How do you replace a pool liner?
You replace a liner in a set order: measure and order the right liner, drain the pool, remove the old liner, inspect and smooth the floor and walls, hang the new liner and vacuum it tight, then refill while cutting in the fittings, and finally balance the fresh water. Skipping or rushing any of the first three steps is where replacements go wrong, so treat the measuring and the shell prep as the real work and the hanging as the easy part.
This is a different job from a repair. If the liner has a small cut or a pinhole in otherwise sound vinyl, you do not replace it at all, you patch it with the pool still full. The liner patch guide covers that. You replace the whole liner when the vinyl has gone brittle and faded from years of sun, when it is tearing at seams and fittings, when it has stretched and slipped out of the track, or when staining and wrinkles have made it ugly beyond cleaning. If you found the failure with a leak search, the pool leak guide is usually what sends people here.
Plan it for warm, dry weather. Vinyl is stretchy and workable in the sun and stiff and unforgiving in the cold, so most liner swaps happen in late spring through summer. A new custom liner also takes weeks to manufacture after you order it, so measure early and line the work up for a stretch of good weather, not a surprise cold snap.
How do you measure and order the right liner?
Getting the measurement and the liner type right is the single thing that decides whether the job works, because a liner is cut to your exact pool and a wrong one does not stretch to fit. For an in-ground pool you order a custom liner made to the pool's length, width, wall height, and the shape of the deep-end hopper, plus any steps or benches. For a simple rectangle a careful owner can measure it; for a freeform shape, a vinyl-over-step, or a deep-end hopper, pay a pro to measure, because a liner ordered off a bad measurement usually cannot be returned.
Match the attachment type, not just the size. In-ground liners hook into a bead receiver track at the top of the wall, so you order the matching bead. Above-ground liners come in three styles and you have to order the one your pool uses: an overlap liner drapes over the top of the wall and is held by plastic coping clips, a beaded liner snaps up into a bead track, and a unibead or J-hook liner can do either. Pull a bit of your old liner out of the track before you order so you know exactly what you have.
Order a liner thickness that suits the pool. Residential liners are measured in gauge or mil, and a thicker liner costs more and resists punctures and UV better but is no more waterproof than a thin one. A heavier gauge is worth it on a pool that sees a lot of use or a lot of sun; a standard gauge is fine for a protected backyard pool. Whatever you pick, order it well ahead of the install day so it arrives in time to warm up in the sun before you hang it.
How do you drain the pool and remove the old liner safely?
Drain the pool completely with a submersible pump, but check the groundwater first, because an empty in-ground pool can float or heave out of the ground. A high water table pushing up under an empty shell is the real danger of draining, so open the hydrostatic relief plug in the main drain if the pool has one, and do not leave the pool sitting empty any longer than the job takes, especially with rain in the forecast. The draining guide walks through the hydrostatic risk in detail. An above-ground pool has no such risk; just pump it out.
With the water gone, unhook the old liner from the track and pull it out. On an in-ground pool the bead pops out of the receiver track around the top of the wall; on an above-ground pool you take off the top rails and caps or the coping clips first. The old liner is heavy and awkward, so cut it into manageable strips with a utility knife and haul it out in pieces.
Now do the step people skip and regret: inspect and smooth everything the new liner will sit against. Any bump, void, pebble, or washout telegraphs through the new vinyl and wears a hole from behind, so this is not optional. On an in-ground pool, check the floor base for erosion, low spots, and roots and trowel it smooth, patch rusted steel or rotted wall panels, and replace the foam cove at the base of the walls. On an above-ground pool, rake the sand base dead smooth, rebuild the cove where the floor meets the wall, pick out every stone and root, and lay a pool liner floor pad or protective underlayment over the base so grass and grit cannot push up through. A smooth, sound surface is what makes a liner last its full life.
How do you hang and fit the new liner without wrinkles?
Hang the new liner on a warm day so the vinyl is stretchy, line up the seams to the corners, and snap the bead into the track or clip the overlap over the wall all the way around. Center it before you commit the edges; a liner hung off-center leaves you short on one wall and pooling on the other. Work the material gently and let the warmth do the stretching rather than forcing a cold liner into place.
Pull the air out so it sets tight. The standard trick is a shop vacuum behind the liner: slip the hose through a skimmer opening, seal around it with tape, and run the vac so it sucks the air from between the liner and the wall. The liner draws tight against the walls and floor and conforms to the shape, and you smooth the last wrinkles toward the edges while the vacuum holds it. Get the wrinkles out now, because once water is on the liner you cannot move it.
Start filling with the vacuum still running, and cut in the fittings as the water reaches each one, not before. As the rising water weight pulls the liner into its final position, you find each skimmer, return, main drain, and light, screw the faceplate down over a fresh gasket to seal the liner against the fitting, and only then cut out the vinyl inside the ring. Cutting a fitting too early, before the water has seated the liner, leaves it stretched off-center and leaking at the flange. Once the pool is full, balance it like any new fill: follow the startup sequence and the water-balancing order to get alkalinity, pH, hardness, and chlorine right before anyone swims.
How much does it cost, how long does it take, and can you DIY it?
Cost splits sharply by pool type. A professional in-ground liner replacement runs roughly $1,500 to $4,500 or more, with the custom liner itself often $700 to $1,500 and the rest labor, disposal, and the water to refill. An above-ground liner is far cheaper, roughly $300 to $900 for the liner and basic accessories, and much of that range is doable yourself. Treat these as ballpark figures: pool size, liner gauge, how much floor or wall repair the shell needs, and local water prices all move the number.
On timing, the install is fast but the wait is not. A crew swaps an in-ground liner in about a day once the liner is on site, plus a day or more to fill, but the whole project runs weeks because the custom liner has to be manufactured after you order it. An above-ground liner is a weekend job with a couple of helpers.
Above-ground is a realistic do-it-yourself project; in-ground is harder but possible on a simple shape. The hard parts for a DIY in-ground swap are measuring a complex pool correctly, prepping a deep-end hopper, and getting the liner wrinkle-free with a vacuum, so a plain rectangle is within reach of a determined owner while a freeform pool with a deep end is a job for a pro. And if you are replacing a liner every few years, do the math the other way: the vinyl liner versus fiberglass comparison lays out when the recurring liner cost makes a no-liner shell the better long-term buy.
Frequently asked questions
How much does it cost to replace a pool liner?
A professional in-ground liner replacement runs roughly $1,500 to $4,500 or more, with the custom liner itself often $700 to $1,500 and the rest labor, disposal, and the water to refill. An above-ground liner is much cheaper, roughly $300 to $900 for the liner and basic accessories, and a lot of that is doable yourself. Pool size, liner gauge, and how much floor and wall repair the shell needs all move the price, so treat these as ballpark ranges.
How long does it take to replace a pool liner?
The hands-on install is about a day for an in-ground pool once the liner is on site, plus a day or more to refill. The reason the whole project takes weeks is that a custom in-ground liner is manufactured to your pool's measurements after you order it, so the lead time is in the waiting, not the labor. An above-ground liner is usually a weekend job with a couple of helpers.
Can you replace a pool liner yourself?
An above-ground liner is a realistic DIY job for a weekend with a couple of helpers. An in-ground liner is harder but possible on a simple rectangular pool; the parts that trip people up are measuring correctly, prepping a deep-end hopper, and getting the liner wrinkle-free with a vacuum. A freeform shape or a deep end is usually best left to a pro, and a measurement error on a custom liner is expensive because it generally cannot be returned.
How long does a pool liner last before it needs replacing?
Most vinyl liners last five to nine years before the vinyl fades, stretches out of the track, and goes brittle. Sun exposure, water chemistry left out of balance, and heavy use shorten that; a protected pool kept balanced reaches the top of the range. Replace the whole liner when it is brittle and faded, tearing at seams or fittings, or slipping out of the track. A single small cut or pinhole in otherwise sound vinyl gets patched, not replaced.
Can a vinyl pool liner be patched instead of replaced?
Yes, if the liner is otherwise sound. A clean cut or a small tear in good vinyl patches in minutes for the price of a kit and holds for years, with the pool still full of water, so there is no reason to replace a liner over one small hole. See the pool liner patch guide for how. Replacement is the answer only when the vinyl itself is at the end of its life: brittle, faded, tearing in several places, or no longer stretching into the track.