[ warning: bottomposting, in wanton disregard of the Cisco corporate standard, follows ]
~ > The better developers in the US have :structured wiring" ~ > upgrades or just toss it in. ~ > ~ > Maybe its me, but I never looked at wifi as a home networking ~ > solution. ~ > ~ ~ WiFi is a widely used solution here in the UK for retrofitting to ~ existing premises. As others have commented, structured wiring or any ~ other networking is virtually unknown in domestic buildings, unless ~ the purchaser pushes for it.
Frazer,
Assuming that your building has "unstructured" wiring - that is, POTS-grade copper pairs that are homerun to some central building wiring closet - and that it's feasible to put a POTS jack (and to deliver AC power to) each AP location, then you can use some kind of DSLAM / VDSL switch in that wiring closet, to deliver wired network service to your APs.
I've worked with a hotel here in the states to use such a scheme to hook up their APs, and it worked well. This was using (unbiased product mention here) Cisco's 2950 LRE switches,
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Have fun,
Aaron