Also known as “Barn Funnel Weavers”, “Sink Spiders” and “Those Monster Hairy Spiders That Run Like The Wind”. The Backyard Arthropod Project has more.
The good news: they'll keep your house clear of pests, and it's also apparently hard to make them bite you, even if you try. Readers in the know can earn extra spouse credits with that bit of info, just take a quick look first and make sure it doesn't have 2 really big eyes (wolf spider - use a jar) or 6 eyes/3 eye pairs (brown recluse possible if you're east of the Rockies, danger).
Two things I found most interesting: (1) Tegenaria domestica are supposed to live in houses, and don't do well outside; and (2) The author's speculation that they may be speciating and evolving.
I suppose it is possible that they are evolving in responce to human activities. It's also possible that the spider was adapted to colonize arid micro-climates and was relatively rare until humans came along and started mass producing the habitat it had otherwise used for millenia.
For example, it might have been adapted to dry cave passages or cave shelters. There numerous examples of creatures especially evolved to live cave twilight zones. In a 'dead cave' where the water table has sunk below the level of the cave, many of these 'twilight zones' are hyper-arid - comparable to the Atacama in Chile. They also tend to have highly moderated climates that default to near the average temperature of the region yearround.
One reason I suspect that what we are seeing is just a formerly rare species that has proliferated into a suddenly widely available niche is that the brown recluses similarly loves dark extremely dry spaces. I just don't think human civilization in the new world has been widespread enough for long enough to even contemplate evolution as we normally think of it.
That said, I'm increasingly thinking that dogs, polar bears, and Darwin's famous finches are gradually providing proof that as much as we've come to understand the mechanics of Darwin's famous theory, we are still just beginning to touch what really makes it go. Our old definitions of speciation and evolution that depend on definitions like 'species' that seem about as applicable to the real world as the Bohr model of the atom. Yes, it tells us something, but reality it isn't.
Based on our experiences with having a home built for us, these guys (and the wolf spiders) move into the place while it's still under construction. The domestic fauna are partially in place before the den is ready for the humans.
To the extent I understand what's going on in genomics these days, it looks like there's (in computer science terms) both raw data and control logic in the genome, with both subject to the mutation mechanism. There can be whole chunks of 'fossil' data lying around (more or less degraded through the generations), suppressed by the regulatory mechanism, that can come back into expression based on random changes in the control logic. Producing an apparent step function in the phenotypes, rather than the gradual 'hill climb' that you'd expect if new functionality were being evolved de novo.