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.

Mauro Henrique discusses how he sees color, and shares some of his favorite colors to use for projects; Then, he updates a homeowner's office by painting over dated wood paneling with the perfect dark blue; Lee Gilliam discusses various shrub pruning tools; Nathan Gilbert heads to Portland, Oregon to help a homeowner build a sensory mud kitchen for her at-home daycare.

Lee Gilliam helps a homeowner clean up his backyard by removing a diseased tree and shows how to remove and maintain invasive plants; Mark McCullough discusses the function of chimney caps, options available, and how homeowners can know if they need to install one; Richard Trethewwey installs a toilet with a built-in bidet for a homeowner and shares the variety of options available.

The Ask This Old House team head to California to explore a variety of ways that homeowners can protect their houses against wildfires. Jenn Nawada learns about local flora and helps firescape a front yard, Tom Silva learns how to fire harden a home's exterior, and Richard Trethewey learns a unique weeding technique that helps to mitigate the risk of fire spreading.

Nathan Gilbert helps a homeowner add shade to a pool area using a shade sail and unique anchor points; Ask This Old House spotlights the brothers of Jordan's Legacy Landscaping, a fourth-generation landscaping company in the Atlanta area; Mark McCullough helps a landlord make a cost-effective repair to her tenant's concrete walkway.

Installing a shade-tolerant sod in a backyard; heat pumps; building a side table.

Retrofitting a radiant floor system; cable railing connections and maintenance; the updated USDA Plant Hardiness Zone Map.

Installing a rain barrel; installing a drain to divert water from a patio; the team shares new additions to their tool bags.

Improving a garden with a new shade pattern; Richard gives Kevin a tour of his new HVAC distribution and education center.

Mauro brightens a dark apartment using paint concentrations; Mark and Richard discuss what naturally causes wet basements and how to mitigate it; Tom and Kevin build a bat house.

Restoring a garden bed; a New Hampshire painter explains how she got into the trade; installing a bathroom fan in a house with bad wiring.

Installing a smart thermostat after finding a wiring issue; staining a deck to protect and maintain it; cleaning a bluestone patio.

IAQ testing; restoring a Victorian firebox; transitioning landscapes from spring to summer; organizing a tool storage cabinet.

The International Rose Test Garden; replacing damaged bathroom tiles; reviewing comments from viewers.