Writing a Refit Specification for a Phinisi

Converting a working phinisi into a modern liveaboard succeeds or fails on the specification document — the system-by-system scope written before the first plank moves — because a refit without a spec is not a project, it is an open account with a yard. This article covers writing that specification for a cargo or tired-charter conversion: the structure, the system-by-system content, the contingency mathematics and the work sequencing that keeps the account closed.

From Donor Hull to Design Intent

A conversion spec starts with two documents that must exist before any scope is written: the donor hull’s survey (structural condition, fastening state, timber inventory — the honest baseline, obtained through the standard pre-purchase survey process) and a one-page design intent: who the finished vessel serves, how many guests, what standard, which waters. Every later line item traces to one of these two documents or gets deleted. The classic conversion failure is specifying a boutique-hotel interior onto a hull whose survey said “re-fasten first” — the beautiful cabins get torn out in year two to fix what the sequence skipped. Donor selection itself deserves the same rigour: strong candidates are overbuilt cargo hulls with sound frames and ugly everything else, and vetted examples are exactly what our refit candidates desk tracks.

The Spec Sheet, System by System

Write the specification in eight sections, each with drawings or definitions, materials, and acceptance criteria — the phrase “to a good standard” is banned from all of them:

Hull and structure. Everything the survey demanded: re-fastening schedules, frame sistering, caulking scope, new deck sections — with timber species and drying requirements stated.
Propulsion. Engine overhaul-or-replace decision with model numbers, shaft and propeller works, engine-bed condition.
Tankage and plumbing. Fuel, fresh water and black water capacities for the design occupancy; watermaker specification; every through-hull replaced or certified.
Electrical. Complete rewire to a documented loom on almost every conversion — legacy wiring is the fire statistic; generator sizing, battery banks, breaker map deliverable.
Interior. Cabin-by-cabin drawings, bathroom count against water budget, insulation and ventilation (the tropics forgive neither).
Deck and rig. Deckhouse changes (noting the tonnage consequences of enclosing space), rig repair or replacement, canvas.
Safety and compliance. Life-saving appliances for the design guest count, fire zones, the certificate list the finished vessel must pass.
Finishes. Where money famously disappears — specify materials and sample approvals, or the yard’s taste becomes your brand.

Contingency and Sequencing: The Arithmetic of Old Boats

Two numbers govern every conversion. Contingency: hold 25–40% above the quoted scope — not because yards deceive, but because opened-up boats reveal; the moment planking comes off, the hull renegotiates the plan. Spend contingency only on discoveries, never on upgrades, and the project survives its surprises. Sequence: structure first, systems second, interior last — money flows in that order or it flows twice. The disciplined sequence is: structural works and re-fastening; tanks and through-hulls while access exists; engine and shaft; wiring and plumbing while walls are open; insulation; then interior and finishes. Every sequencing shortcut sells the same lie — visible progress — and charges for it when finished joinery comes out to reach a pipe. Budget-wise, a sound donor plus disciplined conversion typically lands 40–60% below an equivalent new build, which is the entire economic case; the comparison numbers live in the refit-adjusted price bands, and the sea-trial verification of the finished work in our sea trial protocol.

Choosing the Refit Yard

The conversion yard need not be the build yard — and often should not be. Evaluate refit yards on three axes: covered slipway or hardstand big enough for the hull (weather-exposed refits stretch by the rain), systems trades in-house or reliably subcontracted (a brilliant timber yard with no electrician still leaves your rewire unmanaged), and a project ledger you can inspect weekly. Pricing follows the same discipline as the build side: itemized against your specification, never day-rate against optimism.

Frequently Asked Questions

How much contingency should a phinisi refit budget carry?

Twenty-five to forty percent above the quoted scope for a conversion of a working hull — spent only on genuine discoveries, never scope creep. Projects that open old planking with a 10% buffer do not finish under budget; they simply finish the buffer early and then improvise.

What order should conversion works run on an old phinisi?

Structure, systems, interior — strictly. Re-fastening and frames first, tanks and through-hulls while the boat is open, engine and wiring before walls close, insulation, then joinery and finishes last. Any sequence that shows cabins before the wiring is done will pay to remove those cabins.

Is converting a cargo phinisi less costly than building a new liveaboard?

Usually 40–60% less costly when the donor surveys sound — cargo hulls were overbuilt and their timber is often better than new supply. The economics invert on a weak donor: structural surprises consume the saving plank by plank, which is why the purchase survey, not the asking price, makes the decision.

How long does a full phinisi conversion refit take?

A disciplined cargo-to-liveaboard conversion runs 8–14 months in the yard: structural works first, then systems, then interior. Add the purchase and specification period ahead of it and plan 12–18 months from donor hull to first guest — still roughly half a new build’s calendar, which is the point.

Scoping a conversion? Get the spec written before the yard writes it for you: WhatsApp +62 811-3941-4563 or sales@komodoluxury.com.