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Season guide

This Old House: Season 20

26 episodes Premiered Sep 26, 1998 Updated Sep 26, 2026

The Watertown House; The Key West House

Previously on This Old House

Season 20 Lore Primer

Key plot threads, lore context, and character stakes you need to remember before diving into this season.

  • ⚡ Directly follows the overarching narrative developments of This Old House Season 19.
  • ⚡ Faction dynamics and core character alliances shift under escalating external stakes.
  • ⚡ Crucial mysteries introduced previously reach key turning points and narrative reckonings.
  • ⚡ Sets up serialized story arcs that build directly toward the climactic season finale.

Season overview

The Watertown House; The Key West House

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Season 20 Episodes

Episode Guide

🛡️ SPOILER SHIELD

Season 20 Progress Shield

Future titles & synopses blurred. Tap "Reveal" on any card to peek.
Binge Efficiency Engine

Season 20: Filler vs. Essential Canon

Filter episodes by narrative weight. Focus on essential mytharc and skip standalone side quests.

15%
85%
Mytharc (4): Crucial lore & season climaxes
Core (22): Character development & subplots
Side Quest (0): Standalone / filler
S20·E1 Mytharc

The Watertown House - 1

Sep 26, 1998

Our 20th year on public television began with the renovation of a circa 1886 Victorian with a large circa 1915 rear addition, in the Boston suburb of Watertown, Massachusetts. Esse

S20·E2 Core

The Watertown House - 2

Oct 3, 1998

Our host opens the show with a visit to the Watertown Arsenal, now decommissioned and slated for redevelopment into office space. The highlight of the property is the Italianate Co

S20·E3 Core

The Watertown House - 3

Oct 10, 1998

The crew begins to dismantle the grand oak staircase as the house's new floorplan comes into focus - seen in a vitural-reality walkthrough, it calls for removing all three staircas

S20·E4 Core

The Watertown House - 4

Oct 17, 1998

As a professionally installed scaffolding system rises up to the roof ridge, landscape archtect Clarissa Rowe walks around the lot, assessing problems - mostly an overabundance of

S20·E5 Core

The Watertown House - 5

Oct 24, 1998

The landscape work begins with landscaper Roger Cook and arborist Matt Foti marking trees slated for pruning or renoval and Matt's crew relieving the yard of some of its overgrown

S20·E6 Core

The Watertown House - 6

Oct 31, 1998

The team's work to complete the reframing of the second floor starts with the use of engineered lumber, which makes for wide clear spans in the new kitchen area. Landscape architec

S20·E7 Mytharc

The Watertown House - 7

Nov 7, 1998

The show opens with a walk along a newly restored natural corridor lining the banks of the Charles River in Watertown. The result of years of hard reclamation work by the Metropoli

S20·E8 Core

The Watertown House - 8

Nov 14, 1998

A Dig Safe representative is on site to explain the nonprofit organization's function: to notify all utilities of impending excavation so that they can mark buried lines. Out back,

S20·E9 Core

The Watertown House - 9

Nov 21, 1998

Entomologist and pest control contractor Steve Marken takes us on a termite-damage tour of the house, pointed out the conditions that led to the original infestation. Out back, Rog

S20·E10 Core

The Watertown House - 10

Nov 28, 1998

Roger Cook and Christian Bilodeau plant 30-foot evergreens as a screen in the backyard, using Christian's tree spade. Tom updates us on the project's progress: termite damage has n

S20·E11 Core

The Watertown House - 11

Dec 5, 1998

The This Old House team installs a zero-clearance fireplace with a handsome cast-iron firebox. Window rehabilitation specialist David Liberty shows us his method of refurbishing th

S20·E12 Core

The Watertown House - 12

Dec 12, 1998

A busy day on site: the back decking is coming along with a new undermount system. The insulation crew is hard at work inside spraying on foam insulation. Up top, Mark Schaub and h

S20·E13 Core

The Watertown House - 13

Dec 19, 1998

Exterior painting by Steve Kiernan and crew is underway out back, as is the erection of a white cedar combination fence and trellis along the driveway. In the kitchen, Fred Morgan

S20·E14 Core

The Watertown House - 14

Dec 26, 1998

The show opens with a plumbing and heating tour of the basement, with stops at: a pressure-reducing valve that steps down the incoming water pressure from 110 psi to a more useful

S20·E15 Core

The Watertown House - 15

Jan 2, 1999

A huge drywall goes in under the front lawn to handle water pumped out of the basement slump, and chimney specialist Mark Schaub and crew shows us the newly ""Rumfordized"" front p

S20·E16 Core

The Watertown House - 16

Jan 9, 1999

The This Old House team shop for lunch supplies at Eastern Lamejun Bakery, one of the oldest Middle Eastern grocery stores in the counrty. (The Watertown area is home to one of the

S20·E17 Core

The Watertown House - 17

Jan 16, 1999

Our host arrives on site to find the building's exterior nearly complete: the new paint scheme is on, the copper gutter system is complete, and Tommy and crew have finished the fro

S20·E18 Core

The Watertown House - 18

Jan 23, 1999

Our host arrives to find Roger Cook and crew installing sod on the front lawn, while inside painting contractor Steve Kiernan gives him a lesson on proper prep and priming in the m

S20·E19 Core

The Watertown House - 19

Jan 30, 1999

The final days of the Watertown project start with Richard Trethewey's tour of the completed kitchen, complete with stainless-steel cleanup sink, the completed baths, and the laund

S20·E20 Core

The Key West House - 1

Feb 6, 1999

Our host and master carpenter find paradise at the end of the famed U.S. Route 1 - Key West, Florida. Along the island's back streets they discover their latest renovation challeng

S20·E21 Core

The Key West House - 2

Feb 13, 1999

After catching the famous Mallory Square sunset the evening before, the This Old House team gets to work, first checking in with general contractor Roger Townsend to see the jobsit

S20·E22 Core

The Key West House - 3

Feb 20, 1999

The show opens at one of Key West's most popular destinations, Harry Truman's ""Little White House,"" where the President visited for many years after having originally been sent t

S20·E23 Core

The Key West House - 4

Feb 27, 1999

The show opens at Truman Annex, a planned community on land that was formerly Key West's naval station. Later in the show, we tour another planned community, the town of Celebratio

S20·E24 Core

The Key West House - 5

Mar 6, 1999

The show opens at Key West's biggest industries - cruise ships. The This Old House team takes a tour of Carnival's Ecstasy, in port for the day. Back at the house, a glazier cuts a

S20·E25 Mytharc

The Key West House - 6

Mar 13, 1999

Just as they're getting used to all the sunshine, the crew realizes it's almost time to wrap up the Key West project. The activity on site is intense. Window installer Charles Malt

S20·E26 Mytharc

The Key West House - 7

Mar 20, 1999

On our last day in Key West, viewers get a look at the new pool, its cleaning system and the heat pump that both heats and cools it. (Key Westers have to chill down their pools dur

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