Hi Julia Atlanta,
The 'general' budget for your mortgage outgoing is around the 17% level of your take home pay - some years ago, this figure was around the 27% mark.
As others on the site have pointed out, I go along with the fact that some 'statistics' can be a load of tosh, so I always take quoted stats with a pinch of salt!!
It's very difficult to be accurate on these kind of things over a web forum and lifestyle aspects of others which can vary your budget quite considerably.
However, the above figures do 'seem' to be quite a bit 'off mark' for even the 'average salary' levels across all the regions of the UK. That said, first time buyers (domestic or foriegners coming into the UK) do make up a relatively small share of the market and so those figures may well cover the complete cross section of mortgage payers.
I suspect many first time buyers will see a significant increase in those figures for their own budget and salary income and costs levels for everyday life - I'd estimate at least double those figures?!
The trick is to look carefully at your financial situation, your lifestyle wants and needs, and balance them as best you can to keep all elements moving. As usual, that quite often means compromising on certain elements in order to keep things moving
Only you know the realistic levels of income you and your better half will get, and only you know how you want to run your lives with your kids etc, so take those as your benchmarks and try different scenarios out, a different/cheaper place to live, cutting back on A and B in order to achieve X and Y etc etc.
Stats wise, work out what %age of your income you are willing to divert to certain elements and vary those accordingly to certain requirements and then of course compare with what you get on the market (housing and services and goods !) to see where the best fit for you is.
PS dont forget those extra 'housing' costs - council tax, insurances, tv licenses, maintenence, repairs, emergency repairs, redecorating, kids needs, rates, utilities !!
Hope this helps a bit !
DtM! West London & Slough UK!