is the most economical roof type, generally costing $9–$11 per square foot. It’s easy to install and repair but offers lower wind ratings, making it best suited for calm, inland areas such as lakes or sheltered canals. Many homeowners’ associations restrict flat roofs, so always verify local regulations before selecting this option.
Tongue and Groove Roof
A tongue and groove roof system adds strength and visual appeal, using 2×6 decking boards that interlock for a seamless, sturdy surface. This system exceeds most building codes for wind resistance — often rated above 140 mph — and provides a beautiful finish ideal for entertaining areas. The cost varies based on material and size but typically falls on the higher end of the roof spectrum due to added labor and materials. Homeowners who enjoy spending time outdoors often choose this option for its durability and elegant appearance.
4. Boat Lift
A boat lift is an essential part of most modern boathouses. It keeps your vessel dry, clean, and safe from corrosion or wave damage.
The cost of a boat lift depends on its capacity, configuration, and operation type (manual, electric, or hydraulic).
For a typical 6,000-pound lift — sufficient for most center-console bay boats under 30 feet — expect to pay between $6,000 and $16,000. Larger or more advanced systems can exceed that range, especially when designed for heavier boats or with premium control options.
Working with an experienced marine construction company ensures the lift is properly sized and installed for your specific boat and site conditions.
5. Pilings and Foundation
Pilings form the structural foundation of a boathouse. They support the weight of the roof, deck, and boat lift, making them one of the most critical (and variable) cost factors. The type of water, depth, and soil composition all affect pile selection and pricing.
Water Type
- Saltwater: Requires 2.5 CCA-treated piles, highly resistant to marine borers and rot.
- Freshwater: Can use 0.80 CCA-treated piles, since decay is slower in these environments.
- Brackish water: Should use the higher 2.5 CCA treatment for added protection against marine organisms.
Water Depth
- 3–5 feet deep, hard clay bottom: Use 30-foot piles.
- 6–10 feet deep or sandy/silty bottom: 40-foot piles recommended.
- 15+ feet deep or very soft bottom: 50-foot piles or longer, special order required.
Pile cost depends on both length and treatment level:
- 0.80 CCA piles: about $13 per foot
- 2.5 CCA piles: about $16 per foot (for up to 40 feet)
For projects requiring piles longer than 40 feet, custom ordering and supplier confirmation are needed. The total number of piles also varies with boathouse size and configuration, influencing the overall budget significantly.
6. Additional Customization Options
Beyond structural elements, customization allows you to tailor your boathouse for both function and lifestyle. Optional features may include:
- Covered seating or entertainment areas
- Lighting and electrical systems
- Storage or fish-cleaning stations
- Custom railings or decorative trim
Each addition increases both cost and enjoyment, transforming a simple storage space into a multipurpose waterfront retreat.
How Much Does a Boathouse Cost Overall?
Now that we’ve covered all the key cost factors — from roofing to decking, pilings, and lifts — let’s look at total cost expectations.
- Single boat slip boathouse (hip roof, standard lift, minimal decking): $25,000 – $30,000
- Double boat slip with expanded deck and upgraded lift: $60,000 – $70,000
- Custom multi-slip or luxury design with premium materials: $80,000+
These ranges reflect averages for planning purposes. Final costs depend on the property layout, design complexity, material selections, and site accessibility.
Because most boathouses are custom-built, it’s always best to consult a professional marine construction company that can provide a site-specific quote.
Why Quality Matters in Boathouse Construction
A well-built boathouse isn’t just about aesthetics, it’s about longevity and performance. Using the correct materials, proper piling depth, and professional-grade roof systems ensures your structure can withstand years of exposure to water, sun, and storms.
Cheaper builds often lead to higher maintenance costs or structural issues over time. Working with experienced marine contractors helps you achieve both durability and long-term value, protecting your waterfront investment for decades.
Get Expert Help Building Your Boathouse
Designing and building a boathouse is a complex process that blends engineering, craftsmanship, and local environmental knowledge. At Lamulle Construction, we specialize in marine construction and custom boathouses that enhance both property value and lifestyle.
Our team provides tailored designs, durable materials, and expert installation, whether you need a simple single-slip structure or a large-scale covered deck with integrated lifts.
Ready to build your dream boathouse?
Contact Lamulle Construction today for a consultation or quote. Our experienced team serves homeowners across Louisiana and the Mississippi Gulf Coast, providing unmatched quality, reliability, and craftsmanship.
