Ship Repair vs Dry Docking: Which Does Your Vessel Need?

You are two weeks from a charter deadline. Your work list is sitting in front of you. Do you chase a dry dock slot or look at an afloat option?

The choice between ship repair and dry docking is often made out of habit, not analysis. Most superintendents default to lifting the vessel because it feels safer. That instinct can cost you time and money on scopes that never needed it.

This guide gives you a clear decision framework. You will learn which jobs can be done afloat, which need a lift, and how to weigh cost, downtime and class rules before you commit.

Ship Repair vs Dry Docking: The Short Answer

Ship repair covers any maintenance work on a vessel, including jobs done afloat alongside a berth. Dry docking lifts the vessel clear of the water to give full access to the hull. The right choice depends on your scope, your survey calendar and how much downtime you can absorb.

Most operators have three real options: afloat repair at a wet berth, a slipway haul-out, or a graving or floating dry dock. Each suits a different kind of job.

Use the table below to see the trade-offs at a glance.

Factor	Afloat Ship Repair	Dry Docking / Slipway
Hull access below waterline	Limited (diver access only)	Full access to the entire hull
Typical project duration	Often shorter for topside scopes	Longer due to docking and undocking
Cost profile	Lower fixed costs, no lift fees	Higher fixed costs from dock occupancy
Class survey eligibility	Suits in-water surveys and topside work	Required for special surveys and major hull work
Best scope fit	Machinery, topside, deck, pipework	Hull repaint, tail shaft, rudder, sea valves

What Counts as Afloat Ship Repair?

Afloat ship repair is any work carried out while the vessel stays in the water, usually moored at a wet berth. A surprising amount of scope falls into this category.

Work you can typically complete afloat:

Topside steelwork and plating repairs
Main engine and generator overhauls
Pipework, valve and pump replacement
Ballast water treatment system installation
Electrical, electronics and bridge upgrades
Accommodation refits and deck equipment
Propeller polishing and in-water hull cleaning

Work that usually needs lifting:

Tail shaft withdrawal and bearing renewal
Rudder removal or pintle replacement
Full hull blasting and recoating
Sea valve renewal in most cases
Major shaft alignment work

A non-tidal wet berth changes the maths further. EAP’s 150m non-tidal berth in Chatham keeps water level constant, so contractors work continuous hours instead of scheduling around tides. That can shave days off a project.

When Dry Docking Is Non-Negotiable

Some jobs cannot be done in the water. Honesty here matters more than sales talk.

You need a dry dock or slipway when:

Class society rules require a docked special survey
You are doing full hull blasting and recoating
Tail shaft or rudder work is on the list
Multiple sea valves need renewing
Hull steel below the waterline is suspect

Commercial vessels run on a five-year class cycle with an intermediate survey in between. Class societies including Lloyd’s Register, DNV and Bureau Veritas now accept in-water surveys in place of the intermediate docking under set conditions. Vessel age, hull coating type and previous survey records all factor in.

Check the latest IACS Unified Requirements before assuming an in-water survey will be accepted on your vessel.

The Decision Framework: Six Questions Before You Book

Run your scope through these six questions before you commit to any yard. They will tell you which mode actually fits.

What is the real scope of work? List every job. If nothing sits below the waterline, you have an afloat candidate.
When is your next class survey due? If a special survey is within twelve months, plan the dry dock around it and bundle work.
What is your daily downtime cost? Add charter revenue, crew, fuel and standing costs. This is the number that matters.
How far is the nearest suitable dry dock? Repositioning fuel and crew days add up fast.
What is the dry dock lead time? Slots fill months in advance. An afloat berth can often take you sooner.
Can the work be staged? Afloat now, dry dock at the scheduled survey, is often the cheapest path.

If three or more answers point to afloat repair, get an afloat quote before booking a dock.

The Real Cost of Ship Repair vs Dry Docking

The yard quote is only part of the cost. Most operators underestimate the rest.

Dry docking carries fixed costs you cannot avoid. You pay for the docking and undocking operation, dock occupancy by the day, and queue time if the dock runs late. Repositioning the vessel adds fuel, crew and lost trading days.

Afloat ship repair removes the lift cost entirely. For scopes that do not need hull access, the saving is often larger than the headline rate difference suggests. A short hop to a UK wet berth beats a long passage to a continental dry dock for many UK operators.

Dry docking still wins on total cost when your work list combines hull and topside jobs. You are paying for the lift either way, so bundle everything.

Work the total cost of ownership, not the per-hour rate. That is where most decisions go wrong.

Where a Slipway Fits as a Third Option

Many operators forget the slipway sits between afloat repair and a full graving dock. It deserves a closer look.

A slipway lifts the vessel clear of the water using a cradle and winch system. Turnaround is faster than a graving dock, and fixed costs are usually lower. The trade-off is a size limit set by the cradle capacity.

EAP’s 400-tonne slipway in Ramsgate handles tugs, workboats, small ferries and similar commercial craft. It suits operators who need underwater access for prop work, sea valves or a hull repaint, but who would be over-served by a graving dock.

If your vessel is under 400 tonnes and the job is mainly underwater, the slipway is often your sweet spot.

Choosing a Yard That Offers Both

Most yards offer either afloat repair or dry docking, not both. They will steer you toward what they have. That is a problem when your scope falls between the two.

A yard with both options can give you a neutral recommendation. They do not lose if the answer is a lift. EAP runs afloat repair from a 150m non-tidal wet berth in Chatham and dry work from a 400-tonne slipway in Ramsgate. The technical team will tell you honestly which fits your job list.

Ask any yard these questions before signing:

Do you offer both afloat and lifted options?
What class society approvals do you hold?
What is your current berth and slot availability?
Who manages the project and reports on progress?
How do you source steel, paint and machinery parts?

You can read more about EAP’s afloat and slipway services on the main site, or speak directly to the technical team about a current scope.

Frequently Asked Questions

What is the difference between ship repair and dry docking?

Ship repair is a broad term covering any maintenance work on a vessel, including jobs done afloat. Dry docking specifically means lifting the vessel clear of the water to access the hull below the waterline. The right choice depends on scope and class survey timing.

Can a ship be repaired without dry docking?

Yes. Topside steelwork, machinery overhauls, pipework, electrical work, accommodation refits, deck equipment, propeller polishing and in-water hull cleaning can all be done afloat. Work that needs full hull access, such as tail shaft withdrawal or full hull recoating, still requires a dry dock or slipway.

How often does a commercial vessel need to be dry docked?

Most commercial vessels follow a five-year class cycle with an intermediate survey halfway through. Class societies including Lloyd’s Register, DNV and Bureau Veritas now accept in-water surveys in place of the intermediate docking under set conditions. Vessel age and hull coating type both factor in.

Is afloat repair cheaper than dry docking?

For scopes that do not need hull access, afloat repair is usually cheaper once you count repositioning fuel, crew days and lost charter revenue. Dry docking is often cheaper overall when your scope combines hull and topside work, because the lift cost is fixed either way.

What is a non-tidal wet berth?

A non-tidal wet berth keeps the water level constant, so contractors can work continuous hours without scheduling around tides. That removes lost working time and shortens many repair projects. EAP’s 150m non-tidal berth in Chatham gives this advantage for afloat ship repair.

Make the Decision That Fits the Job

Ship repair and dry docking are not interchangeable. Each suits a different scope, survey window and budget. The operators who get this right run the work list through a decision framework, not a habit.

If you have a scope on your desk and you are not sure which mode fits, EAP’s technical team will review it and tell you honestly. Afloat job, slipway job, or one for a graving dock, you will get a straight answer. Get in touch with the team to start the conversation.

What is driving your next maintenance decision: cost, downtime or survey timing?