Hi Karin,
Lets assume over the next 0-3 years or so the housing market doesnt 'generally' increase or decrease and stays pretty much static. I'd say if you bought a new build now, then in 2-3 years when you sell, it's likely you couldn't value it £10K more than what you paid for it. Other apartments will be sold pretty much at what they were bought at at this time so buyers will naturally go for that one over yours.
However, seeing as nothing is as clear cut when it comes to property - if you were to 'tastefully' update your apartment, say with better kitchen worktops, put in a surround sound system, put in higher quality fixtures and fittings, newer style lights etc etc, then it would increase the 'desirability' of your property and you could ask for a few grand more on top of the price you paid. Hopefully, a potential buyer will bite and be willing to pay your slightly inflated price.
If the market does indeed continue to rise - then say your place was worth 20K more than what you paid for it, and you updated the property, again you could ask that 2-3K on top to cover (or go part way in covering) the time/money you spent on maintaining the place - and even then, you could push the potential out and ask for 5K more or something. Again, hopefully someone will bite when it comes to purchase time.
If the market does go down, then from the value of the property loss, you'll have to take the costs of maintaining the property and use it as more of a selling point to a buyer, but be careful of asking too much as they'll simply go onto the next apartment that's still bog standard.
for the above reasons, I think nowadays buyers shouldn't really be looking to 'gain' out of the properties they buy, although it still is, I can't see values 'continuing' to just keep on rising, even if it is slowly - however stranger things have happened and you just never know!
Please keep a 'get out strategy' if you can - It's what I always would say when talking to clients/our software users on the phone about their money, investments etc. Have you got enough of a backup in case the market does reverse? The slump in the US housing market is directly attributed to the Ease of borrowing money for overpriced properties that happened from around 2000-2001 till now, those people are finding it so hard to keep up with the cost of living increases that have come along with market recovery that they've had to be reposessed. Steer clear of any stupid salary multiplier mortgages, and see if you can scrape up another 5% for the deposit. Also ensure you dont get overstretched on your monthly outgoings with a large proportion going to all the property costs.
I'd suggest searching out places that have already been refurbed that are cheaper, get a good quality inspection done and I reckon that'll save you tens of thousands on the price of a new build. I don't know what or how far out zone 4 and 6 are but I'd think maybe out west as far as Ealing, Wood green, Finchley? if so, there's LOTS of refurbed properties in these type of areas! maybe go check em out?
Cheers! DtM! West London & Slough UK!