How to Verify a Monument Restoration Company Is Legit
headstone cleanning in California | headstone cleaning in Texas
I’ll never forget the first time I saw someone ruin a headstone, it was a humid Saturday morning at a small cemetary outside of Richmond, and a guy with a pressure washer was blasting away at a 1920s marble marker. He thought he was cleaning it. Within thirty seconds, the stone’s surface looked like sandpaper had chewed it up. The lettering, once crisp, was now a blurry mess. The owner of the plot had hired him off a Facebook ad. Took me three tries to explain why that stone would never look the same. The guy shrugged and said, ‘It’s just dirt.’ Never again would I trust a company without checking them first.
That day stuck with me. I’ve been volunteering in cemetery preservation for about twelve years now—amateur historian, they call me, but really I just love old stones and the stories they hold. Over the years, I’ve seen good restoration work and bad. Real bad. The kind that makes you want to cry. So when someone asks me how to verify a monument restoration company is legit, I don’t just give them a checklist. I tell them what I’ve learned the hard way. Let me walk you through it.
Start with Their Credentials—But Don’t Stop There
A legit company should of insurance. General liability, at minimum. Ask for a certificate. If they hesitate, red flag. Also, ask if they’re bonded. That protects you if they damage something. But here’s the thing: credentials alone don’t tell you if they know stone. I once met a guy with all the right paperwork who used a wire brush on sandstone. Big mistake. So after insurance, ask for references—specifically from a cemetery you can visit. Call the cemetery office. Ask if the company has worked there before. Cemetery superintendents talk. They know who’s good and who’s a hack.
Check Their Cleaning Methods—No Shortcuts Allowed
This is where most people get fooled. A legit company will tell you they use a pH-neutral, non-ionic cleaner. D/2 Biological Solution is the gold standard. It’s what the National Park Service recommends for most stone. If they say they use bleach, or ‘a little muriatic acid’ for tough stains, run. Those chemicals eat into the stone’s surface and cause permanent damage. Same with pressure washing—even on granite, it can blast away lichen and leave pitting. A good company uses soft brushes (natural bristle, not wire), low-pressure water, and lots of patience. They should explain why they avoid harsh household chemicals. If they can’t, they don’t know what they’re doing.
Look at Their Past Work—In Person
Photos on a website can be faked. I’ve seen ‘before and after’ shots that were just different lighting. Go see their actual work. If they’ve cleaned a stone in a local cemetery, walk over and look at it up close. Run your hand over the surface. Does it feel rough or pitted? Are the edges of the lettering sharp or rounded? A good restoration should leave the stone looking clean but not new. It should still look old, just not dirty. If it looks like someone polished it with sandpaper, they used the wrong tools. Also, check the ground around the base. If there’s residue or staining, they might have let chemicals run off. That’s sloppy.
Ask About Their Training and Philosophy
A legit company will have some kind of training—maybe from the Association for Gravestone Studies, or a workshop with a conservator. They’ll talk about ‘doing no harm’ and ‘reversibility.’ That’s not just jargon; it’s a real conservation principle. If they say things like ‘we make it look like new’ or ‘we use our own secret formula,’ that’s a warning sign. Stone conservation is about preservation, not restoration to original shine. I once talked to a guy who said he ‘brought back the color’ of a marble stone by applying a sealant. Sealants trap moisture. That stone is now flaking apart. So ask: ‘What’s your philosophy on cleaning?’ If they don’t mention doing the least invasive thing first, keep looking.
Get a Written Estimate—And Read the Fine Print
Any reputable company will give you a detailed written estimate. It should list the cleaning products they’ll use, the tools, the number of visits, and what’s not included. Watch out for vague phrases like ‘general cleaning’ or ‘standard treatment.’ I’ve seen estimates that charged extra for ‘lichen removal’ as if that wasn’t part of cleaning. Also, ask about guarantees. Most legit companies won’t guarantee that the stone will stay clean forever—because that’s not realistic. But they should guarantee their workmanship for a reasonable period, like a year. If they damage the stone, they should fix it. If they won’t put that in writing, walk away.
Frequently Asked Questions
Q: How can I tell if a monument restoration company is using the right cleaning products without being a chemist?
A: Ask them directly what cleaner they use. If they say D/2 Biological Solution or a similiar pH-neutral non-ionic cleaner, that’s good. If they name a household product like bleach or an acid, that’s bad. You can also ask to see the product label. A legit company will show you.
Q: Should a monument restoration company be licensed or certified?
A: There’s no national license for stone restoration, but look for membership in the Association for Gravestone Studies or the American Institute for Conservation. Also check if they’re bonded and insured. Those are good signs they take the work seriously.
Q: What if a company says they need to repoint or reset the stone? Is that a red flag?
A: Not necessarily. Resetting a leaning stone or repointing a cracked base is sometimes needed. But ask why. A legit company will explain the structural issue, not just upsell. Get a second opinion if you’re unsure.
Q: How long should a proper headstone cleaning take?
A: Depends on the stone’s size and condition. A small granite marker might take an hour. A large marble obelisk with heavy biological growth could take a full day. If a company says they’ll be done in 20 minutes, they’re probably cutting corners.
Q: Can I trust a company that offers to clean the stone for free or a very low price?
A: Be very careful. Free or cheap often means they’re using pressure washers, bleach, or other damaging methods to do it fast. I’ve seen ‘free cleaning’ offers ruin more stones than I can count. Pay for quality. It’s cheaper than replacing a stone.