5 bed detached. We'd moved to this area from a more expensive one about 18 months before our first child was born and bought a house that was way bigger than we needed, but in an area we knew/liked, with the idea that we wouldn't have to move for quite a while. It stretched us a bit at the time, but we knew our salaries would be increasing annually for at least 5-6 years.
18 years later our house is more than big enough for our family of 5. It's worth more than double what we paid and we could afford a bigger house or more desirable location (though where we are lovely!), but we like having a relatively low mortgage and have been very happy here, so don't think we'll move until we downsize in retirement.