Season 21 - Ask This Old House Episodes

Season 21 of Ask This Old House brings back Kevin, Tommy, Richard, Jenn, and the crew, as they help homeowners tackle their most challenging home improvement projects.

S21 E26, Mauro Henrique, Tom Silva, and Jenn Nawada play the headband game

S21 E26: Sawmill, Bar Top

Nathan and Jenn brainstorm what to do with a fallen red oak tree; Nathan shows how to mill the tree; The team play a special Ask This Old House headband game; Finally, Tom and Nathan build a bar top.

S21 E25, Tom Silva demonstrates how table saw safety features work to Kevin O'Connor

S21 E25: Circuit, Table Saw, Fireplace Insert

Heath installs a new circuit for a breaker that trips when the dehumidifier is running; Tom demonstrates safety techniques for common table saw injuries; Richard installs a fireplace insert.

S21 E24, Tom Silva helps a homeowner missing original spiral detailed spindles from their staircase by hand-turning replicas on a lathe

S21 E24: Hand-Turned Spindle Replication

Tom helps a homeowner who's missing balusters from their Queen Anne Row staircase and heads to his workshop to replicate the spiral detailed spindles on his lathe. After, Tom installs the spindles.

S21 E23, Mark McCullough repairs a flagstone entryway

S21 E23: Flagstone Repairs, Tub Diverter

Richard troubleshoots a leaky shower and explains why it was a unique repair; Heath deep dives into wire gauges and the electrical load of each; Mark repairs a homeowner's flagstone entryway.

S21 E22, Tom Silva and Kevin O'Connor build a set of cornhole boards

S21 E22: Cold Water Bathtub, Cornhole

Richard installs a reserve tank to fill a bathtub with hot water; Mauro shares his tips for paint project clean-up; Tom and Kevin build a set of cornhole boards; The cast have a cornhole tournament.

S21 E21, Jenn Nawada plants a full sun garden

S21 E21: Full Sun Garden, Floor Patch

Jenn transforms a dried-out side yard into a full sun garden; Mark shares how to perform hardscape cleaning; Tom patches holes in a wood floor leftover from a previously removed radiator.

S21 E20, Jenn Nawada installs a sun and shade garden

S21 E20: Transition Garden, Granite Post

Jenn shares her love of hiking and how it inspires her landscape designs. Then, she installs a sun and shade garden; Tom explains gutter downspouts; Mark engraves an 1800s granite post.

S21 E19, Ross Trethewey runs tests to insulate an attic

S21 E19: Attic Insulation, Asphalt Parking Spot

Ross helps a homeowner with ice dams decide on how to insulate his attic; Richard shares how to do simple repairs for irrigation leaks; Mark expands a driveway by adding an asphalt parking spot.

S21 E18, Richard Trethewey and plumbing expert, Kelly Ireland install a vented microwave

S21 E18: Oven Ventilation, EV Charger

Richard travels to Philadelphia to install a new gas oven and vented microwave; Jenn and Kevin head to the garden center to talk pollinator plants; Ross learns about the future of solar EV chargers.

S21 E17, Tom Silva and Kevin O'Connor build a bath tub tray

S21 E17: Fireplace Painting, Bathtub Tray

Mauro helps a homeowner upgrade a fireplace by painting the brick; Jenn and landscape contractor Lee Gilliam discuss landscape tool maintenance; Tom and Kevin build a bathtub tray.

S21 E16, Jenn Nawada seeds in a wetland area

S21 E16: Wetlands, Foundation Painting

Jenn and a specialist discuss wetlands; Ask This Old House spotlights general contractor Zack Dettmore; Ross demonstrates how IAQ testing works; Mauro paints a concrete foundation.

S21 E15, Mark McCullough extends a pea gravel walkway

S21 E15: Shed Organization, Pea Stone Walkway

Nathan heads to Texas to help a mom organize her shed; Richard stresses the value of a furnace service call; Mark boosts confidence in homeowners; then, he installs a pea stone walkway.

S21 E14: Dimmer Switch Troubleshooting, Clothes Rack

Jenn shares why she loves bringing her dog to work; Heath helps a homeowner troubleshoot a strobing dimmer switch; Ross explains the benefits of smart bath ventilation; Tom builds a DIY clothes rack.

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S21 E13: Fire Pit, Window Restoration

Tom and a window restoration specialist repair an 1880s window; Mauro talks through different interior paint finishes and their uses; Jenn and Mark help a homeowner in Georgia install a firepit.

S21 E12: Neighbors Helping Neighbors

The Ask This Old House team partners with Rebuilding Together Boston to gather volunteers, repair a homeowner’s deck, construct a new patio, and install landscape lighting and plantings.

S21 E11: Babyproofing, Septic Systems

In this episode, the team helps a homeowner babyproof her home. Then, Jenn Nawada discusses maintenance for houseplants. Later, Richard Trethewey explains how septic systems work.

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S21 E10: Antique Pocket Door, Shaker End Table

In the episode, Nathan Gilbert helps a homeowner install an antique pocket door. Then, Ross Trethewey explains the technology of induction stovetops. Finally, Kevin O’Connor and maker Char Miller-King build a Shaker end table.

S21 E9: Install Cabinet Hardware, Breaker Trips

The team shares about jobs they might have chosen outside their trades; Mauro talks through what tools to use when removing wallpaper; Heath explains breaker trips; Nathan installs kitchen cabinet hardware.

S21 E8: Little Free Library

Kevin and Tom build a Little Free Library for an elementary school; Tom recruits his daughter, Kate, to paint it; Tom and Kevin then install the library with some help from the students.

S21 E7: Paint Tile, Water Tank Replacement

In this episode, Richard Trethewey replaces a hot water tank, and Heath Eastman shares safety tips for hanging electric holiday decorations. Later, Tom Silva explains how to repair woodpecker damage. Finally, Mauro Henrique helps a homeowner paint bathroom tile.