New builds back on market

[StarlitTrees]

Over the last few years, lots of new estates have been build around our small town.
Something I've always wondered is why so many of them end up back on the market so quickly?

If I search for houses in our town, it's just full of houses that were built in the last year or two. Even before the estates have been finished, you see for sale signs up on previously sold homes.

Any ideas why this happens? Obviously some people's circumstances can change unexpectedly, but it's just the sheer number of houses that this happens with that has me wondering.

People buy them as lets and don't get any takers/too much hassle

People get them as a first home and realise they can't afford it?

Lots of reasons

Could it be the affordable housing thing? So many houses at a lower price so rich people swoop in quick and resell for 'normal price'. Or am I completely wrong about how affordable housing works?

A lot are bought on help to buy schemes so after 5 years you need to re mortgage for a higher amount. Could be people don't always realise the implications

I suspect that many are bought as investments. It's cheaper to buy off-plan, so an investor would buy a house, maybe let it or live in it for a while, then sell once the estate is complete and there's no disruption from building works to keep the price down.

Lots of people on our development bought them as first homes.

They’ve since gotten pregnant/had to move for work/other changes which have necessitated the sale.

Or it could be the fiasco that is parking round here