Seamaster 840 Boat Cover Guide: Sizes, Materials & Prices

Introduction: Why Your Seamaster 840 Deserves a Bespoke Cover

Welcome, fellow Seamaster 840 owners, to your definitive guide for selecting the perfect boat cover! Your Seamaster 840, a cherished 28ft vessel with a generous 9ft 10in beam, is a familiar sight gracing the serene waters of the Thames, the picturesque Broads, and the historic Grand Union Canal. Such a distinctive and well-loved boat deserves nothing less than a cover meticulously crafted to its exact specifications. Here at UK Boat Covers, a family-run business based in Carterton, Oxfordshire, we understand the unique needs of your vessel. We specialise in bespoke solutions, ensuring unparalleled protection against the elements. A premium, tailor-made cover is not just an accessory; it's an essential investment in preserving your boat's condition and value for years to come. Our Seamaster 840 covers start from just £1,089 for robust PVC and £1,199 for high-quality Acrylic.

Why Choose a Bespoke Cover for the Seamaster 840?

The Seamaster 840's unique design, characterised by its specific hull shape, varied deck layout, and that substantial 9ft 10in beam, makes a truly bespoke boat cover an absolute necessity. Generic, off-the-shelf covers simply cannot accommodate these nuances, often resulting in a poor fit that flaps in the wind, collects water, or provides inadequate protection. Such ill-fitting covers not only look unsightly but can also cause damage through chafing and allow moisture ingress, fostering mildew. Our bespoke approach, perfected by Ryan and the team, ensures a glove-like fit that precisely follows every curve and contour of your 28ft vessel. Utilising our innovative postal copy service, we can replicate your existing cover, guaranteeing a perfect fit without you ever needing to bring your beloved Seamaster to our workshop.

See our Seamaster 840 model page for full specifications and cover options.

Cover Types Available for the Seamaster 840

For your Seamaster 840, we offer a versatile range of bespoke cover types, each designed to meet specific protection needs across the Thames, Broads, or Grand Union Canal. A full canopy cover provides comprehensive shelter for the entire cockpit, ideal for extended cruising or when moored, protecting against rain, UV, and debris. Tonneau covers are perfect for safeguarding the cockpit area when the boat is unattended or during transportation, offering a streamlined, secure fit. We also craft custom cockpit covers for quick, easy protection, and robust spray hoods to enhance comfort while underway. For comprehensive off-season protection, particularly when wintering on the canals, our heavy-duty winter covers are meticulously designed to shield your 28ft vessel from even the harshest UK weather, ensuring it remains pristine until the next season.

• Full Boat Canopy - Complete weather protection
• Tonneau Cover - Cockpit and deck coverage
• Cockpit Cover - Targeted cockpit protection
• Spray Hood - Windscreen and helm shield
• - Seasonal protection

Best Materials for Seamaster 840 Covers

Choosing the right material is crucial for your Seamaster 840 cover, and we primarily offer two exceptional options: robust PVC marine fabric and premium Acrylic fabric. PVC is a heavy-duty, highly waterproof choice, offering excellent durability and being incredibly easy to clean, making it ideal for the often-mucky conditions of inland waterways like the Thames and Broads, where bird droppings and tree sap are common. It's built for toughness and longevity. Acrylic, on the other hand, provides superior breathability, preventing condensation and mildew build-up, and boasts exceptional UV resistance, maintaining its colour and integrity over many years. While slightly higher in initial cost, its soft-touch finish and airy properties make it a favoured choice for those prioritising interior ventilation and a luxurious feel. Both materials are selected for their marine-grade quality and proven performance.

Compare materials in detail: Our fabrics page | Material comparison guide

Measuring Your Seamaster 840 for a New Cover

Accurate measurement is paramount for a perfect Seamaster 840 boat cover, especially with its distinctive 28ft length and 9ft 10in beam. While precise dimensions are helpful, measuring a boat can be tricky due to curves and protrusions. For the most accurate fit, we recommend measuring from bow to stern along the centreline, noting the widest point (the beam), and assessing the height from the sheer line over any cabin or windscreen. However, to entirely eliminate potential measuring errors and ensure a flawless, custom fit, our highly acclaimed postal copy service is the ultimate solution. By sending us your existing cover, even if it's torn, we can meticulously replicate its exact dimensions and contours, guaranteeing your new cover fits your Seamaster 840 like a second skin, precisely accounting for every unique feature.

Need help? See our size guide or use our postal copy service to skip measuring entirely.

Seamaster 840 Cover Prices

Investing in a bespoke Seamaster 840 cover from UK Boat Covers offers unparalleled value and protection. Our pricing structure is transparent and competitive, with robust PVC covers starting from £1,089 and premium Acrylic options from £1,199. The final price is influenced by the cover type, material choice, and any specific customisations required for your 28ft vessel. What truly sets us apart, and provides significant savings, is that as a family-run business, we operate without VAT. This means you save a considerable 20% compared to many competitors, effectively getting more for your money. While universal covers might seem cheaper initially, their poor fit often leads to premature wear, inadequate protection, and eventual replacement, making a bespoke, long-lasting cover from UK Boat Covers a far more economical and superior choice in the long run for your treasured Seamaster 840.

View full price list | Request a personalised quote

How to Fit a Cover on Your Seamaster 840

Properly fitting your new Seamaster 840 cover is crucial for its effectiveness and longevity. With the boat's 28ft length and specific cockpit layout, begin by identifying the bow and stern ends of the cover. Drape it loosely over your Seamaster, aligning the key features such as the windscreen position, grab rails, and any stern ladders. Work from bow to stern, carefully securing all straps and bungee cords, ensuring an even tension around the 9ft 10in beam. To prevent water pooling, which can be an issue on inland waterways, utilise any support poles or frames provided to create a gentle slope. Finally, ensure there’s adequate ventilation, perhaps by slightly loosening a strap in a sheltered area, to prevent condensation and mildew build-up beneath the cover, protecting your boat's interior.

Caring for Your Seamaster 840 Cover

To ensure your Seamaster 840's bespoke cover provides years of reliable protection on the Thames, Broads, or Grand Union Canal, regular maintenance is key. For general seasonal cleaning, simply use a soft brush and a mild, non-detergent soap solution to remove dirt, algae, and bird droppings that are common on inland waterways. Rinse thoroughly and allow it to air dry completely before folding. While our marine-grade fabrics are inherently UV resistant, periodic inspection for wear and tear, especially around stress points, is advisable. During winter storage, ensure the cover is clean and dry to prevent mildew. With proper care, a quality PVC cover can last 5-7 years, and an Acrylic cover often 8-10 years or more, making it a wise investment that genuinely maximises your boat's lifespan.

More tips: Cleaning guide |

Our Postal Copy Service for Seamaster 840 Owners

Our unique postal copy service offers Seamaster 840 owners across the UK an incredibly convenient and precise way to obtain a new bespoke boat cover, without ever needing to bring your 28ft vessel to us. The process is simple: you post your old Seamaster 840 cover, even if it's damaged, to our workshop in Carterton, Oxfordshire. Ryan and our skilled team then meticulously use your original cover as a template, accurately replicating every contour, seam, and fitting in brand-new, marine-grade PVC or Acrylic fabric. This ensures an absolutely perfect, tailored fit for your 9ft 10in beam and specific deck layout. Once copied, your new cover is dispatched within an impressive 6 working days, delivering bespoke quality and convenience right to your doorstep, saving you time and hassle.

1. Post your old cover to UK Boat Covers, Carterton, Oxfordshire
2. We create a perfect copy using your old cover as a template
3. Choose PVC or Acrylic marine-grade fabric
4. Receive within 6 days via tracked UK delivery

Learn more about our postal service