Houses sold a year ago seem to have more extension potential though, and are not newly refurbished. I think I rather buy one that was not already extended to the max that I could make into what I want. Not sure I like the open flow of Kitchen at the front, study/office in the middle, and dining room/living room at the front.
The other houses has a third single bedroom on the first floor, they have converted this into a bathroom, so two bedrooms and two bathrooms on the first floor, and a loft with a raised roof, but NOT a dormer giving full height, and no ensuite. This seems a waste.
If I were to extend into the loft of a mid terrace, I would do a dormer with full ceiling height out back and a Juliette balcony, and include an ensuite bath/shower room, rather than just a slightly raised roof on a big room. It is not really a bedroom. It is more like a loft lounge without a view!
When I grew up in Putney the Dover House road area was all council houses, but I doubt there are even a handful left now. It's a nice enough area I suppose, but not really 'proper' Putney to my mind. That does seem to be a very high price though, I agree that you would be better off trying to get an un-extended property and doing it up yourselves if possible. Also, I'm not sure what your catchment for local schools would be there. Unless you are thinking private, in which case there are lots of good ones. I wish I could afford to live in Putney these days, the house I grew up in is now worth over 2 million!