If your house is fairly modern, the internal skin will be thermalite blocks or something similar. They are usually incredibly soft, to the point where you can drill into them with wood bits (it'll dull them though). I'd first try some masonry bits and you probably won't even need to use hammer. IIRC the hole size for these is 10mm.I think i will get these. May need a new drill for them too!
If your house is older and they're bricks then yeah you might need a beefier drill/bits. I can vouch for the cheapo SDS Titan from screwfix, but it is huge and if you're only buying it for this it's probably a waste.
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