When choosing your location it is really worth investing some time into the choice. Think about what life style you are looking for eg dont move 20 miles away if your social life, family friends etc are all where you are now. If you are looking for a slower pace of life then consider how rural you want to be its generally true that plots in more remote villages and locations will be cheaper but if you cant drive or think that as you get older you will have mobility problems then it could be an expensive saving.
(random image from Clip Art)
View your plot at different times of day and different weather conditions, look to see what way the sun rises and sets so you know where you cold spots and sun traps are.
Look at access to the site who will be responsible for road maintenance, will the road be adopted by the council?. Will there be street lighting, pavements and the like and when do they expect to finish the whole site if there is more than your plot?
None of the above are a deal breaker if you like the plot you just need to be aware of them. On our site we are building all the remaining 6 plots but that is not always the case so look at what has planning permission if you are looking at a multi plot sites and while you can resubmit planning for your own style choice it will give you some idea of what the planners are looking for and if someone else has already put in changes then again that will help you.
If you are looking at a single plot site its worth having a friendly chat with the neighbours as they can be your best friends or your biggest headache as far as the planning process goes.
Probably the last thing on your mind is resale after all you haven't even got any plans but it is essential to put this into the equation even if it is to be your forever home as you will be investing not only your heart and soul in the property but cold hard cash too and you need to know it is money well spent and will increase in value as the years go on and while this can never be guaranteed research now will give you the best chance.
It is worth spending time on this part of the process as you can alter your house if you get something wrong, change the kitchen in a few years time if it didn't work out but you cant change the location.