BWTS Installation Cost Breakdown (2026)
Updated
A BWTS installation cost breaks into four parts: equipment, engineering and class, yard labour and materials, and commissioning. Costs vary widely by ship size and system flow rate, so figures are indicative — a mid-size vessel retrofit commonly runs into several hundred thousand US dollars all-in, with equipment often the largest single share. New-build installation is cheaper per ship because the work is designed in rather than retrofitted.
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Key takeaways
- BWTS installation cost splits into equipment, engineering and class, yard labour and materials, and commissioning.
- Equipment is usually the largest single line and scales with the ship's ballast flow rate in m³/h.
- 3D scanning and thorough engineering add up-front cost but reliably reduce far larger yard rework costs.
- Engine-room congestion, hot-work, and tanker gas-freeing are the biggest yard-labour cost drivers.
- New-build installation is cheaper per ship because the system is designed in with no rework or downtime penalty.
- All figures are indicative and vary widely by ship size, technology, and yard; a firm price needs a survey.
What Are the Main Cost Components?
A BWTS project cost divides into four broad categories: the equipment package (filter, reactor or electrolyser, power supply, control system); engineering and class approval; yard labour and materials (steel, piping, cabling); and commissioning and handover. The relative shares shift with ship size and system type.
For most retrofits the equipment package is the single largest line, followed by yard labour. Engineering, class, and commissioning are smaller but essential — cutting corners there tends to inflate the yard cost through rework.
All figures here are indicative. Actual costs depend on flow rate, technology, yard location, and how congested the installation is, so a firm price comes only after survey and quotation.
How Much Does the Equipment Cost?
Equipment cost scales primarily with the ship's ballast flow rate in m³/h, because larger flows need larger filters, reactors, and power supplies. A small coaster and a large tanker can differ by an order of magnitude in equipment cost.
Technology also matters. UV systems carry a lamp and reactor cost that scales with flow; electrochlorination systems carry electrolyser and power-supply cost plus the neutralisation dosing skid. Explosion-proof versions for tankers cost more than standard versions.
Buying genuine, type-approved equipment matters beyond price: fitting non-approved components can undermine the type approval certificate at survey. The equipment cost should be weighed against lifetime consumables and service, not treated in isolation.
What Do Engineering and Class Cost?
Engineering covers the 3D scan, detailed design, fabrication drawings, and the submission package for class. This is a modest share of the total but has an outsized effect on the yard cost, because good engineering prevents on-site rework.
Classification society fees cover drawing approval and attendance. These are relatively predictable and set by the class society's schedule.
3D scanning adds cost up front but reliably reduces the far larger yard and rework cost, so it is generally money well spent on a congested retrofit.
What Drives Yard Labour Cost?
Yard labour covers steelwork for foundations, pipe spool fabrication and welding, cable pulling, equipment mounting, and testing. The cost depends heavily on the yard's day rate and the number of hours, which in turn depends on how much can be prefabricated ashore.
Congestion is the biggest cost driver in the engine room. Tight spaces slow every task and increase the risk of clashes that were not caught in engineering. Hot-work permits, staging, and gas-freeing on tankers add further hours.
Doing the work during an already-planned drydock spreads fixed docking costs across multiple jobs, whereas a dedicated repair-berth call carries its own mobilisation cost. The commercial trade-off between downtime and yard cost is ship-specific.
What Does Commissioning Cost?
Commissioning covers the manufacturer's or authorised engineer's function test, the MEPC.325(75) commissioning test with indicative biological sampling, crew training, and documentation for class and port state control.
Sampling and laboratory analysis carry their own cost. Sea Clean AS coordinates sampling with independent ISO 17025 laboratories; it is not itself an accredited lab, so the analysis cost is the laboratory's. Reagents, calibration standards, and commissioning spares are additional consumable costs.
Attendance cost depends on location and mobilisation. Sea Clean attends 0–24h in Norway and the North Sea region and by arrangement elsewhere, so a commissioning near a service base costs less to attend than one requiring long travel.
Retrofit vs New-Build Cost
New-build installation is cheaper per ship because the system is designed into the vessel from the start, with no rework, no congestion penalty, and no downtime to a trading ship. The equipment is still bought, but the labour and engineering penalty of retrofitting is avoided.
Retrofit cost carries the congestion, downtime, and rework risk that new builds avoid, which is why retrofit budgets should include a contingency for surprises found during fitting.
For an honest budget, treat equipment, engineering and class, yard labour, and commissioning as separate line items, add a contingency, and get a firm quotation after survey. Sea Clean can quote installation and commissioning support — contact post@seaclean.no with vessel particulars and intended model.
Frequently asked questions
How much does a BWTS installation cost in 2026?
It varies widely by ship size and system flow rate, so any figure is indicative. A mid-size vessel retrofit commonly runs into several hundred thousand US dollars all-in, with equipment often the largest single share. A firm price needs a survey and quotation.
Is the equipment or the installation more expensive?
For most retrofits the equipment package is the single largest line, followed by yard labour. Engineering, class, and commissioning are smaller shares but essential to keeping yard costs down.
Why is new-build BWTS cheaper than retrofit?
In a new build the system is designed into the ship from the start, avoiding the congestion penalty, rework risk, and trading downtime that drive up retrofit costs. The equipment is still purchased, but the labour and engineering penalty is far lower.
Does 3D scanning add to the cost?
It adds cost up front, but it reliably reduces the much larger yard and rework cost on a congested retrofit by catching clashes before steel is cut, so it is generally money well spent.
Sources
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