Hidden Problems in Antique Furniture—and How to Spot Them Before You Buy

Antique furniture rewards careful buyers and punishes hasty ones. The piece that looks solid in a dim antique shop can arrive home with woodworm, lead paint, or a frame that’s been repaired so many times it no longer holds weight reliably. None of these problems are necessarily dealbreakers—but all of them are easier to address before the piece comes through the door than after.

A thorough inspection takes about 15 minutes and requires no special tools beyond a flashlight, a firm hand, and a working nose. The Antique Furniture Dealers Association—LAPADA—identifies structural integrity, pest history, and finish composition as the three areas that most commonly conceal expensive problems in antique pieces.

Woodworm: Active vs. Inactive

Woodworm is the larval stage of the common furniture beetle. The larvae tunnel through wood for two to five years before emerging as adult beetles, leaving small round exit holes—typically 1 to 2mm in diameter—in the surface. The holes themselves aren’t the problem. An active infestation is.

The test: look beneath and behind the piece for fine pale dust—called frass—that resembles very fine sawdust. The British Pest Control Association notes that frass present below exit holes indicates active infestation. No frass, clean holes, and no live larvae visible in the holes means the infestation is old and inactive—the piece is safe.

Active woodworm should not come into the house. The beetles can spread to structural timber, flooring, and other furniture. Treatment involves insecticidal spray applied to all surfaces, allowed to penetrate for several weeks, before the piece is safe to bring inside. Professional treatment costs $100 to $300 depending on piece size.

Old, inactive woodworm doesn’t require treatment before bringing the piece in—but the holes reduce structural integrity in affected areas. Legs, joints, and frame sections with significant holing warrant a closer look at load-bearing capacity before the piece is used as intended.

Lead Paint: The Invisible Problem on Old Finishes

Paint applied before 1978 may contain lead. The EPA’s lead paint regulations set 1978 as the year residential lead paint was banned in the US. Any painted antique from before that year—which describes most genuinely old pieces—should be treated as potentially lead-containing until tested.

The risk isn’t the intact paint surface. It’s deteriorating paint—chalking, flaking, or peeling—that produces dust. Lead dust is the primary exposure pathway, particularly for children and pregnant women. A piece with stable, intact paint and no visible deterioration presents low risk. A piece with chipping paint or heavy surface wear is a different matter.

Lead paint test swabs are available at hardware stores for $10 to $30 per kit. They change color on contact with lead-containing paint. The EPA recommends that positive test results be followed by professional assessment before sanding, stripping, or disturbing the finish in any way. Encapsulating the paint with a sealing primer—rather than removing it—is often the safer and less expensive path.

Mold: What the Smell Reveals

Mold inside furniture is rarely visible from the outside. It grows on the back panels, the inside of drawers, the underside of seats, and inside upholstered frames—wherever moisture has been trapped and wood or fabric has stayed damp long enough.

The nose is the most reliable diagnostic tool here. Open drawers, open doors, lean in close to the back of the piece, and smell. A musty, earthy odor—distinct from the general old-wood smell of an antique—indicates mold. A flashlight aimed into corners and behind panels may reveal white or grey bloom on surfaces.

Surface mold on solid wood can often be cleaned with a solution of mild detergent and water, followed by thorough drying. Mold that has penetrated into porous wood or upholstery filling is harder to address. The EPA’s mold remediation guidance recommends professional assessment for mold covering more than 10 square feet—a threshold easily exceeded inside a large wardrobe or chest.

A piece with active mold should not come into a home with respiratory sensitivities, young children, or inadequate ventilation. Mold spores released during transport and setup can circulate through the house before anyone realizes the source.

Water Damage: What the Surface Shows

Water damage in antique furniture shows up in several ways. Dark tide marks on surfaces, lifting veneer at the corners or edges, warped drawer fronts that no longer align with their openings, and a soft, spongy feel to wood that should be solid are all signs of past moisture exposure.

The concern isn’t cosmetic. Water-damaged joints lose the adhesive that holds them together. The American Institute for Conservation notes that hide glue—used in most antique furniture—reactivates when wet and loses its bond as it dries. A piece that has been significantly wet may have multiple joints that appear solid but are no longer bonded. Sitting on a chair or loading a shelf that has failed joints in this way can produce a sudden collapse.

Test the joints before committing to a purchase. Apply firm lateral pressure to chair legs, tabletop edges, and case piece sides. Any movement beyond a very slight flex indicates a compromised joint. This isn’t always a dealbreaker—reglueing joints is a straightforward repair—but it’s a cost and a project to factor in.

Previous Repairs: What’s Been Done and How Well

Most antique furniture has been repaired at some point. The question isn’t whether it’s been repaired but how well—and whether the repair holds up to normal use.

Look for mismatched wood color at joints, obvious filler at splits or cracks, or hardware that doesn’t sit flush with the surrounding surface. Old repaired breaks in chair legs or stretchers are particularly worth examining. The Furniture Society notes that a break in a structural member that’s been rejoined with the wrong adhesive—particularly modern PVA glue used where hide glue was original—can be harder to re-repair than the original break.

Drawer runners are another common repair site. Original wooden runners wear down over decades of use. Look at the bottom of drawers and the corresponding surface inside the case. If the contact surfaces are deeply grooved or the drawer has been shimmed up with added material, the repair has a limited remaining lifespan.

Upholstered Pieces: What’s Inside Matters

Vintage upholstered pieces from before the 1980s may contain horsehair, cotton batting, or other natural fill materials that compress over time and harbor dust, allergens, and occasionally pests. The American Lung Association identifies dust mites in old upholstery as a significant indoor allergen source. A piece with original stuffing that’s 40 or 50 years old carries a meaningful allergen load regardless of how clean it looks from the outside.

Press the seat or back firmly. If it doesn’t spring back with any resilience, the fill has compressed beyond usefulness. If the fabric has been replaced but the fill beneath hasn’t, the piece may look refreshed but still carry the original material underneath.

Reupholstering an antique chair or sofa runs $400 to $1,500 depending on size and fabric choice—HomeAdvisor data. Factor that into the purchase price of any upholstered piece where the fill’s condition or origin is unknown.

Quick Inspection Reference

Bottom Line

The best antique furniture finds share one characteristic: the buyer looked carefully before committing. A flashlight aimed at the underside, a firm hand on the joints, a nose inside the drawers, and a lead test swab on any painted pre-1978 piece covers the most expensive problems before they come home. Active woodworm stays outside until treated. Mold in the frame needs assessment before it circulates through the house. Water-damaged joints need testing before the piece holds any weight. None of this takes long—and all of it costs far less than fixing the problem after the piece is already in the living room.