I always find these things strange. An asking price is just that; what the seller hopes to get for the house, probably on a very good day. The true price is what a buyer is willing to pay, and that in turn depends on what other options the buyer has and what they will have to pay for one of those instead.
Near where I live is a mini-gated community consisting of not very large modern 3 bedroom, 3 storey essentially terraced houses built in a block and mostly having very small gardens built around 15 years ago. They do have high-quality kitchens. They were originally sold for around twice the price of a normal 3 bed semi with decent garage and garden in the vicinity. They have managed to maintain that price premium and I have never been able to understand why.
We've been settled for about 10 years now and last did serious house-hunting around 15 years ago. Then, we put in quite a lot of offers that were around 75% to 80% of the asking price. People laughed in our faces. However, afterwards we followed the houses on Rightmove, and there were at least six that didn't sell for more than a year after we had made our offer, and when they did they sold for less than we had offered. The one we are in we bought 10 years ago (so prices have moved since then). It was left empty when the sole occupant died, and stayed on the market for over 5 years because the children who inherited it vastly over-estimated its value. I think they had an original asking price of 450k. When we came along they were still asking 300k but we offered 250k with cash in hand and they gave in and did the deal.
I'm sure its not always true, but there are plenty of both greedy and stupid sellers and estate agents out there. Don't let them take you for a ride.
So offer what you think the house is worth. They can only say no. Be prepared to be knocked back, but in the end there are lots of houses and it's your money.