Defining custom and semi-custom
The terms are used loosely in the industry — which creates confusion for first-time new build buyers. A clear definition: a fully custom superyacht is designed from first principles to the owner's brief. The naval architect creates a new hull form, the structural engineer designs a new structural scheme, and every dimension and system is specified to meet the specific requirements of the commission. No two fully custom yachts share a structural DNA.
A semi-custom superyacht is built on a yard's existing platform — a proven hull form and structural design that has been used for multiple vessels. The naval architecture, structural engineering, and major mechanical systems are defined by the platform. The buyer customises within the platform's parameters: interior layout, exterior styling, finish specification, and some systems choices. The hull form is fixed. Amels' Limited Editions series (the 180, 188, 212, and 242) are the clearest examples — each LE number refers to an LOA in feet, and multiple vessels have been built on each hull.
Between fully custom and platform semi-custom sits a grey area: yards like Heesen that offer "in-stock" hulls at various stages of completion, which can be customised more extensively than a fixed platform but less extensively than a true custom build. These are sometimes marketed as "custom" but are more accurately described as highly-customised semi-custom.
Cost comparison
Semi-custom builds typically cost 15–30% less than an equivalent fully custom vessel from a comparable yard. The source of the saving is specific: the naval architecture is done, the structural engineering is proven, the build process has no learning curve for the yard, and the risk of cost overruns — endemic to genuinely novel engineering — is substantially lower.
The saving is real but bounded. The semi-custom buyer still commissions a significant customisation programme — a full interior, exterior styling, systems integration, and all the project management that entails. A 25% saving on a €40 million yacht is €10 million — meaningful, but not transformative.
| Size | Custom (top tier) | Semi-custom (top platform) | Saving |
|---|---|---|---|
| 50m | €30–45M | €22–32M | ~25% |
| 65m | €55–75M | €40–55M | ~20–25% |
| 80m | €90–130M | €65–90M | ~20–30% |
Timeline and delivery
The timeline difference is where semi-custom most clearly outperforms. A fully custom build at a top-tier yard takes 3–5 years from contract to delivery. An Amels Limited Editions vessel delivers in 18–30 months. A Heesen in-stock hull with an existing steel section can deliver in 12–18 months from contract if the customisation scope is managed.
For buyers with a specific event or lifestyle requirement — a circumnavigation starting in 18 months, a family commitment that requires a vessel by a specific date — the timeline difference may make semi-custom the only viable option. For buyers with flexibility on timing and specific requirements that exceed what any platform can offer, the custom route is the right one. See our superyacht build timeline guide for the full stage-by-stage breakdown.
Design flexibility
The most common misconception about semi-custom is that it produces generic-looking yachts. This is not accurate. The hull form and structural envelope are fixed, but the exterior design, superstructure styling, interior layout within the structural envelope, and all finish work are fully customisable. Amels Limited Editions yachts look very different from each other because the exterior and interior design programmes are genuinely open.
What semi-custom cannot accommodate: unusual beam or draft requirements, hull forms optimised for specific performance targets (ice-class, shallow-water access, extreme speed), or guest accommodation that requires structural changes to the platform's defined layout. For buyers whose requirements fit within the platform's parameters — and most do — the flexibility is sufficient.
Resale value
Semi-custom yachts have slightly lower resale values than fully custom equivalents — primarily because the platform is not unique and potential buyers can compare the vessel directly against sisterships. However, the absolute resale performance of leading semi-custom platforms (Amels LE, Heesen FDHF hulls) is strong, and the lower purchase price means the percentage-of-original-value retained is competitive.
The practical implication: if you buy a semi-custom vessel for €32 million and sell it five years later for €22 million, you have lost €10 million in nominal terms but retained 69% of purchase price — a reasonable outcome by superyacht standards. The equivalent custom vessel purchased for €42 million and sold for €28 million retains the same percentage but the absolute loss is larger. See our pricing signals page for current market context.
Which route is right for you?
Choose fully custom if: Your requirements genuinely exceed what any platform can offer. You have the time — a minimum of 3–4 years from contract to delivery. You have the project management bandwidth or a professional project manager to represent your interests through a complex multi-year build. You prioritise uniqueness and are prepared to pay for it.
Choose semi-custom if: Your requirements fit within the parameters of a leading platform. Your timeline is constrained. You want a more predictable build process with lower cost-overrun risk. You are a first-time buyer who values the reassurance of a proven vessel type. For further guidance on the full acquisition process — whether new build or brokerage — see our superyacht buyer's guide and the build process guide. The Amels Limited Editions range and Heesen's in-stock programme are the market's two most developed semi-custom options.