Remortgage to Nationwide valuation?

Brighty

Hi guys

Am looking to remortgage to nationwide at the mo, all going well so far, affordability was passed to underwriters because of existing buy to let mortgage on another property, but that was passed ok, so am awaiting an appointment to submit the full application.

We currently owe 104k but have some recent inheritance money i want to use to pay it down to get the 70%LTV rates, but that will depend on the valuation, if too low it will push us up into higher 75% rates or possibly 80%.

Have a question regarding remortgage valuations and how they are calculated. We paid 136k in May 2010 and i'm hoping it is now worth around that. The difficulty is that we are in a row of only 10 houses out in the sticks a bit, so difficult to get recent sales prices to compare, the last sale (other than one last month that isn't showing on nethouse prices yet) was our house at 136k in 2010 and before that our house again at 60k in 2001 and that's it.

So what would the nationwide valuer use to determine value in this case? Price index based on purchase price? But that obviously won't take into account the fact that we have put in new kitchen/bathroom/got rid of old granny cat pee carpet and lino and tiled/carpeted throughout/ tamed a very overgrown garden etc etc, none of which adds value as such but can't hurt.

Also according to the lloyds bank house price index calculator, our house has dropped 12.6% down to 118k since 2010, very upsetting if accurate, whereas the nationwide house price calculator says it has dropped 1.1% to 134.5k. Is there a definitive price index calculator by area?

Cheers

Brighty