Yacht interior design: cabin layout, materials and joinery detailing

Interior design in a yacht starts from a constraint that doesn't exist in architecture: the hull is already defined. The beam at frame 7 is what it is. Headroom at the centerline is fixed by the deck camber. If the waterline sits too high, the portlights end up underwater.

This shapes everything about how interior design works on a boat.

Cabin layout

Layout design starts with the brief: how many berths, what kind of navigation station, galley configuration (U-shape, inline, L-shape), toilet compartment requirements. Then it moves to circulation — how does a person move from the companionway to the forward cabin without hitting anything?

On a 10-meter boat, every 50mm matters. Moving the nav station 200mm aft might be the difference between usable seating and a permanent bruise on your right hip.

I model the layout in 3D before producing any 2D drawings. The reason is headroom: a plan view won't show you that the forward berth has 1.4m clearance where the occupant sits up in the morning. Walking through the model at 1:1 scale catches these things before any cutting starts.

Material specification

Interior finishes on a boat have to survive an environment that interior designers on land don't deal with: salt air, condensation, constant movement, and UV exposure on any surface near a portlight. This limits material choices in ways that clients sometimes find surprising.

Solid hardwood panels look good in photos. They also expand and contract with humidity changes and can crack at joints if not specified correctly. Teak works well but is expensive and increasingly restricted. Engineered veneers over marine-ply substrate are the standard for production interiors precisely because they're dimensionally stable.

The specification document lists every surface finish, substrate type, adhesive specification, and edge treatment. It's not a mood board — it's a manufacturing instruction.

Choosing interior wood

Clients usually start this conversation with a species name — teak, walnut, oak — before we've talked about what the wood actually needs to survive. Species matters less than most people think. Cut, finish, and substrate matter more.

Teak is still the reference point for a reason: high natural oil content resists moisture and doesn't need much finishing to hold up in a humid cabin. It's also getting harder to source responsibly, and the price reflects that. Walnut and oak look striking in photos but need a proper marine finish and a stable substrate to avoid gapping at the joints — neither handles humidity swings the way teak does on its own.

The bigger decision is veneer versus solid. Solid wood expands and contracts with the season; on a boat that sits in a marina through summer and winter, that movement shows up as gaps at the joints within a year or two. Veneer over marine-grade ply moves far less, which is why it's the standard on production interiors — not because it's cheaper, though it usually is, but because it's dimensionally stable in conditions solid wood wasn't built for.

What I ask clients to decide first isn't the species. It's how much movement and maintenance they're willing to accept for the exact look they want. That answer narrows the wood list faster than any sample board does.

Joinery detailing

Joinery drawings are where design intent becomes something a shipwright can build from. A section drawing through a cabinet might show: substrate type and thickness, veneer species and cut direction, edge banding profile, hardware specification, clearances for movement, and how the unit connects to the hull.

The gap between a well-detailed joinery drawing and a vague "mahogany finish" note is measured in the quality of what gets built. Shipwrights are craftspeople, but they can't read minds. They build what they're told.

On production vessels, I deliver a complete joinery package: plan views, sections through every cabinet type, hardware schedule, and a finish matrix listing every surface in the interior with its specified treatment. This is what allows a builder to reproduce the design consistently across multiple hulls.