By MAURIPRO Rigging Specialists · Updated March 2026
Lewmar portlights represent the gold standard in marine glazing, combining decades of engineering expertise with innovative design to deliver exceptional durability and performance for serious sailors. These precision-manufactured portlights feature robust construction with marine-grade materials, advanced sealing systems, and sleek profiles that complement any vessel's aesthetic while withstanding the harshest marine environments.
MAURIPRO's comprehensive selection includes both the classic Atlantic series and the premium Flush Mitre collection, offering various sizes to meet your specific installation requirements. From compact Size 0 configurations perfect for smaller vessels to larger Size 60 portlights ideal for substantial cruising yachts, each unit delivers superior watertight integrity, UV resistance, and long-term reliability that experienced mariners demand.
How to Choose the Right Lewmar Portlights
Understanding Portlight Styles and Applications
Lewmar offers two distinct portlight styles in MAURIPRO's selection: Atlantic series and Flush Mitre series. Atlantic portlights feature a traditional raised profile design that provides excellent water drainage and structural strength for offshore sailing. These units maintain the classic boat appearance while offering reliable performance in challenging marine conditions. The Atlantic series uses a uniform 18cm height across all sizes, making them ideal for consistent sight lines along your vessel's cabin sides.
Flush Mitre portlights deliver a sleek, contemporary appearance that sits nearly flush with your boat's hull or cabin structure. This design minimizes wind resistance and provides a modern aesthetic preferred on racing yachts and contemporary cruisers. The Flush Mitre series offers variable dimensions, with heights ranging from 15.6cm to 17.1cm depending on the size, allowing for precise integration with your vessel's design lines.
Sizing and Cut-Out Requirements
Proper sizing selection depends on both aesthetic preferences and structural considerations of your installation area. Atlantic portlights range from Size 30 (38cm length) up to Size 60 (58cm length), all maintaining the standard 18cm height. The Size 30 models work well for smaller cabins and forward staterooms, while Size 40 and 60 options provide maximum light and visibility for main salons and aft cabins.
Flush Mitre portlights offer more varied proportions, with Size 0 being the most compact at 15.6 x 30.3cm cut-out, progressing through Size 5 at 24.4 x 42.9cm. When measuring your installation space, ensure adequate clearance around the cut-out dimensions for proper sealing and structural integrity. Consider the interior trim requirements, which typically add 2-3cm beyond the cut-out dimensions on all sides.
Frame Materials and Finish Options
The price variations within identical size categories reflect different frame materials and finishes available in Lewmar's portlight lines. Higher-priced units typically feature premium anodized aluminum or stainless steel frames that provide superior corrosion resistance and longevity in marine environments. These materials maintain their appearance longer and offer better thermal performance, reducing condensation issues in varying weather conditions.
Standard aluminum frames represent the mid-range option, providing excellent durability at more accessible pricing. When selecting frame materials, consider your vessel's existing hardware finishes and the exposure level of your installation location. Portlights facing prevailing weather directions benefit from premium materials, while protected installations may perform adequately with standard specifications.
Installation Location and Structural Considerations
Installation location significantly impacts your portlight selection requirements. Above-waterline installations offer more flexibility in size and style choices, while locations subject to green water or spray require more robust sealing systems. Atlantic series portlights excel in exposed locations due to their raised profile design that naturally sheds water away from sealing surfaces.
Consider the structural support available in your chosen installation area. Larger portlights like Size 60 Atlantic or Size 5 Flush Mitre models require substantial backing plates and proper load distribution. Smaller units (Size 30 Atlantic or Size 0-1 Flush Mitre) can often utilize existing structural elements with minimal reinforcement. Always verify that your hull or cabin wall thickness accommodates the portlight's frame depth requirements.
Budget Planning and Value Considerations
MAURIPRO's Lewmar portlight pricing ranges from $595 for entry-level Size 32 Atlantic units up to $1,270 for premium Size 5 Flush Mitre models. Best value options include the Size 30 Atlantic portlights starting at $598, offering substantial light admission and proven reliability for general cruising applications. Mid-range choices like Size 40 Atlantic units provide increased visibility while maintaining reasonable pricing.
When budgeting for multiple portlights, consider matching styles and finishes for visual consistency throughout your vessel. The slight premium for higher-specification frames often proves economical long-term through reduced maintenance requirements and extended service life in marine environments.
Brand Overview
| Brand | Models in Stock | Price Range |
|---|---|---|
| Lewmar | 14 models | $595–$1,270 |
Technical Decision Matrix
Compare key specifications across brands and models to find the right fit for your boat and sailing style.
Frequently Asked Questions
What's the difference between Lewmar Atlantic and Flush Mitre portlights?
Lewmar Atlantic portlights feature a traditional raised frame design that sits proud of the cabin surface, making them easier to install but more visible from the exterior. Flush Mitre portlights are designed to sit nearly flush with the cabin side for a sleek, modern appearance and better aerodynamics. The Flush Mitre series requires more precise cutouts and installation but offers superior aesthetics and reduced wind resistance. MAURIPRO stocks both styles in multiple sizes to suit different vessel types and owner preferences.
How do I determine the correct Lewmar portlight size for my boat?
Measure your existing portlight's cut-out dimensions carefully, as Lewmar sizes are based on the hole size needed in your cabin wall, not the overall portlight dimensions. For example, a Lewmar Atlantic Size 30 requires an 18 x 38 cm cutout, while a Size 60 needs 18 x 58 cm. If installing new portlights, consider both the structural limitations of your cabin wall and the desired interior light. MAURIPRO carries Lewmar portlights from Size 0 (15.6 x 30.3 cm cutout) up to Size 60, covering most recreational vessel applications.
Can Lewmar portlights be opened for ventilation?
Yes, most Lewmar portlights in MAURIPRO's inventory are opening models that provide excellent ventilation when needed. The Atlantic and Flush Mitre series both feature Lewmar's reliable opening mechanisms with secure latching systems. These portlights can be partially or fully opened to control airflow while maintaining weather protection. The robust construction ensures smooth operation even after years of marine exposure, making them ideal for cruising boats where natural ventilation is essential.
What's included with Lewmar portlights from MAURIPRO?
Each Lewmar portlight from MAURIPRO comes complete with the frame, opening sash, high-quality seals, and all necessary mounting hardware for installation. The units include Lewmar's proven rubber gasket system for watertight sealing and stainless steel or anodized aluminum construction depending on the model. Installation templates and comprehensive instructions are provided to ensure proper fitment. MAURIPRO stocks genuine Lewmar portlights with full manufacturer specifications and quality assurance.
Why do identical Lewmar portlight models have different prices at MAURIPRO?
The price variations you see for identical Lewmar portlight models typically reflect different frame materials, glass types, or regional manufacturing batches. Some units feature upgraded bronze frames versus standard aluminum, or may include tinted versus clear acrylic. Additionally, certain models may have enhanced UV coatings or different seal materials that affect pricing. MAURIPRO sources from multiple suppliers to maintain competitive pricing and stock availability, which can result in price differences for essentially the same portlight specification.
Shipping & Support
MAURIPRO offers free US shipping on orders over $99, a price-match guarantee on all lewmar portlights, and dedicated rigging experts available by phone or email. Contact our rigging team for personalized product recommendations.
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