Housewarming was the fifth story in the anthology Decalog 2: Lost Property. It was written by David A. McIntee. It featured Sarah Jane Smith, K9 Mark III and Mike Yates.
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- Sarah mentions a UNIT reunion party where she and Mike saw Brigadier Lethbridge-Stewart.
- Brendan Richards, the former ward of Sarah's aunt Lavinia Smith, is studying at the University of Cambridge.
- The country house where Sarah and Mike are staying is owned by the Doctor and is built over a time fissure.
- K9 destroys the Master's time vector filter.
- K9 claims that is shaped like a dog because "the human ego requires a familiar reference point to aid in adjusting to new concepts. Animal forms are comforting to the majority of humans."
- K9 runs on an electron-fusion nuclear battery.
- Though K9 usually recharges himself when necessary, Sarah Jane has occasionally done so by clipping jump leads to his antennae.
- David A. McIntee's description of Count Marius Castillo matches his description of the Master in PROSE: First Frontier.