www.sharetobuy.com/
Assuming you have registered here.
The HA does affordability checks. These are quite stringent.
In 2016 I bought a 45% share in a property worth 222k. After two years I had a payrise, borrowed some money from family, and also the underwriter cocked up his checks (the HA had underquoted for the maintenance charge) so I staircased to 70% share. I think it is now worth 285k. I could afford 90% now but I need to build up my personal savings first.
Mine was a new build.
Pros- no work to be done, brand new white goods, Housing Association manages all repairs including boiler etc. (not sure how this works for houses)
Cons - Service charge (maintenance) started at 90, then 120, then 140, its now 180 a month. This is by far the biggest annoyance.
I am with a large social housing provider and the rent only goes up a fixed annual amount, near inflation.
Advice - check quality as some new builds are excellent (mine won new build of the year, I love it), some are shoddy
New builds tend to be under or over priced. Mine was under because they took so long to build them and didn't change the price! So in two years it went from 222k to 250k value.
Re. Staircasing you can buy a minimum of 10% more in the property at a time. The rent decreases proportionately. You can only staircase 3 times and when you get to 90% you have to go to 100% (not 95%).
Everytime you staircase you have to pay solicitor fees (approx 1.2k).
Some associations do a shared ownership plus scheme where you pay a fixed annual amount to buy 1% more a year (with no fees) up to 90%. It is a good scheme as the 1% is based on the properties original price but not many people do it.
Which brings me to the last point, if you want to staircase, do it as soon as you can afford to (e.g. with a payrise) so YOU benefit from the equity growth and not the association.