Actually I disagree that it is unlikely to get a signal throughout the household. Down here we have 19 inch Cotswold Stone Walls ( happy memories of BT trying to drill through it...) and my Netgear 384G blasts straight through that. If you do get probs with a chimney column or other local probs, then you can often fix this by moving the router just a few feet. A bit like a mob phone it can be annoying, but once you have the optimum spot, it ain't going to move again.
If you DO need to extend the range there are various extenders, access points etc. and you won't have any headaches there.
One point worth mentioning though. A lot (never seen one yet that hasn't!) of routers and similar need to be powered down and rebooted once in a while. If yours happens to be in the loft and if you have not RTFM, then you might end up with an inconvenient climb to get to it. Make sure that you configure access to your router via the browser and are able to reboot from there.
I would never go back to life without wireless.
good luck!