Boat Lift Bunks: The Right Fit Protects Your Hull.
Bunks carry your boat’s full weight on every cycle. A good fit spreads the load across the hull’s strong points. A poor one leaves pressure points, scuffs and a boat that leans. Here is what a good fit looks like and the eight signs it is time for service.
5.0- 35+ Years
- Licensed & Insured
- Lifetime Workmanship Guarantee
Recommended professional service
That mean stop and call
No universal bunk spacing
Every visit, for your warranty file
Written by Marc McGowan, owner of Boat Lift Installers. Two generations and 35+ years of combined experience installing, building and servicing boat lifts, docks and seawalls across South Florida. Updated September 2026.
Rated 5.0 On Google.
“Would recommend Boat Lift Installers LLC. 10/10 times. Very professional and knowledgeable with lots of experience in the boat lift industry. Recently had a 50,000 lb hurricane lift installed for a large center console and it has worked flawlessly. Mark and his team are punctual, precise, and always available to help and answer questions.”
“Marc and his team were communicative, professional, and informative throughout the whole process for my lift. The price was great, and the whole process was surprisingly seamless and stress free. I would recommend to anyone looking for a boat lift or dock.”
“Boat lift installers did a phenomenal job at a great and fair price. And delivered on all of their promises. Marc and crew are high quality , high integrity guys for sure”
“Marc and his team did a great job installing a 15KLB lift for me within the schedule I gave him and on budget. I'm very happy with the work they provided and would highly recommend if you're in the market for a new lift.”
“It is a pleasure to write this review. Marc is an excellent professional who is knowledgeable, dedicated, and highly focused. He is a pleasure to work with, and you will be very pleased with your decision to choose him and his company.”
“Marc came through with an excellent job on this lift. It’s hard to find a boss who works with his crew. Great service and quick install. Definitely will be dealing again in the future. Thanks guys.”
“Always ready / fast quote/ fast execution… I have good service with Mark, He do my maintenance periodically, I ‘m very happy with him!!”
“Marc always does a great job making sure my lift is at peak performance!”
“They did my lift in Ft. Lauderdale I wouldn’t recommend anyone else! Very respectful when I was asking him questions too!”
- Get professional service every six months, plus after storms, impacts or any change in how the boat sits.
- Bunks carry the boat. Guide poles only line it up and are not structural supports.
- There is no universal bunk spacing. Fit depends on the hull, loaded weight and the boat manufacturer's support points.
- New boat or major new equipment? Have the bunks refitted before you lift it.
Bunks Carry The Boat. Guide Poles Do Not.
Correctly fitted bunks spread the load across manufacturer-approved areas, keep the hull centered and stable, and protect the keel, chines, strakes, steps, running gear and finish from unintended contact.
The boat should settle evenly onto the bunks without resting on a guide pole, cradle beam, bracket edge, propeller, shaft, transducer, trim tab or other appendage. Guide poles help you line up. They are not built to carry the boat.
Safety First
Never enter or work beneath a raised boat. Do not loosen or adjust loaded bunk hardware. A qualified marine contractor must support the vessel before bunk repairs or repositioning.
What A Good Fit Looks Like.
The correct spacing, angle, length, height and number of supports depend on the exact hull, weight distribution, lift design and the boat manufacturer’s support requirements.
A Good Fit
Broad, even, centered support.
- Supports the hull at locations approved by the boat manufacturer
- Provides broad, even contact without isolated pressure points
- Keeps the vessel centered, stable and clear of lift structure
- Accounts for engine, fuel, batteries, water and equipment weight
A Poor Fit
What we correct on service calls.
- Places a bunk beneath a chine, strake, step, fitting or unsupported panel
- Leaves gaps or only short areas of hard contact
- Lets the hull lean, rock, slide or repeatedly land off center
- Forces part of the boat against a beam, bracket or guide pole
Outboard Weight Matters. So Does Every Upgrade.
Large outboards, full fuel tanks, batteries, towers and stored gear put substantial weight near the stern. Bunk length and position must support it without the transom or hull overhanging improperly. V-hulls, stepped hulls, catamarans and tritoons each need their own arrangement.
Sun, Salt And A Bad Landing.
South Florida saltwater, heat, sun, storms and year-round use accelerate bunk deterioration.
Material & Environment
What the climate does.
- Water intrusion, rot, splitting, warping or crushing of wood boards
- UV breakdown, tearing, thinning, detachment or hardening of carpet or padding
- Sand, shells, salt crystals or debris trapped against the hull
- Corrosion of brackets, bolts, fasteners, welds and cradle attachments
Fit & Operation
What the setup does.
- Incorrect spacing, angle, height, length or bracket position
- Boat repeatedly landing off center or striking the bunks while loading
- Overloading, uneven weight, shock loading, storm movement or a shifted cradle
- Changing boats without redesigning and testing the support arrangement
When The Boat Changes, The Bunks Change Too.
Confirm lift capacity covers the fully loaded operating weight, not just the published dry weight. Then have bunk spacing, angle, height, length, brackets, guides, balance and clearances professionally evaluated.
8 Signs Your Bunks Need Attention.
Stop and arrange a professional inspection if you see or hear any of these.
Boat leans or sits off center
The vessel settles to one side or needs repeated repositioning.
Uneven or incomplete contact
One bunk carries more load, or visible gaps and pressure points appear.
Cracked, soft, bowed or waterlogged boards
The support bends, compresses, splits or no longer holds its shape.
Torn, loose, thin or missing covering
Bare board, staples, fasteners or sharp edges may contact the hull.
Loose or corroded brackets and hardware
The bunk shifts, twists, rocks or changes angle under load.
New hull scuffs, dents or worn stripes
Damage lines match a bunk edge or isolated support point.
Contact with lift structure or equipment
The keel, hull, transducer, propeller, shaft or trim tab approaches a beam or bracket.
Movement after a storm or impact
Bunks, guides, cradle or boat position no longer match the previous setup.
Stop If The Boat Is Unstable.
Do not keep cycling a leaning, shifting or poorly supported vessel. Keep the area clear and arrange a professional inspection.
What Bunk Service Should Cover.
Boat Lift Installers LLC recommends professional service every six months. Heavy use, storms, salt exposure, a vessel change or visible movement may require earlier attention. See how our boat lift service and repair program works.
Inspection
Hull, bunks and clearances.
- Identify the vessel, loaded weight, hull type and the manufacturer’s support requirements
- Inspect boards or rails, covering, brackets, fasteners, welds, guides and cradle alignment
- Check full-length hull contact, spacing, angle, height, parallelism and stability
- Verify clearance from keel, chines, strakes, steps, running gear, fittings and lift structure
Correction & Test
Support first, then adjust.
- Safely support the vessel before loosening or replacing any loaded component
- Replace damaged materials and hardware; correct alignment and fit
- Run a controlled cycle and confirm smooth centering, even contact and clearances
- Document measurements, findings, parts, photos, work performed and follow-up needs
Keep A Documented Service History
Keep service dates, contractor information, vessel details, measurements, inspection findings, photos, invoices, parts replaced and recommendations. A documented history helps demonstrate required maintenance and can support factory and contractor installation warranties, subject to each warranty’s written terms.
Between professional visits
- Make a safe visual check before lifting and confirm the boat is centered and settling evenly
- Rinse accessible bunk surfaces and hardware with fresh water after salt exposure when appropriate
- Remove loose debris without going beneath the vessel or placing hands between hull and bunks
- Request an extra inspection after hurricanes, impacts, overloads, hull damage or any change in how the boat sits
Due for your six-month service? We document every visit for your warranty file.
“Marc always does a great job making sure my lift is at peak performance!”
Damon C. · Boat lift service customer
- 35+ years on South Florida water
- Licensed & insured
- Lifetime Workmanship Guarantee
Boat Lift Bunks: Common Questions
How far apart should boat lift bunks be?
There is no universal spacing. The correct spacing, angle, length and height depend on the hull design, loaded weight distribution, lift model and the boat manufacturer’s approved support points. We measure and fit bunks to the specific boat.
When should boat lift bunks be replaced?
Replace or rebuild bunks when boards are cracked, soft, bowed or waterlogged, when the covering is torn or thin enough to expose fasteners, or when the boat no longer sits evenly. New hull scuffs that match a bunk edge are another sign.
Do I need new bunks if I buy a new boat?
At minimum, the bunks usually need to be refitted. A setup that safely supports one boat may not support the next. Confirm the lift’s capacity covers the new boat’s fully loaded weight, then have spacing, angle, height and clearances evaluated.
Why does my boat sit crooked on the lift?
Uneven bunk contact, a shifted bracket, a damaged board, uneven cables or poor loading technique can all cause it. Stop cycling a leaning boat and have the support system inspected.
Can guide poles hold the boat in place?
No. Guide poles help you line up during entry. They are not designed to carry vessel weight, and the boat should never rest against them on the lift.
Related Owner Guides
Boat Lift Service & Repair
Six-month service and repairs, documented on every visit.
Learn More →
Boat Lift Cables
10 signs a cable needs attention and what service should cover.
Learn More →
Bunk Brackets
9 warning signs of shifted, corroded or damaged brackets.
Learn More →
Schedule Your Consultation
Takes about a minute. We reply with next steps.