Seasons & episodes

Jenn works with a wetlands specialist; Ask This Old House profiles general contractor Zach Dettmore in a new segment; Ross discusses Indoor Air Quality testing; Mauro teaches a homeowner how to repaint an exterior, concrete foundation.

Mauro helps a homeowner upgrade a fireplace; Jenn introduces landscape contractor Lee Gilliam, and together they discuss different landscape tools and how to maintain them for Spring; Tom and Kevin Build a bathtub tray out of zebrawood.

Richard helps a homeowner replace a leaking gas oven; Jenn and Kevin discuss how to create a pollinator garden at home; in Future House, Ross learns how wireless electricity technology can be applied to electric vehicle chargers in future homes.

Ross helps a homeowner dealing with ice dams decide whether to insulate from his attic roof rafters or the attic floor; Richard shares tips on irrigation repairs; Mark expands a driveway by adding an asphalt parking spot.

Jenn helps a homeowner transform a small sun and shade backyard with a new garden; Tom explains the importance of gutter downspouts; Mark adds street visibility to a farm by remounting an original farm sign and engraving an 1800s granite post.

Jenn creates a thoughtful backyard entrance; Mark shares how to safely clean hardscaping on different types of common hardscape materials; Tom shows how to patch holes in wood floors caused by previously removed radiators.

Richard helps a homeowner dealing with cold bath water by installing a reserve tank to fill the bathtub fully with hot water; Mauro shares his favorite tips for cleaning up after painting projects; Tom and Kevin work together to build a set of cornhole boards and after, the Ask This Old House cast come together for a head-to-head cornhole tournament.

Richard troubleshoots why a homeowner's shower leaks when the tub is running and makes the necessary repairs, then in studio, Richard explains why it was a unique repair; Heath deep dives into different wire gauge sizes and the electrical load capabilities of each size; Mark helps a homeowner repair some loose flagstone steps in his entryway and in his basement.

Tom Silva is rarely stumped. But when a homeowner reached out about a missing hand-turned spindle in the staircase of her 1900s Queen Anne Rowhouse, Tom attempts to replicate the spiral-detailed spindles on his lathe. There, he turns straight grain fir balusters and troubleshoots a string technique to replicate the spiral detailing.

Heath helps a homeowner whose kitchen breaker trips when the basement humidifier is running by installing a new basement circuit; Tom showcases the importance of table saw safety by demonstrating safety techniques for the most common sources of table saw injuries; Richard helps a homeowner supplement their homes heating by installing a wood burning insert into their drafty fireplace.

Nathan mills a large piece of an old red oak tree. The team come together to see if they can guess each other's cards in a special Ask This Old House headband game; Tom and Nathan team up to build a bar top out of the milled piece of red oak.

Nathan Gilbert shares his own experience as a Boy Scout and introduces his niece's Girl Scout troop and the project they need help with; Tom Silva and Kevin O'Connor create a two-layered hexagonal herb planter for the garden; Jenn Nawada and Nathan pick up materials to build a garden bed and then team up to help the Girl Scout troop rebuild and replant their community garden beds.

Heath Eastman helps a homeowner install outdoor-grade remote-controlled patio string lights over their backyard patio; Mauro Henrique color matches a homeowners retro aqua kitchen cabinet and repaints it to match the rest of the vintage kitchen; Mauro takes a sample of the aqua-colored kitchen cabinet and heads to Home Depot to demonstrate the color matching process.

Ask This Old House welcomes landscape contractor, Lee Gilliam to the cast and shines a spotlight on his 30 years of experience; Richard Trethewey helps a homeowner repair a leaking 3-valve shower while retaining the bathrooms original 1930's tile; Lee and Jenn Nawada work together to refresh a homeowner's eroding sloped yard; removing excess mulch, and installing boulders and ground cover plants.

Nathan Gilbert heads to Tulsa, Oklahoma to build a replacement utility cover. Ross Trethewey discusses low-level carbon monoxide exposure, symptoms, and differences in CO detectors and low-level monitors. Mark McCullough helps a homeowner clean out creosote build-up in their kitchen fireplace and explains the dangers of creosote build-up, options for removal, and the safety preparation involved.

Heath Eastman assists a homeowner who wants to hook up a generator to their home by installing a transfer switch to the circuit board; Environmental contractor, Ron Peik demystifies asbestos and shares options for mitigation; Mark McCullough fixes a faulty brick lintel repair on an 1833 home, discusses the difference between Flemish and American bond, and how to match existing mortar and joints.

Mauro Henrique shares the importance of prep work for any painting project, and why homeowners shouldn't skip it. Then, Mauro and Kevin O'Connor team up to refinish an antique outdoor bench with a whitewash stain; With a glass expert's help, Tom Silva learns how double pane glass is made while helping a homeowner repair a broken window.

Jenn Nawada teams up with a water conservation expert in Portland, Oregon to help two homeowners install a rain garden; Ross Trethewey shares how moisture meters can detect unseen water damage; Mark McCullough helps a homeowner increase the safety of their concrete steps by installing a wrought iron railing and showcases how railings are made at an iron fabrication facility.

Lee Gilliam shares the key tools and products to include in a winter weather kit to prepare for winter; Mark McCullough shares his favorite homeowner-friendly masonry tools and how to use them for entry level projects; Tom Silva and Kevin O'Connor upgrade the workspace by building a new mobile miter saw station, featuring two work benches and cabinets for extra storage.

Heath Eastman shares what factors to consider when selecting a generator, such as fuel or electrical load, and the options that are available; Jenn Nawada shares how to build a worm farm, what foods to incorporate and exclude when feeding the worms, and the many benefits of worm composted soil; Mauro Henrique refreshes a homeowner's vintage front door with a fresh coat of paint.

Nathan Gilbert helps a homeowner create a backyard entrance by converting a window into a backdoor; The team discusses what they look for in houses for sale that could be considered deal breakers for homeowners not looking to undertake major repairs or renovations.

Nathan Gilbert shares his love of flea markets, what items he's found, and what he recommends looking for; Mauro Henrique teaches a homeowner how to paint over old garage graffiti and which primer is right for the job; Ross Trethewey shares how radon tests can detect harmful levels of radon in homes; Nathan helps a homeowner ready her nursery for a second baby by installing closet shelving.

Richard Trethewey helps a homeowner troubleshoot why her upstairs shower runs out of hot water so quickly and helps her install a heat pump water heater; Kevin O'Connor returns to maker Jimmy DiResta's workshop in Upstate New York to get a lesson in leatherworking as they hand stitch a leather tote bag.

Heath Eastman shares his tips and tools homeowners can use to identify and label home circuit breakers; Tom Silva discusses his hobby of lathe turning, why he enjoys it, and shares some of his favorite pieces he's created. Then, in Build It, he shows how to turn a segmented bowl, which is comprised of multiple pieces of wood glued together and turned, creating a unique visual effect.