Regrout or Retile? A 15-Minute Shower Test to Run Before You Pay for Either

Most calls about a shower start with the grout: it’s dark, it’s cracked, it won’t come clean. The real question underneath is whether that grout is the problem, or just the part of the problem you can see. New grout on a sound wall buys you years. New grout on a wall that’s wet behind the tile is money spent putting a nicer face on a leak.

Here’s the check we’d walk a neighbor through before they pay anyone for either job. It takes about 15 minutes and a screwdriver, a house key and a flashlight.

The short answer

Regrout when the tiles are tight and the wall behind them is dry. Retile when tiles are hollow or loose across more than a small patch, the wall flexes, or there’s any sign of water on the other side. Grout isn’t the waterproofing in a tiled shower. The membrane, backer board or mortar bed behind it is. So a regrout can make a shower look new without making it one bit drier.

The 15-minute test

1. Tap every tile with the handle of a screwdriver, starting with the bottom two rows and the inside corners, where water sits longest. A sound tile gives a sharp, solid tick. A hollow one gives a dull, papery click. Mark the hollow ones with painter’s tape so you can count them.
2. Push. With the flat of your hand, press hard on the wall near the floor and beside the valve. Any flex, give or crunch means the backing has softened. This is the most important of the five checks.
3. Look at the other side. Check the closet or room that backs the shower, the baseboard just outside the shower door, the ceiling under an upstairs bathroom and, if your house sits on a raised foundation like many older Pasadena homes, the crawlspace under the drain. You’re looking for stains, swollen trim, bubbling paint or a musty smell.
4. Scrape the grout with a house key. Staining and hairline cracks are normal aging. Grout that powders out or is missing in places still needs replacing, but on its own that’s a regrout problem, not a retile one.
5. Check the corners and the tub line. Where the wall meets the tub, the pan or another wall, the joint moves, so it should be flexible sealant, not grout. Cracked grout in those corners usually means someone grouted a joint that should have been caulked. We covered where sealant does and doesn’t belong in our post on caulking mistakes before the rains.

How to read what you found

• Nothing hollow, no flex, dry on the other side: regrout, and reseal the corners with a 100% silicone or sanitary sealant at the same time. The tile has years left.
• A few hollow tiles in an otherwise solid, dry wall: have those tiles removed and reset in fresh thinset, then regrout. That’s still a tile repair, not a remodel.
• Flex, a soft bottom row, or stains on the other side: stop. Regrouting won’t fix it. The wall has to be opened to see how far the water got, and the fix is usually new cement board, a waterproofing membrane and new tile. If framing has been wet for a long time, expect some dry rot repair before any tile goes back up, and some drywall patching on whatever wall backs the shower.

Our opinion: don’t tear out a sound mortar-bed shower

A lot of older houses here, from the 1920s bungalows to the post-war ranches we wrote about in our Hastings Ranch post, have showers built the old way: tile set into a thick bed of mortar over wire lath. Those walls are heavy and stiff, and when they’re dry they last a very long time.

If a mortar-bed shower passes the checks above, our advice is to keep it. Reset any loose tiles, regrout, recaulk the corners. Tearing out a sound mud-set wall is loud, dusty, expensive work to replace something that may well outlast whatever goes in its place. If it’s the color you’re tired of, a contrasting grout changes the look more than people expect, and smaller bathroom updates like fixtures and lighting do the rest. If you truly can’t stand the tile, that’s a style decision and a remodeling conversation, not a repair.

The exception runs the other way. Plenty of showers redone in the 1980s and ’90s used moisture-resistant drywall, often called greenboard, behind the tile. California’s residential code no longer allows it as backing where it will be directly exposed to water, and when it gets wet it goes soft. If the push test finds give in a shower from that era, we’d skip the regrout entirely and put the money toward doing the wall properly.

Permits, our minimum, and what it costs

Tiling is on the City of Pasadena’s list of work exempt from a building permit, grouped with painting, carpeting and “similar finish work.” A regrout falls squarely there. Replacing a shower pan, drain or valve is plumbing work and isn’t on that list, and opening walls to replace backing can raise the question too. The Pasadena Permit Center at City Hall, 100 N. Garfield Ave., can answer it for your address. If you’re in a landmark district, our Bungalow Heaven permits post covers the extra layer, though interior bathroom work usually isn’t what triggers it.

On price: national cost sites put a professional shower regrout at roughly $600 to $2,500 (Angi’s range, as reported by Bob Vila). That’s a market range, not our price, and we’re not going to throw out a retile number here, because it swings with the tile you pick and what turns up behind the wall.

What we can tell you is how we work: Handyman Connection of Pasadena has a $350 labor minimum per job. Regrouting a whole shower is generally a bigger job than that. Touching up a few grout lines is not, so if that’s all you need, it’s either a reasonable DIY weekend or something to bundle with other small fixes on one maintenance visit, like the punch list in our week-before-guests repair list.

If you’re doing it yourself

Regrouting a sound shower is a fair DIY job if you’re patient. A few things decide whether it lasts:

• Remove most of the joint depth, not just the surface. New grout skimmed over old grout tends to crack and pop out.
• Go slowly with an oscillating tool. One slip chips the glaze on a tile you can’t match. A carbide hand scraper is slower and safer on old tile.
• If you find hollow tiles once you start, stop and reset them before you grout.
• Caulk the corners and the tub line; don’t grout them.
• Respect the cure time on the product before anyone showers, and seal cement grout afterward if the manufacturer calls for it.

Grout pens recolor grout; they don’t fix grout that’s crumbling. And there are good reasons grout work goes wrong for first-timers worth reading before you start.

When to call

If the push test or the other-side check worried you, call before you buy grout. We’ll check the wall, tell you which of the three outcomes above you’re in, and if it’s a repair, do it under CSLB license #992200 (you can verify any contractor’s license with the CSLB). If the wall does have to come open, it’s also the easiest moment to add blocking for grab bars, one of the aging-in-place changes that’s far cheaper done now than later. Our aging-in-place service covers the rest.

Call (626) 744-0402 or request a free estimate. Handyman Connection of Pasadena, 110 S Rosemead Blvd, Pasadena, CA 91107.

Quick answers