Custom design programme
When the standard range doesn’t fit. Bespoke EnviroCat designs for vessel configurations beyond EC16.5–EC34 — sized, configured, and engineered to the operator’s route, payload, and operating constraints.
[HERO IMAGE: open-water render or design-process imagery; suggests a study/design-program feel rather than a fixed vessel.]
[Primary CTA: Book a design-feasibility briefing]
When custom applies
The standard EnviroCat range — EC16.5, EC18, EC22, EC34 — covers most commercial passenger ferry, crew transfer, workboat, and emergency-services duty cycles in the 15-to-50-metre length envelope. Most operators are best served by selecting from the standard range and configuring propulsion, energy storage, and topside to their route.
Custom design programmes are scoped when one or more of the following applies:
- Length outside the standard range — vessels significantly above 34 metres up to the platform’s 50-metre upper envelope, or non-standard intermediate lengths driven by specific port, slip, or operational constraints.
- Payload or passenger capacity beyond standard fitout — high-density passenger configurations, vehicle-carrying capability, heavy cargo or equipment payloads.
- Specialised mission integration — research vessels, surveillance and security platforms, environmental-monitoring or hydrographic configurations, or other use cases not covered by the standard mission set.
- Specific propulsion architecture requirements — alternative propulsion suppliers, redundant drivetrain configurations, specific power-management architectures driven by operator standardisation or regulatory requirement.
- Specific classification or regulatory regime — flag, class society, or regulatory framework requirements that go beyond the standard DNV HSLC notation the platform is engineered to.
- Multi-vessel programme scope — fleet-renewal programmes where standardisation on a shared, custom-configured platform delivers more fleet-wide value than mixing standard models.
If none of these applies, the standard range is the right starting point. See EC16.5, EC18, EC22, and EC34.
What the Custom design programme delivers
A Custom programme is a design and engineering engagement that delivers:
- Feasibility study scoped against the operator’s route, duty cycle, and operating constraints — the same analytical engagement that anchors the standard-platform offering, applied at the design-programme scale.
- Complete vessel design and engineering package sized and configured to the agreed feasibility-study outputs. Construction drawings, classification documentation, BoM, reference General Arrangement, and supplier coordination — all the deliverables of a standard EnviroCat engineering package, scoped to the custom configuration.
- Foil-system configuration sized to the custom hull, with hull-foil interaction validated through CFD and tank-testing where the configuration departs significantly from validated standard-range geometry.
- Yard and supplier coordination for the build, in the same design-and-license model that applies to the standard platform.
The Custom programme is not a separate company offering; it is the standard platform offering scaled and configured to a non-standard vessel.
Process
A typical Custom programme runs in four phases:
- Feasibility briefing — initial conversation to scope route, payload, use case, and operating constraints. Determines whether a Custom programme is the right path or whether a standard-range vessel with topside customisation fits.
- Feasibility study — detailed analytical engagement, configuration optimisation, validation-scope estimate, design-programme cost and timeline estimate. Output: a feasibility memo that supports the operator’s go / no-go decision.
- Design programme — full design and engineering work, validation, classification documentation. Output: a complete engineering package ready for build at a partner yard.
- Build coordination — yard selection, supplier coordination, build supervision (optional), classification process. Output: a delivered vessel.
Phase 1 is at no cost. Phases 2–4 are commercial engagements scoped against the specific programme.
Examples of what Custom can look like
(Illustrative — not specific operator references.)
- A 42-metre fast passenger ferry for a long-distance Gulf inter-emirate route, designed for 250+ passenger capacity, foil-assisted electric drivetrain, multi-plug MCS charging to fit a tight port-time window.
- A 28-metre research platform built on the EnviroCat hull, configured with deck-area for towed-array survey equipment, hybrid propulsion for long endurance, and quiet-electric mode for sensitive-operations duty.
- A multi-vessel programme combining EC22-based passenger ferries with a 40-metre EC34-derivative flagship vessel, standardised on a shared propulsion and charging infrastructure, designed and delivered as a coordinated fleet-renewal package.
These illustrate the shape of Custom programmes. The actual scope depends entirely on the operator’s route and requirement.
Next step
Operators considering a vessel configuration outside the standard EnviroCat range should request a feasibility briefing. A 30-minute conversation establishes whether the requirement is best served by a Custom programme, a standard-range vessel with topside customisation, or a different approach entirely.
The briefing is at no cost and creates no commitment. The output is an honest answer: here is what fits, here is what doesn’t, here is what the next step looks like if we proceed.
[Book a design-feasibility briefing] [Contact Enviroinventions]