I want to sell the house and move.
To get our house back to the standard it was when it bought it would cost us around £10k I reckon.
To be honest £10k to get a showhome finish sounds pretty reasonable to me, even £10k every 10 years. It's likely cheaper than moving and you'd probably have to spend the same or more refreshing older properties.
Our house is about 9 years old and looking tatty also but that is more about the fact we've got very limited time at home during the week due to commuting and a toddler wrecking the place. In terms of stuff that has deteriorated:
-Carpets are very worn in places (underlay showing through) and full of dirt thanks to our son. Need replacing I think but to be fair they were quite cheap carpets
-Valves have failed in 3 toilet cisterns meaning that it constantly trickles water, had 1 replaced but CBA to get the other two sorted yet
-After about 9 months we had a pipe pop apart above the ground floor ceiling which caused a major leak over the hall and lesser extent dining room (another factor why the hall carpet has seen better days)
-Fence panel has been replaced
-Few cosmetic cracks around edges
-Had to have a door shaved to stop it sticking when closing
-In the kitchen the fascia peeled off the side of the worksurface, luckily this was an edge that is largely obscured from view as it is right next to the fridge freezer. Also over the past year the edging round the kitchen sink has started to peel a bit (kind of like a loose thread on clothing)
When we get the time to do a good spring clean it actually scrubs up fairly well apart from the carpets so haven't really spent much money on it. Other than replacing those I don't think we'll do anything before selling it.
edit: should point out this isn't a Bellway home.